加密-解密

package com.vispractice.vpshop.util;

import java.io.UnsupportedEncodingException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.KeyGenerator;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

public class CryptoUtil {

private static final String[] hexDigits = { "0", "1", "2", "3", "4", "5",

"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

public static String aesEncrypt(String origin, String key) {

try {

SecretKey secretKey = getSecretKey(key);

SecretKeySpec keySpec = getSecretKeySpec(secretKey);

Cipher cipher = Cipher.getInstance("AES");

cipher.init(1, keySpec);

byte[] result = cipher.doFinal(origin.getBytes("UTF-8"));

return byteArrayToHexString(result);

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (NoSuchPaddingException e) {

e.printStackTrace();

} catch (IllegalBlockSizeException e) {

e.printStackTrace();

} catch (BadPaddingException e) {

e.printStackTrace();

} catch (InvalidKeyException e) {

e.printStackTrace();

}

return null;

}

private static String byteArrayToHexString(byte[] b) {

StringBuffer resultSb = new StringBuffer();

for (int i = 0; i < b.length; i++) {

resultSb.append(byteToHexString(b[i]));

}

return resultSb.toString().toUpperCase();

}

private static String byteToHexString(byte b) {

int n = b;

if (n < 0)

n += 256;

int d1 = n / 16;

int d2 = n % 16;

return hexDigits[d1] + hexDigits[d2];

}

public static String aesDecrypt(String origin, String key) {

try {

SecretKey secretKey = getSecretKey(key);

SecretKeySpec keySpec = getSecretKeySpec(secretKey);

Cipher cipher = Cipher.getInstance("AES");

cipher.init(2, keySpec);

byte[] result = cipher.doFinal(parseHexStr2Byte(origin));

return new String(result);

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (IllegalBlockSizeException e) {

e.printStackTrace();

} catch (BadPaddingException e) {

e.printStackTrace();

} catch (InvalidKeyException e) {

e.printStackTrace();

} catch (NoSuchPaddingException e) {

e.printStackTrace();

}

return null;

}

private static SecretKeySpec getSecretKeySpec(SecretKey secretKey) {

byte[] keyEncoded = secretKey.getEncoded();

SecretKeySpec keySpec = new SecretKeySpec(keyEncoded, "AES");

return keySpec;

}

private static SecretKey getSecretKey(String secretKey)

throws NoSuchAlgorithmException {

KeyGenerator _generator = KeyGenerator.getInstance("AES");

SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");

secureRandom.setSeed(secretKey.getBytes());

_generator.init(128, secureRandom);

return _generator.generateKey();

}

private 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;

}

public static void main(String[] args) {

//  System.out.println(aesDecrypt("A76199CA8307801FD33FB811191FE137",

//  "vispractice"));

System.out.println(aesEncrypt("HNhuinong@888", "vispractice"));

}

}