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/* 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@gmail.com, http://libtomcrypt.com
*/
#include "tomcrypt.h"
#include <stdarg.h>
/**
@file pmac_memory_multi.c
PMAC implementation, process multiple blocks of memory, by Tom St Denis
*/
#ifdef LTC_PMAC
/**
PMAC multiple blocks of memory
@param cipher The index of the cipher desired
@param key The secret key
@param keylen The length of the secret key (octets)
@param out [out] Destination for the authentication tag
@param outlen [in/out] The max size and resulting size of the authentication tag
@param in The data you wish to send through PMAC
@param inlen The length of data you wish to send through PMAC (octets)
@param ... tuples of (data,len) pairs to PMAC, terminated with a (NULL,x) (x=don't care)
@return CRYPT_OK if successful
*/
int pmac_memory_multi(int cipher,
const unsigned char *key, unsigned long keylen,
unsigned char *out, unsigned long *outlen,
const unsigned char *in, unsigned long inlen, ...)
{
int err;
pmac_state *pmac;
va_list args;
const unsigned char *curptr;
unsigned long curlen;
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
/* allocate ram for pmac state */
pmac = XMALLOC(sizeof(pmac_state));
if (pmac == NULL) {
return CRYPT_MEM;
}
if ((err = pmac_init(pmac, cipher, key, keylen)) != CRYPT_OK) {
goto LBL_ERR;
}
va_start(args, inlen);
curptr = in;
curlen = inlen;
for (;;) {
/* process buf */
if ((err = pmac_process(pmac, curptr, curlen)) != CRYPT_OK) {
goto LBL_ERR;
}
/* step to next */
curptr = va_arg(args, const unsigned char*);
if (curptr == NULL) {
break;
}
curlen = va_arg(args, unsigned long);
}
if ((err = pmac_done(pmac, out, outlen)) != CRYPT_OK) {
goto LBL_ERR;
}
LBL_ERR:
#ifdef LTC_CLEAN_STACK
zeromem(pmac, sizeof(pmac_state));
#endif
XFREE(pmac);
va_end(args);
return err;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_memory_multi.c,v $ */
/* $Revision: 1.6 $ */
/* $Date: 2006/11/03 00:39:49 $ */
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