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/*
* Copyright 2018 New Vector 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.util.Log;
import java.util.Arrays;
public class OlmPkEncryption {
private static final String LOG_TAG = "OlmPkEncryption";
/** Session Id returned by JNI.
* This value uniquely identifies the native session instance.
**/
private transient long mNativeId;
public OlmPkEncryption() throws OlmException {
try {
mNativeId = createNewPkEncryptionJni();
} catch (Exception e) {
throw new OlmException(OlmException.EXCEPTION_CODE_PK_ENCRYPTION_CREATION, e.getMessage());
}
}
private native long createNewPkEncryptionJni();
private native void releasePkEncryptionJni();
public void releaseEncryption() {
if (0 != mNativeId) {
releasePkEncryptionJni();
}
mNativeId = 0;
}
public boolean isReleased() {
return (0 == mNativeId);
}
public void setRecipientKey(String aKey) throws OlmException {
if (null == aKey) {
return;
}
try {
setRecipientKeyJni(aKey.getBytes("UTF-8"));
} catch (Exception e) {
Log.e(LOG_TAG, "## setRecipientKey(): failed " + e.getMessage());
throw new OlmException(OlmException.EXCEPTION_CODE_PK_ENCRYPTION_SET_RECIPIENT_KEY, e.getMessage());
}
}
private native void setRecipientKeyJni(byte[] aKey);
public OlmPkMessage encrypt(String aPlaintext) throws OlmException {
if (null == aPlaintext) {
return null;
}
OlmPkMessage encryptedMsgRetValue = new OlmPkMessage();
try {
byte[] plaintextBuffer = aPlaintext.getBytes("UTF-8");
byte[] ciphertextBuffer = encryptJni(plaintextBuffer, encryptedMsgRetValue);
Arrays.fill(plaintextBuffer, (byte) 0);
if (null != ciphertextBuffer) {
encryptedMsgRetValue.mCipherText = new String(ciphertextBuffer, "UTF-8");
}
} catch (Exception e) {
Log.e(LOG_TAG, "## pkEncrypt(): failed " + e.getMessage());
throw new OlmException(OlmException.EXCEPTION_CODE_PK_ENCRYPTION_ENCRYPT, e.getMessage());
}
return encryptedMsgRetValue;
}
private native byte[] encryptJni(byte[] plaintext, OlmPkMessage aMessage);
}
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