http://laokaddk.blog.51cto.com/368606/461279/
关于对称加密中的反馈模式:
http://blog.csdn.net/aaaaatiger/article/details/2525561
:写法为:
DES/CBC/PKCS5Padding
各种加密算法的加密解密写法:已有DES,MD5,SHA(未结束)
package com.qin.test;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.math.BigInteger;import java.security.InvalidKeyException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.security.spec.InvalidKeySpecException;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;public class Main { public static void main(String[] args) throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException, IOException { Main m = new Main(); // m.desJie(m.desJia()); // m.createMD5Code(); m.createSHACode(); } /********************************************************************************* * 对称DES加密解密 DES(Data Encryption Standard)是发明最早的最广泛使用的分组对称加密算法。 * DES算法的入口参数有三个 * :Key、Data、Mode。其中Key为8个字节共64位,是DES算法的工作密钥;Data也为8个字节64位,是要被加密或被解密的数据; * Mode为DES的工作方式,有两种:加密或解密。 */ private String desKey = "12345678";// des加密key必须为8位长度 public byte[] desJia() throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException { // 因为普通的Random是线性可预测的,安全性不高,而这个安全性比较高 SecureRandom s = new SecureRandom(); // 创建Deskey对象 DESKeySpec DESKey = new DESKeySpec(desKey.getBytes()); // 创建DES密钥工厂 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); // 使用密钥工厂来生成符合规范的密钥对象 SecretKey secretKey = keyFactory.generateSecret(DESKey); // 进行实际的加密 Cipher c = Cipher.getInstance("DES/ECB/PKCS5Padding"); // 初始化 c.init(Cipher.ENCRYPT_MODE, secretKey, s); // 开始加密 byte[] b = c.doFinal("我是加密的内容".getBytes()); for (byte bb : b) { System.out.println("" + bb); } return b; } public void desJie(byte[] neirong) throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException { // 因为普通的Random是线性可预测的,安全性不高,而这个安全性比较高 SecureRandom s = new SecureRandom(); // 创建Deskey对象 DESKeySpec DESKey = new DESKeySpec(desKey.getBytes()); // 创建DES密钥工厂 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); // 使用密钥工厂来生成符合规范的密钥对象 SecretKey secretKey = keyFactory.generateSecret(DESKey); // 进行实际的解密 Cipher c = Cipher.getInstance("DES/ECB/PKCS5Padding"); // 初始化 c.init(Cipher.DECRYPT_MODE, secretKey, s); // 开始解密 byte[] hehe = c.doFinal(neirong); System.out.println(new String(hehe)); } /********************************************************************************************* * MD5消息摘要算法 MD5的典型应用是对一段Message(字节串)产生fingerprint(指纹),以防止被“篡改”。 * 相同的内容会产生相同的md5值 * */ public void createMD5Code() throws NoSuchAlgorithmException, IOException { MessageDigest md5 = MessageDigest.getInstance("MD5"); File f = new File("D:\\bb.txt");// 验教文件的md5值 FileInputStream fileInputStream = new FileInputStream(f); byte[] bytes = new byte[256]; int len = -1; while ((len = fileInputStream.read(bytes)) > -1) { md5.update(bytes, 0, len); } fileInputStream.close(); byte[] md5Code = md5.digest(); System.out.println("我的" + f.getName() + " md5 :" + new BigInteger(1, md5Code).toString(16)); } /** * SHA类似MD5,不过产生的长度比md5长 */ public void createSHACode() throws NoSuchAlgorithmException, IOException { MessageDigest md5 = MessageDigest.getInstance("SHA"); File f = new File("D:\\bb.txt");// 验教文件的SHA值 FileInputStream fileInputStream = new FileInputStream(f); byte[] bytes = new byte[256]; int len = -1; while ((len = fileInputStream.read(bytes)) > -1) { md5.update(bytes, 0, len); } fileInputStream.close(); byte[] md5Code = md5.digest(); System.out.println("我的" + f.getName() + " SHA :" + new BigInteger(1, md5Code).toString(16)); }}
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