PHP、Java des加密解密实例
《PHP实战:PHP、Java des加密解密实例》要点: des加密是对称加密中在互联网应用的比拟多的一种加密方式,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PHP实例 上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 $crypttext . "n";//加密后的内容? ? echo mcrypt_decrypt(MCRYPT_RIJNDAEL_256,base64_decode($crypttext),$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,好比使用的是MCRYPT_RIJNDAEL_128,那么用这个算法加密时秘钥长度就是128bit的,好比 $key = 'fjjda0&9^$$#+*%$fada',是20个字符,那在实际加密的时候只用到前16个字符加密(16*8=128),不足128bit的php中会用' '来补齐.PHP实例 有的时候做项目对接的时候,可能你用的是Php加密的,而对方用的是java写的,对接的过程中就发现机加密后的内容对方解密不了,这是因为Php跟java在实现这个算法的时候有差别,要想正确加密解密必要两边都做下处理:PHP实例 PHP:
代码如下:
<必修php? class Security {? ??? public static function encrypt($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,'','');? ??????? $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td),MCRYPT_RAND);? ??????? mcrypt_generic_init($td,$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,-$padding);? ??????? return $decrypted;? ??? }???? }? ?? ?? ?? $key = "1234567891234567";? $data = "example";? ?? $value = Security::encrypt($data,$key );? echo $value.'<br/>';? echo Security::decrypt($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));? ????????? ????????????? ??? }???? }? 《PHP实战:PHP、Java des加密解密实例》是否对您有启发,欢迎查看更多与《PHP实战:PHP、Java des加密解密实例》相关教程,学精学透。编程之家 52php.cn为您提供精彩教程。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |