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package com.young.security;

import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

import com.young.security.utils.Base64;


public class ServerRSA {
	

	String privatekey  =  "MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAN7S9ByCdSoQ6x01"
			+ "7k4iRh1NFUsksJg1Jxrv68gwXU94Uzzgze0vwj6lut3QrWJEJD2aTRoqwxpSSGtf"
			+ "tl4IjOJlybS1Lfrj91Dh5AECb3wzikSP0iO7CaGXgtscNcl7+eHXB3v7JwMH0va2"
			+ "QokDJsHR8/zpxlMq81cHjrCjeUnPAgMBAAECgYEA3lg6Zsh3CYbgVcGfDjB9Lnfg"
			+ "q57s6LUBVIvcB2LbeZVj2fepBOkHN2RA116H5OqCD0aNcXMCRJ2eziYv4B1AFjwf"
			+ "nvhnx8ZuJhLTr8ae6zX+AxpZsRslOe0emoJwYoH8U3nFU6CeuXsLiTwMvKgqyQy3"
			+ "uFD7vWR82haAFFdZD8ECQQD/upc1PFDPISBHRJ/22qJOU73DK+Rl2aJ1TimTlnll"
			+ "QO0w/5oNqZO843+Sl3LbLZBuZdw+KeyFmPhmS/56cb8XAkEA3w9ulEIF2M9waIo6"
			+ "4GaKvQNRsz+PuE/ffo6rHBENV9m9HZBzNv9IM8nKQYlzDd96G9Ig0v3hlFrUTkMj"
			+ "j54+CQJATbiZ6BYSwUDiHIbgzxeXqJKO49hdLA8+7sP4ouBiuMFI1VF5splNS2Uh"
			+ "Cp54y+BHOyY+D66SMfBR3lVOXExhtQJAdTge3Dp16CHa6JT7q8E3V2zPGmtkk28l"
			+ "+9Pth6pOYMRD5a1rXpN41f5NE3OvyrKN8ODT7w0L5nJ070vI/EgkQQJAO/uNumHj"
			+ "KMLKLabQKzjgOFOxB3zDv1jWt4ZR0d9itSoebBv/TgZt/6SaOEMYVDW0xMofJaZL"
			+ "E0LJ5lmURiV1eQ==";

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ClientRSA rsac = new ClientRSA();
		System.out.println(rsac.encode("xx"));
		ServerRSA rsa = new ServerRSA();
		System.out.println(rsa.decoder(rsac.encode("xx")));

		
		System.out.println(rsa.encode("你是谁啊测试下哦"));
		System.out.println(rsac.decoder(rsa.encode("你是谁啊测试下哦")));

	}

	public String encode(String r) {
		String reslut = "";
		try {
			RSAPrivateKey p = getPrivateKey(privatekey);
			byte[] y;
			y = encrypt(p, r.getBytes());
			reslut = Base64.encode(y);

		} catch (InvalidKeyException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (BadPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvalidKeySpecException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return reslut;

	}
	public String decoder(String r) {
		String reslut = "";
		try {
			RSAPrivateKey p = getPrivateKey(privatekey);
			byte[] y;
			y = decrypt(p, Base64.decode(r));
			reslut=new String(y);
		} catch (InvalidKeyException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (BadPaddingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvalidKeySpecException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return reslut;

	}

	/**
	 * 加密
	 * 
	 * @param publicKey
	 * @param srcBytes
	 * @return
	 * @throws NoSuchAlgorithmException
	 * @throws NoSuchPaddingException
	 * @throws InvalidKeyException
	 * @throws IllegalBlockSizeException
	 * @throws BadPaddingException
	 */
	private byte[] encrypt(RSAPublicKey publicKey, byte[] srcBytes)
			throws NoSuchAlgorithmException, NoSuchPaddingException,
			InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
		if (publicKey != null) {
			// Cipher负责完成加密或解密工作，基于RSA
			Cipher cipher = Cipher.getInstance("RSA");
			// 根据公钥，对Cipher对象进行初始化
			cipher.init(Cipher.ENCRYPT_MODE, publicKey);
			byte[] resultBytes = cipher.doFinal(srcBytes);
			return resultBytes;
		}
		return null;
	}

	/**
	 * 加密
	 * 
	 * @param publicKey
	 * @param srcBytes
	 * @return
	 * @throws NoSuchAlgorithmException
	 * @throws NoSuchPaddingException
	 * @throws InvalidKeyException
	 * @throws IllegalBlockSizeException
	 * @throws BadPaddingException
	 */
	private byte[] encrypt(RSAPrivateKey publicKey, byte[] srcBytes)
			throws NoSuchAlgorithmException, NoSuchPaddingException,
			InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
		if (publicKey != null) {
			// Cipher负责完成加密或解密工作，基于RSA
			Cipher cipher = Cipher.getInstance("RSA");
			// 根据公钥，对Cipher对象进行初始化
			cipher.init(Cipher.ENCRYPT_MODE, publicKey);
			byte[] resultBytes = cipher.doFinal(srcBytes);
			return resultBytes;
		}
		return null;
	}

	/**
	 * 解密
	 * 
	 * @param privateKey
	 * @param srcBytes
	 * @return
	 * @throws NoSuchAlgorithmException
	 * @throws NoSuchPaddingException
	 * @throws InvalidKeyException
	 * @throws IllegalBlockSizeException
	 * @throws BadPaddingException
	 */
	private byte[] decrypt(RSAPrivateKey privateKey, byte[] srcBytes)
			throws NoSuchAlgorithmException, NoSuchPaddingException,
			InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
		if (privateKey != null) {
			// Cipher负责完成加密或解密工作，基于RSA
			Cipher cipher = Cipher.getInstance("RSA");
			// 根据公钥，对Cipher对象进行初始化
			cipher.init(Cipher.DECRYPT_MODE, privateKey);
			byte[] resultBytes = cipher.doFinal(srcBytes);
			return resultBytes;
		}
		return null;
	}

	private static RSAPrivateKey getPrivateKey(String x)
			throws NoSuchAlgorithmException, InvalidKeySpecException,
			IOException {

		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(
				Base64.decode(x));
		RSAPrivateKey privateKey = (RSAPrivateKey) keyFactory
				.generatePrivate(priPKCS8);
		return privateKey;
	}

	private static RSAPublicKey getPublicKey(String x)
			throws NoSuchAlgorithmException, InvalidKeySpecException,
			IOException {

		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		X509EncodedKeySpec priPKCS8 = new X509EncodedKeySpec(
				Base64.decode(x));
		RSAPublicKey privateKey = (RSAPublicKey) keyFactory
				.generatePublic(priPKCS8);
		return privateKey;
	}
}