标签：Java String RSA KEY offSet new 加密算法 out
这里提供一个RSA加密算法的工具类，其中包含生成密钥、加密、解密、加签、验签等RSA常用的方法，可以直接使用
引入 Maven 依赖，(如果不引入则需要修改 base64加密、解密方法为 java.ultils.base64)
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>com.auth0</groupId>
<artifactId>java-jwt</artifactId>
<version>3.19.2</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
RSA工具类
package cn.lzscxb.common.utils;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
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;
/**
* @Description RSA非对称加密算法工具类
* @Author LzsCxb
* @Date 2022/07/04 20:26
*/
public class RSAUtils {
/**
* RSA最大加密明文大小 2048/8-11
*/
private static final int MAX_ENCRYPT_BLOCK = 245;
/**
* RSA最大解密密文大小 2048/8
*/
private static final int MAX_DECRYPT_BLOCK = 256;
/**
* 定义加密方式
*/
public static final String KEY_RSA = "RSA";
/**
* 定义公钥
*/
public static final String KEY_RSA_PUBLICKEY = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAhbMJG9i6O0T1hQ8oCoThMAg/0mlcerjYn+wMdZudoDCeEbxKYebs+WoNvBmV26A/co9yJ2+aUIf60kkJ6YwDh9pXSk2vgm7x0TAZ9HzRhpk6td4JO4HM9QpPaQG2Z3Tw8DnhNk7yGADp+weLqgULDDlUI7lm1s1G9OSY+ZK2TwjKPSC4j1CnjD6kvSW1qVGB0GhkreX877Rop+KbOmVE+JtQQgc+DcOgyMjGtSvDGrwBsI569wrywlOeFMLqVDlVLi3ugWDSEn3EHz63Nj442VSfR6ukxtifIwmogUI4VplXQoO4Am6kKH50tkggqVBNFGh0s5qavpig0XYkn42+6QIDAQAB";
/**
* 定义私钥
*/
public static final String KEY_RSA_PRIVATEKEY = "MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCFswkb2Lo7RPWFDygKhOEwCD/SaVx6uNif7Ax1m52gMJ4RvEph5uz5ag28GZXboD9yj3Inb5pQh/rSSQnpjAOH2ldKTa+CbvHRMBn0fNGGmTq13gk7gcz1Ck9pAbZndPDwOeE2TvIYAOn7B4uqBQsMOVQjuWbWzUb05Jj5krZPCMo9ILiPUKeMPqS9JbWpUYHQaGSt5fzvtGin4ps6ZUT4m1BCBz4Nw6DIyMa1K8MavAGwjnr3CvLCU54UwupUOVUuLe6BYNISfcQfPrc2PjjZVJ9Hq6TG2J8jCaiBQjhWmVdCg7gCbqQofnS2SCCpUE0UaHSzmpq+mKDRdiSfjb7pAgMBAAECggEAR3vSAvF9oPLd0qan4ffp7qR6eyWaLINoTxkGEFuDi4JzAUiK/I1bZn8tmMSVOzgStE292xfwid4qXQRwKE6UFK7IvRGMJVDsOcxeFDooTK7glRyCEy7zRpCcpKglvmrn54kKwN600eCrOWxvYBgSMBb2xaL7OR3IMmeG4uluUBK8u8phRfXbt1CaQvzfqZqZbspE/XX23Lgnxq/7PV2ME1ukOHAzQm8XdSQosLTX2WhbGBCG8xG1Ia9qZ5R63Y3Gk8gnXxVEpzcbtF7sxU/hDwdpfb7wiIQTyoBcL/XIr9I42p4TvizAtr4spzzkIMprKiEAP1IozBCD3YWvPMUJgQKBgQDGgSoosujtJ2OicvtJrO67YW6ecMc9L2VBY/qAxrivC+Ups/rS2PPchNy9abv8JGnCpa1MdOUudpaSv9g47BES5NwZ38bGHj+U7Wg9VIRQ/G8dxWelQrVgALLJ9mjDmJrenUmfwBaYqej3fvYZMA/hWT0CUhBWKVn1X0nPzXlYRwKBgQCsbKgHrQK39bccVMBDBnsRLXzJOLcIFu+AHShhqQfttMeDOQiXuVpy4CAv84y0Y3/rV7Yr6RGZ1pOTOr2NvTGUka/ZfOvYi8UPULzAOLh02KBb1LtcRrvwPYuoLxKN81XYZ85yS7EggpEFtbsm0YSZozv4Vx5uccHxevzHXBn3TwKBgQCj83DPtp09qufW96LnAicXquyDfmCA/5FhBeOT0w4cvfVjkVycI0afHzl2VEtIgQa9Frvgxze3PYk14bADq66abV4BHNt/LOKU7dTHuvOiNCzOaQom68cEaO9CcfureXKIZV62zB+drdBWAo3e1dx34o3KSd9mWrcLO82qDWqo5wKBgGxZAuV/5Dtw3hWhdAcqJV9P9CAF0Y31y533tI5Zxy+p780Xo7yjrqCNEezP4FTiSVm7ji/djz/aRHW57a8JegRf396Mzy8N9VCAbXtkqRRTo8DQ1sNPd32pTv7qRYCJriIEaQgNZEqHgVXTMr1b3zUkC+Ur6WWBeluh6wHjcDWlAoGAfduQDd31wN1r8MaTv0Uj1k4YXWPQdfKlmATsD0iT1oMg2bfPVwPhs+UI5hwhu2KD/zjzS7qGyfXiTXLh11pJrlFV9D5OVsxwOKwCGe1mUuwmBtWTTLxw1Irlz91Tu3sgioSZ9MeuUHI1psAttcnxGmOq6taEXCFkr20q+9SH3fk=";
/**
* 定义签名算法
*/
private final static String KEY_RSA_SIGNATURE = "sha256withRSA";
/**
* 生成公私密钥对
*/
public static Map<String, Object> init() {
Map<String, Object> map = null;
try {
KeyPairGenerator generator = KeyPairGenerator.getInstance(KEY_RSA);
//设置密钥对的bit数，越大越安全，但速度减慢，一般使用512或1024、2048
