package com.xiongyingqi.util;
import javax.crypto.*;
import javax.crypto.spec.DESKeySpec;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
/**
* Created by xiongyingqi on 14-3-10.
*/
public class MessageEncryptionHelper {
public static final boolean toUpperCase = true;
/**
* 将摘要信息转换为相应的编码
*
* @param code 编码类型
* @param message 摘要信息
* @return 相应的编码字符串
*/
private static String encode(String code, String message) {
return encode(code, message.getBytes());
}
private static String encode(String code, byte[] message) {
MessageDigest md;
String encode = null;
try {
md = MessageDigest.getInstance(code);
encode = byteArrayToHexString(md.digest(message));
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return encode;
}
private static String byteArrayToHexString(byte[] digest) {
StringBuffer md5StrBuff = new StringBuffer();
for (int i = 0; i < digest.length; i++) {
if (Integer.toHexString(0xFF & digest[i]).length() == 1) {
md5StrBuff.append("0").append(Integer.toHexString(0xFF & digest[i]));
} else {
String hex = Integer.toHexString(0xFF & digest[i]);
if (toUpperCase) {
hex = hex.toUpperCase();
}
md5StrBuff.append(hex);
}
}
return md5StrBuff.toString();
}
/**
* 将摘要信息转换成MD5编码
*
* @param message 摘要信息
* @return MD5编码之后的字符串
*/
public static String md5Encode(String message) {
return encode("MD5", message);
}
/**
* 将摘要信息转换成SHA编码
*
* @param message 摘要信息
* @return SHA编码之后的字符串
*/
public static String shaEncode(String message) {
return encode("SHA", message);
}
/**
* 将摘要信息转换成SHA-256编码
*
* @param message 摘要信息
* @return SHA-256编码之后的字符串
*/
public static String sha256Encode(String message) {
return encode("SHA-256", message);
}
/**
* 将摘要信息转换成SHA-512编码
*
* @param message 摘要信息
* @return SHA-512编码之后的字符串
*/
public static String sha512Encode(String message) {
return encode("SHA-512", message);
}
/**
* 将摘要信息转换成SHA编码
*
* @param message 摘要信息
* @return SHA编码之后的字符串
*/
public static String shaEncode(byte[] message) {
return encode("SHA", message);
}
/**
* 将摘要信息转换成SHA-256编码
*
* @param message 摘要信息
* @return SHA-256编码之后的字符串
*/
public static String sha256Encode(byte[] message) {
return encode("SHA-256", message);
}
/**
* 将摘要信息转换成SHA-512编码
*
* @param message 摘要信息
* @return SHA-512编码之后的字符串
*/
public static String sha512Encode(byte[] message) {
return encode("SHA-512", message);
}
/**
* 加密方法
* <pre>
* // 1.1 首先要创建一个密匙
* // DES算法要求有一个可信任的随机数源
* SecureRandom sr = new SecureRandom();
* // 为我们选择的DES算法生成一个KeyGenerator对象
* KeyGenerator kg = KeyGenerator.getInstance("DES");
* kg.init(sr);
* // 生成密匙
* SecretKey key = kg.generateKey();
* // 获取密匙数据
* byte rawKeyData[] = key.getEncoded();
* // byte rawKeyData[] = "sucretsa".getBytes();
* System.out.println("密匙长度===" + rawKeyData.length);
* System.out.println("密匙Base64===" + Base64.encodeBytes(rawKeyData));
*
* String str = "hi.baidu.com/beijingalana"; // 待加密数据
* // 2.1 调用加密方法
* byte[] encryptedData = desEncrypt(rawKeyData, str.getBytes());
* // 3.1 调用解密方法
* byte[] decrypt = desDecrypt(rawKeyData, encryptedData);
* System.out.println("解密===" + new String(decrypt));
* </pre>
*
* @param rawKeyData 密钥
* @param data 要加密的数据
* @throws java.security.InvalidKeyException
* @throws NoSuchAlgorithmException
* @throws javax.crypto.IllegalBlockSizeException
* @throws javax.crypto.BadPaddingException
* @throws javax.crypto.NoSuchPaddingException
* @throws java.security.spec.InvalidKeySpecException
*/
public static byte[] desEncrypt(byte rawKeyData[], byte[] data)
throws InvalidKeyException, NoSuchAlgorithmException,
IllegalBlockSizeException, BadPaddingException,
NoSuchPaddingException, InvalidKeySpecException {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建一个DESKeySpec对象
DESKeySpec dks = new DESKeySpec(rawKeyData);
// 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(dks);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance("DES");
// 用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, key, sr);
// 现在，获取数据并加密
// byte data[] = str.getBytes();
// 正式执行加密操作
byte[] encryptedData = cipher.doFinal(data);
// System.out.println("加密后===>" + encryptedData);
return encryptedData;
}
/**
* 解密方法
*
* @param rawKeyData
* @param encryptedData
* @return byte[]
* @throws IllegalBlockSizeException
* @throws BadPaddingException
* @throws InvalidKeyException
* @throws NoSuchAlgorithmException
* @throws NoSuchPaddingException
* @throws InvalidKeySpecException
*/
public static byte[] desDecrypt(byte rawKeyData[], byte[] encryptedData)
throws IllegalBlockSizeException, BadPaddingException,
InvalidKeyException, NoSuchAlgorithmException,
NoSuchPaddingException, InvalidKeySpecException {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建一个DESKeySpec对象
DESKeySpec dks = new DESKeySpec(rawKeyData);
// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance("DES");
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, key, sr);
// 正式执行解密操作
byte decryptedData[] = cipher.doFinal(encryptedData);
// System.out.println("解密后===>" + new String(decryptedData));
return decryptedData;
}
public static void main(String[] args) throws NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException, InvalidKeySpecException, InvalidKeyException {
EntityHelper.print(sha256Encode(""));
EntityHelper.print(sha512Encode(""));
EntityHelper.print(md5Encode(""));
// 1.1 >>> 首先要创建一个密匙
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 为我们选择的DES算法生成一个KeyGenerator对象
KeyGenerator kg = KeyGenerator.getInstance("DES");
kg.init(sr);
// 生成密匙
SecretKey key = kg.generateKey();
// 获取密匙数据
byte rawKeyData[] = key.getEncoded();
// byte rawKeyData[] = "sucretsa".getBytes();
System.out.println("密匙长度===>" + rawKeyData.length);
System.out.println("密匙Base64===>" + Base64.encodeBytes(rawKeyData));
String str = "hi.baidu.com/beijingalana"; // 待加密数据
// 2.1 >>> 调用加密方法
byte[] encryptedData = desEncrypt(rawKeyData, str.getBytes());
encryptedData = desEncrypt(rawKeyData, encryptedData);
// 3.1 >>> 调用解密方法
byte[] decrypt = desDecrypt(rawKeyData, encryptedData);
decrypt = desDecrypt(rawKeyData, decrypt);
System.out.println("解密===>" + new String(decrypt));
}
}