package com.qxueyou.scc.base.util;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.SecureRandom;

public class AESUtil {

	public static final String charset = "UTF-8";
	private static final String IV = "1234567812345678";
	private static final String defaultPasswd = "0120302323012324";
	
	public static String encrypt(String cleartext) {
		return encrypt(defaultPasswd,cleartext);
	}

	public static String encrypt(String dataPassword, String cleartext) {
		try {
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
			SecretKeySpec key = new SecretKeySpec(dataPassword.getBytes(), "AES");
			IvParameterSpec iv = new IvParameterSpec(IV.getBytes());
			cipher.init(Cipher.ENCRYPT_MODE, key, iv);
			byte[] encryptedData = cipher.doFinal(cleartext.getBytes(charset));
			return new String(parseByte2HexStr(encryptedData));
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

	public static String decrypt(String cleartext) {
		return decrypt(defaultPasswd,cleartext);
	}
	
	public static String decrypt(String dataPassword, String encrypted) {
		try {
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
			SecretKeySpec key = new SecretKeySpec(dataPassword.getBytes(), "AES");
			IvParameterSpec iv = new IvParameterSpec(IV.getBytes());
			byte[] byteMi = parseHexStr2Byte(encrypted);
			cipher.init(Cipher.DECRYPT_MODE, key, iv);
			byte[] decryptedData = cipher.doFinal(byteMi);
			return new String(decryptedData, charset);
		} catch (Exception e) {
			return null;
		}
	}

	/**
	 * 将16进制转换为二进制
	 * 
	 * @param hexStr
	 * @return
	 */
	public static byte[] parseHexStr2Byte(String hexStr) {
		if (hexStr.length() < 1) {
			return null;
		}
		byte[] result = new byte[hexStr.length() / 2];
		for (int i = 0; i < hexStr.length() / 2; i++) {
			int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
			int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
			result[i] = (byte) (high * 16 + low);
		}
		return result;
	}

	/**
	 * 将二进制转换成16进制
	 * 
	 * @param buf
	 * @return
	 */
	public static String parseByte2HexStr(byte buf[]) {
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < buf.length; i++) {
			String hex = Integer.toHexString(buf[i] & 0xFF);
			if (hex.length() == 1) {
				sb.append('0');
			}
			sb.append(hex.toUpperCase());
		}
		return sb.toString();
	}
	
	/**
	 * AES解密
	 */
	public static String decode(String aesKey, String encryptText) {
		try {
			KeyGenerator _generator = KeyGenerator.getInstance("AES");
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			secureRandom.setSeed(aesKey.getBytes());
			_generator.init(128, secureRandom);
			SecretKey secretKey = _generator.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");
			cipher.init(Cipher.DECRYPT_MODE, key);
			byte[] result = cipher.doFinal(AESUtil.parseHexStr2Byte(encryptText));
			return new String(result);
		} catch (Exception e) {
			return "";
		}
	}
	
	public static void main(String[] args) {
		
		String publicKey = "30820122300d06092a864886f70d01010105000382010f00303032301006\n" + 
				"072a8648ce3d02002EC311215SHA512withECDSA106052b81040006031e0\n" + 
				"0042cac6fdede70a68027b03be32f81a2c3aca6a715e6937abcc6277e0fG\n" + 
				"82010a028201010097beb94bc6a412279fdcf7b9696279a2dad43e4c0589\n" + 
				"5ce1d14057fa4e60da48e38c0bed81cc668465213dec624fbde46c379468\n" + 
				"1fa1a9fe05ae4595cd82c09cf0a4cea909efd43b8993dffcb2b86d8cdccf\n" + 
				"1986392d60bcbf8aaf0c03RSA4204813SHA512withRSA1b5a1f66abe2be9\n" + 
				"dd9c23b1efbaa48dc9727d1899765d37901d37403af214e45fbdf6831845\n" + 
				"e762cd227c3fa0d0960346b23e30da429881ca3a26a20dcc3c08bba66927\n" + 
				"e1e742184dc92ed0dc61ec97313b5239d47b1099f154928dd06c149c0ae2\n" + 
				"9e6a04674454f89bbf466aa2527138e061a1d85f08bbd4dc0d9f3b3494d0\n" + 
				"c8a406830fe981ee905719082c23767f6e0c59df143549786f5e28587eb4\n" + 
				"f7ba4f8549aff0203010001\n";


		
		System.out.println(decrypt(publicKey));
	}
	
}