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password.go
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password.go
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// Copyright (C) 2022 CYBERCRYPT
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package crypto
import (
"crypto/subtle"
"encoding/base64"
"golang.org/x/crypto/pbkdf2"
"golang.org/x/crypto/sha3"
)
const passwordLength = 32
const saltLength = 8
const hashLength = 32
const iterationCount = 10000
// PasswordHasher implements PasswordHasherInterface using pbkdf2.
type PasswordHasher struct {
random RandomInterface
}
func NewPasswordHasher() *PasswordHasher {
return &PasswordHasher{&NativeRandom{}}
}
func (p *PasswordHasher) GeneratePassword() (string, []byte, error) {
passwordBytes, err := p.random.GetBytes(passwordLength)
if err != nil {
return "", nil, err
}
password := base64.RawURLEncoding.EncodeToString(passwordBytes)
salt, err := p.random.GetBytes(saltLength)
if err != nil {
return "", nil, err
}
hash := pbkdf2.Key([]byte(password), salt, iterationCount, hashLength, sha3.New256)
saltAndHash := append(salt, hash...)
return password, saltAndHash, nil
}
func (p *PasswordHasher) Compare(password string, saltAndHash []byte) bool {
salt := saltAndHash[:saltLength]
hash := saltAndHash[saltLength:]
return subtle.ConstantTimeCompare(passwordHash([]byte(password), salt), hash) == 1
}
func passwordHash(password, salt []byte) []byte {
return pbkdf2.Key(password, salt, iterationCount, hashLength, sha3.New256)
}