generator.initialize(2048);
KeyPair keyPair = generator.generateKeyPair();
// 获取公钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
// 获取私钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
// 将密钥对封装为Map
map = new HashMap<String, Object>(2);
map.put(KEY_RSA_PUBLICKEY, publicKey);
map.put(KEY_RSA_PRIVATEKEY, privateKey);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return map;
}
/**
* 获取 RSAPublicKey
*/
public static RSAPublicKey getPublicKey() throws Exception {
byte[] decoded = Base64.decodeBase64(KEY_RSA_PUBLICKEY);
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PublicKey publicKey = factory.generatePublic(new X509EncodedKeySpec(decoded));
return (RSAPublicKey) publicKey;
}
/**
* 获取 RSAPrivateKey
*/
public static RSAPrivateKey getPrivateKey() throws Exception {
byte[] decoded = Base64.decodeBase64(KEY_RSA_PRIVATEKEY);
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PrivateKey privateKey = factory.generatePrivate(new PKCS8EncodedKeySpec(decoded));
return (RSAPrivateKey) privateKey;
}
/**
* 公钥加密 如果大于245则分段加密
*/
public static String encryptByPublic(String encryptingStr, String publicKeyStr) {
try {
// 将公钥由字符串转为UTF-8格式的字节数组
byte[] publicKeyBytes = Base64.decodeBase64(publicKeyStr);
// 获得公钥
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes);
// 取得待加密数据
byte[] data = encryptingStr.getBytes(StandardCharsets.UTF_8);
KeyFactory factory;
factory = KeyFactory.getInstance(KEY_RSA);
PublicKey publicKey = factory.generatePublic(keySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
// 返回加密后由Base64编码的加密信息
return new String(Base64.encodeBase64(encryptedData));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 私钥解密 如果大于256则分段解密
*/
public static String decryptByPrivate(String encryptedStr, String privateKeyStr) {
try {
// 对私钥解密
byte[] privateKeyBytes = Base64.decodeBase64(privateKeyStr);
// 获得私钥
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
// 获得待解密数据
byte[] data = Base64.decodeBase64(encryptedStr);
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PrivateKey privateKey = factory.generatePrivate(keySpec);
// 对数据解密
Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
// 返回UTF-8编码的解密信息
return new String(decryptedData, StandardCharsets.UTF_8);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 私钥加密 如果大于245则分段加密
*/
public static String encryptByPrivate(String encryptingStr, String privateKeyStr) {
try {
byte[] privateKeyBytes = Base64.decodeBase64(privateKeyStr);
// 获得私钥
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
// 取得待加密数据
byte[] data = encryptingStr.getBytes(StandardCharsets.UTF_8);
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PrivateKey privateKey = factory.generatePrivate(keySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
// 返回加密后由Base64编码的加密信息
return new String(Base64.encodeBase64(encryptedData));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 公钥解密 如果大于256则分段解密
*/
public static String decryptByPublic(String encryptedStr, String publicKeyStr) {
try {
// 对公钥解密
byte[] publicKeyBytes = Base64.decodeBase64(publicKeyStr);
// 取得公钥
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes);
// 取得待加密数据
byte[] data = Base64.decodeBase64(encryptedStr);
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PublicKey publicKey = factory.generatePublic(keySpec);
