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