php des 加密解密实例

des加密是对称加密中在互联网应用的比较多的一种加密方式，php 通过mcrypt扩展库来支持des加密，要在Php中使用des加密，需要先安装mcrypt扩展库

 $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
 $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
 $key = "This is a very secret key";//密钥
 $text = "Meet me at 11 o'clock behind the monument.";//需要加密的内容
 echo ($text) . "\n";

 $crypttext =base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv));
 echo $crypttext . "\n";//加密后的内容

 echo mcrypt_decrypt(MCRYPT_RIJNDAEL_256,$key,base64_decode($crypttext),MCRYPT_MODE_ECB,$iv);//解密后的内容

在AES加密算法中通常会用到MCRYPT_RIJNDAEL_128、MCRYPT_RIJNDAEL_192、MCRYPT_RIJNDAEL_256三种，后面的128、192、256代表的是秘钥（也就是加密的Key）是多少bit的，比如使用的是MCRYPT_RIJNDAEL_128，那么用这个算法加密时秘钥长度就是128bit的，比如 $key = 'fjjda0&9^$$#+*%$fada'，是20个字符，那在实际加密的时候只用到前16个字符加密（16*8=128）,不足128bit的php中会用'\0'来补齐。

有的时候做项目对接的时候，可能你用的是Php加密的，而对方用的是java写的，对接的过程中就发现机加密后的内容对方解密不了，这是因为Php跟java在实现这个算法的时候有差别，要想正确加密解密需要两边都做下处理：

PHP:

 <?php
 class Security {
     public static function encrypt($input, $key) {
         $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
         $input = Security::pkcs5_pad($input, $size);
         $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
         $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
         mcrypt_generic_init($td, $key, $iv);
         $data = mcrypt_generic($td, $input);
         mcrypt_generic_deinit($td);
         mcrypt_module_close($td);
         $data = base64_encode($data);
         return $data;
     }

     private static function pkcs5_pad ($text, $blocksize) {
         $pad = $blocksize - (strlen($text) % $blocksize);
         return $text . str_repeat(chr($pad), $pad);
     }

     public static function decrypt($sStr, $sKey) {
         $decrypted= mcrypt_decrypt(
         MCRYPT_RIJNDAEL_128,
         $sKey,
         base64_decode($sStr),
         MCRYPT_MODE_ECB
     );

         $dec_s = strlen($decrypted);
         $padding = ord($decrypted[$dec_s-1]);
         $decrypted = substr($decrypted, 0, -$padding);
         return $decrypted;
     }
 }

 $key = "1234567891234567";
 $data = "example";

 $value = Security::encrypt($data , $key );
 echo $value.'<br/>';
 echo Security::decrypt($value, $key );

Java:

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

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

public class Security {
    public static String encrypt(String input, String key){
        byte[] crypted = null;
        try{
            SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, skey);
            crypted = cipher.doFinal(input.getBytes());
        }catch(Exception e){
        System.out.println(e.toString());
    }
    return new String(Base64.encodeBase64(crypted));
}

    public static String decrypt(String input, String key){
        byte[] output = null;
        try{
            SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skey);
            output = cipher.doFinal(Base64.decodeBase64(input));
            }catch(Exception e){
            System.out.println(e.toString());
        }
        return new String(output);
    }

    public static void main(String[] args) {
        String key = "1234567891234567";
        String data = "example";

        System.out.println(Security.encrypt(data, key));

        System.out.println(Security.decrypt(Security.encrypt(data, key), key));

    }
}