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mautrix-signal/pkg/libsignalgo/username.go

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// mautrix-signal - A Matrix-signal puppeting bridge.
// Copyright (C) 2026 Tulir Asokan
//
// 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 libsignalgo
/*
#include "./libsignal-ffi.h"
*/
import "C"
import (
"runtime"
)
type UsernameHash = fixedArray32
func DecryptUsernameLink(entropy, encryptedUsername []byte) (string, error) {
var username C.SignalCStringPtr
signalFfiError := C.signal_username_link_decrypt_username(&username, BytesToBuffer(entropy), BytesToBuffer(encryptedUsername))
runtime.KeepAlive(entropy)
runtime.KeepAlive(encryptedUsername)
if signalFfiError != nil {
return "", wrapError(signalFfiError)
}
return CopyCStringToString(username), nil
}
func HashUsername(username string) (UsernameHash, error) {
cUsername, free := GoStringToCString(username)
defer free()
var result UsernameHash
signalFfiError := C.signal_username_hash(result.cFixedArray(), cUsername)
if signalFfiError != nil {
return UsernameHash{}, wrapError(signalFfiError)
}
return result, nil
}