/* 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"#include <stdarg.h>/**  @file hmac_memory_multi.c  HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer*/#ifdef LTC_HMAC/**   HMAC multiple blocks of memory to produce the authentication tag   @param hash      The index of the hash to use    @param key       The secret key    @param keylen    The length of the secret key (octets)   @param out       [out] Destination of the authentication tag   @param outlen    [in/out] Max size and resulting size of authentication tag   @param in        The data to HMAC   @param inlen     The length of the data to HMAC (octets)   @param ...       tuples of (data,len) pairs to HMAC, terminated with a (NULL,x) (x=don't care)   @return CRYPT_OK if successful*/int hmac_memory_multi(int hash,                 const unsigned char *key,  unsigned long keylen,                      unsigned char *out,  unsigned long *outlen,                const unsigned char *in,   unsigned long inlen, ...){    hmac_state          *hmac;    int                  err;    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 hmac state */    hmac = XMALLOC(sizeof(hmac_state));    if (hmac == NULL) {       return CRYPT_MEM;    }    if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {       goto LBL_ERR;    }    va_start(args, inlen);    curptr = in;     curlen = inlen;    for (;;) {       /* process buf */       if ((err = hmac_process(hmac, 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 = hmac_done(hmac, out, outlen)) != CRYPT_OK) {       goto LBL_ERR;    }LBL_ERR:#ifdef LTC_CLEAN_STACK   zeromem(hmac, sizeof(hmac_state));#endif   XFREE(hmac);   va_end(args);   return err;   }#endif/* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_memory_multi.c,v $ *//* $Revision: 1.5 $ *//* $Date: 2006/11/03 00:39:49 $ */