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<?php $cipher_alg = MCRYPT_RIJNDAEL_128; $shared_key = "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"; $key = pack("H*", $shared_key); $init_vector = "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"; $iv = pack("H*", $init_vector); echo mcrypt_decrypt($cipher_alg, $key, mcrypt_encrypt( $cipher_alg, $key, 'This is a test', MCRYPT_MODE_CBC, $iv), MCRYPT_MODE_CBC, $iv);

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