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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://libtom.org
*/
#include "tomcrypt.h"
#include <stdarg.h>
/**
@file xcbc_memory_multi.c
XCBC support, process multiple blocks of memory, Tom St Denis
*/
#ifdef LTC_XCBC
/**
XCBC multiple blocks of memory
@param cipher The index of the desired cipher
@param key The secret key
@param keylen The length of the secret key (octets)
@param out [out] The destination of the authentication tag
@param outlen [in/out] The max size and resulting size of the authentication tag (octets)
@param in The data to send through XCBC
@param inlen The length of the data to send through XCBC (octets)
@param ... tuples of (data,len) pairs to XCBC, terminated with a (NULL,x) (x=don't care)
@return CRYPT_OK if successful
*/
int xcbc_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;
xcbc_state *xcbc;
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 xcbc state */
xcbc = XMALLOC(sizeof(xcbc_state));
if (xcbc == NULL) {
return CRYPT_MEM;
}
/* xcbc process the message */
if ((err = xcbc_init(xcbc, cipher, key, keylen)) != CRYPT_OK) {
goto LBL_ERR;
}
va_start(args, inlen);
curptr = in;
curlen = inlen;
for (;;) {
/* process buf */
if ((err = xcbc_process(xcbc, 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 = xcbc_done(xcbc, out, outlen)) != CRYPT_OK) {
goto LBL_ERR;
}
LBL_ERR:
#ifdef LTC_CLEAN_STACK
zeromem(xcbc, sizeof(xcbc_state));
#endif
XFREE(xcbc);
va_end(args);
return err;
}
#endif
/* $Source$ */
/* $Revision$ */
/* $Date$ */
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