使用DH生成非对称密钥，再生成对称密钥

package com.digican.books.a0102.b0101;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;

import javax.crypto.KeyAgreement;
import javax.crypto.spec.DHParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class TestDHCrypto {

	// 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 {
    	//getA291();
    	//getA292a();
    	getA292b();
	}
    
    /**
	 * 创建DH公钥和私钥
	 */
    public static void getA291() 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();
        FileOutputStream  f1=new FileOutputStream("d:\\zb\\bdhpublickey.txt"); 
        ObjectOutputStream b1=new  ObjectOutputStream(f1); 
        b1.writeObject(pbk);
        b1.flush();

        FileOutputStream  f2=new FileOutputStream("d:\\zb\\bdhprivatekey.txt"); 
        ObjectOutputStream b2=new  ObjectOutputStream(f2); 
        b2.writeObject(prk); 
        b2.flush();
    }
    
    /**
	 * 创建DH共享密钥
	 * 读取自己的私钥和对方的公钥来产生共享密钥
	 * 生成A的共享密钥
	 */
    public static void getA292a() throws Exception {
    	//对方的公钥
    	FileInputStream f1=new FileInputStream("d:\\zb\\bdhpublickey.txt");
    	ObjectInputStream b1=new ObjectInputStream(f1);
    	PublicKey  pbk=(PublicKey)b1.readObject();
    	//自己的私钥
    	FileInputStream f2=new FileInputStream("d:\\za\\adhprivatekey.txt");
    	ObjectInputStream b2=new ObjectInputStream(f2);
    	PrivateKey  prk=(PrivateKey)b2.readObject();
    	KeyAgreement ka=KeyAgreement.getInstance("DH");
    	ka.init(prk);
    	ka.doPhase(pbk, true);
    	byte[] sb=ka.generateSecret();
    	for(int i=0;i<sb.length;i++){
    		System.out.print(sb[i]+" ");
    	}
    }
    
    /**
	 * 创建DH共享密钥
	 * 读取自己的私钥和对方的公钥来产生共享密钥
	 * 生成B的共享密钥
	 */
    public static void getA292b() throws Exception {
    	//对方的公钥
    	FileInputStream f1=new FileInputStream("d:\\za\\adhpublickey.txt");
    	ObjectInputStream b1=new ObjectInputStream(f1);
    	PublicKey  pbk=(PublicKey)b1.readObject();
    	//自己的私钥
    	FileInputStream f2=new FileInputStream("d:\\zb\\bdhprivatekey.txt");
    	ObjectInputStream b2=new ObjectInputStream(f2);
    	PrivateKey  prk=(PrivateKey)b2.readObject();
    	KeyAgreement ka=KeyAgreement.getInstance("DH");
    	ka.init(prk);
    	ka.doPhase(pbk, true);
    	byte[] sb=ka.generateSecret();
    	for(int i=0;i<sb.length;i++){
    		System.out.print(sb[i]+" ");
    	}
    	//SecretKeySpec k = new SecretKeySpec(sb,"DESede");//这个创建的密钥也完全相同
    }
}