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68 lines
1.8 KiB
68 lines
1.8 KiB
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package hash
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import (
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"encoding/hex"
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"strings"
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"code.gitea.io/gitea/modules/log"
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"golang.org/x/crypto/scrypt"
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)
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func init() {
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Register("scrypt", NewScryptHasher)
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}
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// ScryptHasher implements PasswordHasher
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// and uses the scrypt key derivation function.
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type ScryptHasher struct {
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n, r, p, keyLen int
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}
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// HashWithSaltBytes a provided password and salt
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func (hasher *ScryptHasher) HashWithSaltBytes(password string, salt []byte) string {
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if hasher == nil {
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return ""
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}
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hashedPassword, _ := scrypt.Key([]byte(password), salt, hasher.n, hasher.r, hasher.p, hasher.keyLen)
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return hex.EncodeToString(hashedPassword)
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}
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// NewScryptHasher is a factory method to create an ScryptHasher
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// The provided config should be either empty or of the form:
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// "<n>$<r>$<p>$<keyLen>", where <x> is the string representation
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// of an integer
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func NewScryptHasher(config string) *ScryptHasher {
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// This matches the original configuration for `scrypt` prior to storing hash parameters
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// in the database.
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// THESE VALUES MUST NOT BE CHANGED OR BACKWARDS COMPATIBILITY WILL BREAK
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hasher := &ScryptHasher{
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n: 1 << 16,
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r: 16,
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p: 2, // 2 passes through memory - this default config will use 128MiB in total.
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keyLen: 50,
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}
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if config == "" {
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return hasher
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}
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vals := strings.SplitN(config, "$", 4)
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if len(vals) != 4 {
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log.Error("invalid scrypt hash spec %s", config)
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return nil
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}
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var err error
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hasher.n, err = parseIntParam(vals[0], "n", "scrypt", config, nil)
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hasher.r, err = parseIntParam(vals[1], "r", "scrypt", config, err)
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hasher.p, err = parseIntParam(vals[2], "p", "scrypt", config, err)
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hasher.keyLen, err = parseIntParam(vals[3], "keyLen", "scrypt", config, err)
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if err != nil {
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return nil
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}
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return hasher
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}
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