From a2bd5c77a86855ad9a141cba27729671f716bcfb Mon Sep 17 00:00:00 2001
From: Andrew Whitehead <cywolf@gmail.com>
Date: Tue, 19 Dec 2023 11:37:22 -0800
Subject: [PATCH 1/4] move to thread safe FFI errors

Signed-off-by: Andrew Whitehead <cywolf@gmail.com>
---
 src/ffi/error.rs       |  68 +++++++---
 src/ffi/key.rs         | 122 +++++++++---------
 src/ffi/log.rs         |  14 +--
 src/ffi/macros.rs      |   4 +-
 src/ffi/migration.rs   |  12 +-
 src/ffi/mod.rs         |   1 -
 src/ffi/result_list.rs |  58 +++++----
 src/ffi/store.rs       | 278 ++++++++++++++++++++---------------------
 8 files changed, 296 insertions(+), 261 deletions(-)

diff --git a/src/ffi/error.rs b/src/ffi/error.rs
index cf20bc8e..15a55c81 100644
--- a/src/ffi/error.rs
+++ b/src/ffi/error.rs
@@ -1,13 +1,37 @@
 use crate::error::{Error, ErrorKind};
 
+use std::collections::BTreeMap;
 use std::os::raw::c_char;
-use std::sync::RwLock;
+use std::sync::atomic::{AtomicI64, Ordering};
+use std::sync::Mutex;
+use std::time::{Duration, Instant};
 
 use ffi_support::rust_string_to_c;
-
 use once_cell::sync::Lazy;
 
-static LAST_ERROR: Lazy<RwLock<Option<Error>>> = Lazy::new(|| RwLock::new(None));
+struct StoredError {
+    error: Error,
+    time: Instant,
+}
+
+static ERRORS: Lazy<Mutex<BTreeMap<ErrorHandle, StoredError>>> =
+    Lazy::new(|| Mutex::new(BTreeMap::new()));
+
+static ERROR_INDEX: AtomicI64 = AtomicI64::new(1);
+
+#[repr(C)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct ErrorHandle(i64);
+
+impl ErrorHandle {
+    pub const OK: Self = Self(0);
+
+    pub fn next() -> Self {
+        Self(ERROR_INDEX.fetch_add(1, Ordering::Relaxed))
+    }
+}
+
+pub const ERROR_EXPIRY: Duration = Duration::from_secs(30);
 
 #[derive(Debug, PartialEq, Eq, Copy, Clone, Serialize)]
 #[repr(i64)]
@@ -50,37 +74,45 @@ impl<T> From<Result<T, Error>> for ErrorCode {
 }
 
 #[no_mangle]
-pub extern "C" fn askar_get_current_error(error_json_p: *mut *const c_char) -> ErrorCode {
-    trace!("askar_get_current_error");
+pub extern "C" fn askar_fetch_error(
+    handle: ErrorHandle,
+    error_json_p: *mut *const c_char,
+) -> ErrorCode {
+    trace!("askar_fetch_error");
 
-    let error = rust_string_to_c(get_current_error_json());
+    let error = rust_string_to_c(fetch_error_json(handle));
     unsafe { *error_json_p = error };
 
     ErrorCode::Success
 }
 
-pub fn get_current_error_json() -> String {
+pub fn fetch_error_json(handle: ErrorHandle) -> String {
     #[derive(Serialize)]
     struct ErrorJson {
         code: usize,
         message: String,
     }
 
-    if let Some(err) = Option::take(&mut *LAST_ERROR.write().unwrap()) {
-        let message = err.to_string();
-        let code = ErrorCode::from(err.kind()) as usize;
+    let mut errors = ERRORS.lock().unwrap();
+    if let Some(err) = errors.remove(&handle) {
+        let message = err.error.to_string();
+        let code = ErrorCode::from(err.error.kind()) as usize;
         serde_json::json!(&ErrorJson { code, message }).to_string()
     } else {
         r#"{"code":0,"message":null}"#.to_owned()
     }
 }
 
-pub fn set_last_error(error: Option<Error>) -> ErrorCode {
-    trace!("askar_set_last_error");
-    let code = match error.as_ref() {
-        Some(err) => err.kind.into(),
-        None => ErrorCode::Success,
-    };
-    *LAST_ERROR.write().unwrap() = error;
-    code
+pub fn store_error(error: Error) -> ErrorHandle {
+    trace!("askar_store_error");
+    let mut errors = ERRORS.lock().unwrap();
+    let time = Instant::now();
+    while let Some(entry) = errors.first_entry() {
+        if entry.get().time + ERROR_EXPIRY < time {
+            entry.remove();
+        }
+    }
+    let handle = ErrorHandle::next();
+    errors.insert(handle, StoredError { error, time });
+    handle
 }
diff --git a/src/ffi/key.rs b/src/ffi/key.rs
index 099570de..1305534d 100644
--- a/src/ffi/key.rs
+++ b/src/ffi/key.rs
@@ -3,9 +3,9 @@ use std::{os::raw::c_char, str::FromStr};
 use ffi_support::{rust_string_to_c, ByteBuffer, FfiStr};
 
