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Milan Broz 09d14a0b6c Add Argon2 bundled library to crypto backend.

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>

2017-08-06 21:13:12 +02:00

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 This is 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/