eclipse实现可认证的DH密钥交换协议

import java.math.BigInteger;
import java.util.Random;

public class AuthDHKeyAgree {
 private static final i<strong>本文来源gaodai#ma#com搞@代~码^网+</strong>nt securityParam = 1023;
 public static BigInteger p;
 public static BigInteger q;
 public static BigInteger g;
 
 //生成安全素数p,p=2q+1,q为一个1023 bits的大素数
 public static void safePGen() {
 BigInteger one = new BigInteger("1",10);
 BigInteger two = new BigInteger("2",10);
 do {
 p = new BigInteger("0",10);
 q = new BigInteger(securityParam, 100, new Random());
 p = p.add(q.multiply(two).add(one));
 }while( p.isProbablePrime(100) == false );
 }
 
 //选取随机生成元g,通过随机选择[2,p-2]之间的数g,然后判断g^q mod p是否等于1,如果不等于1,则g为生成元
 public static void generatorGGen() {
 BigInteger one = new BigInteger("1",10);
 BigInteger two = new BigInteger("2",10);
 BigInteger result;
 do {
 g = new BigInteger(securityParam, new Random());
 g = g.mod(p.subtract(one));
 result = g.modPow(q, p);
 }while( g.compareTo(two) < 0 || result.compareTo(one) == 0 );
 }
 
 public static void main(String[] args) {
 System.out.println("系统初始化,生成安全素数p,选取随机生成元g...");
 safePGen();
 System.out.println("p: "+p.toString(16));
 System.out.println("q: "+q.toString(16));
 generatorGGen();
 System.out.println("g: "+g.toString(16));
 
 //Alice选择随机秘密值 0<=r1<=p-1
 BigInteger r1 = new BigInteger(securityParam, new Random());
 BigInteger A;
 r1 = r1.mod(p);
 //Alice计算g^r1 mod p
 A = g.modPow(r1, p);
 //Bob选择随机秘密值0<=r2<=p-1
 BigInteger r2 = new BigInteger(securityParam, new Random());
 BigInteger B;
 //Bob计算g^r2 mod p
 B = g.modPow(r2, p);
 //Bob初始化一个RSA签名算法对象
 RSASignatureAlgorithm BobRSA = new RSASignatureAlgorithm();
 BobRSA.initKeys();
 byte[] BobM = (A.toString()+B.toString()+"Alice"+"Bob").getBytes();
 //Bob生成签名
 BigInteger BobSig = BobRSA.signature(BobM);
 //Alice验证签名
 BobM = (A.toString()+B.toString()+"Alice"+"Bob").getBytes();
 boolean result = BobRSA.verify(BobM, BobSig);
 if( result == true ) System.out.println("Alice验证签名通过。");
 else System.out.println("Alice验证签名不通过。");
 //Alice计算会话密钥
 BigInteger sessionKey = (A.multiply(B)).mod(p);
 System.out.println("Alice计算得到的会话密钥为:"+sessionKey.toString(16));
 //Alice初始化一个RSA签名算法对象
 RSASignatureAlgorithm AliceRSA = new RSASignatureAlgorithm();
 AliceRSA.initKeys();
 byte[] AliceM = (A.toString()+B.toString()+"Alice"+"Bob").getBytes();
 //Alice生成签名
 BigInteger AliceSig = AliceRSA.signature(AliceM);
 //Bob验证签名
 AliceM = (A.toString()+B.toString()+"Alice"+"Bob").getBytes();
 result = AliceRSA.verify(AliceM, AliceSig);
 if ( result == true ) System.out.println("Bob验证签名通过。");
 else System.out.println("Bob验证签名不通过");
 //Bob计算会话密钥
 sessionKey = (B.multiply(A)).mod(p);
 System.out.println("Bob计算得到的会话密钥为:"+sessionKey.toString(16));
 }

}