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KeyPairDSA.cs

using System;
using bareFTP.Preferences;

namespace bareFTP.Protocol.Sftp
{
      /* -*-mode:java; c-basic-offset:2; -*- */
      /*
      Copyright (c) 2002,2003,2004 ymnk, JCraft,Inc. All rights reserved.

      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions are met:

        1. Redistributions of source code must retain the above copyright notice,
             this list of conditions and the following disclaimer.

        2. Redistributions in binary form must reproduce the above copyright 
             notice, this list of conditions and the following disclaimer in 
             the documentation and/or other materials provided with the distribution.

        3. The names of the authors may not be used to endorse or promote products
             derived from this software without specific prior written permission.

      THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
      INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
      FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
      INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
      INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
      OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
      LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
      NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
      EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      */

      public class KeyPairDSA : KeyPair
      {
            private byte[] P_array;
            private byte[] Q_array;
            private byte[] G_array;
            private byte[] pub_array;
            private byte[] prv_array;

            //private int key_size=0;
            private int key_size=1024;

            public KeyPairDSA(Config conf):base(conf)
            {
            }

            internal override void generate(int key_size) 
            {
                  this.key_size=key_size;
                  try
                  {
                        KeyPairGenDSA keypairgen= new bareFTP.Protocol.Sftp.jce.KeyPairGenDSA();
                        keypairgen.init(key_size);
                        P_array=keypairgen.getP();
                        Q_array=keypairgen.getQ();
                        G_array=keypairgen.getG();
                        pub_array=keypairgen.getY();
                        prv_array=keypairgen.getX();

                        keypairgen=null;
                  }
                  catch(Exception e)
                  {
                        Console.Error.WriteLine("KeyPairDSA: "+e); 
                        throw new Exception(e.ToString());
                  }
            }

            private static byte[] begin= Util.getBytes( "-----BEGIN DSA PRIVATE KEY-----" );
            private static byte[] end=Util.getBytes("-----END DSA PRIVATE KEY-----");

            internal override byte[] getBegin(){ return begin; }
            internal override byte[] getEnd(){ return end; }

            internal override byte[] getPrivateKey()
            {
                  int content=
                        1+countLength(1) + 1 +                           // INTEGER
                        1+countLength(P_array.Length) + P_array.Length + // INTEGER  P
                        1+countLength(Q_array.Length) + Q_array.Length + // INTEGER  Q
                        1+countLength(G_array.Length) + G_array.Length + // INTEGER  G
                        1+countLength(pub_array.Length) + pub_array.Length + // INTEGER  pub
                        1+countLength(prv_array.Length) + prv_array.Length;  // INTEGER  prv

                  int total=
                        1+countLength(content)+content;   // SEQUENCE

                  byte[] plain=new byte[total];
                  int index=0;
                  index=writeSEQUENCE(plain, index, content);
                  index=writeINTEGER(plain, index, new byte[1]);  // 0
                  index=writeINTEGER(plain, index, P_array);
                  index=writeINTEGER(plain, index, Q_array);
                  index=writeINTEGER(plain, index, G_array);
                  index=writeINTEGER(plain, index, pub_array);
                  index=writeINTEGER(plain, index, prv_array);
                  return plain;
            }

            internal override bool parse(byte[] plain)
            {
                  try
                  {

                        if(vendor==VENDOR_FSECURE)
                        {
                              if(plain[0]!=0x30)
                              {              // FSecure
                                    Buffer buf=new Buffer(plain);
                                    buf.getInt();
                                    P_array=buf.getMPIntBits();
                                    G_array=buf.getMPIntBits();
                                    Q_array=buf.getMPIntBits();
                                    pub_array=buf.getMPIntBits();
                                    prv_array=buf.getMPIntBits();
                                    return true;
                              }
                              return false;
                        }

                        int index=0;
                        int Length=0;

                        if(plain[index]!=0x30)return false;
                        index++; // SEQUENCE
                        Length=plain[index++]&0xff;
                        if((Length&0x80)!=0)
                        {
                              int foo=Length&0x7f; Length=0;
                              while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
                        }

                        if(plain[index]!=0x02)return false;
                        index++; // INTEGER
                        Length=plain[index++]&0xff;
                        if((Length&0x80)!=0)
                        {
                              int foo=Length&0x7f; Length=0;
                              while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
                        }
                        index+=Length;

                        index++;
                        Length=plain[index++]&0xff;
                        if((Length&0x80)!=0)
                        {
                              int foo=Length&0x7f; Length=0;
                              while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
                        }
                        P_array=new byte[Length];
                        Array.Copy(plain, index, P_array, 0, Length);
                        index+=Length;

                        index++;
                        Length=plain[index++]&0xff;
                        if((Length&0x80)!=0)
                        {
                              int foo=Length&0x7f; Length=0;
                              while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
                        }
                        Q_array=new byte[Length];
                        Array.Copy(plain, index, Q_array, 0, Length);
                        index+=Length;

                        index++;
                        Length=plain[index++]&0xff;
                        if((Length&0x80)!=0)
                        {
                              int foo=Length&0x7f; Length=0;
                              while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
                        }
                        G_array=new byte[Length];
                        Array.Copy(plain, index, G_array, 0, Length);
                        index+=Length;

                        index++;
                        Length=plain[index++]&0xff;
                        if((Length&0x80)!=0)
                        {
                              int foo=Length&0x7f; Length=0;
                              while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
                        }
                        pub_array=new byte[Length];
                        Array.Copy(plain, index, pub_array, 0, Length);
                        index+=Length;

                        index++;
                        Length=plain[index++]&0xff;
                        if((Length&0x80)!=0)
                        {
                              int foo=Length&0x7f; Length=0;
                              while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
                        }
                        prv_array=new byte[Length];
                        Array.Copy(plain, index, prv_array, 0, Length);
                        index+=Length;
                  }
                  catch//(Exception e)
                  {
                        //System.out.println(e);
                        //e.printStackTrace();
                        return false;
                  }
                  return true;
            }

            public override byte[] getPublicKeyBlob()
            {
                  byte[] foo=base.getPublicKeyBlob();
                  if(foo!=null) return foo;

                  if(P_array==null) return null;

                  Buffer buf=new Buffer(sshdss.Length+4+
                        P_array.Length+4+ 
                        Q_array.Length+4+ 
                        G_array.Length+4+ 
                        pub_array.Length+4);
                  buf.putString(sshdss);
                  buf.putString(P_array);
                  buf.putString(Q_array);
                  buf.putString(G_array);
                  buf.putString(pub_array);
                  return buf.buffer;
            }

            private static byte[] sshdss= Util.getBytes( "ssh-dss" );
            internal override byte[] getKeyTypeName(){return sshdss;}
            public override int getKeyType(){return DSA;}

            public override int getKeySize(){return key_size; }
            public override void dispose()
            {
                  base.dispose();
                  P_array=null;
                  Q_array=null;
                  G_array=null;
                  pub_array=null;
                  prv_array=null;
            }
      }

}

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