 use super::{
+    error::ErrorHandle,
     handle::ArcHandle,
     secret::{EncryptedBuffer, SecretBuffer},
-    ErrorCode,
 };
 use crate::kms::{
     crypto_box, crypto_box_open, crypto_box_random_nonce, crypto_box_seal, crypto_box_seal_open,
@@ -25,7 +25,7 @@ pub extern "C" fn askar_key_generate(
     alg: FfiStr<'_>,
     ephemeral: i8,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let alg = alg.as_opt_str().unwrap_or_default();
         trace!("Generate key: {}", alg);
@@ -33,7 +33,7 @@ pub extern "C" fn askar_key_generate(
         let alg = KeyAlg::from_str(alg)?;
         let key = LocalKey::generate(alg, ephemeral != 0)?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -43,7 +43,7 @@ pub extern "C" fn askar_key_from_seed(
     seed: ByteBuffer,
     method: FfiStr<'_>,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let alg = alg.as_opt_str().unwrap_or_default();
         trace!("Create key from seed: {}", alg);
@@ -51,18 +51,18 @@ pub extern "C" fn askar_key_from_seed(
         let alg = KeyAlg::from_str(alg)?;
         let key = LocalKey::from_seed(alg, seed.as_slice(), method.as_opt_str())?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
-pub extern "C" fn askar_key_from_jwk(jwk: ByteBuffer, out: *mut LocalKeyHandle) -> ErrorCode {
+pub extern "C" fn askar_key_from_jwk(jwk: ByteBuffer, out: *mut LocalKeyHandle) -> ErrorHandle {
     catch_err! {
         trace!("Load key from JWK");
         check_useful_c_ptr!(out);
         let key = LocalKey::from_jwk_slice(jwk.as_slice())?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -71,7 +71,7 @@ pub extern "C" fn askar_key_from_public_bytes(
     alg: FfiStr<'_>,
     public: ByteBuffer,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let alg = alg.as_opt_str().unwrap_or_default();
         trace!("Load key from public: {}", alg);
@@ -79,7 +79,7 @@ pub extern "C" fn askar_key_from_public_bytes(
         let alg = KeyAlg::from_str(alg)?;
         let key = LocalKey::from_public_bytes(alg, public.as_slice())?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -87,14 +87,14 @@ pub extern "C" fn askar_key_from_public_bytes(
 pub extern "C" fn askar_key_get_public_bytes(
     handle: LocalKeyHandle,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Get key public bytes: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         let public = key.to_public_bytes()?;
         unsafe { *out = SecretBuffer::from_secret(public) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -103,7 +103,7 @@ pub extern "C" fn askar_key_from_secret_bytes(
     alg: FfiStr<'_>,
     secret: ByteBuffer,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let alg = alg.as_opt_str().unwrap_or_default();
         trace!("Load key from secret: {}", alg);
@@ -111,7 +111,7 @@ pub extern "C" fn askar_key_from_secret_bytes(
         let alg = KeyAlg::from_str(alg)?;
         let key = LocalKey::from_secret_bytes(alg, secret.as_slice())?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -119,14 +119,14 @@ pub extern "C" fn askar_key_from_secret_bytes(
 pub extern "C" fn askar_key_get_secret_bytes(
     handle: LocalKeyHandle,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Get key secret bytes: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         let public = key.to_secret_bytes()?;
         unsafe { *out = SecretBuffer::from_secret(public) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -135,7 +135,7 @@ pub extern "C" fn askar_key_convert(
     handle: LocalKeyHandle,
     alg: FfiStr<'_>,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let alg = alg.as_opt_str().unwrap_or_default();
         trace!("Convert key: {} to {}", handle, alg);
@@ -143,7 +143,7 @@ pub extern "C" fn askar_key_convert(
         let alg = KeyAlg::from_str(alg)?;
         let key = handle.load()?.convert_key(alg)?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -153,7 +153,7 @@ pub extern "C" fn askar_key_from_key_exchange(
     sk_handle: LocalKeyHandle,
     pk_handle: LocalKeyHandle,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let alg = alg.as_opt_str().unwrap_or_default();
         trace!("Key exchange: {}, {}, {}", alg, sk_handle, pk_handle);
@@ -163,7 +163,7 @@ pub extern "C" fn askar_key_from_key_exchange(
         let pk = pk_handle.load()?;
         let key = sk.to_key_exchange(alg, &pk)?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -176,24 +176,24 @@ pub extern "C" fn askar_key_free(handle: LocalKeyHandle) {
 pub extern "C" fn askar_key_get_algorithm(
     handle: LocalKeyHandle,
     out: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Get key algorithm: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         unsafe { *out = rust_string_to_c(key.algorithm().as_str()) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
-pub extern "C" fn askar_key_get_ephemeral(handle: LocalKeyHandle, out: *mut i8) -> ErrorCode {
+pub extern "C" fn askar_key_get_ephemeral(handle: LocalKeyHandle, out: *mut i8) -> ErrorHandle {
     catch_err! {
         trace!("Get key ephemeral: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         unsafe { *out = key.ephemeral as i8 };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -202,7 +202,7 @@ pub extern "C" fn askar_key_get_jwk_public(
     handle: LocalKeyHandle,
     alg: FfiStr<'_>,
     out: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Get key JWK public: {}", handle);
         check_useful_c_ptr!(out);
@@ -210,7 +210,7 @@ pub extern "C" fn askar_key_get_jwk_public(
         let alg = alg.as_opt_str().map(KeyAlg::from_str).transpose()?;
         let jwk = key.to_jwk_public(alg)?;
         unsafe { *out = rust_string_to_c(jwk) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -218,14 +218,14 @@ pub extern "C" fn askar_key_get_jwk_public(
 pub extern "C" fn askar_key_get_jwk_secret(
     handle: LocalKeyHandle,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Get key JWK secret: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         let jwk = key.to_jwk_secret()?;
         unsafe { *out = SecretBuffer::from_secret(jwk) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -234,7 +234,7 @@ pub extern "C" fn askar_key_get_jwk_thumbprint(
     handle: LocalKeyHandle,
     alg: FfiStr<'_>,
     out: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Get key JWK thumbprint: {}", handle);
         check_useful_c_ptr!(out);
@@ -242,7 +242,7 @@ pub extern "C" fn askar_key_get_jwk_thumbprint(
         let alg = alg.as_opt_str().map(KeyAlg::from_str).transpose()?;
         let thumb = key.to_jwk_thumbprint(alg)?;
         unsafe { *out = rust_string_to_c(thumb) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -250,14 +250,14 @@ pub extern "C" fn askar_key_get_jwk_thumbprint(
 pub extern "C" fn askar_key_aead_random_nonce(
     handle: LocalKeyHandle,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("AEAD create nonce: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         let nonce = key.aead_random_nonce()?;
         unsafe { *out = SecretBuffer::from_secret(nonce) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -265,7 +265,7 @@ pub extern "C" fn askar_key_aead_random_nonce(
 pub extern "C" fn askar_key_aead_get_params(
     handle: LocalKeyHandle,
     out: *mut AeadParams,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("AEAD get params: {}", handle);
         check_useful_c_ptr!(out);
@@ -275,7 +275,7 @@ pub extern "C" fn askar_key_aead_get_params(
             nonce_length: params.nonce_length as i32,
             tag_length: params.tag_length as i32
         } };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -284,7 +284,7 @@ pub extern "C" fn askar_key_aead_get_padding(
     handle: LocalKeyHandle,
     msg_len: i64,
     out: *mut i32,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("AEAD get padding: {}", handle);
         check_useful_c_ptr!(out);
@@ -294,7 +294,7 @@ pub extern "C" fn askar_key_aead_get_padding(
         let key = handle.load()?;
         let padding = key.aead_padding(msg_len as usize);
         unsafe { *out = padding as i32 };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -305,7 +305,7 @@ pub extern "C" fn askar_key_aead_encrypt(
     nonce: ByteBuffer,
     aad: ByteBuffer,
     out: *mut EncryptedBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("AEAD encrypt: {}", handle);
         check_useful_c_ptr!(out);
@@ -313,7 +313,7 @@ pub extern "C" fn askar_key_aead_encrypt(
         let enc = key.aead_encrypt(message.as_slice(), nonce.as_slice(), aad.as_slice())?;
         let result = EncryptedBuffer::from_encrypted(enc);
         unsafe { *out = result };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -325,14 +325,14 @@ pub extern "C" fn askar_key_aead_decrypt(
     tag: ByteBuffer,
     aad: ByteBuffer,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("AEAD decrypt: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         let dec = key.aead_decrypt((ciphertext.as_slice(), tag.as_slice()), nonce.as_slice(), aad.as_slice())?;
         unsafe { *out = SecretBuffer::from_secret(dec) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -342,14 +342,14 @@ pub extern "C" fn askar_key_sign_message(
     message: ByteBuffer,
     sig_type: FfiStr<'_>,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Sign message: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         let sig = key.sign_message(message.as_slice(), sig_type.as_opt_str())?;
         unsafe { *out = SecretBuffer::from_secret(sig) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -360,14 +360,14 @@ pub extern "C" fn askar_key_verify_signature(
     signature: ByteBuffer,
     sig_type: FfiStr<'_>,
     out: *mut i8,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Verify signature: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         let verify = key.verify_signature(message.as_slice(), signature.as_slice(), sig_type.as_opt_str())?;
         unsafe { *out = verify as i8 };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -377,7 +377,7 @@ pub extern "C" fn askar_key_wrap_key(
     other: LocalKeyHandle,
     nonce: ByteBuffer,
     out: *mut EncryptedBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Wrap key: {}", handle);
         check_useful_c_ptr!(out);
@@ -385,7 +385,7 @@ pub extern "C" fn askar_key_wrap_key(
         let other = other.load()?;
         let result = key.wrap_key(&other, nonce.as_slice())?;
         unsafe { *out = EncryptedBuffer::from_encrypted(result) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -397,7 +397,7 @@ pub extern "C" fn askar_key_unwrap_key(
     nonce: ByteBuffer,
     tag: ByteBuffer,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let alg = alg.as_opt_str().unwrap_or_default();
         trace!("Unwrap key: {}", handle);
@@ -406,18 +406,18 @@ pub extern "C" fn askar_key_unwrap_key(
         let alg = KeyAlg::from_str(alg)?;
         let result = key.unwrap_key(alg, (ciphertext.as_slice(), tag.as_slice()), nonce.as_slice())?;
         unsafe { *out = LocalKeyHandle::create(result) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
-pub extern "C" fn askar_key_crypto_box_random_nonce(out: *mut SecretBuffer) -> ErrorCode {
+pub extern "C" fn askar_key_crypto_box_random_nonce(out: *mut SecretBuffer) -> ErrorHandle {
     catch_err! {
         trace!("crypto box random nonce");
         check_useful_c_ptr!(out);
         let nonce = crypto_box_random_nonce()?;
         unsafe { *out = SecretBuffer::from_secret(&nonce[..]) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -428,7 +428,7 @@ pub extern "C" fn askar_key_crypto_box(
     message: ByteBuffer,
     nonce: ByteBuffer,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("crypto box: {}, {}", recip_key, sender_key);
         check_useful_c_ptr!(out);
@@ -441,7 +441,7 @@ pub extern "C" fn askar_key_crypto_box(
             nonce.as_slice()
         )?;
         unsafe { *out = SecretBuffer::from_secret(message) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -452,7 +452,7 @@ pub extern "C" fn askar_key_crypto_box_open(
     message: ByteBuffer,
     nonce: ByteBuffer,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("crypto box open: {}, {}", recip_key, sender_key);
         check_useful_c_ptr!(out);
@@ -465,7 +465,7 @@ pub extern "C" fn askar_key_crypto_box_open(
             nonce.as_slice()
         )?;
         unsafe { *out = SecretBuffer::from_secret(message) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -474,14 +474,14 @@ pub extern "C" fn askar_key_crypto_box_seal(
     handle: LocalKeyHandle,
     message: ByteBuffer,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("crypto box seal: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         let enc = crypto_box_seal(&key, message.as_slice())?;
         unsafe { *out = SecretBuffer::from_secret(enc) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -490,14 +490,14 @@ pub extern "C" fn askar_key_crypto_box_seal_open(
     handle: LocalKeyHandle,
     ciphertext: ByteBuffer,
     out: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("crypto box seal open: {}", handle);
         check_useful_c_ptr!(out);
         let key = handle.load()?;
         let enc = crypto_box_seal_open(&key, ciphertext.as_slice())?;
         unsafe { *out = SecretBuffer::from_secret(enc) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -511,7 +511,7 @@ pub extern "C" fn askar_key_derive_ecdh_es(
     apv: ByteBuffer,
     receive: i8,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let alg = alg.as_opt_str().unwrap_or_default();
         trace!("ECDH-ES: {}", alg);
@@ -529,7 +529,7 @@ pub extern "C" fn askar_key_derive_ecdh_es(
             receive == 1
         )?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -545,7 +545,7 @@ pub extern "C" fn askar_key_derive_ecdh_1pu(
     cc_tag: ByteBuffer,
     receive: i8,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let alg = alg.as_opt_str().unwrap_or_default();
         trace!("ECDH-1PU: {}", alg);
@@ -566,6 +566,6 @@ pub extern "C" fn askar_key_derive_ecdh_1pu(
             receive == 1
         )?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
diff --git a/src/ffi/log.rs b/src/ffi/log.rs
index abcc7c8e..17884bf8 100644
--- a/src/ffi/log.rs
+++ b/src/ffi/log.rs
@@ -6,7 +6,7 @@ use std::sync::atomic::{AtomicBool, Ordering};
 use log::{LevelFilter, Metadata, Record};
 use once_cell::sync::OnceCell;
 
