javades加密文件

Ⅰ DES加密算法 java实现

c语言的源代码，供参考：

http://hi..com/gaojinshan/blog/item/8b2710c4ece4b3ce39db49e9.html

Ⅱ des解密算法，利用C语言解密JAVA语言加密的密码。。密钥为12345678，加密后的密文为：26d086be3a3a62fc

// C 语言 DES用的是 ECB模式， 没有填充
// 因此Java端要对应， 你的明文是 liubiao
吗？
// 另外 DES已经不安全了， 如果可以改为 3DES或者 AES吧。
public class LearnDes {

public static void main(String[] args) {
try {
System.out.println(encrypt("liubiao", "12345678"));

System.out.println(decrypt("26d086be3a3a62fc", "12345678"));
} catch (Exception e) {
e.printStackTrace();
}
}
public static String encrypt(String message, String key) throws Exception {
//Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
Cipher cipher = Cipher.getInstance("DES/ECB/NOPADDING");

DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
//cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
cipher.init(Cipher.ENCRYPT_MODE, secretKey );

return toHexString(cipher.doFinal(message.getBytes("UTF-8")));
}

public static String decrypt(String message, String key) throws Exception {

byte[] bytesrc = convertHexString(message);

//Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
Cipher cipher = Cipher.getInstance("DES/ECB/NOPADDING");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

//cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
cipher.init(Cipher.DECRYPT_MODE, secretKey );

byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte);
}

public static byte[] convertHexString(String ss) {
byte digest[] = new byte[ss.length() / 2];
for (int i = 0; i < digest.length; i++) {
String byteString = ss.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(byteString, 16);
digest[i] = (byte) byteValue;
}

return digest;
}
public static String toHexString(byte b[]) {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < b.length; i++) {
String plainText = Integer.toHexString(0xff & b[i]);
if (plainText.length() < 2)
plainText = "0" + plainText;
hexString.append(plainText);
}

return hexString.toString();
}
}

Ⅲ 用java实现des加密和解密

一个用DES来加密、解密的类
http://www.javanb.com/java/1/17816.html

import java.security.*;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

/**
* 字符串工具集合
* @author Liudong
*/
public class StringUtils {

private static final String PASSWORD_CRYPT_KEY = "__jDlog_";
private final static String DES = "DES";

/**
* 加密
* @param src 数据源
* @param key 密钥，长度必须是8的倍数
* @return 返回加密后的数据
* @throws Exception
*/
public static byte[] encrypt(byte[] src, byte[] key)throws Exception {
//DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec转换成
// 一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
// 现在，获取数据并加密
// 正式执行加密操作
return cipher.doFinal(src);
}

/**
* 解密
* @param src 数据源
* @param key 密钥，长度必须是8的倍数
* @return 返回解密后的原始数据
* @throws Exception
*/
public static byte[] decrypt(byte[] src, byte[] key)throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建一个DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成
// 一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
// 现在，获取数据并解密
// 正式执行解密操作
return cipher.doFinal(src);
}
/**
* 密码解密
* @param data
* @return
* @throws Exception
*/
public final static String decrypt(String data){
try {
return new String(decrypt(hex2byte(data.getBytes()),
PASSWORD_CRYPT_KEY.getBytes()));
}catch(Exception e) {
}
return null;
}
/**
* 密码加密
* @param password
* @return
* @throws Exception
*/
public final static String encrypt(String password){
try {
return byte2hex(encrypt(password.getBytes(),PASSWORD_CRYPT_KEY.getBytes())); }catch(Exception e) {
}
return null;
}

比较长, 转了一部分.

Ⅳ Java中 DES加密算法

三个文件：
一：skey_DES.java
//对称秘钥生成及对象化保存
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

public class Skey_DES
{
public static void main(String args[])throws Exception
{
KeyGenerator kg=KeyGenerator.getInstance("DESede");
kg.init(168);
SecretKey k=kg.generateKey();
FileOutputStream f=new FileOutputStream("key1.txt");
ObjectOutputStream b= new ObjectOutputStream(f);
b.writeObject(k);
}
};

二：SEnc.java
//对称秘钥加密，使用字节码
import java.io.*;
import java.security.*;
import javax.crypto.*;

public class SEnc
{
public static void main(String args[]) throws Exception
{
String s="";

FileInputStream f=new FileInputStream("key1.txt");
ObjectInputStream b=new ObjectInputStream(f);
Key k=(Key)b.readObject();
Cipher cp=Cipher.getInstance("DESede");
cp.init(Cipher.ENCRYPT_MODE,k);

byte ptext[]=s.getBytes("UTF8");
for(int i=0;i<ptext.length;i++)
{
System.out.print(ptext[i]+",");
}
System.out.println("");
byte ctext[]=cp.doFinal(ptext);
for(int i=0;i<ctext.length;i++)
{
System.out.print(ctext[i]+",");
}
FileOutputStream f2=new FileOutputStream("SEnc.txt");
f2.write(ctext);
}
};
三：SDec.java
//使用对称秘钥解密
import java.io.*;
import java.security.*;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class SDec
{
public static void main(String args[])throws Exception
{
FileInputStream f=new FileInputStream("SEnc.txt");
int num=f.available();
byte[] ctext=new byte[num];
f.read(ctext);

FileInputStream f2=new FileInputStream("key1.txt");
ObjectInputStream b=new ObjectInputStream(f2);
Key k=(Key)b.readObject();
Cipher cp=Cipher.getInstance("DESede");
cp.init(Cipher.DECRYPT_MODE,k);

byte[] ptext=cp.doFinal(ctext);
String p=new String(ptext,"UTF8");
System.out.println(p);
}
};