fixup! Add Hash type for safe crypto fns and use it on Auth

soroban-sdk/src/crypto.rs

@@ -1,8 +1,20 @@
 //! Crypto contains functions for cryptographic functions.
-use crate::{env::internal, unwrap::UnwrapInfallible, Bytes, BytesN, Env};
+use crate::{env::internal, unwrap::UnwrapInfallible, Bytes, BytesN, Env, IntoVal, Val};
 
 pub struct Hash<const N: usize>(BytesN<N>);
 
+impl<const N: usize> IntoVal<Env, Val> for Hash<N> {
+    fn into_val(&self, e: &Env) -> Val {
+        self.0.into_val(e)
+    }
+}
+
+impl<const N: usize> IntoVal<Env, BytesN<N>> for Hash<N> {
+    fn into_val(&self, _e: &Env) -> BytesN<N> {
+        self.0.clone()
+    }
+}
+
 impl<const N: usize> Into<BytesN<N>> for Hash<N> {
     fn into(self) -> BytesN<N> {
         self.0