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Constant compare the HMAC result when using NULL cipher and TLS 1.3

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This commit is contained in:
Sean Parkinson
2019-08-09 11:50:07 -06:00
parent 51dfc35aac
commit dd48c825ed
1 changed files with 1 additions and 1 deletions
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2
src/tls13.c
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@ -1935,7 +1935,7 @@ static int Tls13IntegrityOnly_Decrypt(WOLFSSL* ssl, byte* output,
if (ret == 0)
ret = wc_HmacFinal(ssl->decrypt.hmac, hmac);
/* Check authentication tag matches */
if (ret == 0 && XMEMCMP(tagIn, hmac, ssl->specs.hash_size) != 0)
if (ret == 0 && ConstantCompare(tagIn, hmac, ssl->specs.hash_size) != 0)
ret = DECRYPT_ERROR;
/* Copy the input to output if not the same buffer */
if (ret == 0 && output != input)