From ccbb9606b725b8f1d7eeccf14c358b146aeee491 Mon Sep 17 00:00:00 2001 From: ylecollen Date: Tue, 10 Jan 2017 16:06:21 +0100 Subject: Move the android project from /Java/Android/OlmLibSdk --- .../org/matrix/olm/OlmInboundGroupSession.java | 260 +++++++++++++++++++++ 1 file changed, 260 insertions(+) create mode 100644 android/olm-sdk/src/main/java/org/matrix/olm/OlmInboundGroupSession.java (limited to 'android/olm-sdk/src/main/java/org/matrix/olm/OlmInboundGroupSession.java') diff --git a/android/olm-sdk/src/main/java/org/matrix/olm/OlmInboundGroupSession.java b/android/olm-sdk/src/main/java/org/matrix/olm/OlmInboundGroupSession.java new file mode 100644 index 0000000..571bddb --- /dev/null +++ b/android/olm-sdk/src/main/java/org/matrix/olm/OlmInboundGroupSession.java @@ -0,0 +1,260 @@ +/* + * Copyright 2017 OpenMarket Ltd + * Copyright 2017 Vector Creations Ltd + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.matrix.olm; + +import android.text.TextUtils; +import android.util.Log; + +import java.io.IOException; +import java.io.ObjectInputStream; +import java.io.ObjectOutputStream; +import java.io.Serializable; + +/** + * Class used to create an inbound Megolm session.
+ * Counter part of the outbound group session {@link OlmOutboundGroupSession}, this class decrypts the messages sent by the outbound side. + * + *

Detailed implementation guide is available at Implementing End-to-End Encryption in Matrix clients. + */ +public class OlmInboundGroupSession extends CommonSerializeUtils implements Serializable { + private static final long serialVersionUID = -772028491251653253L; + private static final String LOG_TAG = "OlmInboundGroupSession"; + + /** Session Id returned by JNI.
+ * This value uniquely identifies the native inbound group session instance. + */ + private transient long mNativeId; + + /** + * Result in {@link #decryptMessage(String)} + */ + public static class DecryptMessageResult { + /** decrypt message **/ + public String mDecryptedMessage; + + /** decrypt index **/ + public long mIndex; + } + + /** + * Constructor.
+ * Create and save a new native session instance ID and start a new inbound group session. + * The session key parameter is retrieved from an outbound group session. + * @param aSessionKey session key + * @throws OlmException constructor failure + */ + public OlmInboundGroupSession(String aSessionKey) throws OlmException { + if (TextUtils.isEmpty(aSessionKey)) { + Log.e(LOG_TAG, "## initInboundGroupSession(): invalid session key"); + throw new OlmException(OlmException.EXCEPTION_CODE_INIT_INBOUND_GROUP_SESSION, "invalid session key"); + } else { + try { + mNativeId = createNewSessionJni(aSessionKey.getBytes("UTF-8")); + } catch (Exception e) { + throw new OlmException(OlmException.EXCEPTION_CODE_INIT_INBOUND_GROUP_SESSION, e.getMessage()); + } + } + } + + /** + * Initialize a new inbound group session and return it to JAVA side.
+ * Since a C prt is returned as a jlong, special care will be taken + * to make the cast (OlmInboundGroupSession* to jlong) platform independent. + * @param aSessionKeyBuffer session key from an outbound session + * @return the initialized OlmInboundGroupSession* instance or throw an exception it fails. + **/ + private native long createNewSessionJni(byte[] aSessionKeyBuffer); + + /** + * Release native session and invalid its JAVA reference counter part.
+ * Public API for {@link #releaseSessionJni()}. + */ + public void releaseSession(){ + if (0 != mNativeId) { + releaseSessionJni(); + } + mNativeId = 0; + } + + /** + * Destroy the corresponding OLM inbound group session native object.
+ * This method must ALWAYS be called when this JAVA instance + * is destroyed (ie. garbage collected) to prevent memory leak in native side. + * See {@link #createNewSessionJni(byte[])}. + */ + private native void releaseSessionJni(); + + /** + * Return true the object resources have been released.
+ * @return true the object resources have been released + */ + public boolean isReleased() { + return (0 == mNativeId); + } + + /** + * Retrieve the base64-encoded identifier for this inbound group session. + * @return the session ID + * @throws OlmException the failure reason + */ + public String sessionIdentifier() throws OlmException { + try { + return new String(sessionIdentifierJni(), "UTF-8"); + } catch (Exception e) { + Log.e(LOG_TAG, "## sessionIdentifier() failed " + e.getMessage()); + throw new OlmException(OlmException.EXCEPTION_CODE_INBOUND_GROUP_SESSION_IDENTIFIER, e.getMessage()); + } + } + + /** + * Get a base64-encoded identifier for this inbound group session. + * An exception is thrown if the operation fails. + * @return the base64-encoded identifier + */ + private native byte[] sessionIdentifierJni(); + + /** + * Decrypt the message passed in parameter.
