RSA加密解密——绕过OpenSSL

package cn.xx.util;

import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import javax.crypto.Cipher;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class RSAEncrypt {
    Logger logger = LoggerFactory.getLogger(getClass());
    @Value("${hr.qtbprivatekey}")
    private String qtbprivatekey;
//    @Value("${hr.qtbpublickey}")
//    private String qtbpublickey;
    
    /**
     * 私钥加密
     * @param msg
     * @return
     */
    public String getRsaPubKey(String msg) {
        String messageEn = null;
        try {
            messageEn = encrypt2(msg,qtbprivatekey);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        logger.info(msg + "\t私钥加密后的字符串为:",messageEn);
        return messageEn;
    }
    
    

    /** 
     * RSA公钥加密 
     *  
     * @param str 
     *            加密字符串
     * @param publicKey 
     *            公钥 
     * @return 密文 
     * @throws Exception 
     *             加密过程中的异常信息 
     */  
    public static String encrypt( String str, String publicKey ) throws Exception{
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(publicKey);
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
        return outStr;
    }
    
    /** 
     * RSA私钥加密 
     *  
     * @param str 
     *            加密字符串
     * @param privateKey 
     *            公钥 
     * @return 密文 
     * @throws Exception 
     *             加密过程中的异常信息 
     */ 
    public static String encrypt2( String str, String privateKey ) throws Exception{
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(privateKey);
        RSAPrivateKey pubKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
        return outStr;
    }

    /** 
     * RSA私钥解密
     *  
     * @param str 
     *            加密字符串
     * @param privateKey 
     *            私钥 
     * @return 铭文
     * @throws Exception 
     *             解密过程中的异常信息 
     */  
    public static String decrypt(String str, String privateKey) throws Exception{
        //64位解码加密后的字符串
        byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
        //base64编码的私钥
        byte[] decoded = Base64.decodeBase64(privateKey);  
        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));  
        //RSA解密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, priKey);
        String outStr = new String(cipher.doFinal(inputByte));
        return outStr;
    }
    
    /** 
     * RSA公钥解密
     *  
     * @param str 
     *            加密字符串
     * @param publicKey 
     *            私钥 
     * @return 铭文
     * @throws Exception 
     *             解密过程中的异常信息 
     */  
    public static String decrypt2(String str, String publicKey) throws Exception{
        //64位解码加密后的字符串
        byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
        //base64编码的私钥
        byte[] decoded = Base64.decodeBase64(publicKey);  
        RSAPublicKey priKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));  
        //RSA解密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, priKey);
        String outStr = new String(cipher.doFinal(inputByte));
        return outStr;
    }
    
    public static void main(String[] args) throws Exception {
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");  
        // 初始化密钥对生成器，密钥大小为96-1024位  
        keyPairGen.initialize(1024,new SecureRandom());  
        // 生成一个密钥对，保存在keyPair中  
        KeyPair keyPair = keyPairGen.generateKeyPair();  
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();   // 得到私钥  
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  // 得到公钥  
        
        String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded())); 
        System.out.println("随机生成的公钥为:" + publicKeyString);
        // 得到私钥字符串  
        String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));  
        System.out.println("随机生成的私钥为:" + privateKeyString);
        String message = "df723820";
        String messageEn = encrypt2(message, privateKeyString);
        System.out.println(message + "\t私钥加密后的字符串为:" + messageEn);
        String messageDe = decrypt2(messageEn, publicKeyString);
        System.out.println("还原后的字符串为:" + messageDe);
    }
}