From: Russ Cox <rsc@golang.org>
Date: Mon, 28 Aug 2017 18:26:31 +0000 (-0400)
Subject: [dev.boringcrypto] crypto/internal/boring: fix NewHMAC with empty key
X-Git-Tag: go1.19beta1~484^2~179
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=f6358bdb6ca21b93313f98e3963229aedd043fe8;p=gostls13.git

[dev.boringcrypto] crypto/internal/boring: fix NewHMAC with empty key

Test is in a separate CL for easier cherry-picking to master branch.

Change-Id: Ia4a9032892d2896332010fe18a3216f8c4a58d1c
Reviewed-on: https://go-review.googlesource.com/59770
Reviewed-by: Adam Langley <agl@golang.org>
---

diff --git a/src/crypto/internal/boring/hmac.go b/src/crypto/internal/boring/hmac.go
index a547438222..3757da6805 100644
--- a/src/crypto/internal/boring/hmac.go
+++ b/src/crypto/internal/boring/hmac.go
@@ -100,7 +100,7 @@ func (h *boringHMAC) Reset() {
 	}
 	C._goboringcrypto_HMAC_CTX_init(&h.ctx)
 
-	if C._goboringcrypto_HMAC_Init(&h.ctx, unsafe.Pointer(&h.key[0]), C.int(len(h.key)), h.md) == 0 {
+	if C._goboringcrypto_HMAC_Init(&h.ctx, unsafe.Pointer(base(h.key)), C.int(len(h.key)), h.md) == 0 {
 		panic("boringcrypto: HMAC_Init failed")
 	}
 	if int(C._goboringcrypto_HMAC_size(&h.ctx)) != h.size {