+ * In case of error, null is returned and an error message description is provided in aErrorMsg. + * @param aEncryptedMsg the message to be decrypted + * @return the decrypted message information + * @exception OlmException teh failure reason + */ + public DecryptMessageResult decryptMessage(String aEncryptedMsg) throws OlmException { + DecryptMessageResult result = new DecryptMessageResult(); + + try { + byte[] decryptedMessageBuffer = decryptMessageJni(aEncryptedMsg.getBytes("UTF-8"), result); + + if (null != decryptedMessageBuffer) { + result.mDecryptedMessage = new String(decryptedMessageBuffer, "UTF-8"); + } + } catch (Exception e) { + Log.e(LOG_TAG, "## decryptMessage() failed " + e.getMessage()); + throw new OlmException(OlmException.EXCEPTION_CODE_INBOUND_GROUP_SESSION_DECRYPT_SESSION, e.getMessage()); + } + + return result; + } + + /** + * Decrypt a message. + * An exception is thrown if the operation fails. + * @param aEncryptedMsg the encrypted message + * @param aDecryptMessageResult the decryptMessage informaton + * @return the decrypted message + */ + private native byte[] decryptMessageJni(byte[] aEncryptedMsg, DecryptMessageResult aDecryptMessageResult); + + //============================================================================================================== + // Serialization management + //============================================================================================================== + + /** + * Kick off the serialization mechanism. + * @param aOutStream output stream for serializing + * @throws IOException exception + */ + private void writeObject(ObjectOutputStream aOutStream) throws IOException { + serialize(aOutStream); + } + + /** + * Kick off the deserialization mechanism. + * @param aInStream input stream + * @throws Exception exception + */ + private void readObject(ObjectInputStream aInStream) throws Exception { + deserialize(aInStream); + } + + /** + * Return the current inbound group session as a bytes buffer.
+ * The session is serialized and encrypted with aKey. + * In case of failure, an error human readable + * description is provide in aErrorMsg. + * @param aKey encryption key + * @param aErrorMsg error message description + * @return pickled bytes buffer if operation succeed, null otherwise + */ + @Override + protected byte[] serialize(byte[] aKey, StringBuffer aErrorMsg) { + byte[] pickleRetValue = null; + + // sanity check + if(null == aErrorMsg) { + Log.e(LOG_TAG,"## serialize(): invalid parameter - aErrorMsg=null"); + aErrorMsg.append("aErrorMsg=null"); + } else if (null == aKey) { + aErrorMsg.append("Invalid input parameters in serialize()"); + } else { + aErrorMsg.setLength(0); + try { + pickleRetValue = serializeJni(aKey); + } catch (Exception e) { + Log.e(LOG_TAG, "## serialize() failed " + e.getMessage()); + aErrorMsg.append(e.getMessage()); + } + } + + return pickleRetValue; + } + /** + * JNI counter part of {@link #serialize(byte[], StringBuffer)}. + * @param aKey encryption key + * @return the serialized session + */ + private native byte[] serializeJni(byte[] aKey); + + /** + * Loads an account from a pickled base64 string.
+ * See {@link #serialize(byte[], StringBuffer)} + * @param aSerializedData pickled account in a bytes buffer + * @param aKey key used to encrypted + */ + @Override + protected void deserialize(byte[] aSerializedData, byte[] aKey) throws Exception { + String errorMsg = null; + + try { + if ((null == aSerializedData) || (null == aKey)) { + Log.e(LOG_TAG, "## deserialize(): invalid input parameters"); + errorMsg = "invalid input parameters"; + } else { + mNativeId = deserializeJni(aSerializedData, aKey); + } + } catch (Exception e) { + Log.e(LOG_TAG, "## deserialize() failed " + e.getMessage()); + errorMsg = e.getMessage(); + } + + if (!TextUtils.isEmpty(errorMsg)) { + releaseSession(); + throw new OlmException(OlmException.EXCEPTION_CODE_ACCOUNT_DESERIALIZATION, errorMsg); + } + } + + /** + * Allocate a new session and initialize it with the serialisation data.
+ * An exception is thrown if the operation fails. + * @param aSerializedData the session serialisation buffer + * @param aKey the key used to encrypt the serialized account data + * @return the deserialized session + **/ + private native long deserializeJni(byte[] aSerializedData, byte[] aKey); +} -- cgit v1.2.3