PBKDF2: Allow empty passphrase.
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PBKDF2: Allow empty passphrase.

* cipher/kdf.c (gcry_kdf_derive): Allow empty passphrase for PBKDF2.
* tests/t-kdf.c (check_pbkdf2): Add test case for above.

While it is insecure, the PBKDF2 implementations usually
allows to derive key only from salt.

This particular case is used e.g. in cryptsetup when
you use empty file as keyfile for LUKS keyslot.

Test vector is compared with two independent implementations.

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gmazyland	Authored on Oct 29 2012, 5:18 PM
• werner	Committed on Nov 5 2012, 7:53 PM

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Werner Koch <wk@gnupg.org> committed rC542d354b902c: PBKDF2: Allow empty passphrase. (authored by Milan Broz <mbroz@redhat.com>).Nov 5 2012, 7:53 PM

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