用Java实现 rsa加密算法 用中文注释

以下是Java实现RSA加密算法的示例代码，注释中有中文解释：

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

public class RSA {
    private final static BigInteger one = new BigInteger("1");
    private final static SecureRandom random = new SecureRandom();

    private BigInteger privateKey;
    private BigInteger publicKey;
    private BigInteger modulus;

    // 生成公钥和私钥
    public RSA(int bitLength) {
        BigInteger p = BigInteger.probablePrime(bitLength / 2, random);
        BigInteger q = BigInteger.probablePrime(bitLength / 2, random);
        BigInteger phi = (p.subtract(one)).multiply(q.subtract(one));

        modulus = p.multiply(q);
        publicKey = new BigInteger("65537"); // 一般采用65537作为公钥
        privateKey = publicKey.modInverse(phi);
    }

    // 加密
    public byte[] encrypt(byte[] message) {
        return (new BigInteger(message)).modPow(publicKey, modulus).toByteArray();
    }

    // 解密
    public byte[] decrypt(byte[] message) {
        return (new BigInteger(message)).modPow(privateKey, modulus).toByteArray();
    }
}

使用示例：

public class Main {
    public static void main(String[] args) {
        RSA rsa = new RSA(1024);

        String message = "Hello RSA!";
        System.out.println("原文：" + message);

        byte[] encrypted = rsa.encrypt(message.getBytes());
        System.out.println("加密后：" + new String(encrypted));

        byte[] decrypted = rsa.decrypt(encrypted);
        System.out.println("解密后：" + new String(decrypted));
    }
}