生成16位iv向量,使用该iv以及密钥加密原文

将加密后的真实密文与iv拼接: iv+真实密文

将与iv拼接后的密文用SHA-512 HMAC生成摘要信息(128位),与密文拼接: HMAC+base64后的密文,得到最终的密文

分离出hmac与密文,可以自行进行摘要检测,可以防止时序攻击.

得到拼接了iv的原文.分离出iv以及真实原文

使用密钥以及iv进行解码,得到原文

加密举例 php版本

/*****加密过程*****/

$str = "Hello World";

//1.使用16位密钥

$key = '12345678901234ab';

//2.生成16位iv 算法自定,示例中直接指定

//$iv = openssl_random_pseudo_bytes(16); //12345678ss1234ab

$iv="12345678ss1234ab";

//3.加密      IvdA7oP8BInWa5shY+LCyQ==

$secert_str = openssl_encrypt($str, 'AES-128-CBC', $key, 0, $iv);

$secert_str = $iv . $secert_str;        //4.将iv与密文拼接    12345678ss1234abIvdA7oP8BInWa5shY+LCyQ==

//5.base64_encode   考虑语言兼容性问题,该步骤取消

//6.用SHA-512生成摘要 128位16进制   3b2106c05b46b603969c2b1bc7503c8233d209dcd204b098b33ba704507315480e03e499e0082e8842b60baa01f522d7c0342d75196d18d3514d37c58e31d733

$hmac = hash_hmac('sha512', $secert_str, $key, false);

//7.拼接摘要,得到密文

$secert_str = $hmac . $secert_str;

return urlencode($secert_str);

$str=rawurldecode($str);

$len = mb_strlen($secert_str);

$ori_hmac = substr($secert_str, 0, 128);

$data = substr($secert_str, 128, $len);

//2.验证摘要

$local_hmac = hash_hmac('sha512', $data, $key, false);

$diff = 0;

for ($i = 0; $i < 128; $i++) {

$diff |= ord($ori_hmac[$i]) ^ ord($local_hmac[$i]);

if ($diff !== 0) {

return FALSE;

//3.分离iv

$len = mb_strlen($data);

$iv = substr($data, 0, 16);

$data = substr($data, 16, $len);

//4.解密,获得原文

$data = openssl_decrypt($data, 'AES-128-CBC', $key, 0, $iv);

java加解密类

package main;

import javax.crypto.Cipher;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

import javax.crypto.Mac;

import org.apache.commons.codec.binary.Base64;

import org.bouncycastle.util.encoders.Hex;

public class AESUtil {

* aes/128/cbc加密

* @param sSrc  明文

* @param sKey  密钥

* @param sIv   向量

* @return

* @throws Exception

public static String Encrypt(String sSrc, String sKey, String sIv) throws Exception {

if (sKey == null) {

System.out.print("Key为空null");

return null;

// 判断Key是否为16位

if (sKey.length() != 16) {

System.out.print("Key长度不是16位");

return null;

//1.加密

byte[] raw = sKey.getBytes();

SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");//aes-cbc-pkcs5(pkcs5与pkcs7通用)

IvParameterSpec iv = new IvParameterSpec(sIv.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度

cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

byte[] encrypted = cipher.doFinal(sSrc.getBytes("UTF-8"));

String encryptedString = new String(Base64.encodeBase64(encrypted));

//2.拼接iv

encryptedString = sIv + encryptedString;

//3.sha512

String hmac = encodeHmacSHA512(encryptedString, sKey);

//4.拼接摘要

encryptedString = hmac+encryptedString;

//5.urlencode

encryptedString = URLEncoder.encode(encryptedString);

return encryptedString;

// 解密

* @param sSrc  密文

* @param sKey  密钥

* @return

* @throws Exception

public static String Decrypt(String sSrc, String sKey) throws Exception {

//0.urldecode

sSrc=URLDecoder.decode(sSrc);

//1.分离摘要

System.out.println(sSrc);

String hmac=sSrc.substring(0,128);

String data=sSrc.substring(128,sSrc.length());

//2.验证摘要

//3.分离iv

String sIv=data.substring(0,16);

String str=data.substring(16,data.length());

//4.解密

byte[] raw = sKey.getBytes("UTF-8");

SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

IvParameterSpec iv = new IvParameterSpec(sIv.getBytes());

cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

byte[] encrypted1 = Base64.decodeBase64(str.getBytes());

try {

byte[] original = cipher.doFinal(encrypted1);

String originalString = new String(original);

return originalString;

} catch (Exception e) {

System.out.println(e.toString());

return null;

}catch (Exception ex){

System.out.println(ex.toString());

return null;

* HmacSHA512消息摘要

* @param data 待做摘要处理的数据

* @param key  密钥

* @return

public static String encodeHmacSHA512(String data, String key) throws Exception {

byte[] bytesKey = key.getBytes();

SecretKeySpec secretKey = new SecretKeySpec(bytesKey, "HmacSHA512");

Mac mac = Mac.getInstance(secretKey.getAlgorithm());

mac.init(secretKey);

final byte[] macData = mac.doFinal(data.getBytes());

byte[] hex = new Hex().encode(macData);

String result = new String(hex, "ISO-8859-1");

return result;

java实例

import main.AESUtil;

public class Main {

public static void main(String[] args) {

//key

String cKey = "12345678901234ab";

// 需要加密的字串

String cSrc = "Hello World";

//iv 16位  算法自定 实例中直接指定

String sIv = "12345678ss1234ab";

String enString;

String deString;

try {

enString = AESUtil.Encrypt(cSrc, cKey, sIv);

System.out.println("加密后的字串是：" + enString);

deString = AESUtil.Decrypt("3b2106c05b46b603969c2b1bc7503c8233d209dcd204b098b33ba704507315480e03e499e0082e8842b60baa01f522d7c0342d75196d18d3514d37c58e31d73312345678ss1234abIvdA7oP8BInWa5shY+LCyQ==", cKey);

System.out.println("解密后的字串是：" + deString);

} catch (Exception e) {

e.printStackTrace();

文章目录 目的：主要是后面实验过程中，会经常使用这串代码，这里记录便于以后使用查找。 import matplotlib.pyplot as plt print (plt.style.available) ''' ['bmh', 'classic', 'dark_background', 'fast', 'fivethirtyeight', 'ggplot', 'grayscale',  转载于：http://blog.csdn.net/niuniu20008/article/details/2953785 本文在转载了别人文章的基础上又加上了自己的理解。 总结：只有引用类型可以改变原数据，值引用不会改变原来的数据。数组若传递的是引用则会改变原来数组中的值，若传递的是单个值则是值传递，不会改变原来数组的值 与其他语言不同，J