RSA+Base64加解密Java工具類RSAUtil

RSA+Base64加解密Java工具類RSAUtil（公鑰和私鑰請自行生成）

import java.io.IOException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Properties;
import javax.crypto.Cipher;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class RSAUtil {
    /**
     * RSA+BASE64加密（先RSA加密，然后Base64加密）
     * @param secretContent：secretContent要加密的內容
     * @return
     */
    public static String encrypt(String secretContent) {
        String byte2Base64 = "";
        try {
            //===============生成公鑰和私鑰，公鑰傳給客戶端，私鑰服務端保留==================
            //生成RSA公鑰和私鑰，並Base64編碼
            String filePath = "key.properties";
            Properties prop = new Properties();
            String PRIVATEKEY = null;
            String PUBLICKEY = null;
            prop.load(RSAUtil.class.getClassLoader().getResourceAsStream(filePath));
            PRIVATEKEY = prop.getProperty("PRIVATEKEY");
            PUBLICKEY = prop.getProperty("PUBLICKEY");
            //=================客戶端================
            //將Base64編碼后的公鑰轉換成PublicKey對象
            PublicKey publicKey = string2PublicKey(PUBLICKEY);
            //用公鑰加密
            byte[] publicEncrypt = publicEncrypt(secretContent.getBytes(), publicKey);
            //加密后的內容Base64編碼
            byte2Base64 = byte2Base64(publicEncrypt);
            System.out.println(byte2Base64);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return byte2Base64;
    }

    /**
     * BASE64+RAS解密（先Base64解密，然后RSA解密）
     * @param decodeContent ：解密字符串
     */
    public static String decode(String decodeContent) {
    	 byte[] privateDecrypt = new byte[] {};
        try {
            //===============生成公鑰和私鑰，公鑰傳給客戶端，私鑰服務端保留==================
            //生成RSA公鑰和私鑰，並Base64編碼
            String filePath = "key.properties";
            Properties prop = new Properties();
            String PRIVATEKEY = null;
            String PUBLICKEY = null;
            prop.load(RSAUtil.class.getClassLoader().getResourceAsStream(filePath));
            PRIVATEKEY = prop.getProperty("PRIVATEKEY");
            PUBLICKEY = prop.getProperty("PUBLICKEY");
            //===================服務端================
            //將Base64編碼后的私鑰轉換成PrivateKey對象
            PrivateKey privateKey = string2PrivateKey(PRIVATEKEY);
            //加密后的內容Base64解碼
            byte[] base642Byte = base642Byte(decodeContent);
            //用私鑰解密
           privateDecrypt = privateDecrypt(base642Byte, privateKey);
           
        }catch(Exception e) {
        	e.printStackTrace();
        }
        return  new String(privateDecrypt);
    }
    //生成秘鑰對
    public static KeyPair getKeyPair() throws Exception {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(2048);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        return keyPair;
    }
    
    //獲取公鑰(Base64編碼)
    public static String getPublicKey(KeyPair keyPair){
        PublicKey publicKey = keyPair.getPublic();
        byte[] bytes = publicKey.getEncoded();
        return byte2Base64(bytes);
    }
    
    //獲取私鑰(Base64編碼)
    public static String getPrivateKey(KeyPair keyPair){
        PrivateKey privateKey = keyPair.getPrivate();
        byte[] bytes = privateKey.getEncoded();
        return byte2Base64(bytes);
    }
    
    //將Base64編碼后的公鑰轉換成PublicKey對象
    public static PublicKey string2PublicKey(String pubStr) throws Exception{
        byte[] keyBytes = base642Byte(pubStr);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(keySpec);
        return publicKey;
    }
    
    //將Base64編碼后的私鑰轉換成PrivateKey對象
    public static PrivateKey string2PrivateKey(String priStr) throws Exception{
        byte[] keyBytes = base642Byte(priStr);
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
        return privateKey;
    }
    
