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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Password.Pbkdf2 do
@moduledoc """
This module implements Pbkdf2 passwords in terms of Plug.Crypto.
"""
alias Plug.Crypto.KeyGenerator
def decode64(str) do
str
|> String.replace(".", "+")
|> Base.decode64!(padding: false)
end
def encode64(bin) do
bin
|> Base.encode64(padding: false)
|> String.replace("+", ".")
end
def verify_pass(password, hash) do
["pbkdf2-" <> digest, iterations, salt, hash] = String.split(hash, "$", trim: true)
salt = decode64(salt)
iterations = String.to_integer(iterations)
digest = String.to_atom(digest)
binary_hash =
KeyGenerator.generate(password, salt, digest: digest, iterations: iterations, length: 64)
encode64(binary_hash) == hash
end
def hash_pwd_salt(password, opts \\ []) do
salt =
Keyword.get_lazy(opts, :salt, fn ->
:crypto.strong_rand_bytes(16)
end)
digest = Keyword.get(opts, :digest, :sha512)
iterations =
Keyword.get(opts, :iterations, Pleroma.Config.get([:password, :iterations], 160_000))
binary_hash =
KeyGenerator.generate(password, salt, digest: digest, iterations: iterations, length: 64)
"$pbkdf2-#{digest}$#{iterations}$#{encode64(salt)}$#{encode64(binary_hash)}"
end
end
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