own hmac, tests, pass, note origin

Copyrightwise this is fine because IETF licences code in RFCs
appropriately.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/src/utils.rs b/src/utils.rs
index 868dd1108cb26f7d204609ba76ba2619390d3ba8..8a8d0345440d28163bd4d59bcfcb6ca9dd8df666 100644 (file)
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -51,6 +51,7 @@ pub fn token_hmac(key: &[u8], message: &[u8]) -> [u8; HMAC_L] {
 
 #[test]
 fn hmac_test_vectors(){
+  // C&P from RFC 4231
   let vectors = r#"
    Key =          0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b
                   0b0b0b0b                          (20 bytes)