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92 lines
2.6 KiB
92 lines
2.6 KiB
/* 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@gmail.com, http://libtom.org
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*/
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#include "tomcrypt.h"
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#include <stdarg.h>
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/**
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@file hmac_memory_multi.c
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LTC_HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer
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*/
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#ifdef LTC_HMAC
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/**
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LTC_HMAC multiple blocks of memory to produce the authentication tag
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@param hash The index of the hash to use
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@param key The secret key
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@param keylen The length of the secret key (octets)
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@param out [out] Destination of the authentication tag
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@param outlen [in/out] Max size and resulting size of authentication tag
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@param in The data to LTC_HMAC
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@param inlen The length of the data to LTC_HMAC (octets)
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@param ... tuples of (data,len) pairs to LTC_HMAC, terminated with a (NULL,x) (x=don't care)
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@return CRYPT_OK if successful
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*/
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int hmac_memory_multi(struct ltc_hash_descriptor *hash,
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const unsigned char *key, unsigned long keylen,
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unsigned char *out, unsigned long *outlen,
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const unsigned char *in, unsigned long inlen, ...)
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{
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hmac_state *hmac;
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int err;
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va_list args;
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const unsigned char *curptr;
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unsigned long curlen;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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/* allocate ram for hmac state */
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hmac = XMALLOC(sizeof(hmac_state));
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if (hmac == NULL) {
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return CRYPT_MEM;
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}
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if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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va_start(args, inlen);
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curptr = in;
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curlen = inlen;
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for (;;) {
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/* process buf */
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if ((err = hmac_process(hmac, hash, curptr, curlen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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/* step to next */
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curptr = va_arg(args, const unsigned char*);
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if (curptr == NULL) {
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break;
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}
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curlen = va_arg(args, unsigned long);
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}
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if ((err = hmac_done(hmac, hash, out, outlen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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LBL_ERR:
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#ifdef LTC_CLEAN_STACK
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zeromem(hmac, sizeof(hmac_state));
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#endif
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XFREE(hmac);
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va_end(args);
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return err;
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}
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#endif
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/* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_memory_multi.c,v $ */
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/* $Revision: 1.7 $ */
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/* $Date: 2007/05/12 14:37:41 $ */
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