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