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passwords.go
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passwords.go
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// Copyright (c) 2022 Proton AG
//
// This file is part of Proton Mail Bridge.
//
// Proton Mail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Proton Mail Bridge 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
package pmapi
import (
"encoding/base64"
"github.com/ProtonMail/go-srp"
"github.com/pkg/errors"
)
// HashMailboxPassword expectects 128bit long salt encoded by standard base64.
func HashMailboxPassword(password []byte, salt string) ([]byte, error) {
if salt == "" {
return password, nil
}
decodedSalt, err := base64.StdEncoding.DecodeString(salt)
if err != nil {
return nil, errors.Wrap(err, "failed to decode salt")
}
hash, err := srp.MailboxPassword(password, decodedSalt)
if err != nil {
return nil, errors.Wrap(err, "failed to hash password")
}
return hash[len(hash)-31:], nil
}