package com.matrix.core.tools;
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import java.security.Key;
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import java.security.KeyFactory;
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import java.security.KeyPair;
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import java.security.KeyPairGenerator;
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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.HashMap;
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import java.util.Map;
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import javax.crypto.Cipher;
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import org.apache.commons.codec.binary.Base64;
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/**
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* @author JIANGYOUYAO
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* @email 935090232@qq.com
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* @date 2018年5月13日
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*/
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public class RSAUtils {
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public static final String KEY_ALGORITHM = "RSA";
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public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
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private static final String PUBLIC_KEY = "RSAPublicKey";
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private static final String PRIVATE_KEY = "RSAPrivateKey";
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public static byte[] decryptBASE64(String key) {
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return Base64.decodeBase64(key);
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}
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public static String encryptBASE64(byte[] bytes) {
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return Base64.encodeBase64String(bytes);
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}
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/**
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* 用私钥对信息生成数字签名
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*
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* @param data
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* 加密数据
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* @param privateKey
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* 私钥
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* @return
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* @throws Exception
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*/
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public static String sign(byte[] data, String privateKey) throws Exception {
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// 解密由base64编码的私钥
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byte[] keyBytes = decryptBASE64(privateKey);
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// 构造PKCS8EncodedKeySpec对象
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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// KEY_ALGORITHM 指定的加密算法
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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// 取私钥匙对象
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PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
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// 用私钥对信息生成数字签名
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Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
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signature.initSign(priKey);
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signature.update(data);
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return encryptBASE64(signature.sign());
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}
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/**
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* 校验数字签名
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*
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* @param data
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* 加密数据
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* @param publicKey
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* 公钥
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* @param sign
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* 数字签名
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* @return 校验成功返回true 失败返回false
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* @throws Exception
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*/
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public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
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// 解密由base64编码的公钥
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byte[] keyBytes = decryptBASE64(publicKey);
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// 构造X509EncodedKeySpec对象
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
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// KEY_ALGORITHM 指定的加密算法
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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// 取公钥匙对象
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PublicKey pubKey = keyFactory.generatePublic(keySpec);
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Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
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signature.initVerify(pubKey);
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signature.update(data);
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// 验证签名是否正常
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return signature.verify(decryptBASE64(sign));
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}
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public static byte[] decryptByPrivateKey(byte[] data, String key) throws Exception {
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// 对密钥解密
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byte[] keyBytes = decryptBASE64(key);
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// 取得私钥
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
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// 对数据解密
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.DECRYPT_MODE, privateKey);
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return cipher.doFinal(data);
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}
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/**
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* 解密<br>
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* 用私钥解密
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*
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* @param data
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* @param key
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* @return
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* @throws Exception
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*/
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public static byte[] decryptByPrivateKey(String data, String key) throws Exception {
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return decryptByPrivateKey(decryptBASE64(data), key);
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}
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/**
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* 解密<br>
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* 用公钥解密
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*
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* @param data
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* @param key
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* @return
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* @throws Exception
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*/
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public static byte[] decryptByPublicKey(byte[] data, String key) throws Exception {
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// 对密钥解密
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byte[] keyBytes = decryptBASE64(key);
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// 取得公钥
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X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key publicKey = keyFactory.generatePublic(x509KeySpec);
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// 对数据解密
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.DECRYPT_MODE, publicKey);
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return cipher.doFinal(data);
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}
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/**
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* 加密<br>
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* 用公钥加密
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*
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* @param data
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* @param key
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* @return
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* @throws Exception
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*/
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public static byte[] encryptByPublicKey(String data, String key) throws Exception {
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// 对公钥解密
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byte[] keyBytes = decryptBASE64(key);
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// 取得公钥
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X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key publicKey = keyFactory.generatePublic(x509KeySpec);
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// 对数据加密
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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return cipher.doFinal(data.getBytes());
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}
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/**
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* 加密<br>
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* 用私钥加密
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*
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* @param data
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* @param key
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* @return
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* @throws Exception
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*/
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public static byte[] encryptByPrivateKey(byte[] data, String key) throws Exception {
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// 对密钥解密
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byte[] keyBytes = decryptBASE64(key);
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// 取得私钥
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
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// 对数据加密
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.ENCRYPT_MODE, privateKey);
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return cipher.doFinal(data);
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}
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/**
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* 取得私钥
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*
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* @param keyMap
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* @return
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* @throws Exception
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*/
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public static String getPrivateKey(Map<String, Key> keyMap) throws Exception {
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Key key = (Key) keyMap.get(PRIVATE_KEY);
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return encryptBASE64(key.getEncoded());
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}
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/**
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* 取得公钥
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*
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* @param keyMap
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* @return
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* @throws Exception
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*/
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public static String getPublicKey(Map<String, Key> keyMap) throws Exception {
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Key key = keyMap.get(PUBLIC_KEY);
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return encryptBASE64(key.getEncoded());
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}
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/**
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* 初始化密钥
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*
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* @return
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* @throws Exception
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*/
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public static Map<String, Key> initKey() throws Exception {
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KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
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keyPairGen.initialize(1024);
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KeyPair keyPair = keyPairGen.generateKeyPair();
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Map<String, Key> keyMap = new HashMap<>(2);
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// 公钥
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keyMap.put(PUBLIC_KEY, keyPair.getPublic());
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// 私钥
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keyMap.put(PRIVATE_KEY, keyPair.getPrivate());
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return keyMap;
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}
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}
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