上边那个基于EIGamal签名的盲签名算法的Java程序主函数怎么写

以下是一个基于EIGamal签名的盲签名算法的Java程序主函数示例：

import java.math.BigInteger;
import java.security.SecureRandom;

public class Main {
    public static void main(String[] args) {
        // 生成大素数p和原根g
        BigInteger[] pg = generatePG();
        BigInteger p = pg[0];
        BigInteger g = pg[1];
        System.out.println("p: " + p);
        System.out.println("g: " + g);

        // 随机生成私钥x
        BigInteger x = generatePrivateKey(p);
        System.out.println("x: " + x);

        // 计算公钥y
        BigInteger y = g.modPow(x, p);
        System.out.println("y: " + y);

        // 生成消息m
        BigInteger m = new BigInteger("123456789");

        // 生成盲因子r
        BigInteger r = generateBlindingFactor(p);

        // 计算盲化消息h
        BigInteger h = m.multiply(g.modPow(r, p)).mod(p);
        System.out.println("h: " + h);

        // 签名盲化消息h
        BigInteger[] signature = sign(h, p, g, x);
        BigInteger s1 = signature[0];
        BigInteger s2 = signature[1];
        System.out.println("s1: " + s1);
        System.out.println("s2: " + s2);

        // 计算解盲因子u
        BigInteger u = r.modInverse(p);
        System.out.println("u: " + u);

        // 计算解盲后的签名s
        BigInteger s = s1.multiply(u).mod(p);
        System.out.println("s: " + s);

        // 验证签名
        boolean verified = verify(s, m, y, g, p);
        System.out.println("verified: " + verified);
    }

    // 生成大素数p和原根g
    public static BigInteger[] generatePG() {
        SecureRandom random = new SecureRandom();
        BigInteger p, g;
        do {
            p = BigInteger.probablePrime(512, random);
            g = new BigInteger("2").modPow(p.subtract(BigInteger.ONE).divide(new BigInteger("2")), p);
        } while (g.equals(BigInteger.ONE));
        return new BigInteger[]{p, g};
    }

    // 随机生成私钥x
    public static BigInteger generatePrivateKey(BigInteger p) {
        SecureRandom random = new SecureRandom();
        BigInteger x;
        do {
            x = new BigInteger(p.bitLength(), random);
        } while (x.compareTo(BigInteger.ZERO) <= 0 || x.compareTo(p.subtract(BigInteger.ONE)) >= 0);
        return x;
    }

    // 生成盲因子r
    public static BigInteger generateBlindingFactor(BigInteger p) {
        SecureRandom random = new SecureRandom();
        BigInteger r;
        do {
            r = new BigInteger(p.bitLength(), random);
        } while (r.compareTo(BigInteger.ZERO) <= 0 || r.compareTo(p.subtract(BigInteger.ONE)) >= 0);
        return r;
    }

    // 签名盲化消息h
    public static BigInteger[] sign(BigInteger h, BigInteger p, BigInteger g, BigInteger x) {
        SecureRandom random = new SecureRandom();
        BigInteger k;
        do {
            k = new BigInteger(p.bitLength(), random);
        } while (k.compareTo(BigInteger.ZERO) <= 0 || k.compareTo(p.subtract(BigInteger.ONE)) >= 0);

        BigInteger s1 = g.modPow(k, p);
        BigInteger s2 = h.subtract(x.multiply(s1)).multiply(k.modInverse(p.subtract(BigInteger.ONE))).mod(p.subtract(BigInteger.ONE));

        return new BigInteger[]{s1, s2};
    }

    // 验证签名
    public static boolean verify(BigInteger s, BigInteger m, BigInteger y, BigInteger g, BigInteger p) {
        BigInteger v1 = g.modPow(m, p);
        BigInteger v2 = y.modPow(s, p);
        BigInteger v3 = v1.multiply(v2).mod(p);
        BigInteger v4 = g.modPow(s, p);
        return v3.equals(v4);
    }
}

该示例中，首先生成大素数p和原根g，然后随机生成私钥x，计算公钥y，生成消息m和盲因子r，计算盲化消息h，签名盲化消息h，计算解盲因子u和解盲后的签名s，最后验证签名。

请注意，该示例仅供参考，实际使用中还需要进行更严格的安全性检查和错误处理。