Have you read http://www.eskimo.com/~weidai/cgi-bin/fom.cgi?file=79? If
you have, post the code you wrote using Crypto++, and explain what problem
you are having beyond just "without success", and I'll try to help.
On Sun, Oct 24, 2004 at 10:55:16AM +0800, Peter Chiu wrote:
> dear all:
>
> i'm new to the list and crypto++. i am trying to write a simple
> crypto++ program that decrypts an aes encrypted string returned from a
> web server by php's mcrypt. i've put in several hours already without
> success. please help!
>
> --
> Best,
> Peter
>
> =========== output of the mcrypt script =================
> IV: b9MUxwBQMcTSFTKD194qbaoBfJh/NjhhZ04PuwfBL2o=
> KEY: a7bc27daf59679de9db7b68b1ef92785
> ENCRYPTED: yZXVQ7xT2ejGekyxv+Z8EvQYvXYZ7aJ6JPUP
> This is very important data
>
> =============== here's the PHP mcrypt script: ===============
> <?php
> /* Open the cipher */
> $td = mcrypt_module_open('rijndael-256', '', 'ofb', '');
>
> /* Create the IV and determine the keysize length, used MCRYPT_RAND
> * on Windows instead */
> $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_RANDOM);
> echo "IV: " . base64_encode($iv) . "<br>";
> $ks = mcrypt_enc_get_key_size($td);
>
> /* Create key */
> $key = substr(md5('very secret key'), 0, $ks);
> echo "KEY: " . $key . "<br>";
>
> /* Intialize encryption */
> mcrypt_generic_init($td, $key, $iv);
>
> /* Encrypt data */
> $encrypted = mcrypt_generic($td, 'This is very important data');
> echo "ENCRYPTED: " . base64_encode ($encrypted) . "<br>";
>
> /* Terminate encryption handler */
> mcrypt_generic_deinit($td);
>
> /* Initialize encryption module for decryption */
> mcrypt_generic_init($td, $key, $iv);
>
> /* Decrypt encrypted string */
> $decrypted = mdecrypt_generic($td, $encrypted);
>
> /* Terminate decryption handle and close module */
> mcrypt_generic_deinit($td);
> mcrypt_module_close($td);
>
> /* Show string */
> echo trim($decrypted) . "\n";
> ?>
>
>
> --
> Best,
> Peter
