Package argon2 implements the key derivation function Argon2. Argon2 was selected as the winner of the Password Hashing Competition and can be used to derive cryptographic keys from passwords. Argon2 is specfifed at https://github.com/P-H-C/phc-winner-argon2/blob/master/argon2-specs.pdf This package implements the three different Argon2 variants: