omac_memory.c

来自「常用的64位密码加密算法」· C语言 代码 · 共 43 行

/* 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, [e-mail], http://libtomcrypt.org
 */
/* OMAC1 Support by Tom St Denis (for 64 and 128 bit block ciphers only) */
#include "mycrypt.h"

#ifdef OMAC

int omac_memory(int cipher, 
                const unsigned char *key, unsigned long keylen,
                const unsigned char *msg, unsigned long msglen,
                      unsigned char *out, unsigned long *outlen)
{
   int err;
   omac_state omac;

   _ARGCHK(key != NULL);
   _ARGCHK(msg != NULL);
   _ARGCHK(out != NULL);
   _ARGCHK(outlen != NULL);

   if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
      return err;
   }
   if ((err = omac_process(&omac, msg, msglen)) != CRYPT_OK) {
      return err;
   }
   if ((err = omac_done(&omac, out, outlen)) != CRYPT_OK) {
      return err;
   }

   return CRYPT_OK;
}

#endif