    //公鑰加密
    public static byte[] publicEncrypt(byte[] content, PublicKey publicKey) throws Exception{
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] bytes = cipher.doFinal(content);
        return bytes;
    }
    
    //私鑰解密
    public static byte[] privateDecrypt(byte[] content, PrivateKey privateKey) throws Exception{
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] bytes = cipher.doFinal(content);
        return bytes;
    }
    
    //字節數組轉Base64編碼
    public static String byte2Base64(byte[] bytes){
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(bytes);
    }
    
    //Base64編碼轉字節數組
    public static byte[] base642Byte(String base64Key) throws IOException{
        BASE64Decoder decoder = new BASE64Decoder();
        return decoder.decodeBuffer(base64Key);
    }
}

key.properties(結尾加上“\”是為了換行識別)

PUBLICKEY=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDlukf0JloB6RyjRZRid4JIoQ86\
m40o0wI7uHj6zqG/OYjpbu2SZ7FLEFNlzng+in8XUBvHrC+i9hAlho0Giix7SQEQ\
u43l05FbHQrIqBQCOgwMbg4h5FZlILXJfcXCLlFXOSC5dcDvXAEfBNpqFNAIdlOW\
drNvBpMnjzd9L+U2xQIDAQAB
PRIVATEKEY=MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBAOW6R/QmWgHpHKNF\
lGJ3gkihDzqbjSjTAju4ePrOob85iOlu7ZJnsUsQU2XOeD6KfxdQG8esL6L2ECWG\
jQaKLHtJARC7jeXTkVsdCsioFAI6DAxuDiHkVmUgtcl9xcIuUVc5ILl1wO9cAR8E\
2moU0Ah2U5Z2s28GkyePN30v5TbFAgMBAAECgYB87QMqAx0ZQuJe63yY23KO+n7k\
mSh3VeA2B8hKY8nTyn7oqnkpD5h7QIKJr3D2WaxpShgBSmKRVQxMy9GvB77NuIB0\
swQcyMcVU7FtwfwQ+SwxmcDgl716sjs0D4p9HrSSubpboOo2bHIKgr1XlXnWMJ5s\
ElKMj5HTNPTCJWQzoQJBAPfw8/2ikO5KM6rC73GrIYTuLyMf1TqYsCxT0KXThwF+\
ksCtIdUZlgJGwscSiUhPmPTbDBMhb9hYaEkOe7VESz0CQQDtMcc5Ig+5BgftqtCI\
RvdpZAnFZmYsUqdCKZi9+34e3mEne4jHLZP10HaRsf72T87fgEAUx/jFufKmQ4Dv\
hHIpAkEAwxvFpO3shte1WMcVjalRMz4LseQ282l8GSXLpvKR5scnzJ9xZDRCK4Br\
fiREC7c3cld9ZQCG9wR67CKNjtMzMQJBAOjA7hQcXn1bc7A+7D6uFN5wcj4oy542\
xTZhhyb2gL5dzcxmpsN88DJJC/DQT7b4fbJIMZmy2WV9oKSSnRVsTHECQQDfYQMC\
a9tLDZZXln0d8SVzLXlZCecESTFlaoDcyoos8cGQ0jXOuXqt82irKgxK8q2qoKu0\
qJDFVLAAlIGcGhbH

大致用法：

String USERNAME = request.getParameter("username");
String PASSWORD =request.getParameter("password");
USERNAME = USERNAME.replace(" ", "+");//替換里面的"+"
PASSWORD = PASSWORD.replace(" ", "+");//替換里面的"+"
//USERNAME=USERNAME.replaceAll(" ","\\\r\\\n");//jemeter使用
//PASSWORD=PASSWORD.replaceAll( " ","\\\r\\\n");//jemeter使用
 ...
 USERNAME = RSAUtil.decode(USERNAME);
 PASSWORD = RSAUtil.decode(PASSWORD);
 ...