PHP AES Algorithm

PHP AES Algorithm 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 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"; ?> Copy Code

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