1. package com.jideos.jnotes.utils;
    3. import cn.hutool.core.codec.Base64;
    4. import org.springframework.stereotype.Component;
    6. import javax.crypto.Cipher;
    7. import java.security.KeyFactory;
    8. import java.security.PrivateKey;
    9. import java.security.PublicKey;
    10. import java.security.spec.PKCS8EncodedKeySpec;
    11. import java.security.spec.X509EncodedKeySpec;
    13. /**
    14.  * 非对称加密公钥和私钥
    15.  *
    16.  * @author 杨胖胖
    17.  */
    18. @Component
    19. public class RsaUtil {
    20.     private final static String PRIVATE_KEY = "MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAgPlRaU1JWFaWcadfAN/EnmvxTADfpszOj2J6xagn2uZSQ1VtuTaGPE2M8uqdcD+dyUZH0+M0kWWc2AzqtTLOPQIDAQABAkBFXtSNIQbcPuZ4hx+wZqto0oJc8PNa0jogIUYL3mBhelE1YsKxCvuNnJzYIJr/aa9tUX6Oi4s6sZM6IC4ALec5AiEAt8cLB7pcJVoc9Al+P8jADb4q1mtb8+Vin79ADLAExOMCIQCzqMBW5CE2MNct334IzNYuv7PATo6lu+GnntbyUsWqXwIgWYmWbCt13ZTr6lH9uqHaQFfYkyM3Z7rotB//2q6fhDUCIQCGIvFwLqXJUw/llR8BrQYhI0ouw7hnb26cetCbXkds2wIgRZuMzZRTAOOhiJsLWW0o6GEMljc0Dff69RFdA/XqBd4=";
    21.     private final static String PUBLIC_KEY = "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAID5UWlNSVhWlnGnXwDfxJ5r8UwA36bMzo9iesWoJ9rmUkNVbbk2hjxNjPLqnXA/nclGR9PjNJFlnNgM6rUyzj0CAwEAAQ==";
    22.     private final static String ALGORITHM = "RSA";
    24.     /**
    25.      * 私钥加密
    26.      *
    27.      * @param data 待加密数据
    28.      * @return byte[] 加密数据
    29.      */
    30.     public byte[] encryptByPrivateKey(byte[] data) throws Exception {
    31.         //取得私钥
    32.         PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(Base64.decode(PRIVATE_KEY));
    33.         KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);
    34.         //生成私钥
    35.         PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
    36.         //数据加密
    37.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    38.         cipher.init(Cipher.ENCRYPT_MODE, privateKey);
    39.         return cipher.doFinal(data);
    40.     }
    42.     /**
    43.      * 公钥加密
    44.      *
    45.      * @param data 待加密数据
    46.      * @return byte[] 加密数据
    47.      */
    48.     public byte[] encryptByPublicKey(byte[] data) throws Exception {
    49.         //实例化密钥工厂
    50.         KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);
    51.         //初始化公钥
    52.         //密钥材料转换
    53.         X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(Base64.decode(PUBLIC_KEY));
    54.         //产生公钥
    55.         PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
    57.         //数据加密
    58.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    59.         cipher.init(Cipher.ENCRYPT_MODE, pubKey);
    60.         return cipher.doFinal(data);
    61.     }
    63.     /**
    64.      * 私钥解密
    65.      *
    66.      * @param data 待解密数据
    67.      * @return byte[] 解密数据
    68.      */
    69.     public byte[] decryptByPrivateKey(byte[] data) throws Exception {
    70.         //取得私钥
    71.         PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(Base64.decode(PRIVATE_KEY));
    72.         KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);
    73.         //生成私钥
    74.         PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
    75.         //数据解密
    76.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    77.         cipher.init(Cipher.DECRYPT_MODE, privateKey);
    78.         return cipher.doFinal(data);
    79.     }
    81.     /**
    82.      * 公钥解密
    83.      *
    84.      * @param data 待解密数据
    85.      * @return byte[] 解密数据
    86.      */
    87.     public byte[] decryptByPublicKey(byte[] data) throws Exception {
    88.         //实例化密钥工厂
    89.         KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);
    90.         //初始化公钥
    91.         //密钥材料转换
    92.         X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(Base64.decode(PUBLIC_KEY));
    93.         //产生公钥
    94.         PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
    95.         //数据解密
    96.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    97.         cipher.init(Cipher.DECRYPT_MODE, pubKey);
    98.         return cipher.doFinal(data);
    99.     }
    100. }