49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
|
|
*
|
|
* LibTomCrypt is a library that provides various cryptographic
|
|
* algorithms in a highly modular and flexible manner.
|
|
*
|
|
* The library is free for all purposes without any express
|
|
* guarantee it works.
|
|
*
|
|
* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
|
|
*/
|
|
/* Submited by Dobes Vandermeer (dobes@smartt.com) */
|
|
|
|
#include "mycrypt.h"
|
|
|
|
/*
|
|
(1) append zeros to the end of K to create a B byte string
|
|
(e.g., if K is of length 20 bytes and B=64, then K will be
|
|
appended with 44 zero bytes 0x00)
|
|
(2) XOR (bitwise exclusive-OR) the B byte string computed in step
|
|
(1) with ipad (ipad = the byte 0x36 repeated B times)
|
|
(3) append the stream of data 'text' to the B byte string resulting
|
|
from step (2)
|
|
(4) apply H to the stream generated in step (3)
|
|
(5) XOR (bitwise exclusive-OR) the B byte string computed in
|
|
step (1) with opad (opad = the byte 0x5C repeated B times.)
|
|
(6) append the H result from step (4) to the B byte string
|
|
resulting from step (5)
|
|
(7) apply H to the stream generated in step (6) and output
|
|
the result
|
|
*/
|
|
|
|
#ifdef HMAC
|
|
|
|
#define HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
|
|
|
|
int hmac_process(hmac_state *hmac, const unsigned char *buf, unsigned long len)
|
|
{
|
|
int err;
|
|
_ARGCHK(hmac != NULL);
|
|
_ARGCHK(buf != NULL);
|
|
if ((err = hash_is_valid(hmac->hash)) != CRYPT_OK) {
|
|
return err;
|
|
}
|
|
return hash_descriptor[hmac->hash].process(&hmac->md, buf, len);
|
|
}
|
|
|
|
#endif
|
|
|