forked from GitHub-Mirror/riotX-android
101 lines
4.1 KiB
Kotlin
101 lines
4.1 KiB
Kotlin
/*
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* Copyright 2019 New Vector Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package im.vector.matrix.android.internal.crypto.actions
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import android.text.TextUtils
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import im.vector.matrix.android.api.auth.data.Credentials
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import im.vector.matrix.android.internal.crypto.MXCRYPTO_ALGORITHM_OLM
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import im.vector.matrix.android.internal.crypto.MXOlmDevice
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import im.vector.matrix.android.internal.crypto.model.MXDeviceInfo
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import im.vector.matrix.android.internal.crypto.model.rest.EncryptedMessage
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import im.vector.matrix.android.internal.di.MoshiProvider
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import im.vector.matrix.android.internal.session.SessionScope
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import im.vector.matrix.android.internal.util.convertToUTF8
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import timber.log.Timber
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import java.util.*
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import javax.inject.Inject
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internal class MessageEncrypter @Inject constructor(private val credentials: Credentials,
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private val olmDevice: MXOlmDevice) {
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/**
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* Encrypt an event payload for a list of devices.
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* This method must be called from the getCryptoHandler() thread.
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*
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* @param payloadFields fields to include in the encrypted payload.
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* @param deviceInfos list of device infos to encrypt for.
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* @return the content for an m.room.encrypted event.
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*/
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fun encryptMessage(payloadFields: Map<String, Any>, deviceInfos: List<MXDeviceInfo>): EncryptedMessage {
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val deviceInfoParticipantKey = HashMap<String, MXDeviceInfo>()
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val participantKeys = ArrayList<String>()
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for (di in deviceInfos) {
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participantKeys.add(di.identityKey()!!)
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deviceInfoParticipantKey[di.identityKey()!!] = di
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}
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val payloadJson = HashMap(payloadFields)
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payloadJson["sender"] = credentials.userId
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payloadJson["sender_device"] = credentials.deviceId
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// Include the Ed25519 key so that the recipient knows what
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// device this message came from.
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// We don't need to include the curve25519 key since the
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// recipient will already know this from the olm headers.
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// When combined with the device keys retrieved from the
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// homeserver signed by the ed25519 key this proves that
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// the curve25519 key and the ed25519 key are owned by
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// the same device.
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val keysMap = HashMap<String, String>()
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keysMap["ed25519"] = olmDevice.deviceEd25519Key!!
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payloadJson["keys"] = keysMap
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val ciphertext = HashMap<String, Any>()
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for (deviceKey in participantKeys) {
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val sessionId = olmDevice.getSessionId(deviceKey)
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if (!TextUtils.isEmpty(sessionId)) {
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Timber.v("Using sessionid $sessionId for device $deviceKey")
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val deviceInfo = deviceInfoParticipantKey[deviceKey]
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payloadJson["recipient"] = deviceInfo!!.userId
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val recipientsKeysMap = HashMap<String, String>()
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recipientsKeysMap["ed25519"] = deviceInfo.fingerprint()!!
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payloadJson["recipient_keys"] = recipientsKeysMap
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// FIXME We have to canonicalize the JSON
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//JsonUtility.canonicalize(JsonUtility.getGson(false).toJsonTree(payloadJson)).toString()
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val payloadString = convertToUTF8(MoshiProvider.getCanonicalJson(Map::class.java, payloadJson))
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ciphertext[deviceKey] = olmDevice.encryptMessage(deviceKey, sessionId!!, payloadString!!)!!
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}
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}
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val res = EncryptedMessage()
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res.algorithm = MXCRYPTO_ALGORITHM_OLM
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res.senderKey = olmDevice.deviceCurve25519Key
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res.cipherText = ciphertext
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return res
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}
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} |