RSA之前端加密后端解密
RSA加密解密方式有:
(1)公钥加密,私钥解密;
(2)私钥加密,公钥解密;
此文章中以下我使用的是前端公钥加密,后端私钥解密;
秘钥对生成
http://web.chacuo.net/netrsakeypair
生成对应的公钥和私钥
前端公钥加密
前端加密js文件:
链接: https://pan.baidu.com/s/1NIMayTcmjbMOf7BqPhPQoA 提取码: t7an
下载js文件并引入
<script th:src="@{/js/jsencrypt.min.js}"></script>
<script type="text/javascript">
function rsaPassword() {
var encryptor = new JSEncrypt();
encryptor.setPublicKey('公钥字符串'); // 设置公钥
var rsaPassword=encryptor.encrypt('要加密的字符串');
}
</script>
后端私钥解密
示例文章来源:https://www.toymoban.com/news/detail-834250.html
String encryptPassword=RsaUtil.encryptByPublicKey("要加密的字符串","公钥字符串");
System.out.println("加密:"+encryptPassword);
String decryptPassword=RsaUtil.decryptByPrivateKey(encryptPassword,"私钥字符串");
System.out.println("解密:"+decryptPassword);
后端加解密工具类文章来源地址https://www.toymoban.com/news/detail-834250.html
import javax.crypto.Cipher;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;
/**
* @author 初颜sir
*/
public class RsaUtil {
//签名算法名称
private static final String RSA_KEY_ALGORITHM = "RSA";
//RSA密钥长度,默认密钥长度是1024,密钥长度必须是64的倍数,在512到65536位之间,不管是RSA还是RSA2长度推荐使用2048
private static final int KEY_SIZE = 2048;
/**
* 公钥加密(用于数据加密)
*
* @param data 加密前的字符串
* @param publicKeyStr base64编码后的公钥
* @return base64编码后的字符串
* @throws Exception
*/
public static String encryptByPublicKey(String data, String publicKeyStr) throws Exception {
//Java原生base64解码
byte[] pubKey = Base64.getDecoder().decode(publicKeyStr);
//创建X509编码密钥规范
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(pubKey);
//返回转换指定算法的KeyFactory对象
KeyFactory keyFactory = KeyFactory.getInstance(RSA_KEY_ALGORITHM);
//根据X509编码密钥规范产生公钥对象
PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);
//根据转换的名称获取密码对象Cipher(转换的名称:算法/工作模式/填充模式)
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
//用公钥初始化此Cipher对象(加密模式)
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
//对数据加密
byte[] encrypt = cipher.doFinal(data.getBytes());
//返回base64编码后的字符串
return Base64.getEncoder().encodeToString(encrypt);
}
/**
* 私钥解密(用于数据解密)
*
* @param data 解密前的字符串
* @param privateKeyStr 私钥
* @return 解密后的字符串
* @throws Exception
*/
public static String decryptByPrivateKey(String data, String privateKeyStr) throws Exception {
//Java原生base64解码
byte[] priKey = Base64.getDecoder().decode(privateKeyStr);
//创建PKCS8编码密钥规范
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(priKey);
//返回转换指定算法的KeyFactory对象
KeyFactory keyFactory = KeyFactory.getInstance(RSA_KEY_ALGORITHM);
//根据PKCS8编码密钥规范产生私钥对象
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
//根据转换的名称获取密码对象Cipher(转换的名称:算法/工作模式/填充模式)
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
//用私钥初始化此Cipher对象(解密模式)
cipher.init(Cipher.DECRYPT_MODE, privateKey);
//对数据解密
byte[] decrypt = cipher.doFinal(Base64.getDecoder().decode(data));
//返回字符串
return new String(decrypt);
}
/**
* 私钥加密(用于数据签名)
*
* @param data 加密前的字符串
* @param privateKeyStr base64编码后的私钥
* @return base64编码后后的字符串
* @throws Exception
*/
public static String encryptByPrivateKey(String data, String privateKeyStr) throws Exception {
//Java原生base64解码
byte[] priKey = Base64.getDecoder().decode(privateKeyStr);
//创建PKCS8编码密钥规范
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(priKey);
//返回转换指定算法的KeyFactory对象
KeyFactory keyFactory = KeyFactory.getInstance(RSA_KEY_ALGORITHM);
//根据PKCS8编码密钥规范产生私钥对象
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
//根据转换的名称获取密码对象Cipher(转换的名称:算法/工作模式/填充模式)
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
//用私钥初始化此Cipher对象(加密模式)
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
//对数据加密
byte[] encrypt = cipher.doFinal(data.getBytes());
//返回base64编码后的字符串
return Base64.getEncoder().encodeToString(encrypt);
}
/**
* 公钥解密(用于数据验签)
*
* @param data 解密前的字符串
* @param publicKeyStr base64编码后的公钥
* @return 解密后的字符串
* @throws Exception
*/
public static String decryptByPublicKey(String data, String publicKeyStr) throws Exception {
//Java原生base64解码
byte[] pubKey = Base64.getDecoder().decode(publicKeyStr);
//创建X509编码密钥规范
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(pubKey);
//返回转换指定算法的KeyFactory对象
KeyFactory keyFactory = KeyFactory.getInstance(RSA_KEY_ALGORITHM);
//根据X509编码密钥规范产生公钥对象
PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);
//根据转换的名称获取密码对象Cipher(转换的名称:算法/工作模式/填充模式)
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
//用公钥初始化此Cipher对象(解密模式)
cipher.init(Cipher.DECRYPT_MODE, publicKey);
//对数据解密
byte[] decrypt = cipher.doFinal(Base64.getDecoder().decode(data));
//返回字符串
return new String(decrypt);
}
}
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