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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.
*/
#include "tomcrypt.h"
#include <stdarg.h>
#ifdef LTC_BLAKE2SMAC
/**
BLAKE2S MAC multiple blocks of memory to produce the authentication tag
@param key The secret key
@param keylen The length of the secret key (octets)
@param mac [out] Destination of the authentication tag
@param maclen [in/out] Max size and resulting size of authentication tag
@param in The data to BLAKE2S MAC
@param inlen The length of the data to BLAKE2S MAC (octets)
@param ... tuples of (data,len) pairs to BLAKE2S MAC, terminated with a (NULL,x) (x=don't care)
@return CRYPT_OK if successful
*/
int blake2smac_memory_multi(const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen, const unsigned char *in, unsigned long inlen, ...)
{
blake2smac_state st;
int err;
va_list args;
const unsigned char *curptr;
unsigned long curlen;
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(mac != NULL);
LTC_ARGCHK(maclen != NULL);
va_start(args, inlen);
curptr = in;
curlen = inlen;
if ((err = blake2smac_init(&st, *maclen, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
for (;;) {
if ((err = blake2smac_process(&st, curptr, curlen)) != CRYPT_OK) { goto LBL_ERR; }
curptr = va_arg(args, const unsigned char*);
if (curptr == NULL) break;
curlen = va_arg(args, unsigned long);
}
err = blake2smac_done(&st, mac, maclen);
LBL_ERR:
#ifdef LTC_CLEAN_STACK
zeromem(&st, sizeof(blake2smac_state));
#endif
va_end(args);
return err;
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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