/* 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;
}