add `from_bytes` for conversions from `[u8; 32]`

The function is `const`, so it is fundamentally different from the
`From` trait implementation by allowing compile-time instantiation of a
`Hash`.

1 files changed, 25 insertions, 0 deletions

diff --git a/src/test.rs b/src/test.rs
index 4b6272c..f5b3462 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -603,3 +603,28 @@ fn test_issue_206_windows_sse2() {
         assert_eq!(crate::Hasher::new().update(input).finalize(), expected_hash);
     }
 }
+
+#[test]
+fn test_hash_conversions() {
+    let bytes1 = [42; 32];
+    let hash1: crate::Hash = bytes1.into();
+    let bytes2: [u8; 32] = hash1.into();
+    assert_eq!(bytes1, bytes2);
+
+    let bytes3 = *hash1.as_bytes();
+    assert_eq!(bytes1, bytes3);
+
+    let hash2 = crate::Hash::from_bytes(bytes1);
+    assert_eq!(hash1, hash2);
+
+    let hex = hash1.to_hex();
+    let hash3 = crate::Hash::from_hex(hex.as_bytes()).unwrap();
+    assert_eq!(hash1, hash3);
+}
+
+#[test]
+const fn test_hash_const_conversions() {
+    let bytes = [42; 32];
+    let hash = crate::Hash::from_bytes(bytes);
+    _ = hash.as_bytes();
+}