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/**
 * 
 */
package com.github.ibole.infrastructure.security;

import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.Cipher;

/*********************************************************************************************.
 * 
 * 
 * Copyright 2016, iBole Inc. All rights reserved.
 * 
 * 

 *********************************************************************************************/


/**
 * @author bwang ([email protected])
 *
 */
public class RSACoder extends Coder {
  
  public static final String KEY_ALGORITHM = "RSA";
  public static final String SIGNATURE_ALGORITHM = "MD5withRSA";

  private static final String PUBLIC_KEY = "RSAPublicKey";
  private static final String PRIVATE_KEY = "RSAPrivateKey";

  /**
   * 用私钥对信息生成数字签名
   * 
   * @param data
   *            加密数据
   * @param privateKey
   *            私钥
   * 
   * @return
   * @throws Exception
   */
  public static String sign(byte[] data, String privateKey) throws Exception {
      // 解密由base64编码的私钥
      byte[] keyBytes = decryptBASE64(privateKey);

      // 构造PKCS8EncodedKeySpec对象
      PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);

      // KEY_ALGORITHM 指定的加密算法
      KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

      // 取私钥匙对象
      PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);

      // 用私钥对信息生成数字签名
      Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
      signature.initSign(priKey);
      signature.update(data);

      return encryptBASE64(signature.sign());
  }

  /**
   * 校验数字签名
   * 
   * @param data
   *            加密数据
   * @param publicKey
   *            公钥
   * @param sign
   *            数字签名
   * 
   * @return 校验成功返回true 失败返回false
   * @throws Exception
   * 
   */
  public static boolean verify(byte[] data, String publicKey, String sign)
          throws Exception {

      // 解密由base64编码的公钥
      byte[] keyBytes = decryptBASE64(publicKey);

      // 构造X509EncodedKeySpec对象
      X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);

      // KEY_ALGORITHM 指定的加密算法
      KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

      // 取公钥匙对象
      PublicKey pubKey = keyFactory.generatePublic(keySpec);

      Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
      signature.initVerify(pubKey);
      signature.update(data);

      // 验证签名是否正常
      return signature.verify(decryptBASE64(sign));
  }

  /**
   * 解密

   * 用私钥解密
   * 
   * @param data
   * @param key
   * @return
   * @throws Exception
   */
  public static byte[] decryptByPrivateKey(byte[] data, String key)
          throws Exception {
      // 对密钥解密
      byte[] keyBytes = decryptBASE64(key);

      // 取得私钥
      PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
      KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
      Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

      // 对数据解密
      Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
      cipher.init(Cipher.DECRYPT_MODE, privateKey);

      return cipher.doFinal(data);
  }

  /**
   * 解密

   * 用私钥解密
   * 
   * @param data
   * @param key
   * @return
   * @throws Exception
   */
  public static byte[] decryptByPublicKey(byte[] data, String key)
          throws Exception {
      // 对密钥解密
      byte[] keyBytes = decryptBASE64(key);

      // 取得公钥
      X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
      KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
      Key publicKey = keyFactory.generatePublic(x509KeySpec);

      // 对数据解密
      Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
      cipher.init(Cipher.DECRYPT_MODE, publicKey);

      return cipher.doFinal(data);
  }
  
  /**
   * 加密

   * 用公钥加密
   * 
   * @param data
   * @param key
   * @return
   * @throws Exception
   */
  public static byte[] encryptByPublicKey(byte[] data, String key)
          throws Exception {
      // 对公钥解密
      byte[] keyBytes = decryptBASE64(key);

      // 取得公钥
      X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
      KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
      Key publicKey = keyFactory.generatePublic(x509KeySpec);

      // 对数据加密
      Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
      cipher.init(Cipher.ENCRYPT_MODE, publicKey);

      return cipher.doFinal(data);
  }

  /**
   * 加密

   * 用私钥加密
   * 
   * @param data
   * @param key
   * @return
   * @throws Exception
   */
  public static byte[] encryptByPrivateKey(byte[] data, String key)
          throws Exception {
      // 对密钥解密
      byte[] keyBytes = decryptBASE64(key);

      // 取得私钥
      PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
      KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
      Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

      // 对数据加密
      Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
      cipher.init(Cipher.ENCRYPT_MODE, privateKey);

      return cipher.doFinal(data);
  }

  /**
   * 取得私钥
   * 
   * @param keyMap
   * @return
   * @throws Exception
   */
  public static String getPrivateKey(Map keyMap)
          throws Exception {
      Key key = (Key) keyMap.get(PRIVATE_KEY);

      return encryptBASE64(key.getEncoded());
  }

  /**
   * 取得公钥
   * 
   * @param keyMap
   * @return
   * @throws Exception
   */
  public static String getPublicKey(Map keyMap)
          throws Exception {
      Key key = (Key) keyMap.get(PUBLIC_KEY);

      return encryptBASE64(key.getEncoded());
  }

  /**
   * 初始化密钥
   * 
   * @return
   * @throws Exception
   */
  public static Map initKey() throws Exception {
      KeyPairGenerator keyPairGen = KeyPairGenerator
              .getInstance(KEY_ALGORITHM);
      keyPairGen.initialize(1024);

      KeyPair keyPair = keyPairGen.generateKeyPair();

      // 公钥
      RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();

      // 私钥
      RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

      Map keyMap = new HashMap(2);

      keyMap.put(PUBLIC_KEY, publicKey);
      keyMap.put(PRIVATE_KEY, privateKey);
      return keyMap;
  }
}