Demonstrate a bug with AES CFB 128 for certain key sizes introduced
with the Erlang 19.0 release. The code in the block_crypt_nif function
in the crypto.c source file incorrectly calls aes_cfb_8_crypt when the
specified cipher is aes_cfb8 or aes_cfb128 and the key size is 24 or
32. The aes_cfb_8_crypt function calls the AES_cfb8_encrypt function
from the openssl interface, but this is incorrect when the cipher is
aes_cfb128.
Unfortunately the test cases in the crypto test suite are insufficient
to detect an issue like this because it exercises the encryption and
decryption roundtrip using the same incorrect underlying function. The
problem was observed when trying to update an application to Erlang 19
that attempted to decrypt data that was encrypted using aes_cfb128 by
another source. In this commit I altered the crypto test suite to
provide a demonstration of this problem.