From d8e821bae9e2496f312fc0f2742c5a55b8ce50c6 Mon Sep 17 00:00:00 2001
From: Ivan Nikulin <inikulin@cloudflare.com>
Date: Fri, 28 Jun 2024 10:26:50 +0100
Subject: [PATCH] Expose hmac_sha1 function

---
 boring/src/hash.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/boring/src/hash.rs b/boring/src/hash.rs
index 1b499e38..76167723 100644
--- a/boring/src/hash.rs
+++ b/boring/src/hash.rs
@@ -344,6 +344,11 @@ pub fn hmac_sha512(key: &[u8], data: &[u8]) -> Result<[u8; 64], ErrorStack> {
     hmac(MessageDigest::sha512(), key, data)
 }
 
+/// Computes HMAC with SHA-1 digest.
+pub fn hmac_sha1(key: &[u8], data: &[u8]) -> Result<[u8; 20], ErrorStack> {
+    hmac(MessageDigest::sha1(), key, data)
+}
+
 fn hmac<const N: usize>(
     digest: MessageDigest,
     key: &[u8],
@@ -437,6 +442,19 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_hmac_sha1() {
+        let hmac = hmac_sha1(b"That's a secret".as_slice(), b"Hello world!".as_slice()).unwrap();
+
+        assert_eq!(
+            hmac,
+            [
+                0xe1, 0x06, 0x76, 0x46, 0x3b, 0x82, 0x67, 0xa1, 0xae, 0xe5, 0x1c, 0xfa, 0xee, 0x36,
+                0x1d, 0x4b, 0xd4, 0x41, 0x6e, 0x37
+            ]
+        );
+    }
+
     #[test]
     fn test_md5() {
         for test in MD5_TESTS.iter() {