identityfile.cs

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				foo=Q_array;
				for(i=0;  i<foo.Length; i++){
				System.out.print(Integer.toHexString(foo[i]&0xff)+":");
				}
				System.out.println("");
				System.out.print("G ");
				foo=G_array;
				for(i=0;  i<foo.Length; i++){
				System.out.print(Integer.toHexString(foo[i]&0xff)+":");
				}
				System.out.println("");
			*/

			try
			{      
				Type t=Type.GetType(jsch.getConfig("signature.dss"));
				SignatureDSA dsa=(SignatureDSA)(Activator.CreateInstance(t));
				dsa.init();
				dsa.setPrvKey(prv_array, P_array, Q_array, G_array);

				/*
				byte[] goo=new byte[4];
				goo[0]=(byte)(session.getSessionId().Length>>>24);
				goo[1]=(byte)(session.getSessionId().Length>>>16);
				goo[2]=(byte)(session.getSessionId().Length>>>8);
				goo[3]=(byte)(session.getSessionId().Length);
				dsa.update(goo);
				dsa.update(session.getSessionId());
				*/
				dsa.update(data);
				byte[] sig = dsa.sign();
				Buffer buf=new Buffer("ssh-dss".Length+4+
					sig.Length+4);
				buf.putString( System.Text.Encoding.Default.GetBytes( "ssh-dss" ) );
				buf.putString(sig);
				return buf.buffer;
			}
			catch(Exception e)
			{
				Console.WriteLine("e "+e);
			}
			return null;
		}

		public bool decrypt()
		{
			if(type==RSA) return decrypt_rsa();
			return decrypt_dss();
		}

		bool decrypt_rsa()
		{
//			byte[] p_array;
//			byte[] q_array;
//			byte[] dmp1_array;
//			byte[] dmq1_array;
//			byte[] iqmp_array;

			try
			{
				byte[] plain;
				if(encrypted)
				{
					if(keytype==OPENSSH)
					{
						cipher.init(Cipher.DECRYPT_MODE, key, iv);
						plain=new byte[encoded_data.Length];
						cipher.update(encoded_data, 0, encoded_data.Length, plain, 0);
					}
					else if(keytype==FSECURE)
					{
						for(int i=0; i<iv.Length; i++)iv[i]=0;
						cipher.init(Cipher.DECRYPT_MODE, key, iv);
						plain=new byte[encoded_data.Length];
						cipher.update(encoded_data, 0, encoded_data.Length, plain, 0);
					}
					else
					{
						return false;
					}
				}
				else
				{
					if(n_array!=null) return true;
					plain=encoded_data;
				}

				if(keytype==FSECURE)
				{              // FSecure   
					Buffer buf=new Buffer(plain);
					int foo=buf.getInt();
					if(plain.Length!=foo+4)
					{
						return false;
					}
					e_array=buf.getMPIntBits();
					d_array=buf.getMPIntBits();
					n_array=buf.getMPIntBits();
					byte[] u_array=buf.getMPIntBits();
					p_array=buf.getMPIntBits();
					q_array=buf.getMPIntBits();
					return true;
				}

				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;

				//System.out.println("int: len="+Length);
				//System.out.print(Integer.toHexString(plain[index-1]&0xff)+":");
				//System.out.println("");

				index++;
				Length=plain[index++]&0xff;
				if((Length&0x80)!=0)
				{
					int foo=Length&0x7f; Length=0;
					while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
				}
				n_array=new byte[Length];
				Array.Copy(plain, index, n_array, 0, Length);
				index+=Length;
				/*
				System.out.println("int: N len="+Length);
				for(int i=0; i<n_array.Length; i++){
				System.out.print(Integer.toHexString(n_array[i]&0xff)+":");
				}
				System.out.println("");
				*/
				index++;
				Length=plain[index++]&0xff;
				if((Length&0x80)!=0)
				{
					int foo=Length&0x7f; Length=0;
					while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
				}
				e_array=new byte[Length];
				Array.Copy(plain, index, e_array, 0, Length);
				index+=Length;
				/*
				System.out.println("int: E len="+Length);
				for(int i=0; i<e_array.Length; i++){
				System.out.print(Integer.toHexString(e_array[i]&0xff)+":");
				}
				System.out.println("");
				*/
				index++;
				Length=plain[index++]&0xff;
				if((Length&0x80)!=0)
				{
					int foo=Length&0x7f; Length=0;
					while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
				}
				d_array=new byte[Length];
				Array.Copy(plain, index, d_array, 0, Length);
				index+=Length;
				/*
				System.out.println("int: D len="+Length);
				for(int i=0; i<d_array.Length; i++){
				System.out.print(Integer.toHexString(d_array[i]&0xff)+":");
				}
				System.out.println("");
				*/

