现在项目开发基本上都离不开密码加密,鉴权签名等。本篇笔记主要记录项目开发中常用的加密方法AES、SHA1、MD5在Java语言中的实现。
- package com.luo.util;
- import java.io.UnsupportedEncodingException;
- import java.security.InvalidKeyException;
- import java.security.MessageDigest;
- 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 DecriptUtil {
- /**
- * AES加密
- * @parameter: str:待加密字符串,secretKeyBase:用于生成密钥的基础字符串
- * @return: 加密字节数组
- **/
- public static byte[] encryptAES(String str, String secretKeyBase) {
- try {
- KeyGenerator kgen = KeyGenerator.getInstance("AES");
- kgen.init(128, new SecureRandom(secretKeyBase.getBytes()));
- SecretKey secretKey = kgen.generateKey();
- byte[] enCodeFormat = secretKey.getEncoded();
- SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
- Cipher cipher = Cipher.getInstance("AES");// 创建密码器
- byte[] byteContent = str.getBytes("UTF-8");
- cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
- byte[] result = cipher.doFinal(byteContent);
- return result; // 加密
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- } catch (NoSuchPaddingException e) {
- e.printStackTrace();
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- } catch (UnsupportedEncodingException e) {
- e.printStackTrace();
- } catch (IllegalBlockSizeException e) {
- e.printStackTrace();
- } catch (BadPaddingException e) {
- e.printStackTrace();
- }
- return null;
- }
- /**
- * AES解密
- * @parameter: strByteArray:待解密字节数组,
- * @parameter: secretKeyBase:用于生成密钥的基础字符串, 需要注意的是EAS是对称加密,所以secretKeyBase在加密解密时要一样的
- * @return: 解密后字符串
- **/
- public static String decryptAES(byte[] strByteArray, String secretKeyBase) {
- try {
- KeyGenerator kgen = KeyGenerator.getInstance("AES");
- kgen.init(128, new SecureRandom(secretKeyBase.getBytes()));
- SecretKey secretKey = kgen.generateKey();
- byte[] enCodeFormat = secretKey.getEncoded();
- SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
- Cipher cipher = Cipher.getInstance("AES");// 创建密码器
- cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
- String result = new String(cipher.doFinal(strByteArray),"UTF-8");
- return result; // 加密
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- } catch (NoSuchPaddingException e) {
- e.printStackTrace();
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- } catch (IllegalBlockSizeException e) {
- e.printStackTrace();
- } catch (BadPaddingException e) {
- e.printStackTrace();
- } catch (UnsupportedEncodingException e) {
- e.printStackTrace();
- }
- return null;
- }
- /**
- * SHA、SHA1加密
- * @parameter: str:待加密字符串
- * @return: 加密串
- **/
- public static String SHA1(String str) {
- try {
- MessageDigest digest = java.security.MessageDigest
- .getInstance("SHA-1"); //如果是SHA加密只需要将"SHA-1"改成"SHA"即可
- digest.update(str.getBytes());
- byte messageDigest[] = digest.digest();
- // Create Hex String
- StringBuffer hexStr = new StringBuffer();
- // 字节数组转换为 十六进制 数
- for (int i = 0; i < messageDigest.length; i++) {
- String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
- if (shaHex.length() < 2) {
- hexStr.append(0);
- }
- hexStr.append(shaHex);
- }
- return hexStr.toString();
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- }
- return null;
- }
- /**
- * MD5加密
- * @parameter: str:待加密字符串
- * @return: 加密串
- **/
- public static String MD5(String str) {
- try {
- // 获得MD5摘要算法的 MessageDigest 对象
- MessageDigest mdInst = MessageDigest.getInstance("MD5");
- // 使用指定的字节更新摘要
- mdInst.update(str.getBytes());
- // 获得密文
- byte[] md = mdInst.digest();
- // 把密文转换成十六进制的字符串形式
- StringBuffer hexString = new StringBuffer();
- // 字节数组转换为 十六进制 数
- for (int i = 0; i < md.length; i++) {
- String shaHex = Integer.toHexString(md[i] & 0xFF);
- if (shaHex.length() < 2) {
- hexString.append(0);
- }
- hexString.append(shaHex);
- }
- return hexString.toString();
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- }
- return null;
- }
- }
上述代码可以直接当作类库在项目中进行调用。