/* 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>/**   @file omac_memory_multi.c  LTC_OMAC1 support, process multiple blocks of memory, Tom St Denis*/#ifdef LTC_OMAC/**   LTC_OMAC multiple blocks 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 out       [out] The destination of the authentication tag   @param outlen    [in/out]  The max size and resulting size of the authentication tag (octets)   @param in        The data to send through LTC_OMAC   @param inlen     The length of the data to send through LTC_OMAC (octets)   @param ...       tuples of (data,len) pairs to LTC_OMAC, terminated with a (NULL,x) (x=don't care)   @return CRYPT_OK if successful*/int omac_memory_multi(int cipher,                 const unsigned char *key, unsigned long keylen,                      unsigned char *out, unsigned long *outlen,                const unsigned char *in,  unsigned long inlen, ...){   int                  err;   omac_state          *omac;   va_list              args;   const unsigned char *curptr;   unsigned long        curlen;   LTC_ARGCHK(key    != NULL);   LTC_ARGCHK(in     != NULL);   LTC_ARGCHK(out    != NULL);   LTC_ARGCHK(outlen != NULL);   /* 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;   }   va_start(args, inlen);   curptr = in;    curlen = inlen;   for (;;) {      /* process buf */      if ((err = omac_process(omac, curptr, curlen)) != CRYPT_OK) {         goto LBL_ERR;      }      /* step to next */      curptr = va_arg(args, const unsigned char*);      if (curptr == NULL) {         break;      }      curlen = va_arg(args, unsigned long);   }   if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {      goto LBL_ERR;   }LBL_ERR:#ifdef LTC_CLEAN_STACK   zeromem(omac, sizeof(omac_state));#endif   XFREE(omac);   va_end(args);   return err;   }#endif/* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_memory_multi.c,v $ *//* $Revision: 1.7 $ *//* $Date: 2007/05/12 14:37:41 $ */