/* 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://libtomcrypt.com */#include "tomcrypt.h"/**   @file omac_memory.c  OMAC1 support, process a block of memory, Tom St Denis*/#ifdef LTC_OMAC/**   OMAC a block 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 in        The data to send through OMAC   @param inlen     The length of the data to send through OMAC (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)   @return CRYPT_OK if successful*/int omac_memory(int cipher,                 const unsigned char *key, unsigned long keylen,                const unsigned char *in,  unsigned long inlen,                      unsigned char *out, unsigned long *outlen){   int err;   omac_state *omac;   LTC_ARGCHK(key    != NULL);   LTC_ARGCHK(in     != NULL);   LTC_ARGCHK(out    != NULL);   LTC_ARGCHK(outlen != NULL);   /* is the cipher valid? */   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {      return err;   }   /* Use accelerator if found */   if (cipher_descriptor[cipher].omac_memory != NULL) {      return cipher_descriptor[cipher].omac_memory(key, keylen, in, inlen, out, outlen);   }   /* allocate ram for omac state */   omac = XMALLOC(sizeof(omac_state));   if (omac == NULL) {      return CRYPT_MEM;   }   /* omac process the message */   if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {      goto LBL_ERR;   }   if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) {      goto LBL_ERR;   }   if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {      goto LBL_ERR;   }   err = CRYPT_OK;LBL_ERR:#ifdef LTC_CLEAN_STACK   zeromem(omac, sizeof(omac_state));#endif   XFREE(omac);   return err;   }#endif/* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_memory.c,v $ *//* $Revision: 1.6 $ *//* $Date: 2006/11/08 23:01:06 $ */