/**
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* Copyright (c) 2005-2012 springside.org.cn
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*/
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package com.jeeplus.common.security;
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import java.io.UnsupportedEncodingException;
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import java.security.GeneralSecurityException;
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import java.security.SecureRandom;
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import java.util.Arrays;
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import javax.crypto.Cipher;
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import javax.crypto.KeyGenerator;
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import javax.crypto.Mac;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import com.jeeplus.common.utils.Encodes;
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import com.jeeplus.common.utils.Exceptions;
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/**
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* 支持HMAC-SHA1消息签名 及 DES/AES对称加密的工具类.
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*
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* 支持Hex与Base64两种编码方式.
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*
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* @author calvin
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*/
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public class Cryptos {
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private static final String AES = "AES";
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private static final String AES_CBC = "AES/CBC/PKCS5Padding";
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private static final String HMACSHA1 = "HmacSHA1";
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private static final String DEFAULT_URL_ENCODING = "UTF-8";
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private static final int DEFAULT_HMACSHA1_KEYSIZE = 160; //RFC2401
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private static final int DEFAULT_AES_KEYSIZE = 128;
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private static final int DEFAULT_IVSIZE = 16;
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private static final byte[] DEFAULT_KEY = new byte[]{-97,88,-94,9,70,-76,126,25,0,3,-20,113,108,28,69,125};
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private static SecureRandom random = new SecureRandom();
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//-- HMAC-SHA1 funciton --//
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/**
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* 使用HMAC-SHA1进行消息签名, 返回字节数组,长度为20字节.
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*
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* @param input 原始输入字符数组
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* @param key HMAC-SHA1密钥
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*/
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public static byte[] hmacSha1(byte[] input, byte[] key) {
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try {
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SecretKey secretKey = new SecretKeySpec(key, HMACSHA1);
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Mac mac = Mac.getInstance(HMACSHA1);
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mac.init(secretKey);
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return mac.doFinal(input);
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} catch (GeneralSecurityException e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* 校验HMAC-SHA1签名是否正确.
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*
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* @param expected 已存在的签名
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* @param input 原始输入字符串
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* @param key 密钥
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*/
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public static boolean isMacValid(byte[] expected, byte[] input, byte[] key) {
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byte[] actual = hmacSha1(input, key);
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return Arrays.equals(expected, actual);
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}
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/**
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* 生成HMAC-SHA1密钥,返回字节数组,长度为160位(20字节).
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* HMAC-SHA1算法对密钥无特殊要求, RFC2401建议最少长度为160位(20字节).
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*/
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public static byte[] generateHmacSha1Key() {
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try {
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KeyGenerator keyGenerator = KeyGenerator.getInstance(HMACSHA1);
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keyGenerator.init(DEFAULT_HMACSHA1_KEYSIZE);
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SecretKey secretKey = keyGenerator.generateKey();
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return secretKey.getEncoded();
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} catch (GeneralSecurityException e) {
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throw Exceptions.unchecked(e);
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}
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}
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//-- AES funciton --//
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/**
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* 使用AES加密原始字符串.
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*
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* @param input 原始输入字符数组
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*/
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public static String aesEncrypt(String input) {
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try {
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return Encodes.encodeHex(aesEncrypt(input.getBytes(DEFAULT_URL_ENCODING), DEFAULT_KEY));
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} catch (UnsupportedEncodingException e) {
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return "";
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}
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}
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/**
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* 使用AES加密原始字符串.
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*
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* @param input 原始输入字符数组
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* @param key 符合AES要求的密钥
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*/
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public static String aesEncrypt(String input, String key) {
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try {
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return Encodes.encodeHex(aesEncrypt(input.getBytes(DEFAULT_URL_ENCODING), Encodes.decodeHex(key)));
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} catch (UnsupportedEncodingException e) {
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return "";
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}
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}
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/**
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* 使用AES加密原始字符串.
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*
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* @param input 原始输入字符数组
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* @param key 符合AES要求的密钥
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*/
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public static byte[] aesEncrypt(byte[] input, byte[] key) {
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return aes(input, key, Cipher.ENCRYPT_MODE);
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}
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/**
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* 使用AES加密原始字符串.