// 对数据解密
Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicKey);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
// 返回UTF-8编码的解密信息
return new String(decryptedData, StandardCharsets.UTF_8);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 用私钥对加密数据进行签名
*/
public static String sign(String encryptedStr, String privateKey) {
String str = "";
try {
//将私钥加密数据字符串转换为字节数组
byte[] data = encryptedStr.getBytes();
// 解密由base64编码的私钥
byte[] bytes = Base64.decodeBase64(privateKey);
// 构造PKCS8EncodedKeySpec对象
PKCS8EncodedKeySpec pkcs = new PKCS8EncodedKeySpec(bytes);
// 指定的加密算法
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
// 取私钥对象
PrivateKey key = factory.generatePrivate(pkcs);
// 用私钥对信息生成数字签名
Signature signature = Signature.getInstance(KEY_RSA_SIGNATURE);
signature.initSign(key);
signature.update(data);
str = new String(Base64.encodeBase64(signature.sign()));
} catch (Exception e) {
e.printStackTrace();
}
return str;
}
/**
* 校验数字签名
*
* @return 校验成功返回true，失败返回false
*/
public static boolean verify(String encryptedStr, String publicKey, String sign) {
boolean flag = false;
try {
//将私钥加密数据字符串转换为字节数组
byte[] data = encryptedStr.getBytes();
// 解密由base64编码的公钥
byte[] bytes = Base64.decodeBase64(publicKey);
// 构造X509EncodedKeySpec对象
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(bytes);
// 指定的加密算法
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
// 取公钥对象
PublicKey key = factory.generatePublic(keySpec);
// 用公钥验证数字签名
Signature signature = Signature.getInstance(KEY_RSA_SIGNATURE);
signature.initVerify(key);
signature.update(data);
flag = signature.verify(Base64.decodeBase64(sign));
} catch (Exception e) {
e.printStackTrace();
}
return flag;
}
/**
* 功能描述:格式化公私钥 C++格式
* 公钥字符串开头要加上“-----BEGIN PUBLIC KEY-----\n”，结尾加上“\n-----END PUBLIC KEY-----\n”
* 私钥字符串开头要加上“-----BEGIN RSA PRIVATE KEY-----\n”，结尾加上“\n-----END RSA PRIVATE KEY-----\n”
*
* @param str 要格式的字符串, flag
* @param flag true为公 false为私
* @return java.lang.String
* @author xiaobu
* @date 2020/3/18 16:40
* @version 1.0
*/
public static String formatStr(String str, boolean flag) {
StringBuilder sb = new StringBuilder(str);
for (int i = 0, len = sb.length(); i < len; i++) {
if (i % 64 == 0) {
sb.insert(i, "\n");
}
}
if (flag) {
sb = new StringBuilder("-----BEGIN PUBLIC KEY-----").append(sb).append("\n-----END PUBLIC KEY-----\n");
} else {
sb = new StringBuilder("-----BEGIN RSA PRIVATE KEY-----").append(sb).append("\n-----END RSA PRIVATE KEY-----\n");
}
return sb.toString();
}
/**
* 测试方法
*/
public static void main(String[] args) {
// 生成 RSA 密钥
Map<String, Object> map = new HashMap<String, Object>(2);
map = RSAUtils.init();
System.out.println(map);
// 使用密钥进行认证
String publicKey = RSAUtils.KEY_RSA_PUBLICKEY;
String privateKey = RSAUtils.KEY_RSA_PRIVATEKEY;
System.out.println("publicKey = " + publicKey);
System.out.println("privateKey = " + privateKey);
System.out.println("formatStr(publicKey,false) = " + formatStr(publicKey, true));
System.out.println("formatStr(privateKey,false) = " + formatStr(privateKey, false));
//由前四行代码获得公、私密钥
// publicKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAjVgHojy7oZ1Gl/iT9CXgvzlqPyV5wxvSRW7f6qDQh1FreYVTIbyVOees9LDbyFyocLCx6Cz3E4csHJvjwIem6SuZpIpmeJGS5bo04JVK2JwdqbFoIXd1Q5bGsA17nUNlnSR4h3ODM8OCKsC0Qpt1KSvN0WB2JUGBbUFwiPxrwEMLeYntz4cABBA/KYt5Ac9HBk5TDRDpFVlOM43t0B2219GxQOxm1x8fFjwzKV06nwYbmIuqoKqQVlym3FYrYiOdd0/iXXxp4Whi0Hdo7XyfaQhoCCd3FNnFP8Ng0HDAW99HxEaP9eIuC4wCV16o8jsUzm7V/yhTF1NlIPlTQW35hQIDAQAB";
String str = "1 InnoDB 支持表锁和行锁，使用索引作为检索条件修改数据时采用行锁，否则采用表锁。\n" + "2 InnoDB 自动给修改操作加锁，给查询操作不自动加锁" + "3 行锁可能因为未使用索引而升级为表锁，所以除了检查索引是否创建的同时，也需要通过explain执行计划查询索引是否被实际使用。, RSA!";
// 公钥加密，私钥解密
String enStr1 = RSAUtils.encryptByPublic(str, publicKey);
System.out.println("公钥加密后：" + enStr1);
String deStr1 = RSAUtils.decryptByPrivate(enStr1, privateKey);
System.out.println("私钥解密后：" + deStr1);
// 私钥加密，公钥解密
String enStr2 = RSAUtils.encryptByPrivate(str, privateKey);
System.out.println("私钥加密后：" + enStr2);
String deStr2 = RSAUtils.decryptByPublic(enStr2, publicKey);
System.out.println("公钥解密后：" + deStr2);
// 产生签名
String sign = sign(enStr2, privateKey);
System.out.println("签名:" + sign);
// 验证签名
boolean status = verify(enStr2, publicKey, sign);
System.out.println("状态:" + status);
}
}
JWT 工具类
package cn.lzscxb.common.utils;
import cn.lzscxb.entity.exception.ConditionException;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.SignatureVerificationException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import com.auth0.jwt.interfaces.Claim;
import com.auth0.jwt.interfaces.DecodedJWT;
import lombok.extern.slf4j.Slf4j;
import java.util.Calendar;
import java.util.Date;
import java.util.Map;
@Slf4j
public class TokenUtils {
private static final String ISSUER = "lzscxb.cn";
private static final Integer EXPIRE =30 ;
/**
* 生成token
*
* @param userId
* @return
* @throws Exception
*/
public static String generateToken(Long userId, String phone, String avatar, String nickname) {
Algorithm algorithm = null;
try {
algorithm = Algorithm.RSA256(RSAUtils.getPublicKey(), RSAUtils.getPrivateKey());
} catch (Exception e) {
throw new RuntimeException(e);
}
Calendar calendar = Calendar.getInstance(); // 日历类用于生成过期时间
calendar.setTime(new Date());
calendar.add(Calendar.SECOND, EXPIRE);
return JWT.create().withKeyId(String.valueOf(userId)).withIssuer(ISSUER).withExpiresAt(calendar.getTime()).withClaim("user_id", userId).withClaim("phone", phone).withClaim("avatar", avatar).withClaim("nickname", nickname).sign(algorithm);
}
public static Map<String, Claim> VerifyToken(String token) {
try {
Algorithm algorithm = Algorithm.RSA256(RSAUtils.getPublicKey(), RSAUtils.getPrivateKey());
JWTVerifier verifier = JWT.require(algorithm).build();
DecodedJWT jwt = verifier.verify(token);
Map<String, Claim> claims = jwt.getClaims();
return claims;
} catch (TokenExpiredException e) {
throw new ConditionException(401, "token 令牌已过期");
} catch (SignatureVerificationException e) {
e.printStackTrace();
log.info(token);
throw new ConditionException(401, "token 令牌无效");
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
标签：Java,String,RSA,KEY,offSet,new,加密算法,out 来源： https://www.cnblogs.com/LzsCxb/p/16444989.html
本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享； 2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关； 3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关； 4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除； 5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。