Node / meshtastic / Meshtastic-Android / files / core / model / src / commonMain / kotlin / org / meshtastic / core / model / util / SfppHasher.kt

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T8b949e/*

* Copyright (c) 2026 Meshtastic LLC

*

* This program 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.

*

* 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 General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <https://www.gnu.org/licenses/>.

*/

Tff7b72package T7ee787org.meshtastic.core.model.util

Tff7b72import T7ee787okio.ByteString.Companion.toByteString

T8b949e/** Computes SFPP (Store-Forward-Plus-Plus) message hashes for deduplication. */

Tff7b72object T56d364SfppHasher Tb4b4b4{

Tff7b72private Tff7b72const Tff7b72val Te6edf3HASH_SIZE Tff7b72= T79c0ff1T79c0ff6

Tff7b72private Tff7b72const Tff7b72val Te6edf3INT_BYTES Tff7b72= T79c0ff4

Tff7b72private Tff7b72const Tff7b72val Te6edf3INT_COUNT Tff7b72= T79c0ff3

Tff7b72private Tff7b72const Tff7b72val Te6edf3SHIFT_8 Tff7b72= T79c0ff8

Tff7b72private Tff7b72const Tff7b72val Te6edf3SHIFT_16 Tff7b72= T79c0ff1T79c0ff6

Tff7b72private Tff7b72const Tff7b72val Te6edf3SHIFT_24 Tff7b72= T79c0ff2T79c0ff4

Tff7b72fun Td2a8ffcomputeMessageHashTb4b4b4(Te6edf3encryptedPayloadTb4b4b4: Te6edf3ByteArrayTb4b4b4, Te6edf3toTb4b4b4: Tffa657IntTb4b4b4, Te6edf3fromTb4b4b4: Tffa657IntTb4b4b4, Te6edf3idTb4b4b4: Tffa657IntTb4b4b4)Tb4b4b4: Te6edf3ByteArray Tb4b4b4{

Tff7b72val Te6edf3input Tff7b72= Te6edf3ByteArrayTb4b4b4(Te6edf3encryptedPayloadTb4b4b4.Te6edf3size Tff7b72+ Te6edf3INT_BYTES Tff7b72* Te6edf3INT_COUNTTb4b4b4)

Te6edf3encryptedPayloadTb4b4b4.Te6edf3copyIntoTb4b4b4(Te6edf3inputTb4b4b4)

Tff7b72var Te6edf3offset Tff7b72= Te6edf3encryptedPayloadTb4b4b4.Te6edf3size

Tff7b72for Tb4b4b4(Te6edf3value Tff7b72in Te6edf3intArrayOfTb4b4b4(Te6edf3toTb4b4b4, Te6edf3fromTb4b4b4, Te6edf3idTb4b4b4)Tb4b4b4) Tb4b4b4{

Te6edf3inputTff7b72[Te6edf3offsetTff7b72+Tff7b72+Tff7b72] Tff7b72= Te6edf3valueTb4b4b4.Te6edf3toByteTb4b4b4(Tb4b4b4)

Te6edf3inputTff7b72[Te6edf3offsetTff7b72+Tff7b72+Tff7b72] Tff7b72= Tb4b4b4(Te6edf3value Te6edf3shr Te6edf3SHIFT_8Tb4b4b4)Tb4b4b4.Te6edf3toByteTb4b4b4(Tb4b4b4)

Te6edf3inputTff7b72[Te6edf3offsetTff7b72+Tff7b72+Tff7b72] Tff7b72= Tb4b4b4(Te6edf3value Te6edf3shr Te6edf3SHIFT_16Tb4b4b4)Tb4b4b4.Te6edf3toByteTb4b4b4(Tb4b4b4)

Te6edf3inputTff7b72[Te6edf3offsetTff7b72+Tff7b72+Tff7b72] Tff7b72= Tb4b4b4(Te6edf3value Te6edf3shr Te6edf3SHIFT_24Tb4b4b4)Tb4b4b4.Te6edf3toByteTb4b4b4(Tb4b4b4)

Tb4b4b4}

Tff7b72return Te6edf3inputTb4b4b4.Te6edf3toByteStringTb4b4b4(Tb4b4b4)Tb4b4b4.Te6edf3sha256Tb4b4b4(Tb4b4b4)Tb4b4b4.Te6edf3toByteArrayTb4b4b4(Tb4b4b4)Tb4b4b4.Te6edf3copyOfTb4b4b4(Te6edf3HASH_SIZETb4b4b4)

Tb4b4b4}

Tb4b4b4}