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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package hash
import (
"crypto/sha256"
"encoding/hex"
"strings"
"code.gitea.io/gitea/modules/log"
"golang.org/x/crypto/pbkdf2"
)
func init() {
MustRegister("pbkdf2", NewPBKDF2Hasher)
}
// PBKDF2Hasher implements PasswordHasher
// and uses the PBKDF2 key derivation function.
type PBKDF2Hasher struct {
iter, keyLen int
}
// HashWithSaltBytes a provided password and salt
func (hasher *PBKDF2Hasher) HashWithSaltBytes(password string, salt []byte) string {
if hasher == nil {
return ""
}
return hex.EncodeToString(pbkdf2.Key([]byte(password), salt, hasher.iter, hasher.keyLen, sha256.New))
}
// NewPBKDF2Hasher is a factory method to create an PBKDF2Hasher
// config should be either empty or of the form:
// "<iter>$<keyLen>", where <x> is the string representation
// of an integer
func NewPBKDF2Hasher(config string) *PBKDF2Hasher {
// This default configuration uses the following parameters:
// iter=10000, keyLen=50.
// This matches the original configuration for `pbkdf2` prior to storing parameters
// in the database.
// THESE VALUES MUST NOT BE CHANGED OR BACKWARDS COMPATIBILITY WILL BREAK
hasher := &PBKDF2Hasher{
iter: 10_000,
keyLen: 50,
}
if config == "" {
return hasher
}
vals := strings.SplitN(config, "$", 2)
if len(vals) != 2 {
log.Error("invalid pbkdf2 hash spec %s", config)
return nil
}
var err error
hasher.iter, err = parseIntParam(vals[0], "iter", "pbkdf2", config, nil)
hasher.keyLen, err = parseIntParam(vals[1], "keyLen", "pbkdf2", config, err)
if err != nil {
return nil
}
return hasher
}
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