X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fcrypto%2Fhmac_sha256%2Fhmac_sha256.c;fp=ccan%2Fcrypto%2Fhmac_sha256%2Fhmac_sha256.c;h=2238f9dc8fffbd4ee049ec8c965e0c11aeef37e2;hb=9e800830de8a9bbb9f103f120ea7de9220b6869d;hp=0392afe5c1127134e61e48d864dffe94252aeaa8;hpb=e46957c87a57ff2efd0b23e230599cce529f1f92;p=ccan

diff --git a/ccan/crypto/hmac_sha256/hmac_sha256.c b/ccan/crypto/hmac_sha256/hmac_sha256.c
index 0392afe5..2238f9dc 100644
--- a/ccan/crypto/hmac_sha256/hmac_sha256.c
+++ b/ccan/crypto/hmac_sha256/hmac_sha256.c
@@ -35,7 +35,8 @@ void hmac_sha256_init(struct hmac_sha256_ctx *ctx,
 	 *  (e.g., if K is of length 20 bytes and B=64, then K will be
 	 *   appended with 44 zero bytes 0x00)
 	 */
-	memcpy(k_ipad, k, ksize);
+	if (ksize != 0)
+		memcpy(k_ipad, k, ksize);
 	memset((char *)k_ipad + ksize, 0, HMAC_SHA256_BLOCKSIZE - ksize);
 
 	/*