PHP、Java des加密解密实例_php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

下面是加密解密的实例

<br />$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);  <br />$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);  <br />$key = "This is a very secret key";//密钥  <br />$text = "Meet me at 11 o'clock behind the monument.";//需要加密的内容  <br />echo ($text) . "\n";  <br />  <br />$crypttext =base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv));  <br />echo $crypttext . "\n";//加密后的内容  <br />  <br />echo mcrypt_decrypt(MCRYPT_RIJNDAEL_256,$key,base6<strong style="color:transparent">本文来源gaodai#ma#com搞@@代~&码*网/</strong><strong>搞gaodaima代码</strong>4_decode($crypttext),MCRYPT_MODE_ECB,$iv);//解密后的内容  <br />

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:

<br /><?php  <br />class Security {  <br />    public static function encrypt($input, $key) {  <br />        $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);  <br />        $input = Security::pkcs5_pad($input, $size);  <br />        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');  <br />        $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);  <br />        mcrypt_generic_init($td, $key, $iv);  <br />        $data = mcrypt_generic($td, $input);  <br />        mcrypt_generic_deinit($td);  <br />        mcrypt_module_close($td);  <br />        $data = base64_encode($data);  <br />        return $data;  <br />    }  <br />   <br />    private static function pkcs5_pad ($text, $blocksize) {  <br />        $pad = $blocksize - (strlen($text) % $blocksize);  <br />        return $text . str_repeat(chr($pad), $pad);  <br />    }  <br />   <br />    public static function decrypt($sStr, $sKey) {  <br />        $decrypted= mcrypt_decrypt(  <br />        MCRYPT_RIJNDAEL_128,  <br />        $sKey,  <br />        base64_decode($sStr),  <br />        MCRYPT_MODE_ECB  <br />    );  <br />   <br />        $dec_s = strlen($decrypted);  <br />        $padding = ord($decrypted[$dec_s-1]);  <br />        $decrypted = substr($decrypted, 0, -$padding);  <br />        return $decrypted;  <br />    }     <br />}  <br />   <br />   <br />   <br />$key = "1234567891234567";  <br />$data = "example";  <br />   <br />$value = Security::encrypt($data , $key );  <br />echo $value.'<br />';  <br />echo Security::decrypt($value, $key );  <br />

Java:

<br />import javax.crypto.Cipher;  <br />import javax.crypto.spec.SecretKeySpec;  <br />   <br />import org.apache.commons.codec.binary.Base64;  <br />   <br />public class Security {  <br />    public static String encrypt(String input, String key){  <br />        byte[] crypted = null;  <br />        try{  <br />            SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES");  <br />            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");  <br />            cipher.init(Cipher.ENCRYPT_MODE, skey);  <br />            crypted = cipher.doFinal(input.getBytes());  <br />        }catch(Exception e){  <br />        System.out.println(e.toString());  <br />    }  <br />    return new String(Base64.encodeBase64(crypted));  <br />}  <br />   <br />    public static String decrypt(String input, String key){  <br />        byte[] output = null;  <br />        try{  <br />            SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES");  <br />            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");  <br />            cipher.init(Cipher.DECRYPT_MODE, skey);  <br />            output = cipher.doFinal(Base64.decodeBase64(input));  <br />            }catch(Exception e){  <br />            System.out.println(e.toString());  <br />        }  <br />        return new String(output);  <br />    }  <br />   <br />    public static void main(String[] args) {  <br />        String key = "1234567891234567";  <br />        String data = "example";  <br />          <br />        System.out.println(Security.encrypt(data, key));  <br />          <br />        System.out.println(Security.decrypt(Security.encrypt(data, key), key));  <br />          <br />              <br />    }     <br />}  <br />

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