der_decode_boolean.c

全功能的加密库

/* 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://libtom.org
 */
#include "tomcrypt.h"

/**
  @file der_decode_boolean.c
  ASN.1 DER, decode a BOOLEAN, Tom St Denis
*/


#ifdef LTC_DER

/**
  Read a BOOLEAN
  @param in      The destination for the DER encoded BOOLEAN
  @param inlen   The size of the DER BOOLEAN
  @param out     [out]  The boolean to decode
  @return CRYPT_OK if successful
*/
int der_decode_boolean(const unsigned char *in, unsigned long inlen,
                                       int *out)
{
   LTC_ARGCHK(in  != NULL);
   LTC_ARGCHK(out != NULL);
   
   if (inlen != 3 || in[0] != 0x01 || in[1] != 0x01 || (in[2] != 0x00 && in[2] != 0xFF)) {
      return CRYPT_INVALID_ARG;
   }
   
   *out = (in[2]==0xFF) ? 1 : 0;
   
   return CRYPT_OK;
}

#endif

/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/boolean/der_decode_boolean.c,v $ */
/* $Revision: 1.2 $ */
/* $Date: 2006/12/28 01:27:24 $ */