Php aes算法

nics

　　<?php function aes128cbcEncrypt($key, $text) {   /* Open the cipher */  $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');   if (! $td) {   throw new GeneralSecurityException('Invalid mcrypt cipher, check your libmcrypt library and php-mcrypt extention');   }   // replaced MCRYPT_DEV_RANDOM with MCRYPT_RAND since windows doesn't have /dev/rand :)   srand((double)microtime() * 1000000);   $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);   /* Intialize encryption */  mcrypt_generic_init($td, $key, $iv);   /* Encrypt data */  $encrypted = mcrypt_generic($td, $text);   /* Terminate encryption handler */  mcrypt_generic_deinit($td);   /*  *  AES-128-CBC encryption.  The IV is returned as the first 16 bytes  * of the cipher text.  */  return $iv . $encrypted;   }  function aes128cbcDecrypt($key, $encrypted_text) {   /* Open the cipher */  $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');   if (is_callable('mb_substr')) {   $iv = mb_substr($encrypted_text, 0, Crypto_CIPHER_BLOCK_SIZE, 'latin1');   } else {   $iv = substr($encrypted_text, 0, Crypto_CIPHER_BLOCK_SIZE);   }   /* Initialize encryption module for decryption */  mcrypt_generic_init($td, $key, $iv);   /* Decrypt encrypted string */  if (is_callable('mb_substr')) {   $encrypted = mb_substr($encrypted_text, Crypto_CIPHER_BLOCK_SIZE, mb_strlen($encrypted_text, 'latin1'), 'latin1');   } else {   $encrypted = substr($encrypted_text, Crypto_CIPHER_BLOCK_SIZE);   }   $decrypted = mdecrypt_generic($td, $encrypted);   /* Terminate decryption handle and close module */  mcrypt_generic_deinit($td);   mcrypt_module_close($td);   /* Show string */  return trim($decrypted);   } define('Crypto_CIPHER_BLOCK_SIZE',16);$a= aes128cbcEncrypt('pass','this is text');echo base64_encode($a)."/r/n";$b= aes128cbcDecrypt('pass',$a);echo $b."/r/n";$c= aes128cbcDecrypt('pass',base64_decode(base64_encode($a)));echo $c."/r/n";?>