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      1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
      2  *
      3  * LibTomCrypt is a library that provides various cryptographic
      4  * algorithms in a highly modular and flexible manner.
      5  *
      6  * The library is free for all purposes without any express
      7  * guarantee it works.
      8  *
      9  * Tom St Denis, tomstdenis (at) gmail.com, http://libtomcrypt.com
     10  */
     11 #include "tomcrypt.h"
     12 
     13 /**
     14   @file der_decode_boolean.c
     15   ASN.1 DER, decode a BOOLEAN, Tom St Denis
     16 */
     17 
     18 
     19 #ifdef LTC_DER
     20 
     21 /**
     22   Read a BOOLEAN
     23   @param in      The destination for the DER encoded BOOLEAN
     24   @param inlen   The size of the DER BOOLEAN
     25   @param out     [out]  The boolean to decode
     26   @return CRYPT_OK if successful
     27 */
     28 int der_decode_boolean(const unsigned char *in, unsigned long inlen,
     29                                        int *out)
     30 {
     31    LTC_ARGCHK(in  != NULL);
     32    LTC_ARGCHK(out != NULL);
     33 
     34    if (inlen != 3 || in[0] != 0x01 || in[1] != 0x01 || (in[2] != 0x00 && in[2] != 0xFF)) {
     35       return CRYPT_INVALID_ARG;
     36    }
     37 
     38    *out = (in[2]==0xFF) ? 1 : 0;
     39 
     40    return CRYPT_OK;
     41 }
     42 
     43 #endif
     44 
     45 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/boolean/der_decode_boolean.c,v $ */
     46 /* $Revision: 1.1 $ */
     47 /* $Date: 2006/04/22 17:01:59 $ */
     48