WIP

noir-projects/aztec-nr/aztec/src/encrypted_logs/encrypted_event_emission.nr

@@ -1,8 +1,7 @@
 use crate::{
     context::PrivateContext, event::event_interface::EventInterface,
     encrypted_logs::payload::compute_encrypted_log,
-    keys::{getters::get_public_keys, public_keys::{OvpkM, IvpkM}},
-    oracle::unsafe_rand::unsafe_rand
+    keys::{getters::get_public_keys, public_keys::{OvpkM, IvpkM}}, oracle::unsafe_rand::unsafe_rand
 };
 use dep::protocol_types::{address::AztecAddress, hash::sha256_to_field};
 

noir-projects/aztec-nr/aztec/src/hash.nr

@@ -4,7 +4,6 @@ use dep::protocol_types::{
     point::Point, traits::Hash,
     hash::{sha256_to_field, poseidon2_hash_with_separator, poseidon2_hash_with_separator_slice}
 };
-use crate::oracle::logs_traits::ToBytesForUnencryptedLog;
 
 pub use dep::protocol_types::hash::{compute_siloed_nullifier, pedersen_hash};
 
@@ -16,25 +15,19 @@ pub fn compute_secret_hash(secret: Field) -> Field {
     poseidon2_hash_with_separator([secret], GENERATOR_INDEX__SECRET_HASH)
 }
 
-pub fn compute_unencrypted_log_hash<T, let N: u32, let M: u32>(
-    contract_address: AztecAddress,
-    log: T
-) -> Field where T: ToBytesForUnencryptedLog<N, M> {
-    let message_bytes: [u8; N] = log.to_be_bytes_arr();
-    // can't use N - not in scope error
-    let n = message_bytes.len();
-    let mut hash_bytes = [0; M];
+pub fn compute_unencrypted_log_hash<let N: u32>(contract_address: AztecAddress, log: [u8; N]) -> Field {
+    let mut hash_bytes = [0; N + 36];
     // Address is converted to 32 bytes in ts
-    let address_bytes = contract_address.to_be_bytes_arr();
+    let address_bytes: [u8; 32] = contract_address.to_field().to_be_bytes();
     for i in 0..32 {
         hash_bytes[i] = address_bytes[i];
     }
-    let len_bytes: [u8; 4] = (n as Field).to_be_bytes();
+    let len_bytes: [u8; 4] = (N as Field).to_be_bytes();
     for i in 0..4 {
         hash_bytes[32 + i] = len_bytes[i];
     }
-    for i in 0..n {
-        hash_bytes[36 + i] = message_bytes[i];
+    for i in 0..N {
+        hash_bytes[36 + i] = log[i];
     }
 
     sha256_to_field(hash_bytes)
@@ -148,22 +141,22 @@ fn compute_unenc_log_hash_array() {
 fn compute_unenc_log_hash_addr() {
     let contract_address = AztecAddress::from_field(0x233a3e0df23b2b15b324194cb4a151f26c0b7333250781d34cc269d85dc334c6);
     let log = AztecAddress::from_field(0x26aa302d4715fd8a687453cb26d616b0768027bd54bcae56b09d908ecd9f8303);
-    let hash = compute_unencrypted_log_hash(contract_address, log);
+    let hash = compute_unencrypted_log_hash(contract_address, log.to_field().to_be_bytes());
     assert(hash == 0x0083ab647dfb26e7ddee90a0f4209d049d4660cab42000c544b986aaa84c55a3);
 }
 
 #[test]
 fn compute_unenc_log_hash_str() {
     let contract_address = AztecAddress::from_field(0x1b401e1146c5c507962287065c81f0ef7590adae3802c533d7549d6bf0a41bd8);
     let log = "dummy";
-    let hash = compute_unencrypted_log_hash(contract_address, log);
+    let hash = compute_unencrypted_log_hash(contract_address, log.to_field().to_be_bytes());
     assert(hash == 0x00629e88ebd6374f44aa6cfe07e251ecf07213ebc7267e8f6b578ae57ffd6c20);
 }
 
 #[test]
 fn compute_unenc_log_hash_longer_str() {
     let contract_address = AztecAddress::from_field(0x1b401e1146c5c507962287065c81f0ef7590adae3802c533d7549d6bf0a41bd8);
     let log = "Hello this is a string";
-    let hash = compute_unencrypted_log_hash(contract_address, log);
+    let hash = compute_unencrypted_log_hash(contract_address, log.to_field().to_be_bytes());
     assert(hash == 0x0098637962f7d34fa202b7ffad8a07a238c5d1fd897b82a108f7f467fa73b841);
 }

noir-projects/aztec-nr/aztec/src/oracle/mod.nr

@@ -20,7 +20,6 @@ mod header;
 mod notes;
 mod storage;
 mod logs;
-mod logs_traits;
 mod returns;
 
 // debug_log oracle is used by both noir-protocol-circuits and this crate and for this reason we just re-export it

noir-projects/aztec-nr/aztec/src/utils/mod.nr

@@ -2,5 +2,6 @@ mod collapse_array;
 mod comparison;
 mod point;
 mod test;
+mod to_bytes;
 
 pub use crate::utils::collapse_array::collapse_array;

noir-projects/aztec-nr/aztec/src/utils/to_bytes.nr

@@ -0,0 +1,25 @@
+pub fn arr_to_be_bytes_arr<let L: u32>(fields: [Field; L]) -> [u8; L * 32] {
+    let mut bytes = [0 as u8; L * 32];
+    for i in 0..L {
+        // Note that bytes.append() results in bound error
+        let to_add: [u8; 32] = fields[i].to_be_bytes();
+        for j in 0..32 {
+            bytes[i * 32 + j] = to_add[j];
+        }
+    }
+    bytes
+}
+
+// each character of a string is converted into a byte
+// then an ACVM field via the oracle => we recreate here
+pub fn str_to_be_bytes_arr<let L: u32>(string: str<L>) -> [u8; L * 32] {
+    let chars_bytes: [u8; L] = string.as_bytes();
+    let mut bytes = [0 as u8; L * 32];
+    for i in 0..L {
+        let to_add: [u8; 32] = (chars_bytes[i] as Field).to_be_bytes();
+        for j in 0..32 {
+            bytes[i * 32 + j] = to_add[j];
+        }
+    }
+    bytes
+}