Item14562: Add the Argon2 hashing algorithm

Minor feature, add Argon2 to the list of supported hash algorithms.

Encoding recognized by $argon2i$v=19$ The v= is the version, which is the Argon2 algorithm version "1.3" converted from hex to decimal. Note that this algorithm doesn't reveal the salt directly in the encoded password hash, so we have to change the password check code to call the argon2i_verify method instead of comparing the generated hash.

There are no debian/ubuntu packages for CPAN:Crypt::Argon2 yet. This will not be a default setting.

-- GeorgeClark - 08 Dec 2017

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