-use super::error::ErrorCode;
+use super::error::ErrorHandle;
 use crate::error::Error;
 
 static LOGGER: OnceCell<CustomLogger> = OnceCell::new();
@@ -111,7 +111,7 @@ pub extern "C" fn askar_set_custom_logger(
     enabled: Option<EnabledCallback>,
     flush: Option<FlushCallback>,
     max_level: i32,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         let max_level = get_level_filter(max_level)?;
         if LOGGER.set(CustomLogger::new(context, enabled, log, flush)).is_err() {
@@ -121,7 +121,7 @@ pub extern "C" fn askar_set_custom_logger(
             |_| err_msg!(Input, "Repeated logger initialization"))?;
         log::set_max_level(max_level);
         debug!("Initialized custom logger");
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -134,20 +134,20 @@ pub extern "C" fn askar_clear_custom_logger() {
 }
 
 #[no_mangle]
-pub extern "C" fn askar_set_default_logger() -> ErrorCode {
+pub extern "C" fn askar_set_default_logger() -> ErrorHandle {
     catch_err! {
         env_logger::try_init().map_err(
             |_| err_msg!(Input, "Repeated logger initialization"))?;
         debug!("Initialized default logger");
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
-pub extern "C" fn askar_set_max_log_level(max_level: i32) -> ErrorCode {
+pub extern "C" fn askar_set_max_log_level(max_level: i32) -> ErrorHandle {
     catch_err! {
         log::set_max_level(get_level_filter(max_level)?);
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
diff --git a/src/ffi/macros.rs b/src/ffi/macros.rs
index 0f0410e7..8d92eb79 100644
--- a/src/ffi/macros.rs
+++ b/src/ffi/macros.rs
@@ -3,11 +3,11 @@ macro_rules! catch_err {
         match std::panic::catch_unwind(move || -> Result<_, $crate::error::Error> {$($e)*}) {
             Ok(Ok(a)) => a,
             Ok(Err(err)) => { // lib error
-                $crate::ffi::error::set_last_error(Some(err))
+                $crate::ffi::error::store_error(err)
             }
             Err(_) => { // panic error
                 let err: $crate::error::Error = err_msg!(Unexpected, "Panic during execution");
-                $crate::ffi::error::set_last_error(Some(err))
+                $crate::ffi::error::store_error(err)
             }
         }
     }
diff --git a/src/ffi/migration.rs b/src/ffi/migration.rs
index c397aa84..e540b1d8 100644
--- a/src/ffi/migration.rs
+++ b/src/ffi/migration.rs
@@ -4,7 +4,7 @@ use crate::storage::future::spawn_ok;
 use crate::storage::migration::IndySdkToAriesAskarMigration;
 
 use super::{
-    error::{set_last_error, ErrorCode},
+    error::{store_error, ErrorHandle},
     CallbackId, EnsureCallback,
 };
 
@@ -24,9 +24,9 @@ pub extern "C" fn askar_migrate_indy_sdk(
     wallet_name: FfiStr<'_>,
     wallet_key: FfiStr<'_>,
     kdf_level: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err!(
         trace!("Migrate sqlite wallet from indy-sdk structure to aries-askar");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -37,8 +37,8 @@ pub extern "C" fn askar_migrate_indy_sdk(
 
         let cb = EnsureCallback::new(move |result|
             match result {
-                Ok(_) => cb(cb_id, ErrorCode::Success),
-                Err(err) => cb(cb_id, set_last_error(Some(err))),
+                Ok(_) => cb(cb_id, ErrorHandle::OK),
+                Err(err) => cb(cb_id, store_error(err)),
         });
 
         spawn_ok(async move {
@@ -49,6 +49,6 @@ pub extern "C" fn askar_migrate_indy_sdk(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     )
 }
diff --git a/src/ffi/mod.rs b/src/ffi/mod.rs
index baa78d32..fdd9f054 100644
--- a/src/ffi/mod.rs
+++ b/src/ffi/mod.rs
@@ -28,7 +28,6 @@ mod tags;
 #[cfg(all(feature = "migration", feature = "sqlite"))]
 mod migration;
 
-use self::error::ErrorCode;
 use crate::error::Error;
 
 pub type CallbackId = i64;
diff --git a/src/ffi/result_list.rs b/src/ffi/result_list.rs
index a4edd0f1..1e466064 100644
--- a/src/ffi/result_list.rs
+++ b/src/ffi/result_list.rs
@@ -1,7 +1,8 @@
 use std::{ffi::CString, os::raw::c_char, ptr};
 
 use super::{
-    handle::ArcHandle, key::LocalKeyHandle, secret::SecretBuffer, tags::EntryTagSet, ErrorCode,
+    error::ErrorHandle, handle::ArcHandle, key::LocalKeyHandle, secret::SecretBuffer,
+    tags::EntryTagSet,
 };
 use crate::{entry::Entry, error::Error, kms::KeyEntry};
 
