AESUtil

package com.pajk.synhisdgszyy.utils;

import com.alibaba.common.lang.StringUtil; import org.apache.commons.codec.binary.Base64; import org.apache.commons.lang3.StringUtils;

import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.spec.SecretKeySpec; import java.math.BigInteger; import java.security.MessageDigest; import java.security.SecureRandom;

public class AESUtil {

/**
 * 将byte[]转为各种进制的字符串
 * 
 * @param bytes
 *            byte[]
 * @param radix
 *            可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制
 * @return 转换后的字符串
 */
public static String binary(byte[] bytes, int radix) {
	return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
}

/**
 * base 64 encode
 * 
 * @param bytes
 *            待编码的byte[]
 * @return 编码后的base 64 code
 */
public static String base64Encode(byte[] bytes) {
	return new Base64().encodeToString(bytes);
}

/**
 * base 64 decode
 * 
 * @param base64Code
 *            待解码的base 64 code
 * @return 解码后的byte[]
 * @throws Exception
 */
public static byte[] base64Decode(String base64Code) throws Exception {
	return StringUtils.isEmpty(base64Code) ? null : new Base64().decode(base64Code);
}

/**
 * 获取byte[]的md5值
 * 
 * @param bytes
 *            byte[]
 * @return md5
 * @throws Exception
 */
public static byte[] md5(byte[] bytes) throws Exception {
	MessageDigest md = MessageDigest.getInstance("MD5");
	md.update(bytes);

	return md.digest();
}

/**
 * 获取字符串md5值
 * 
 * @param msg
 * @return md5
 * @throws Exception
 */
public static byte[] md5(String msg) throws Exception {
	return StringUtil.isEmpty(msg) ? null : md5(msg.getBytes());
}

/**
 * 结合base64实现md5加密
 * 
 * @param msg
 *            待加密字符串
 * @return 获取md5后转为base64
 * @throws Exception
 */
public static String md5Encrypt(String msg) throws Exception {
	return StringUtil.isEmpty(msg) ? null : base64Encode(md5(msg));
}

/**
 * AES加密
 * 
 * @param content
 *            待加密的内容
 * @param encryptKey
 *            加密密钥
 * @return 加密后的byte[]
 * @throws Exception
 */
public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
	KeyGenerator kgen = KeyGenerator.getInstance("AES");
	SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
	random.setSeed(encryptKey.getBytes());
	kgen.init(128, random);

// kgen.init(128, new SecureRandom(encryptKey.getBytes()));

	Cipher cipher = Cipher.getInstance("AES");
	cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));

	return cipher.doFinal(content.getBytes("utf-8"));
}

/**
 * AES加密为base 64 code
 * 
 * @param content
 *            待加密的内容
 * @param encryptKey
 *            加密密钥
 * @return 加密后的base 64 code
 * @throws Exception
 */
public static String aesEncrypt(String content, String encryptKey) throws Exception {
	return base64Encode(aesEncryptToBytes(content, encryptKey));
}

/**
 * AES解密
 * 
 * @param encryptBytes
 *            待解密的byte[]
 * @param decryptKey
 *            解密密钥
 * @return 解密后的String
 * @throws Exception
 */
public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
	KeyGenerator kgen = KeyGenerator.getInstance("AES");
	SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
	random.setSeed(decryptKey.getBytes());
	kgen.init(128, random);

// kgen.init(128, new SecureRandom(decryptKey.getBytes()));

	Cipher cipher = Cipher.getInstance("AES");
	cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
	byte[] decryptBytes = cipher.doFinal(encryptBytes);

	return new String(decryptBytes);
}

/**
 * 将base 64 code AES解密
 * 
 * @param encryptStr
 *            待解密的base 64 code
 * @param decryptKey
 *            解密密钥
 * @return 解密后的string
 * @throws Exception
 */
public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
	return StringUtil.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
}

public static void main(String[] args) throws Exception {
	String key = md5Encrypt("test2");
	String tt = CryptUtil.encrypt("123456", "test2"+key);
	String t1 = CryptUtil.decrypt(tt, "test2"+key);
	System.out.println(tt);
	System.out.println(t1);
}

}