《PHP實戰：PHP、Java des加密解密實例》要點：
本文介紹了PHP實戰：PHP、Java des加密解密實例，希望對您有用。如果有疑問，可以聯系我們。
des加密是對稱加密中在互聯網應用的比擬多的一種加密方式,php 通過mcrypt擴展庫來支持des加密,要在Php中使用des加密,需要先安裝mcrypt擴展庫PHP實例
上面是加密解密的實例
PHP實例
代碼如下:
$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";//密鑰?
$text = "Meet me at 11 o'clock behind the monument.";//需要加密的內容?
echo ($text) . "\n";?
?
$crypttext =base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv));?
echo $crypttext . "\n";//加密后的內容?
?
echo mcrypt_decrypt(MCRYPT_RIJNDAEL_256,$key,base64_decode($crypttext),MCRYPT_MODE_ECB,$iv);//解密后的內容?
在AES加密算法中通常會用到MCRYPT_RIJNDAEL_128、MCRYPT_RIJNDAEL_192、MCRYPT_RIJNDAEL_256三種,后面的128、192、256代表的是秘鑰(也就是加密的Key)是多少bit的,好比使用的是MCRYPT_RIJNDAEL_128,那么用這個算法加密時秘鑰長度就是128bit的,好比 $key = 'fjjda0&9^$$#+*%$fada',是20個字符,那在實際加密的時候只用到前16個字符加密(16*8=128),不足128bit的php中會用'\0'來補齊.PHP實例
有的時候做項目對接的時候,可能你用的是Php加密的,而對方用的是java寫的,對接的過程中就發現機加密后的內容對方解密不了,這是因為Php跟java在實現這個算法的時候有差別,要想正確加密解密必要兩邊都做下處理：PHP實例
PHP:
PHP實例
代碼如下:
<必修php?
class Security {?
??? public static function encrypt($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, '', 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:
代碼如下:
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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