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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>
#include <ncr-int.h>
#include <cryptodev_int.h>
/**
@file hash_memory_multi.c
Hash (multiple buffers) memory helper, Tom St Denis
*/
/**
Hash multiple (non-adjacent) blocks of memory at once.
@param hash The hash you wish to use
@param out [out] Where to store the digest
@param outlen [in/out] Max size and resulting size of the digest
@param in The data you wish to hash
@param inlen The length of the data to hash (octets)
@param ... tuples of (data,len) pairs to hash, terminated with a (NULL,x) (x=don't care)
@return CRYPT_OK if successful
*/
int hash_memory_multi(const struct algo_properties_st *hash, unsigned char *out,
unsigned long *outlen, const unsigned char *in,
unsigned long inlen, ...)
{
struct hash_data hdata;
int err;
va_list args;
const unsigned char *curptr;
unsigned long curlen;
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
if ((err = hash_is_valid(hash)) != CRYPT_OK) {
return err;
}
if (*outlen < hash->digest_size) {
*outlen = hash->digest_size;
return CRYPT_BUFFER_OVERFLOW;
}
err = cryptodev_hash_init(&hdata, hash->kstr, NULL, 0);
if (err < 0) {
err = CRYPT_INVALID_HASH;
goto LBL_ERR;
}
va_start(args, inlen);
curptr = in;
curlen = inlen;
for (;;) {
/* process buf */
if ((err = _cryptodev_hash_update(&hdata, curptr, curlen)) < 0) {
err = CRYPT_ERROR;
goto LBL_ERR;
}
/* step to next */
curptr = va_arg(args, const unsigned char *);
if (curptr == NULL) {
break;
}
curlen = va_arg(args, unsigned long);
}
err = cryptodev_hash_final(&hdata, out);
*outlen = hash->digest_size;
LBL_ERR:
cryptodev_hash_deinit(&hdata);
va_end(args);
return err;
}
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