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/*
* Copyright 2019 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 OlmPkSigning {
private static final String LOG_TAG = "OlmPkSigning";
/** PK Signing Id returned by JNI.
* This value uniquely identifies the native PK signing instance.
**/
private transient long mNativeId;
public OlmPkSigning() throws OlmException {
try {
mNativeId = createNewPkSigningJni();
} catch (Exception e) {
throw new OlmException(OlmException.EXCEPTION_CODE_PK_SIGNING_CREATION, e.getMessage());
}
}
private native long createNewPkSigningJni();
private native void releasePkSigningJni();
public void releaseSigning() {
if (0 != mNativeId) {
releasePkSigningJni();
}
mNativeId = 0;
}
public boolean isReleased() {
return (0 == mNativeId);
}
public static native int seedLength();
public static byte[] generateSeed() throws OlmException {
try {
return generateSeedJni();
} catch (Exception e) {
Log.e(LOG_TAG, "## generateSeed(): failed " + e.getMessage());
throw new OlmException(OlmException.EXCEPTION_CODE_PK_SIGNING_GENERATE_SEED, e.getMessage());
}
}
public static native byte[] generateSeedJni();
public String initWithSeed(byte[] seed) throws OlmException {
try {
byte[] pubKey = setKeyFromSeedJni(seed);
return new String(pubKey, "UTF-8");
} catch (Exception e) {
Log.e(LOG_TAG, "## initWithSeed(): failed " + e.getMessage());
throw new OlmException(OlmException.EXCEPTION_CODE_PK_SIGNING_INIT_WITH_SEED, e.getMessage());
}
}
public native byte[] setKeyFromSeedJni(byte[] seed);
public String sign(String aMessage) throws OlmException {
if (null == aMessage) {
return null;
}
byte[] messageBuffer = null;
try {
messageBuffer = aMessage.getBytes("UTF-8");
byte[] signature = pkSignJni(messageBuffer);
return new String(signature, "UTF-8");
} catch (Exception e) {
Log.e(LOG_TAG, "## pkSign(): failed " + e.getMessage());
throw new OlmException(OlmException.EXCEPTION_CODE_PK_SIGNING_SIGN, e.getMessage());
} finally {
if (null != messageBuffer) {
Arrays.fill(messageBuffer, (byte) 0);
}
}
}
private native byte[] pkSignJni(byte[] message);
}
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