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*
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* @param input 原始输入字符数组
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* @param key 符合AES要求的密钥
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* @param iv 初始向量
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*/
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public static byte[] aesEncrypt(byte[] input, byte[] key, byte[] iv) {
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return aes(input, key, iv, Cipher.ENCRYPT_MODE);
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}
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/**
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* 使用AES解密字符串, 返回原始字符串.
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*
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* @param input Hex编码的加密字符串
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*/
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public static String aesDecrypt(String input) {
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try {
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return new String(aesDecrypt(Encodes.decodeHex(input), DEFAULT_KEY), DEFAULT_URL_ENCODING);
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} catch (UnsupportedEncodingException e) {
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return "";
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}
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}
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/**
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* 使用AES解密字符串, 返回原始字符串.
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*
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* @param input Hex编码的加密字符串
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* @param key 符合AES要求的密钥
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*/
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public static String aesDecrypt(String input, String key) {
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try {
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return new String(aesDecrypt(Encodes.decodeHex(input), Encodes.decodeHex(key)), DEFAULT_URL_ENCODING);
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} catch (UnsupportedEncodingException e) {
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return "";
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}
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}
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/**
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* 使用AES解密字符串, 返回原始字符串.
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*
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* @param input Hex编码的加密字符串
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* @param key 符合AES要求的密钥
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*/
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public static byte[] aesDecrypt(byte[] input, byte[] key) {
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return aes(input, key, Cipher.DECRYPT_MODE);
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}
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/**
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* 使用AES解密字符串, 返回原始字符串.
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*
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* @param input Hex编码的加密字符串
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* @param key 符合AES要求的密钥
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* @param iv 初始向量
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*/
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public static byte[] aesDecrypt(byte[] input, byte[] key, byte[] iv) {
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return aes(input, key, iv, Cipher.DECRYPT_MODE);
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}
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/**
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* 使用AES加密或解密无编码的原始字节数组, 返回无编码的字节数组结果.
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*
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* @param input 原始字节数组
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* @param key 符合AES要求的密钥
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* @param mode Cipher.ENCRYPT_MODE 或 Cipher.DECRYPT_MODE
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*/
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private static byte[] aes(byte[] input, byte[] key, int mode) {
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try {
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SecretKey secretKey = new SecretKeySpec(key, AES);
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Cipher cipher = Cipher.getInstance(AES);
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cipher.init(mode, secretKey);
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return cipher.doFinal(input);
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} catch (GeneralSecurityException e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* 使用AES加密或解密无编码的原始字节数组, 返回无编码的字节数组结果.
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*
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* @param input 原始字节数组
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* @param key 符合AES要求的密钥
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* @param iv 初始向量
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* @param mode Cipher.ENCRYPT_MODE 或 Cipher.DECRYPT_MODE
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*/
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private static byte[] aes(byte[] input, byte[] key, byte[] iv, int mode) {
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try {
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SecretKey secretKey = new SecretKeySpec(key, AES);
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IvParameterSpec ivSpec = new IvParameterSpec(iv);
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Cipher cipher = Cipher.getInstance(AES_CBC);
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cipher.init(mode, secretKey, ivSpec);
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return cipher.doFinal(input);
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} catch (GeneralSecurityException e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* 生成AES密钥,返回字节数组, 默认长度为128位(16字节).
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*/
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public static String generateAesKeyString() {
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return Encodes.encodeHex(generateAesKey(DEFAULT_AES_KEYSIZE));
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}
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/**
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* 生成AES密钥,返回字节数组, 默认长度为128位(16字节).
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*/
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public static byte[] generateAesKey() {
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return generateAesKey(DEFAULT_AES_KEYSIZE);
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}
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/**
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* 生成AES密钥,可选长度为128,192,256位.
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*/
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public static byte[] generateAesKey(int keysize) {
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try {
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KeyGenerator keyGenerator = KeyGenerator.getInstance(AES);
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keyGenerator.init(keysize);
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SecretKey secretKey = keyGenerator.generateKey();
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return secretKey.getEncoded();
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} catch (GeneralSecurityException e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* 生成随机向量,默认大小为cipher.getBlockSize(), 16字节.
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*/
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public static byte[] generateIV() {
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byte[] bytes = new byte[DEFAULT_IVSIZE];
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random.nextBytes(bytes);
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return bytes;
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}
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}
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