@@ -54,12 +55,12 @@ pub type EntryListHandle = ArcHandle<FfiEntryList>;
 pub type FfiEntryList = FfiResultList<Entry>;
 
 #[no_mangle]
-pub extern "C" fn askar_entry_list_count(handle: EntryListHandle, count: *mut i32) -> ErrorCode {
+pub extern "C" fn askar_entry_list_count(handle: EntryListHandle, count: *mut i32) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(count);
         let results = handle.load()?;
         unsafe { *count = results.len() };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -68,13 +69,13 @@ pub extern "C" fn askar_entry_list_get_category(
     handle: EntryListHandle,
     index: i32,
     category: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(category);
         let results = handle.load()?;
         let entry = results.get_row(index)?;
         unsafe { *category = CString::new(entry.category.as_str()).unwrap().into_raw() };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -83,13 +84,13 @@ pub extern "C" fn askar_entry_list_get_name(
     handle: EntryListHandle,
     index: i32,
     name: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(name);
         let results = handle.load()?;
         let entry = results.get_row(index)?;
         unsafe { *name = CString::new(entry.name.as_str()).unwrap().into_raw() };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -98,13 +99,13 @@ pub extern "C" fn askar_entry_list_get_value(
     handle: EntryListHandle,
     index: i32,
     value: *mut SecretBuffer,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(value);
         let results = handle.load()?;
         let entry = results.get_row(index)?;
         unsafe { *value = SecretBuffer::from_secret(entry.value.as_ref()); }
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -113,7 +114,7 @@ pub extern "C" fn askar_entry_list_get_tags(
     handle: EntryListHandle,
     index: i32,
     tags: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(tags);
         let results = handle.load()?;
@@ -124,7 +125,7 @@ pub extern "C" fn askar_entry_list_get_tags(
             let tag_json = serde_json::to_vec(&EntryTagSet::from(entry.tags.as_slice())).unwrap();
             unsafe { *tags = CString::new(tag_json).unwrap().into_raw() };
         }
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -141,12 +142,12 @@ pub type FfiKeyEntryList = FfiResultList<KeyEntry>;
 pub extern "C" fn askar_key_entry_list_count(
     handle: KeyEntryListHandle,
     count: *mut i32,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(count);
         let results = handle.load()?;
         unsafe { *count = results.len() };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -160,7 +161,7 @@ pub extern "C" fn askar_key_entry_list_get_algorithm(
     handle: KeyEntryListHandle,
     index: i32,
     alg: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(alg);
         let results = handle.load()?;
@@ -170,7 +171,7 @@ pub extern "C" fn askar_key_entry_list_get_algorithm(
         } else {
             unsafe { *alg = ptr::null() };
         }
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -179,13 +180,13 @@ pub extern "C" fn askar_key_entry_list_get_name(
     handle: KeyEntryListHandle,
     index: i32,
     name: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(name);
         let results = handle.load()?;
         let entry = results.get_row(index)?;
         unsafe { *name = CString::new(entry.name.as_str()).unwrap().into_raw() };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -194,7 +195,7 @@ pub extern "C" fn askar_key_entry_list_get_metadata(
     handle: KeyEntryListHandle,
     index: i32,
     metadata: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(metadata);
         let results = handle.load()?;
@@ -204,7 +205,7 @@ pub extern "C" fn askar_key_entry_list_get_metadata(
         } else {
             unsafe { *metadata = ptr::null(); }
         }
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -213,7 +214,7 @@ pub extern "C" fn askar_key_entry_list_get_tags(
     handle: KeyEntryListHandle,
     index: i32,
     tags: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(tags);
         let results = handle.load()?;
@@ -224,7 +225,7 @@ pub extern "C" fn askar_key_entry_list_get_tags(
             let tag_json = serde_json::to_vec(&EntryTagSet::from(entry.tags.as_slice())).unwrap();
             unsafe { *tags = CString::new(tag_json).unwrap().into_raw() };
         }
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -233,7 +234,7 @@ pub extern "C" fn askar_key_entry_list_load_local(
     handle: KeyEntryListHandle,
     index: i32,
     out: *mut LocalKeyHandle,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Load key");
         check_useful_c_ptr!(out);
@@ -241,7 +242,7 @@ pub extern "C" fn askar_key_entry_list_load_local(
         let entry = results.get_row(index)?;
         let key = entry.load_local_key()?;
         unsafe { *out = LocalKeyHandle::create(key) };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -250,12 +251,15 @@ pub type StringListHandle = ArcHandle<FfiStringList>;
 pub type FfiStringList = FfiResultList<String>;
 
 #[no_mangle]
-pub extern "C" fn askar_string_list_count(handle: StringListHandle, count: *mut i32) -> ErrorCode {
+pub extern "C" fn askar_string_list_count(
+    handle: StringListHandle,
+    count: *mut i32,
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(count);
         let results = handle.load()?;
         unsafe { *count = results.len() };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -264,13 +268,13 @@ pub extern "C" fn askar_string_list_get_item(
     handle: StringListHandle,
     index: i32,
     item: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         check_useful_c_ptr!(item);
         let results = handle.load()?;
         let entry = results.get_row(index)?;
         unsafe { *item = CString::new(entry.clone()).unwrap().into_raw() };
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
diff --git a/src/ffi/store.rs b/src/ffi/store.rs
index 95e7f0c7..b62c0a71 100644
--- a/src/ffi/store.rs
+++ b/src/ffi/store.rs
@@ -5,13 +5,13 @@ use ffi_support::{rust_string_to_c, ByteBuffer, FfiStr};
 use once_cell::sync::Lazy;
 
