diff options
Diffstat (limited to 'crypto/hmac/hmac.c')
| -rw-r--r-- | crypto/hmac/hmac.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/crypto/hmac/hmac.c b/crypto/hmac/hmac.c index 0a3b09fadb..f372955c60 100644 --- a/crypto/hmac/hmac.c +++ b/crypto/hmac/hmac.c @@ -248,11 +248,18 @@ unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, { HMAC_CTX *c = NULL; static unsigned char m[EVP_MAX_MD_SIZE]; + static const unsigned char dummy_key[1] = {'\0'}; if (md == NULL) md = m; if ((c = HMAC_CTX_new()) == NULL) goto err; + + /* For HMAC_Init_ex, NULL key signals reuse. */ + if (key == NULL && key_len == 0) { + key = dummy_key; + } + if (!HMAC_Init_ex(c, key, key_len, evp_md, NULL)) goto err; if (!HMAC_Update(c, d, n)) |