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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/argon2"
)
func init() {
MustRegister("argon2", NewArgon2Hasher)
}
// Argon2Hasher implements PasswordHasher
// and uses the Argon2 key derivation function, hybrant variant
type Argon2Hasher struct {
time uint32
memory uint32
threads uint8
keyLen uint32
}
// HashWithSaltBytes a provided password and salt
func (hasher *Argon2Hasher) HashWithSaltBytes(password string, salt []byte) string {
if hasher == nil {
return ""
}
return hex.EncodeToString(argon2.IDKey([]byte(password), salt, hasher.time, hasher.memory, hasher.threads, hasher.keyLen))
}
// NewArgon2Hasher is a factory method to create an Argon2Hasher
// The provided config should be either empty or of the form:
// "<time>$<memory>$<threads>$<keyLen>", where <x> is the string representation
// of an integer
func NewArgon2Hasher(config string) *Argon2Hasher {
// This default configuration uses the following parameters:
// time=2, memory=64*1024, threads=8, keyLen=50.
// It will make two passes through the memory, using 64MiB in total.
// This matches the original configuration for `argon2` prior to storing hash parameters
// in the database.
// THESE VALUES MUST NOT BE CHANGED OR BACKWARDS COMPATIBILITY WILL BREAK
hasher := &Argon2Hasher{
time: 2,
memory: 1 << 16,
threads: 8,
keyLen: 50,
}
if config == "" {
return hasher
}
vals := strings.SplitN(config, "$", 4)
if len(vals) != 4 {
log.Error("invalid argon2 hash spec %s", config)
return nil
}
parsed, err := parseUIntParam(vals[0], "time", "argon2", config, nil)
hasher.time = uint32(parsed)
parsed, err = parseUIntParam(vals[1], "memory", "argon2", config, err)
hasher.memory = uint32(parsed)
parsed, err = parseUIntParam(vals[2], "threads", "argon2", config, err)
hasher.threads = uint8(parsed)
parsed, err = parseUIntParam(vals[3], "keyLen", "argon2", config, err)
hasher.keyLen = uint32(parsed)
if err != nil {
return nil
}
return hasher
}
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