SHA256、RSA1024加密解密，加签验签

最新推荐文章于 2025-09-29 10:46:49 发布

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最新推荐文章于 2025-09-29 10:46:49 发布 · 3.5k 阅读

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package com.common.util;

import javax.crypto.Cipher;

import cat.util.charset.Base64;

import java.io.ByteArrayOutputStream;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

/**
* @author : lml
* @Description: RSA工具类，支持长度为2048的秘钥
* @date : 2020/3/23
* @time : 16:29
*/
public class RSAUtils2048 {

/**
* 加密算法RSA
*/
private static final String KEY_ALGORITHM = "RSA";

/**
* 签名算法
*/
// public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
private static final String SIGNATURE_ALGORITHM = "SHA256withRSA";

/**
* 获取公钥的key
*/
private static final String PUBLIC_KEY = "RSAPublicKey";

/**
* 获取私钥的key
*/
private static final String PRIVATE_KEY = "RSAPrivateKey";

/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 245;

/**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 256;

public static void main(String[] args) {

/*RSA 1024 */
// String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCIarYvrIMZGHKa8f2E6ubg0//28R1zJ4ArD+XELXYvDrM8UBR42PqJCpjPN3hC91YAnnk2Y9U+X5o/rGxH5ZTZzYy+rkAmZFJa1fK2mWDxPYJoxH+DGHQc+h8t83BMB4pKqVPhcJVF6Ie+qpD5RFUU/e5iEz8ZZFDroVE3ubKaKwIDAQAB";
// String privateKey = "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";

/*RSA 2048*/

String publicKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv3+Le3a9DL5hLDnOZllw9va/vQaPab75O++7vK/WZqv7H+sMniK/eHgHReykORy81slAgDVIbg54M8hr5KbYquuJfRcvl0xgytu6Dc3nUpCnMcb1OV5UJtampBc1CdLioQcoZx7GCzhi7rKpga2VQXNtJ7ez83xNvK10+EIdwqWvLpkLHKNURbD7aaz4axNu/LJImx649CRMEDRgzlbsmXqdjpqK11qjmkqUE8WYytr9RJEBE0GRdtTCYgrqUB6/n5MQv8jwCntdSR9z55l9Z8ZaA16UTq1Vyq4EKvcHSjr8WXEDkIcsZ5ekq+qdtSq9eTQOtLBr7s0AZJHVUhIJswIDAQAB";
String privateKey = "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