79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
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// Copyright 2023 wanderer <a_mirre at utb dot cz>
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// SPDX-License-Identifier: AGPL-3.0-only
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package password
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import (
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"time"
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"github.com/matthewhartstonge/argon2"
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"golang.org/x/exp/rand"
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)
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var (
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// argon provides the package with current config. the one currently set on
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// init is the memory-hard argon2.RecommendedConfig().
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argon argon2.Config
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// r stores a seeded *rand.Rand so that the generated salts are more close
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// to non-deterministic.
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r = rand.New(rand.NewSource(uint64(time.Now().UnixNano())))
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)
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// Argon accepts a password string and returns hash and salt byte slices, or an
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// error.
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func Argon(password string) (*argon2.Raw, error) {
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salt := make([]byte, argon.SaltLength)
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err := genSalt(salt)
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if err != nil {
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return nil, err
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}
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hash, err := argon.Hash([]byte(password), salt)
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if err != nil {
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return nil, err
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}
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return &hash, nil
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}
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// ArgonDecode attempts to decode the given byte slice into an argon raw
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// struct.
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func ArgonDecode(digest []byte) (*argon2.Raw, error) {
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hash, err := argon2.Decode(digest)
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if err != nil {
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return nil, err
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}
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return &hash, nil
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}
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// ArgonVerify checks that the provided password matches the one used to create
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// the provided digest, returns a bool and an error.
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func ArgonVerify(password string, digest []byte) (bool, error) {
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return argon2.VerifyEncoded([]byte(password), digest)
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}
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// genSalt fills slice b with len(b) random bytes.
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func genSalt(b []byte) error {
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_, err := r.Read(b)
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if err != nil {
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return err
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}
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return nil
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}
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func init() {
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// TODO: hide this behind a config flag someday.
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noop := false
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if noop {
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// 64MiB peak memory usage.
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argon = argon2.DefaultConfig()
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} else {
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// 2GiB peak memory usage.
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argon = argon2.RecommendedDefaults()
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}
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}
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