 use super::{
-    error::set_last_error,
+    error::{store_error, ErrorHandle},
     key::LocalKeyHandle,
     result_list::{
         EntryListHandle, FfiEntryList, FfiKeyEntryList, KeyEntryListHandle, StringListHandle,
     },
     tags::EntryTagSet,
-    CallbackId, EnsureCallback, ErrorCode, ResourceHandle,
+    CallbackId, EnsureCallback, ResourceHandle,
 };
 use crate::{
     entry::{Entry, EntryOperation, Scan, TagFilter},
@@ -131,7 +131,7 @@ where
 pub extern "C" fn askar_store_generate_raw_key(
     seed: ByteBuffer,
     out: *mut *const c_char,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Create raw store key");
         let seed = match seed.as_slice() {
@@ -140,7 +140,7 @@ pub extern "C" fn askar_store_generate_raw_key(
         };
         let key = Store::new_raw_key(seed)?;
         unsafe { *out = rust_string_to_c(key.to_string()); }
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -151,9 +151,9 @@ pub extern "C" fn askar_store_provision(
     pass_key: FfiStr<'_>,
     profile: FfiStr<'_>,
     recreate: i8,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, handle: StoreHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, handle: StoreHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Provision store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -168,9 +168,9 @@ pub extern "C" fn askar_store_provision(
             match result {
                 Ok(sid) => {
                     debug!("Provisioned store {}", sid);
-                    cb(cb_id, ErrorCode::Success, sid)
+                    cb(cb_id, ErrorHandle::OK, sid)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err)), StoreHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), StoreHandle::invalid()),
             }
         );
         spawn_ok(async move {
@@ -186,7 +186,7 @@ pub extern "C" fn askar_store_provision(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -196,9 +196,9 @@ pub extern "C" fn askar_store_open(
     key_method: FfiStr<'_>,
     pass_key: FfiStr<'_>,
     profile: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, handle: StoreHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, handle: StoreHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Open store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -213,9 +213,9 @@ pub extern "C" fn askar_store_open(
             match result {
                 Ok(sid) => {
                     debug!("Opened store {}", sid);
-                    cb(cb_id, ErrorCode::Success, sid)
+                    cb(cb_id, ErrorHandle::OK, sid)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err)), StoreHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), StoreHandle::invalid()),
             }
         );
         spawn_ok(async move {
@@ -230,31 +230,31 @@ pub extern "C" fn askar_store_open(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
 pub extern "C" fn askar_store_remove(
     spec_uri: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, i8)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, i8)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Remove store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
         let spec_uri = spec_uri.into_opt_string().ok_or_else(|| err_msg!("No store URI provided"))?;
         let cb = EnsureCallback::new(move |result: Result<bool,Error>|
             match result {
-                Ok(removed) => cb(cb_id, ErrorCode::Success, removed as i8),
-                Err(err) => cb(cb_id, set_last_error(Some(err)), 0),
+                Ok(removed) => cb(cb_id, ErrorHandle::OK, removed as i8),
+                Err(err) => cb(cb_id, store_error(err), 0),
             }
         );
         spawn_ok(async move {
             let result = Store::remove(spec_uri.as_str()).await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -262,17 +262,17 @@ pub extern "C" fn askar_store_remove(
 pub extern "C" fn askar_store_create_profile(
     handle: StoreHandle,
     profile: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, result_p: *const c_char)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, result_p: *const c_char)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Create profile");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
         let profile = profile.into_opt_string();
         let cb = EnsureCallback::new(move |result|
             match result {
-                Ok(name) => cb(cb_id, ErrorCode::Success, rust_string_to_c(name)),
-                Err(err) => cb(cb_id, set_last_error(Some(err)), ptr::null()),
+                Ok(name) => cb(cb_id, ErrorHandle::OK, rust_string_to_c(name)),
+                Err(err) => cb(cb_id, store_error(err), ptr::null()),
             }
         );
         spawn_ok(async move {
@@ -283,23 +283,23 @@ pub extern "C" fn askar_store_create_profile(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
 pub extern "C" fn askar_store_get_profile_name(
     handle: StoreHandle,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, name: *const c_char)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, name: *const c_char)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Get profile name");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
         let cb = EnsureCallback::new(move |result|
             match result {
-                Ok(name) => cb(cb_id, ErrorCode::Success, rust_string_to_c(name)),
-                Err(err) => cb(cb_id, set_last_error(Some(err)), ptr::null_mut()),
+                Ok(name) => cb(cb_id, ErrorHandle::OK, rust_string_to_c(name)),
+                Err(err) => cb(cb_id, store_error(err), ptr::null_mut()),
             }
         );
         spawn_ok(async move {
@@ -309,16 +309,16 @@ pub extern "C" fn askar_store_get_profile_name(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
 pub extern "C" fn askar_store_list_profiles(
     handle: StoreHandle,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, results: StringListHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, results: StringListHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("List profiles");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -326,9 +326,9 @@ pub extern "C" fn askar_store_list_profiles(
             match result {
                 Ok(rows) => {
                     let res = StringListHandle::create(FfiStringList::from(rows));
-                    cb(cb_id, ErrorCode::Success, res)
+                    cb(cb_id, ErrorHandle::OK, res)
                 },
-                Err(err) => cb(cb_id, set_last_error(Some(err)), StringListHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), StringListHandle::invalid()),
             }
         );
         spawn_ok(async move {
@@ -339,7 +339,7 @@ pub extern "C" fn askar_store_list_profiles(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -347,17 +347,17 @@ pub extern "C" fn askar_store_list_profiles(
 pub extern "C" fn askar_store_remove_profile(
     handle: StoreHandle,
     profile: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, removed: i8)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, removed: i8)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Remove profile");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
         let profile = profile.into_opt_string().ok_or_else(|| err_msg!("Profile name not provided"))?;
         let cb = EnsureCallback::new(move |result|
             match result {
-                Ok(removed) => cb(cb_id, ErrorCode::Success, removed as i8),
-                Err(err) => cb(cb_id, set_last_error(Some(err)), 0),
+                Ok(removed) => cb(cb_id, ErrorHandle::OK, removed as i8),
+                Err(err) => cb(cb_id, store_error(err), 0),
             }
         );
         spawn_ok(async move {
@@ -367,24 +367,24 @@ pub extern "C" fn askar_store_remove_profile(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
 pub extern "C" fn askar_store_get_default_profile(
     handle: StoreHandle,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, profile: *const c_char)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, profile: *const c_char)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Get default profile");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
         let cb = EnsureCallback::new(move |result: Result<String, Error>|
             match result {
-                Ok(name) => cb(cb_id, ErrorCode::Success,
+                Ok(name) => cb(cb_id, ErrorHandle::OK,
                     CString::new(name.as_str()).unwrap().into_raw() as *const c_char),
-                Err(err) => cb(cb_id, set_last_error(Some(err)), ptr::null()),
+                Err(err) => cb(cb_id, store_error(err), ptr::null()),
             }
         );
         spawn_ok(async move {
@@ -394,7 +394,7 @@ pub extern "C" fn askar_store_get_default_profile(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -402,17 +402,17 @@ pub extern "C" fn askar_store_get_default_profile(
 pub extern "C" fn askar_store_set_default_profile(
     handle: StoreHandle,
     profile: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Set default profile");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
         let profile = profile.into_opt_string().ok_or_else(|| err_msg!("Profile name not provided"))?;
         let cb = EnsureCallback::new(move |result|
             match result {
-                Ok(_) => cb(cb_id, ErrorCode::Success),
-                Err(err) => cb(cb_id, set_last_error(Some(err))),
+                Ok(_) => cb(cb_id, ErrorHandle::OK),
+                Err(err) => cb(cb_id, store_error(err)),
             }
         );
         spawn_ok(async move {
@@ -422,7 +422,7 @@ pub extern "C" fn askar_store_set_default_profile(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -431,9 +431,9 @@ pub extern "C" fn askar_store_rekey(
     handle: StoreHandle,
     key_method: FfiStr<'_>,
     pass_key: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Re-key store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -444,8 +444,8 @@ pub extern "C" fn askar_store_rekey(
         let pass_key = PassKey::from(pass_key.as_opt_str()).into_owned();
         let cb = EnsureCallback::new(move |result|
             match result {
-                Ok(_) => cb(cb_id, ErrorCode::Success),
-                Err(err) => cb(cb_id, set_last_error(Some(err))),
+                Ok(_) => cb(cb_id, ErrorHandle::OK),
+                Err(err) => cb(cb_id, store_error(err)),
             }
         );
         spawn_ok(async move {
@@ -457,7 +457,7 @@ pub extern "C" fn askar_store_rekey(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -468,9 +468,9 @@ pub extern "C" fn askar_store_copy(
     key_method: FfiStr<'_>,
     pass_key: FfiStr<'_>,
     recreate: i8,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, handle: StoreHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, handle: StoreHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Copy store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -482,8 +482,8 @@ pub extern "C" fn askar_store_copy(
