blob: fa4c1e6ff033b30f779bc7abc313e7bfb4eb4156 [file] [log] [blame]
/* 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