For Argon2 native code (gcrypt, OpenSSL) a flag in debug output is printed.
If libargon is used, then [cryptsetup libargon2] is printed
(embedded code) or [external libargon2] for dynamic external library.
# Crypto backend (OpenSSL 3.0.11 19 Sep 2023 [default][legacy] [external libargon2])
or
# Crypto backend (OpenSSL 3.0.11 19 Sep 2023 [default][legacy] [cryptsetup libargon2])
Fixes: #851
The Argon2i/id is a password hashing function that
won Password Hashing Competiton.
It will be (optionally) used in LUKS2 for passworrd-based
key derivation.
We have to bundle code for now (similar PBKDF2 years ago)
because there is yet no usable implementation in common
crypto libraries.
(Once there is native implementation, cryptsetup
will switch to the crypto library version.)
For now, we use reference (not optimized but portable) implementation.
This patch contains bundled Argon2 algorithm library copied from
https://github.com/P-H-C/phc-winner-argon2
For more info see Password Hashing Competition site:
https://password-hashing.net/
and draft of RFC document
https://datatracker.ietf.org/doc/draft-irtf-cfrg-argon2/
Signed-off-by: Milan Broz <gmazyland@gmail.com>