         let pass_key = PassKey::from(pass_key.as_opt_str()).into_owned();
         let cb = EnsureCallback::new(move |result|
             match result {
-                Ok(handle) => cb(cb_id, ErrorCode::Success, handle),
-                Err(err) => cb(cb_id, set_last_error(Some(err)), StoreHandle::invalid()),
+                Ok(handle) => cb(cb_id, ErrorHandle::OK, handle),
+                Err(err) => cb(cb_id, store_error(err), StoreHandle::invalid()),
             }
         );
         spawn_ok(async move {
@@ -495,23 +495,23 @@ pub extern "C" fn askar_store_copy(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
 pub extern "C" fn askar_store_close(
     handle: StoreHandle,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Close store");
         let cb = cb.map(|cb| {
             EnsureCallback::new(move |result|
                 match result {
-                    Ok(_) => cb(cb_id, ErrorCode::Success),
-                    Err(err) => cb(cb_id, set_last_error(Some(err))),
+                    Ok(_) => cb(cb_id, ErrorHandle::OK),
+                    Err(err) => cb(cb_id, store_error(err)),
                 }
             )
         });
@@ -534,7 +534,7 @@ pub extern "C" fn askar_store_close(
                 error!("{}", err);
             }
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -546,9 +546,9 @@ pub extern "C" fn askar_scan_start(
     tag_filter: FfiStr<'_>,
     offset: i64,
     limit: i64,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, handle: ScanHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, handle: ScanHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Scan store start");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -559,9 +559,9 @@ pub extern "C" fn askar_scan_start(
             match result {
                 Ok(scan_handle) => {
                     debug!("Started scan {} on store {}", scan_handle, handle);
-                    cb(cb_id, ErrorCode::Success, scan_handle)
+                    cb(cb_id, ErrorHandle::OK, scan_handle)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err)), ScanHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), ScanHandle::invalid()),
             }
         );
         spawn_ok(async move {
@@ -572,16 +572,16 @@ pub extern "C" fn askar_scan_start(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
 pub extern "C" fn askar_scan_next(
     handle: ScanHandle,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, results: EntryListHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, results: EntryListHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Scan store next");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -589,10 +589,10 @@ pub extern "C" fn askar_scan_next(
             match result {
                 Ok(Some(entries)) => {
                     let results = EntryListHandle::create(FfiEntryList::from(entries));
-                    cb(cb_id, ErrorCode::Success, results)
+                    cb(cb_id, ErrorHandle::OK, results)
                 },
-                Ok(None) => cb(cb_id, ErrorCode::Success, EntryListHandle::invalid()),
-                Err(err) => cb(cb_id, set_last_error(Some(err)), EntryListHandle::invalid()),
+                Ok(None) => cb(cb_id, ErrorHandle::OK, EntryListHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), EntryListHandle::invalid()),
             }
         );
         spawn_ok(async move {
@@ -603,12 +603,12 @@ pub extern "C" fn askar_scan_next(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
 #[no_mangle]
-pub extern "C" fn askar_scan_free(handle: ScanHandle) -> ErrorCode {
+pub extern "C" fn askar_scan_free(handle: ScanHandle) -> ErrorHandle {
     catch_err! {
         trace!("Close scan");
         spawn_ok(async move {
@@ -620,7 +620,7 @@ pub extern "C" fn askar_scan_free(handle: ScanHandle) -> ErrorCode {
                 debug!("Scan not found for closing: {}", handle);
             }
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -629,9 +629,9 @@ pub extern "C" fn askar_session_start(
     handle: StoreHandle,
     profile: FfiStr<'_>,
     as_transaction: i8,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, handle: SessionHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, handle: SessionHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Session start");
         let profile = profile.into_opt_string();
@@ -640,9 +640,9 @@ pub extern "C" fn askar_session_start(
             match result {
                 Ok(sess_handle) => {
                     debug!("Started session {} on store {} (txn: {})", sess_handle, handle, as_transaction != 0);
-                    cb(cb_id, ErrorCode::Success, sess_handle)
+                    cb(cb_id, ErrorHandle::OK, sess_handle)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err)), SessionHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), SessionHandle::invalid()),
             }
         );
         spawn_ok(async move {
@@ -657,7 +657,7 @@ pub extern "C" fn askar_session_start(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -666,9 +666,9 @@ pub extern "C" fn askar_session_count(
     handle: SessionHandle,
     category: FfiStr<'_>,
     tag_filter: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, count: i64)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, count: i64)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Count from store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -676,8 +676,8 @@ pub extern "C" fn askar_session_count(
         let tag_filter = tag_filter.as_opt_str().map(TagFilter::from_str).transpose()?;
         let cb = EnsureCallback::new(move |result: Result<i64,Error>|
             match result {
-                Ok(count) => cb(cb_id, ErrorCode::Success, count),
-                Err(err) => cb(cb_id, set_last_error(Some(err)), 0),
+                Ok(count) => cb(cb_id, ErrorHandle::OK, count),
+                Err(err) => cb(cb_id, store_error(err), 0),
             }
         );
         spawn_ok(async move {
@@ -687,7 +687,7 @@ pub extern "C" fn askar_session_count(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -697,9 +697,9 @@ pub extern "C" fn askar_session_fetch(
     category: FfiStr<'_>,
     name: FfiStr<'_>,
     for_update: i8,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, results: EntryListHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, results: EntryListHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Fetch from store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -709,10 +709,10 @@ pub extern "C" fn askar_session_fetch(
             match result {
                 Ok(Some(entry)) => {
                     let results = EntryListHandle::create(FfiEntryList::from(entry));
-                    cb(cb_id, ErrorCode::Success, results)
+                    cb(cb_id, ErrorHandle::OK, results)
                 },
-                Ok(None) => cb(cb_id, ErrorCode::Success, EntryListHandle::invalid()),
-                Err(err) => cb(cb_id, set_last_error(Some(err)), EntryListHandle::invalid()),
+                Ok(None) => cb(cb_id, ErrorHandle::OK, EntryListHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), EntryListHandle::invalid()),
             }
         );
         spawn_ok(async move {
@@ -722,7 +722,7 @@ pub extern "C" fn askar_session_fetch(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -733,9 +733,9 @@ pub extern "C" fn askar_session_fetch_all(
     tag_filter: FfiStr<'_>,
     limit: i64,
     for_update: i8,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, results: EntryListHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, results: EntryListHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Count from store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -746,9 +746,9 @@ pub extern "C" fn askar_session_fetch_all(
             match result {
                 Ok(rows) => {
                     let results = EntryListHandle::create(FfiEntryList::from(rows));
-                    cb(cb_id, ErrorCode::Success, results)
+                    cb(cb_id, ErrorHandle::OK, results)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err)), EntryListHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), EntryListHandle::invalid()),
             }
         );
         spawn_ok(async move {
@@ -758,7 +758,7 @@ pub extern "C" fn askar_session_fetch_all(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -767,9 +767,9 @@ pub extern "C" fn askar_session_remove_all(
     handle: SessionHandle,
     category: FfiStr<'_>,
     tag_filter: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, removed: i64)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, removed: i64)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Count from store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -778,9 +778,9 @@ pub extern "C" fn askar_session_remove_all(
         let cb = EnsureCallback::new(move |result|
             match result {
                 Ok(removed) => {
-                    cb(cb_id, ErrorCode::Success, removed)
+                    cb(cb_id, ErrorHandle::OK, removed)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err)), 0),
+                Err(err) => cb(cb_id, store_error(err), 0),
             }
         );
         spawn_ok(async move {
@@ -790,7 +790,7 @@ pub extern "C" fn askar_session_remove_all(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -803,9 +803,9 @@ pub extern "C" fn askar_session_update(
     value: ByteBuffer,
     tags: FfiStr<'_>,
     expiry_ms: i64,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Update store");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -834,8 +834,8 @@ pub extern "C" fn askar_session_update(
         };
         let cb = EnsureCallback::new(move |result|
             match result {
-                Ok(_) => cb(cb_id, ErrorCode::Success),
-                Err(err) => cb(cb_id, set_last_error(Some(err))),
+                Ok(_) => cb(cb_id, ErrorHandle::OK),
+                Err(err) => cb(cb_id, store_error(err)),
             }
         );
         spawn_ok(async move {
@@ -845,7 +845,7 @@ pub extern "C" fn askar_session_update(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -857,9 +857,9 @@ pub extern "C" fn askar_session_insert_key(
     metadata: FfiStr<'_>,
     tags: FfiStr<'_>,
     expiry_ms: i64,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Insert key");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -883,9 +883,9 @@ pub extern "C" fn askar_session_insert_key(
         let cb = EnsureCallback::new(move |result|
             match result {
                 Ok(_) => {
-                    cb(cb_id, ErrorCode::Success)
+                    cb(cb_id, ErrorHandle::OK)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err))),
+                Err(err) => cb(cb_id, store_error(err)),
             }
         );
 
