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sanity check for RSA key size and hash digest size

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This commit is contained in:
Jacob Barthelmeh
2016-03-16 15:25:52 -06:00
parent 4c3ddac23c
commit 2dd5efd969
1 changed files with 12 additions and 3 deletions
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15
wolfcrypt/src/rsa.c
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@ -427,10 +427,19 @@ static int wc_RsaPad_OAEP(const byte* input, word32 inputLen, byte* pkcsBlock,
size aproaches 0. In decryption if k is less than or equal -- then there
is no possible room for msg.
k = RSA key size
hLen = hash digest size
hLen = hash digest size -- will always be >= 0 at this point
*/
if ((int)inputLen > ((int)pkcsBlockLen - 2 * hLen - 2)) {
WOLFSSL_MSG("OAEP pad error, message too long or hash to big for RSA key size");
if ((word32)(2 * hLen + 2) > pkcsBlockLen) {
WOLFSSL_MSG("OAEP pad error hash to big for RSA key size");
#ifdef WOLFSSL_SMALL_STACK
XFREE(lHash, NULL, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(seed, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return BAD_FUNC_ARG;
}
if (inputLen > (pkcsBlockLen - 2 * hLen - 2)) {
WOLFSSL_MSG("OAEP pad error message too long");
#ifdef WOLFSSL_SMALL_STACK
XFREE(lHash, NULL, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(seed, NULL, DYNAMIC_TYPE_TMP_BUFFER);