package com.ruoyi.system.utils.util;
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import javax.crypto.Cipher;
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import java.nio.charset.StandardCharsets;
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import java.security.KeyFactory;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.Signature;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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import java.util.Base64;
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/**
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* rsa工具类
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*
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* @author xuwenbing
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* @date 2019-06-12
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*/
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public class RsaSimpleUtil {
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private static final String RSA = "RSA";
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private static final String MD5withRSA = "MD5withRSA";
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/**
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* 加密
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*
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* @param source
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* @param publicKeyBase64
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* @return
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*/
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public static String encrypt(String source, String publicKeyBase64) throws Exception {
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// 获取publicKey
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byte[] publicKeyBytes = Base64.getDecoder().decode(publicKeyBase64.getBytes(StandardCharsets.UTF_8));
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(RSA);
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PublicKey publicKey = keyFactory.generatePublic(keySpec);
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// 数据加密
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Cipher cipher = Cipher.getInstance(RSA);
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cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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byte[] encryptBytes = cipher.doFinal(source.getBytes(StandardCharsets.UTF_8));
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return Base64.getEncoder().encodeToString(encryptBytes);
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}
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/**
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* 解密
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*
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* @param encrypted
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* @param privateKeyBase64
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* @return
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*/
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public static String decrypt(String encrypted, String privateKeyBase64) throws Exception {
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// 获取privateKey
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byte[] privateKeyBytes = Base64.getDecoder().decode(privateKeyBase64.getBytes(StandardCharsets.UTF_8));
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PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(RSA);
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PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
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// 解密数据
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Cipher cipher = Cipher.getInstance(RSA);
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cipher.init(Cipher.DECRYPT_MODE, privateKey);
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byte[] decryptBytes = cipher.doFinal(Base64.getDecoder().decode(encrypted));
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return new String(decryptBytes, StandardCharsets.UTF_8);
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}
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/**
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* 签名
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*
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* @param source
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* @param privateKeyBase64
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* @return
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*/
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public static String sign(String source, String privateKeyBase64) throws Exception {
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// 获取privateKey
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byte[] privateKeyBytes = Base64.getDecoder().decode(privateKeyBase64.getBytes(StandardCharsets.UTF_8));
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PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(RSA);
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PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
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// 签名
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Signature signature = Signature.getInstance(MD5withRSA);
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signature.initSign(privateKey);
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signature.update(source.getBytes(StandardCharsets.UTF_8));
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byte[] signed = signature.sign();
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return Base64.getEncoder().encodeToString(signed);
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}
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/**
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* 验签
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*
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* @param source
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* @param signed
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* @param publicKeyBase64
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* @return
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*/
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public static boolean verify(String source, String signed, String publicKeyBase64) throws Exception {
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// 获取publicKey
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byte[] publicKeyBytes = Base64.getDecoder().decode(publicKeyBase64.getBytes(StandardCharsets.UTF_8));
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(RSA);
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PublicKey publicKey = keyFactory.generatePublic(keySpec);
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// 验签
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Signature signature = Signature.getInstance(MD5withRSA);
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signature.initVerify(publicKey);
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signature.update(source.getBytes(StandardCharsets.UTF_8));
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boolean verify = signature.verify(Base64.getDecoder().decode(signed));
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return verify;
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}
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}
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