@@ -902,7 +902,7 @@ pub extern "C" fn askar_session_insert_key(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -911,9 +911,9 @@ pub extern "C" fn askar_session_fetch_key(
     handle: SessionHandle,
     name: FfiStr<'_>,
     for_update: i8,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, results: KeyEntryListHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, results: KeyEntryListHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Fetch key");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -923,12 +923,12 @@ pub extern "C" fn askar_session_fetch_key(
             match result {
                 Ok(Some(entry)) => {
                     let results = KeyEntryListHandle::create(FfiKeyEntryList::from(entry));
-                    cb(cb_id, ErrorCode::Success, results)
+                    cb(cb_id, ErrorHandle::OK, results)
                 }
                 Ok(None) => {
-                    cb(cb_id, ErrorCode::Success, KeyEntryListHandle::invalid())
+                    cb(cb_id, ErrorHandle::OK, KeyEntryListHandle::invalid())
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err)), KeyEntryListHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), KeyEntryListHandle::invalid()),
             }
         );
 
@@ -942,7 +942,7 @@ pub extern "C" fn askar_session_fetch_key(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -954,9 +954,9 @@ pub extern "C" fn askar_session_fetch_all_keys(
     tag_filter: FfiStr<'_>,
     limit: i64,
     for_update: i8,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode, results: KeyEntryListHandle)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle, results: KeyEntryListHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Fetch all keys");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -969,9 +969,9 @@ pub extern "C" fn askar_session_fetch_all_keys(
             match result {
                 Ok(entries) => {
                     let results = KeyEntryListHandle::create(FfiKeyEntryList::from(entries));
-                    cb(cb_id, ErrorCode::Success, results)
+                    cb(cb_id, ErrorHandle::OK, results)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err)), KeyEntryListHandle::invalid()),
+                Err(err) => cb(cb_id, store_error(err), KeyEntryListHandle::invalid()),
             }
         );
 
@@ -988,7 +988,7 @@ pub extern "C" fn askar_session_fetch_all_keys(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -999,9 +999,9 @@ pub extern "C" fn askar_session_update_key(
     metadata: FfiStr<'_>,
     tags: FfiStr<'_>,
     expiry_ms: i64,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Update key");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -1024,9 +1024,9 @@ pub extern "C" fn askar_session_update_key(
         let cb = EnsureCallback::new(move |result|
             match result {
                 Ok(_) => {
-                    cb(cb_id, ErrorCode::Success)
+                    cb(cb_id, ErrorHandle::OK)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err))),
+                Err(err) => cb(cb_id, store_error(err)),
             }
         );
 
@@ -1043,7 +1043,7 @@ pub extern "C" fn askar_session_update_key(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -1051,9 +1051,9 @@ pub extern "C" fn askar_session_update_key(
 pub extern "C" fn askar_session_remove_key(
     handle: SessionHandle,
     name: FfiStr<'_>,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Remove key");
         let cb = cb.ok_or_else(|| err_msg!("No callback provided"))?;
@@ -1061,9 +1061,9 @@ pub extern "C" fn askar_session_remove_key(
         let cb = EnsureCallback::new(move |result|
             match result {
                 Ok(_) => {
-                    cb(cb_id, ErrorCode::Success)
+                    cb(cb_id, ErrorHandle::OK)
                 }
-                Err(err) => cb(cb_id, set_last_error(Some(err))),
+                Err(err) => cb(cb_id, store_error(err)),
             }
         );
 
@@ -1076,7 +1076,7 @@ pub extern "C" fn askar_session_remove_key(
             }.await;
             cb.resolve(result);
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }
 
@@ -1084,17 +1084,17 @@ pub extern "C" fn askar_session_remove_key(
 pub extern "C" fn askar_session_close(
     handle: SessionHandle,
     commit: i8,
-    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorCode)>,
+    cb: Option<extern "C" fn(cb_id: CallbackId, err: ErrorHandle)>,
     cb_id: CallbackId,
-) -> ErrorCode {
+) -> ErrorHandle {
     catch_err! {
         trace!("Close session");
         let cb = cb.map(|cb| {
             EnsureCallback::new(move |result|
                 match result {
-                    Ok(_) => cb(cb_id, ErrorCode::Success),
+                    Ok(_) => cb(cb_id, ErrorHandle::OK),
                     Err(err) => {
-                        cb(cb_id, set_last_error(Some(err)))
+                        cb(cb_id, store_error(err))
                     }
                 }
             )
@@ -1124,6 +1124,6 @@ pub extern "C" fn askar_session_close(
                 error!("{}", err);
             }
         });
-        Ok(ErrorCode::Success)
+        Ok(ErrorHandle::OK)
     }
 }

From ef13a8ed54e139cfb91a4c86b8edd776face14cf Mon Sep 17 00:00:00 2001
From: Andrew Whitehead <cywolf@gmail.com>
Date: Tue, 19 Dec 2023 11:37:40 -0800
Subject: [PATCH 2/4] update error handling in python wrapper

Signed-off-by: Andrew Whitehead <cywolf@gmail.com>
---
 wrappers/python/aries_askar/bindings/lib.py | 53 +++++++++++++--------
 1 file changed, 33 insertions(+), 20 deletions(-)

diff --git a/wrappers/python/aries_askar/bindings/lib.py b/wrappers/python/aries_askar/bindings/lib.py
index 6c13cfb7..f5030539 100644
--- a/wrappers/python/aries_askar/bindings/lib.py
+++ b/wrappers/python/aries_askar/bindings/lib.py
@@ -44,6 +44,15 @@
 }
 
 
+class ErrorHandle(Structure):
+    _fields_ = [
+        ("value", c_int64),
+    ]
+
+    def __bool__(self) -> bool:
+        return self.value != 0
+
+
 def _convert_log_level(level: Union[str, int, None]):
     if level is None or level == "-1":
         return -1
@@ -187,14 +196,15 @@ def _enabled_cb(_context, level: int) -> bool:
             (c_void_p, c_void_p, c_void_p, c_void_p, c_int32),
             restype=c_int64,
         )
-        if set_logger(
+        err = set_logger(
             None,  # context
             self._log_cb,
             self._log_enabled_cb,
             None,  # flush
             level,
-        ):
-            raise self.get_current_error(True)
+        )
+        if err:
+            raise self.fetch_error(err)
 
         try:
             finalize(self, self.method("askar_clear_custom_logger", None, restype=None))
@@ -204,19 +214,19 @@ def _enabled_cb(_context, level: int) -> bool:
 
     def invoke(self, name, argtypes, *args):
         """Perform a synchronous library function call."""
-        method = self.method(name, argtypes, restype=c_int64)
+        method = self.method(name, argtypes, restype=ErrorHandle)
         if not method:
             raise ValueError(f"FFI method not found: {name}")
         args = _load_method_arguments(name, argtypes, args)
-        result = method(*args)
-        if result:
-            raise self.get_current_error(True)
+        err = method(*args)
+        if err:
+            raise self.fetch_error(err)
 
     def invoke_async(
         self, name: str, argtypes, *args, return_type=None
     ) -> asyncio.Future:
         """Perform an asynchronous library function call."""
-        method = self.method(name, (*argtypes, c_void_p, c_int64), restype=c_int64)
+        method = self.method(name, (*argtypes, c_void_p, c_int64), restype=ErrorHandle)
         if not method:
             raise ValueError(f"FFI method not found: {name}")
         loop = asyncio.get_event_loop()
@@ -225,7 +235,7 @@ def invoke_async(
         if cb_info:
             cb = cb_info[1]
         else:
-            cb_args = [c_int64, c_int64]
+            cb_args = [c_int64, ErrorHandle]
             if return_type:
                 cb_args.append(return_type)
             cb_type = CFUNCTYPE(None, *cb_args)
@@ -236,10 +246,10 @@ def invoke_async(
         args = _load_method_arguments(name, argtypes, args)
         cb_id = next(self._cb_id)
         self._callbacks[cb_id] = (loop, fut, name)
-        result = method(*args, cb, cb_id)
-        if result:
+        err = method(*args, cb, cb_id)
+        if err:
             # FFI must not execute the callback if an error is returned
-            err = self.get_current_error(True)
+            err = self.fetch_error(err)
             if self._callbacks.pop(cb_id, None):
                 self._fulfill_future(fut, None, err)
         return fut
@@ -249,8 +259,8 @@ def invoke_dtor(self, name: str, *values, argtypes=None, restype=None):
         if method:
             method(*values)
 
