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<?php $key = 'abcdefghijklmnop'; $iv = '0123456789abcdef'; $encrypted = openssl_encrypt('a', 'aes-128-cbc', $key, OPENSSL_RAW_DATA, $iv); $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encrypted, MCRYPT_MODE_CBC, $iv); var_dump(bin2hex($decrypted));

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