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ThresholdRSA.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: ThresholdRSA.cc,v 1.3 2004/05/19 15:57:00 mmarsh Exp $
//
// $Log: ThresholdRSA.cc,v $
// Revision 1.3  2004/05/19 15:57:00  mmarsh
// *** empty log message ***
//
// Revision 1.2  2003/11/04 22:21:34  mmarsh
// General code cleanup.
//
//

#include "ThresholdRSA.h"

using namespace CODEX_ThresholdCrypto;

ThresholdRSARange::ThresholdRSARange( const BIGNUM * modulus,
                                      unsigned int n ) :
   m_min( 0 ),
   m_max( 0 )
{
   BN_CTX * ctx = 0;
   BIGNUM * bnz = 0;
   try
   {
      ctx = BN_CTX_new();
      if ( 0 == ctx )
      {
         throw CODEX_Exceptions::BignumContextException( __FILE__ , __LINE__ );
      }
      m_max = BN_new();
      if ( 0 == m_max )
      {
         throw CODEX_Exceptions::BignumNullException( __FILE__ , __LINE__ );
      }
      CODEX_ASN1::Integer iNum( n );
      CODEX_ASN1::BigNumber bnNum( iNum.asn1() );
      if ( ! BN_sqr( m_max, modulus, ctx ) )
      {
         throw CODEX_Exceptions::BignumMulException( __FILE__ , __LINE__ );
      }
      if ( ! BN_mul( m_max, m_max, bnNum.value(), ctx ) )
      {
         throw CODEX_Exceptions::BignumMulException( __FILE__ , __LINE__ );
      }

      bnz = BN_new();
      if ( 0 == bnz )
      {
         throw CODEX_Exceptions::BignumNullException( __FILE__ , __LINE__ );
      }
      if ( ! BN_zero(bnz) )
      {
         throw CODEX_Exceptions::BignumSetWordException( __FILE__ , __LINE__ );
      }
      m_min = BN_new();
      if ( 0 == m_min )
      {
         throw CODEX_Exceptions::BignumNullException( __FILE__ , __LINE__ );
      }
      if ( ! BN_sub( m_min, bnz, m_max ) )
      {
         throw CODEX_Exceptions::BignumSubException( __FILE__ , __LINE__ );
      }
      BN_free(bnz);
      BN_CTX_free(ctx);
   }
   catch ( ... )
   {
      if ( 0 != ctx ) BN_CTX_free( ctx );
      if ( 0 != m_min ) BN_free( m_min );
      if ( 0 != m_max ) BN_free( m_max );
      if ( 0 != bnz ) BN_free( bnz );
      throw;
   }
}

ThresholdRSARange::~ThresholdRSARange()
{
   if ( 0 != m_min ) BN_free( m_min );
   if ( 0 != m_max ) BN_free( m_max );
}

ThresholdRSASubRange::ThresholdRSASubRange( const BIGNUM * modulus ) :
   ThresholdRSARange( modulus, 1 )
{
}

ThresholdRSASubRange::~ThresholdRSASubRange()
{
}

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