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PHP、Java des加密解密实例

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Release: 2016-06-13 09:05:52
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PHP、Java des加密解密实例

   这篇文章主要介绍了PHP、Java 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,本文分别给出了PHP和JAVA版本的实现代码,需要的朋友可以参考下

  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

  下面是加密解密的实例

   代码如下:

  $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:

   代码如下:

  

  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.'
';

  echo Security::decrypt($value, $key );

  Java:

  代码如下:

  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));

  }

  }

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