-    def _handle_callback(self, cb_id: int, err: int, result=None):
-        exc = self.get_current_error(True) if err else None
+    def _handle_callback(self, cb_id: int, err: ErrorHandle, result=None):
+        exc = self.fetch_error(err) if err else None
         cb = self._callbacks.pop(cb_id, None)
         if not cb:
             LOGGER.info("Callback already fulfilled: %s", cb_id)
@@ -267,7 +277,7 @@ def _fulfill_future(self, fut: asyncio.Future, result, err: Exception = None):
         else:
             fut.set_result(result)
 
-    def get_current_error(self, expect: bool = False) -> Optional[AskarError]:
+    def fetch_error(self, handle: ErrorHandle) -> Optional[AskarError]:
         """
         Get the error result from the previous failed API method.
 
@@ -276,20 +286,23 @@ def get_current_error(self, expect: bool = False) -> Optional[AskarError]:
         """
         err_json = StrBuffer()
         method = self.method(
-            "askar_get_current_error", (POINTER(StrBuffer),), restype=c_int64
+            "askar_fetch_error",
+            (
+                ErrorHandle,
+                POINTER(StrBuffer),
+            ),
+            restype=c_int64,
         )
-        if not method(byref(err_json)):
+        if not method(handle, byref(err_json)):
             try:
                 msg = json.loads(err_json.value)
             except json.JSONDecodeError:
-                LOGGER.warning("JSON decode error for askar_get_current_error")
+                LOGGER.warning("JSON decode error for askar_fetch_error")
                 msg = None
             if msg and "message" in msg and "code" in msg:
                 return AskarError(
                     AskarErrorCode(msg["code"]), msg["message"], msg.get("extra")
                 )
-            if not expect:
-                return None
         return AskarError(AskarErrorCode.WRAPPER, "Unknown error")
 
     def method(self, name, argtypes, *, restype=None):

From ccd8384817a4ac9c28202cb4807f55fc4e4c2408 Mon Sep 17 00:00:00 2001
From: Andrew Whitehead <cywolf@gmail.com>
Date: Tue, 19 Dec 2023 12:06:14 -0800
Subject: [PATCH 3/4] use lockfile when installing cross

Signed-off-by: Andrew Whitehead <cywolf@gmail.com>
---
 .github/workflows/build.yml | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 954505ac..bda21e9d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -68,7 +68,7 @@ jobs:
       - if: ${{ runner.os == 'Linux' }}
         name: Pre-install cross
         run: |
-          cargo install --bins --git https://github.com/rust-embedded/cross --tag v${{ env.CROSS_VERSION }} cross
+          cargo install --bins --git https://github.com/rust-embedded/cross --locked --tag v${{ env.CROSS_VERSION }} cross
 
   tests:
     name: Run tests
@@ -163,7 +163,7 @@ jobs:
         shell: sh
         run: |
           if [ -n "${{ matrix.use_cross }}" ]; then
-            cargo install --bins --git https://github.com/rust-embedded/cross --tag v${{ env.CROSS_VERSION }} cross
+            cargo install --bins --git https://github.com/rust-embedded/cross --locked --tag v${{ env.CROSS_VERSION }} cross
             # Required for compatibility with manylinux2014.
             # https://github.com/briansmith/ring/issues/1728
             if [ "${{ matrix.architecture }}" = "linux-aarch64" ]; then
@@ -399,6 +399,7 @@ jobs:
   build-android:
     name: Build library (Android)
     needs: [checks]
+    # NB: RUST_VERSION must be <1.68 here to support NDK 17
     env:
       RUST_VERSION: "1.67"
 
@@ -431,7 +432,7 @@ jobs:
 
       - name: Build
         run: |
-          cargo install --bins --git https://github.com/rust-embedded/cross --tag v${{ env.CROSS_VERSION }} cross
+          cargo install --bins --git https://github.com/rust-embedded/cross --locked --tag v${{ env.CROSS_VERSION }} cross
           # Required for compatibility with manylinux2014:
           # https://github.com/briansmith/ring/issues/1728
           if [ "${{ matrix.target }}" = "aarch64-linux-android" ]; then

From 7cc54aba3b2b8071ac02b7df502e0a2ec5e76b12 Mon Sep 17 00:00:00 2001
From: Andrew Whitehead <cywolf@gmail.com>
Date: Tue, 19 Dec 2023 12:37:48 -0800
Subject: [PATCH 4/4] add lockfile

Signed-off-by: Andrew Whitehead <cywolf@gmail.com>
---
 .gitignore |    1 -
 Cargo.lock | 2952 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 2952 insertions(+), 1 deletion(-)
 create mode 100644 Cargo.lock

diff --git a/.gitignore b/.gitignore
index 821b8191..9a26b4c5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,7 +3,6 @@ target
 *.bak.db
 *.db-shm
 *.db-wal
-Cargo.lock
 .DS_Store
 *.tgz
 *.so
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 00000000..6090ecc1
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2952 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "aead"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
+dependencies = [
+ "crypto-common",
+ "generic-array",
+]
+
+[[package]]
+name = "aes"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac1f845298e95f983ff1944b728ae08b8cebab80d684f0a832ed0fc74dfa27e2"
+dependencies = [
+ "cfg-if",
+ "cipher",
+ "cpufeatures",
+]
+
+[[package]]
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+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "831010a0f742e1209b3bcea8fab6a8e149051ba6099432c8cb2cc117dec3ead1"
+dependencies = [
+ "aead",
+ "aes",
+ "cipher",
+ "ctr",
+ "ghash",
+ "subtle",
+]
+
+[[package]]
+name = "ahash"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91429305e9f0a25f6205c5b8e0d2db09e0708a7a6df0f42212bb56c32c8ac97a"
+dependencies = [
+ "cfg-if",
+ "getrandom",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
+[[package]]
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+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "allocator-api2"
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+
+[[package]]
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+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
+
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+checksum = "7079075b41f533b8c61d2a4d073c4676e1f8b249ff94a393b0595db304e0dd87"
+
+[[package]]
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+
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+dependencies = [
+ "base64ct",
+ "blake2",
+ "cpufeatures",
+ "password-hash",
+]
+
+[[package]]
+name = "aries-askar"
+version = "0.3.0"
+dependencies = [
+ "askar-crypto",
+ "askar-storage",
+ "async-lock",
+ "criterion",
+ "env_logger",
+ "ffi-support",
+ "jemallocator",
+ "log",
+ "once_cell",
+ "rand",
+ "serde",
+ "serde_cbor",
+ "serde_json",
+ "zeroize",
+]
+
+[[package]]
+name = "askar-crypto"
+version = "0.3.0"
+dependencies = [
+ "aead",
+ "aes",
+ "aes-gcm",
+ "arbitrary",
+ "argon2",
+ "base64",
+ "blake2",
+ "block-modes",
+ "bls12_381",
+ "cbc",
+ "chacha20",
+ "chacha20poly1305",
+ "cipher",
+ "criterion",
+ "crypto_box",
+ "curve25519-dalek",
+ "digest",
+ "ed25519-dalek",
+ "elliptic-curve",
+ "group",
+ "hex-literal",
+ "hkdf",
+ "hmac",
+ "k256",
+ "p256",
+ "p384",
+ "rand",
+ "serde",
+ "serde-json-core",
+ "serde_cbor",
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+
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