From f13bd04fadbad97c7087703ce548cf8c674a23a5 Mon Sep 17 00:00:00 2001
From: "Charles E. Lehner" <charles.lehner@spruceid.com>
Date: Fri, 11 Mar 2022 13:35:49 -0500
Subject: [PATCH] Constrain signature to be referencable as bytes

---
 src/lib.rs | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 87d79c3..002699e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -87,10 +87,23 @@ pub enum VerificationError {
     NotCurrentlyValid,
 }
 
-pub struct BasicSignature<S> {
+pub struct BasicSignature<S: AsRef<[u8]> + TryFrom<Vec<u8>>> {
     pub s: S,
 }
 
+impl<S: AsRef<[u8]> + TryFrom<Vec<u8>>> AsRef<[u8]> for BasicSignature<S> {
+    fn as_ref(&self) -> &[u8] {
+        self.s.as_ref()
+    }
+}
+
+impl<S: AsRef<[u8]> + TryFrom<Vec<u8>>> TryFrom<Vec<u8>> for BasicSignature<S> {
+    type Error = <S as TryFrom<Vec<u8>>>::Error;
+    fn try_from(s: Vec<u8>) -> Result<Self, Self::Error> {
+        Ok(Self { s: s.try_into()? })
+    }
+}
+
 #[derive(Copy, Clone)]
 pub enum Version {
     V1 = 1,