feedc0de/wolfssl
1
0
Fork 0
forked from wolfSSL/wolfssl
Code Pull Requests Activity

FIPS Revalidation

Browse Source 
1. Updated CMAC to allow tag length from 4 to 16 bytes, inclusive.
This commit is contained in:
John Safranek
2018-02-07 10:34:46 -08:00
parent aa968eac98
commit eb1a76bf2a
2 changed files with 8 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
wolfcrypt/src/cmac.c
View File

@ -129,10 +129,10 @@ int wc_CmacFinal(Cmac* cmac, byte* out, word32* outSz)
{
const byte* subKey;
if (cmac == NULL || out == NULL)
if (cmac == NULL || out == NULL || outSz == NULL)
return BAD_FUNC_ARG;
if (outSz != NULL && *outSz < AES_BLOCK_SIZE)
if (*outSz < WC_CMAC_TAG_MIN_SZ || *outSz > WC_CMAC_TAG_MAX_SZ)
return BUFFER_E;
if (cmac->bufferSz == AES_BLOCK_SIZE) {
@ -151,10 +151,10 @@ int wc_CmacFinal(Cmac* cmac, byte* out, word32* outSz)
}
xorbuf(cmac->buffer, cmac->digest, AES_BLOCK_SIZE);
xorbuf(cmac->buffer, subKey, AES_BLOCK_SIZE);
wc_AesEncryptDirect(&cmac->aes, out, cmac->buffer);
wc_AesEncryptDirect(&cmac->aes, cmac->digest, cmac->buffer);
XMEMCPY(out, cmac->digest, *outSz);
if (outSz != NULL)
*outSz = AES_BLOCK_SIZE;
ForceZero(cmac, sizeof(Cmac));
return 0;

3
wolfssl/wolfcrypt/cmac.h
View File

@ -56,6 +56,9 @@ typedef enum CmacType {
WC_CMAC_AES = 1
} CmacType;
#define WC_CMAC_TAG_MAX_SZ AES_BLOCK_SIZE
#define WC_CMAC_TAG_MIN_SZ (AES_BLOCK_SIZE/4)
#endif /* HAVE_FIPS */
WOLFSSL_API