Re: F30 Self-Contained Change proposal: libcrypt.so.1 (compatibility library for POSIX): Let encrypt, encrypt_r, setkey, setkey_r, and fcrypt return ENOSYS instead of performing any real operation

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* Simo Sorce:

> On Tue, 2019-01-15 at 10:39 +0100, Florian Weimer wrote:
>> * Ben Cotton:
>> 
>> > Remove real functionality from encrypt, encrypt_r, setkey, setkey_r,
>> > and fcrypt from the libxcrypt.so.1 compatibility library and let those
>> > functions set "errno" to "ENOSYS" when invoked.
>> 
>> encrypt rewrites its argument in place, so this will leave the argument
>> unencrypted.  This does not seem a good idea, even if it's just DES.
>
> Maybe encrypt with AES and return an error anyway ?

It's still only got a 56-bit key.  AES would only make dictionary
attacks easier because there are more efficient AES implementations than
DES implementations.

Maybe the stub implementation should just overwrite the argument with
zeros.

Thanks,
Florian
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