ElGamalSignature.cc

/*
 * Copyright 2003 Michael A. Marsh, Cornell University. All rights reserved.
 * This software is released under the modified BSD license.
 * See the file LICENSE in the top-level directory for details.
 */
//
// $Id: ElGamalSignature.cc,v 1.3 2004/05/19 15:56:47 mmarsh Exp $
//
// $Log: ElGamalSignature.cc,v $
// Revision 1.3  2004/05/19 15:56:47  mmarsh
// *** empty log message ***
//
// Revision 1.2  2003/11/04 22:31:47  mmarsh
// *** empty log message ***
//
//

#include "ElGamal.h"

using namespace CODEX_Ciphers;

ElGamalSignature::ElGamalSignature() :
   CODEX_ASN1::Base( false )
{
}

ElGamalSignature::ElGamalSignature( BIGNUM * r, BIGNUM * s ) :
   CODEX_ASN1::Base( true ),
   m_r( r ),
   m_s( s )
{
}

ElGamalSignature::ElGamalSignature( const CODEX_ASN1::BigNumber& r,
                                    const CODEX_ASN1::BigNumber& s ) :
   CODEX_ASN1::Base( true ),
   m_r( r ),
   m_s( s )
{
}

ElGamalSignature::ElGamalSignature( const ElGamalSignature& aSig ) :
   CODEX_ASN1::Base( aSig.m_initialized ),
   m_r( aSig.m_r ),
   m_s( aSig.m_s )
{
}

ElGamalSignature::~ElGamalSignature()
{
}

void
ElGamalSignature::operator=( const ElGamalSignature& aSig )
{
   m_initialized = aSig.m_initialized;
   m_r           = aSig.m_r;
   m_s           = aSig.m_s;
}

int
ElGamalSignature::marshal( unsigned char ** pp ) const
{
   int r=0;
   int ret=0;
   unsigned char * p;

   ret += m_r.marshal(0);
   ret += m_s.marshal(0);
   M_ASN1_I2D_seq_total();
   m_r.marshal(&p);
   m_s.marshal(&p);
   M_ASN1_I2D_finish();
}

void*
ElGamalSignature::unmarshal( void* bogus, unsigned char ** pp, long length )
{
   if ( m_initialized )
   {
      return NULL;
   }
   if ( (NULL == pp) || (NULL == *pp) )
   {
      return NULL;
   }
   ASN1_CTX c;
   c.pp = pp;
   c.q = *pp;
   c.error = ERR_R_NESTED_ASN1_ERROR;
   int i;

   M_ASN1_D2I_Init();
   M_ASN1_D2I_start_sequence();
   M_ASN1_D2I_get(i, m_r.unmarshal);
   M_ASN1_D2I_get(i, m_s.unmarshal);
   if ( !asn1_Finish(&c) )
   {
      return NULL;
   }
   *pp=c.p;
   m_initialized = true;
   return this;
  err: // needed by ASN.1 macros
   return NULL;
}

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