/*
========================================================================
Routine Description:
HMAC using MD5 hash function
Arguments:
key Secret key
key_len The length of the key in bytes
message Message context
message_len The length of message in bytes
macLen Request the length of message authentication code
Return Value:
mac Message authentication code
Note:
None
========================================================================
*/
void RT_HMAC_MD5(
IN const u8 Key[],
IN UINT KeyLen,
IN const u8 Message[],
IN UINT MessageLen,
OUT u8 MAC[],
IN UINT MACLen)
{
MD5_CTX_STRUC md5_ctx1;
MD5_CTX_STRUC md5_ctx2;
u8 K0[MD5_BLOCK_SIZE];
u8 Digest[MD5_DIGEST_SIZE];
UINT index;
memset(&md5_ctx1, 0, sizeof(MD5_CTX_STRUC));
memset(&md5_ctx2, 0, sizeof(MD5_CTX_STRUC));
/*
* If the length of K = B(Block size): K0 = K.
* If the length of K > B: hash K to obtain an L byte string,
* then append (B-L) zeros to create a B-byte string K0 (i.e., K0 = H(K) || 00...00).
* If the length of K < B: append zeros to the end of K to create a B-byte string K0
*/
memset(K0, 0, MD5_BLOCK_SIZE);
if (KeyLen <= MD5_BLOCK_SIZE) {
memmove(K0, Key, KeyLen);
} else {
RT_MD5(Key, KeyLen, K0);
}
/* Exclusive-Or K0 with ipad */
/* ipad: Inner pad; the byte x・36・ repeated B times. */
for (index = 0; index < MD5_BLOCK_SIZE; index++)
K0[index] ^= 0x36;
/* End of for */
RT_MD5_Init(&md5_ctx1);
/* H(K0^ipad) */
RT_MD5_Append(&md5_ctx1, K0, sizeof(K0));
/* H((K0^ipad)||text) */
RT_MD5_Append(&md5_ctx1, Message, MessageLen);
RT_MD5_End(&md5_ctx1, Digest);
/* Exclusive-Or K0 with opad and remove ipad */
/* opad: Outer pad; the byte x・5c・ repeated B times. */
for (index = 0; index < MD5_BLOCK_SIZE; index++)
K0[index] ^= 0x36^0x5c;
/* End of for */
RT_MD5_Init(&md5_ctx2);
/* H(K0^opad) */
RT_MD5_Append(&md5_ctx2, K0, sizeof(K0));
/* H( (K0^opad) || H((K0^ipad)||text) ) */
RT_MD5_Append(&md5_ctx2, Digest, MD5_DIGEST_SIZE);
RT_MD5_End(&md5_ctx2, Digest);
if (MACLen > MD5_DIGEST_SIZE)
memmove(MAC, Digest, MD5_DIGEST_SIZE);
else
memmove(MAC, Digest, MACLen);
} /* End of RT_HMAC_SHA256 */
/*
========================================================================
Routine Description:
MD5 algorithm
Arguments:
message Message context
messageLen The length of message in bytes
Return Value:
digestMessage Digest message
Note:
None
========================================================================
*/
VOID RT_MD5 (
IN const UINT8 Message[],
IN UINT MessageLen,
OUT UINT8 DigestMessage[])
{
MD5_CTX_STRUC md5_ctx;
NdisZeroMemory(&md5_ctx, sizeof(MD5_CTX_STRUC));
RT_MD5_Init(&md5_ctx);
RT_MD5_Append(&md5_ctx, Message, MessageLen);
RT_MD5_End(&md5_ctx, DigestMessage);
} /* End of RT_MD5 */