				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;
				/*
				System.out.println("int: P len="+Length);
				for(int i=0; i<p_array.Length; i++){
				System.out.print(Integer.toHexString(p_array[i]&0xff)+":");
				}
				System.out.println("");
				*/
				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;
				/*
				System.out.println("int: q len="+Length);
				for(int i=0; i<q_array.Length; i++){
				System.out.print(Integer.toHexString(q_array[i]&0xff)+":");
				}
				System.out.println("");
				*/
				index++;
				Length=plain[index++]&0xff;
				if((Length&0x80)!=0)
				{
					int foo=Length&0x7f; Length=0;
					while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
				}
				dmp1_array=new byte[Length];
				Array.Copy(plain, index, dmp1_array, 0, Length);
				index+=Length;
				/*
				System.out.println("int: dmp1 len="+Length);
				for(int i=0; i<dmp1_array.Length; i++){
				System.out.print(Integer.toHexString(dmp1_array[i]&0xff)+":");
				}
				System.out.println("");
				*/
				index++;
				Length=plain[index++]&0xff;
				if((Length&0x80)!=0)
				{
					int foo=Length&0x7f; Length=0;
					while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
				}
				dmq1_array=new byte[Length];
				Array.Copy(plain, index, dmq1_array, 0, Length);
				index+=Length;
				/*
				System.out.println("int: dmq1 len="+Length);
				for(int i=0; i<dmq1_array.Length; i++){
				System.out.print(Integer.toHexString(dmq1_array[i]&0xff)+":");
				}
				System.out.println("");
				*/
				index++;
				Length=plain[index++]&0xff;
				if((Length&0x80)!=0)
				{
					int foo=Length&0x7f; Length=0;
					while(foo-->0){ Length=(Length<<8)+(plain[index++]&0xff); }
				}
				iqmp_array=new byte[Length];
				Array.Copy(plain, index, iqmp_array, 0, Length);
				index+=Length;
				/*
				System.out.println("int: iqmp len="+Length);
				for(int i=0; i<iqmp_array.Length; i++){
				System.out.print(Integer.toHexString(iqmp_array[i]&0xff)+":");
				}
				System.out.println("");
				*/
			}
			catch
			{
				//System.out.println(e);
				return false;
			}
			return true;
		}

		bool decrypt_dss()
		{
			try
			{
				byte[] plain;
				if(encrypted)
				{
					if(keytype==OPENSSH)
					{
						cipher.init(Cipher.DECRYPT_MODE, key, iv);
						plain=new byte[encoded_data.Length];
						cipher.update(encoded_data, 0, encoded_data.Length, plain, 0);
						/*
						for(int i=0; i<plain.Length; i++){
						System.out.print(Integer.toHexString(plain[i]&0xff)+":");
						}
						System.out.println("");
						*/
					}
					else if(keytype==FSECURE)
					{
						for(int i=0; i<iv.Length; i++)iv[i]=0;
						cipher.init(Cipher.DECRYPT_MODE, key, iv);
						plain=new byte[encoded_data.Length];
						cipher.update(encoded_data, 0, encoded_data.Length, plain, 0);
					}
					else
					{
						return false;
					}
				}
				else
				{
					if(P_array!=null) return true;
					plain=encoded_data;
				}

				if(keytype==FSECURE)
				{              // FSecure   
					Buffer buf=new Buffer(plain);
					int foo=buf.getInt();
					if(plain.Length!=foo+4)
					{
						return false;
					}
					P_array=buf.getMPIntBits();
					G_array=buf.getMPIntBits();
					Q_array=buf.getMPIntBits();
					pub_array=buf.getMPIntBits();
					prv_array=buf.getMPIntBits();
					return true;
				}

				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
			{
				//System.out.println(e);
				//e.printStackTrace();
				return false;
			}
			return true;
		}

		public bool isEncrypted()
		{
			return encrypted;
		}
		public String getName(){return identity;}

		private int writeSEQUENCE(byte[] buf, int index, int len)
		{
			buf[index++]=0x30;
			index=writeLength(buf, index, len);
			return index;
		}
		private int writeINTEGER(byte[] buf, int index, byte[] data)
		{
			buf[index++]=0x02;
			index=writeLength(buf, index, data.Length);
			Array.Copy(data, 0, buf, index, data.Length);
			index+=data.Length;
			return index;
		}

		private int countLength(int i_len)
		{
			uint len = (uint)i_len;
			int i=1;
			if(len<=0x7f) return i;
			while(len>0)
			{
				len>>=8;
				i++;
			}
			return i;
		}

		private int writeLength(byte[] data, int index, int i_len)
		{
			int len = (int)i_len;
			int i=countLength(len)-1;
			if(i==0)
			{
				data[index++]=(byte)len;
				return index;
			}
			data[index++]=(byte)(0x80|i);
			int j=index+i;
			while(i>0)
			{
				data[index+i-1]=(byte)(len&0xff);
				len>>=8;
				i--;
			}
			return j;
		}

		private byte a2b(byte c)
		{
			if('0'<=c&&c<='9') return (byte)(c-'0');
			if('a'<=c&&c<='z') return (byte)(c-'a'+10);
			return (byte)(c-'A'+10);
		}
		private byte b2a(byte c)
		{
			if(0<=c&&c<=9) return (byte)(c+'0');
			return (byte)(c-10+'A');
		}
	}

}