package text.java;


    import java.io.*;
import java.math.*;
import java.security.*;
import java.security.spec.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import javax.crypto.interfaces.*;

    public class Key_DH{
        //三个静态变量的定义从
// C:\j2sdk-1_4_0-doc\docs\guide\security\jce\JCERefGuide.html
// 拷贝而来
// The 1024 bit Diffie-Hellman modulus values used by SKIP
        private static final byte skip1024ModulusBytes[] = {
                (byte)0xF4, (byte)0x88, (byte)0xFD, (byte)0x58,
                (byte)0x4E, (byte)0x49, (byte)0xDB, (byte)0xCD,
                (byte)0x20, (byte)0xB4, (byte)0x9D, (byte)0xE4,
                (byte)0x91, (byte)0x07, (byte)0x36, (byte)0x6B,
                (byte)0x33, (byte)0x6C, (byte)0x38, (byte)0x0D,
                (byte)0x45, (byte)0x1D, (byte)0x0F, (byte)0x7C,
                (byte)0x88, (byte)0xB3, (byte)0x1C, (byte)0x7C,
                (byte)0x5B, (byte)0x2D, (byte)0x8E, (byte)0xF6,
                (byte)0xF3, (byte)0xC9, (byte)0x23, (byte)0xC0,
                (byte)0x43, (byte)0xF0, (byte)0xA5, (byte)0x5B,
                (byte)0x18, (byte)0x8D, (byte)0x8E, (byte)0xBB,
                (byte)0x55, (byte)0x8C, (byte)0xB8, (byte)0x5D,
                (byte)0x38, (byte)0xD3, (byte)0x34, (byte)0xFD,
                (byte)0x7C, (byte)0x17, (byte)0x57, (byte)0x43,
                (byte)0xA3, (byte)0x1D, (byte)0x18, (byte)0x6C,
                (byte)0xDE, (byte)0x33, (byte)0x21, (byte)0x2C,
                (byte)0xB5, (byte)0x2A, (byte)0xFF, (byte)0x3C,
                (byte)0xE1, (byte)0xB1, (byte)0x29, (byte)0x40,
                (byte)0x18, (byte)0x11, (byte)0x8D, (byte)0x7C,
                (byte)0x84, (byte)0xA7, (byte)0x0A, (byte)0x72,
                (byte)0xD6, (byte)0x86, (byte)0xC4, (byte)0x03,
                (byte)0x19, (byte)0xC8, (byte)0x07, (byte)0x29,
                (byte)0x7A, (byte)0xCA, (byte)0x95, (byte)0x0C,
                (byte)0xD9, (byte)0x96, (byte)0x9F, (byte)0xAB,
                (byte)0xD0, (byte)0x0A, (byte)0x50, (byte)0x9B,
                (byte)0x02, (byte)0x46, (byte)0xD3, (byte)0x08,
                (byte)0x3D, (byte)0x66, (byte)0xA4, (byte)0x5D,
                (byte)0x41, (byte)0x9F, (byte)0x9C, (byte)0x7C,
                (byte)0xBD, (byte)0x89, (byte)0x4B, (byte)0x22,
                (byte)0x19, (byte)0x26, (byte)0xBA, (byte)0xAB,
                (byte)0xA2, (byte)0x5E, (byte)0xC3, (byte)0x55,
                (byte)0xE9, (byte)0x2F, (byte)0x78, (byte)0xC7
        };
        // The SKIP 1024 bit modulus
        private static final BigInteger skip1024Modulus
                = new BigInteger(1, skip1024ModulusBytes);
        // The base used with the SKIP 1024 bit modulus
        private static final BigInteger skip1024Base = BigInteger.valueOf(2);
        public static void main(String args[ ]) throws Exception{
            DHParameterSpec DHP=
                    new DHParameterSpec(skip1024Modulus,skip1024Base);

            KeyPairGenerator kpg= KeyPairGenerator.getInstance("DH");
            kpg.initialize(DHP);
            KeyPair kp=kpg.genKeyPair();

            PublicKey pbk=kp.getPublic();
            PrivateKey prk=kp.getPrivate();
            // 保存公钥
            FileOutputStream  f1=new FileOutputStream(args[0]);
            ObjectOutputStream b1=new  ObjectOutputStream(f1);
            b1.writeObject(pbk);
            // 保存私钥
            FileOutputStream  f2=new FileOutputStream(args[1]);
            ObjectOutputStream b2=new  ObjectOutputStream(f2);
            b2.writeObject(prk);
        }
    }