Php aes算法

<?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"; ?>

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