/* 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].blocksizeint 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