/*
* 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 org.json.JSONObject;
import java.security.SecureRandom;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Olm SDK helper class.
*/
public class OlmUtility {
private static final String LOG_TAG = "OlmUtility";
public static final int RANDOM_KEY_SIZE = 32;
/** Instance Id returned by JNI.
* This value uniquely identifies this utility instance.
**/
private long mNativeId;
public OlmUtility() throws OlmException {
initUtility();
}
/**
* Create a native utility instance.
* To be called before any other API call.
* @exception OlmException the exception
*/
private void initUtility() throws OlmException {
try {
mNativeId = createUtilityJni();
} catch (Exception e) {
throw new OlmException(OlmException.EXCEPTION_CODE_UTILITY_CREATION, e.getMessage());
}
}
private native long createUtilityJni();
/**
* Release native instance.
* Public API for {@link #releaseUtilityJni()}.
*/
public void releaseUtility() {
if (0 != mNativeId) {
releaseUtilityJni();
}
mNativeId = 0;
}
private native void releaseUtilityJni();
/**
* Verify an ed25519 signature.
* An exception is thrown if the operation fails.
* @param aSignature the base64-encoded message signature to be checked.
* @param aFingerprintKey the ed25519 key (fingerprint key)
* @param aMessage the signed message
* @exception OlmException the failure reason
*/
public void verifyEd25519Signature(String aSignature, String aFingerprintKey, String aMessage) throws OlmException {
String errorMessage;
try {
if (TextUtils.isEmpty(aSignature) || TextUtils.isEmpty(aFingerprintKey) || TextUtils.isEmpty(aMessage)) {
Log.e(LOG_TAG, "## verifyEd25519Signature(): invalid input parameters");
errorMessage = "JAVA sanity check failure - invalid input parameters";
} else {
errorMessage = verifyEd25519SignatureJni(aSignature.getBytes("UTF-8"), aFingerprintKey.getBytes("UTF-8"), aMessage.getBytes("UTF-8"));
}
} catch (Exception e) {
Log.e(LOG_TAG, "## verifyEd25519Signature(): failed " + e.getMessage());
errorMessage = e.getMessage();
}
if (!TextUtils.isEmpty(errorMessage)) {
throw new OlmException(OlmException.EXCEPTION_CODE_UTILITY_VERIFY_SIGNATURE, errorMessage);
}
}
/**
* Verify an ed25519 signature.
* Return a human readable error message in case of verification failure.
* @param aSignature the base64-encoded message signature to be checked.
* @param aFingerprintKey the ed25519 key
* @param aMessage the signed message
* @return null if validation succeed, the error message string if operation failed
*/
private native String verifyEd25519SignatureJni(byte[] aSignature, byte[] aFingerprintKey, byte[] aMessage);
/**
* Compute the hash(SHA-256) value of the string given in parameter(aMessageToHash).
* The hash value is the returned by the method.
* @param aMessageToHash message to be hashed
* @return hash value if operation succeed, null otherwise
*/
public String sha256(String aMessageToHash) {
String hashRetValue = null;
if (null != aMessageToHash) {
try {
hashRetValue = new String(sha256Jni(aMessageToHash.getBytes("UTF-8")), "UTF-8");
} catch (Exception e) {
Log.e(LOG_TAG, "## sha256(): failed " + e.getMessage());
}
}
return hashRetValue;
}
/**
* Compute the digest (SHA 256) for the message passed in parameter.
* The digest value is the function return value.
* An exception is thrown if the operation fails.
* @param aMessage the message
* @return digest of the message.
**/
private native byte[] sha256Jni(byte[] aMessage);
/**
* Helper method to compute a string based on random integers.
* @return bytes buffer containing randoms integer values
*/
public static byte[] getRandomKey() {
SecureRandom secureRandom = new SecureRandom();
byte[] buffer = new byte[RANDOM_KEY_SIZE];
secureRandom.nextBytes(buffer);
// the key is saved as string
// so avoid the UTF8 marker bytes
for(int i = 0; i < RANDOM_KEY_SIZE; i++) {
buffer[i] = (byte)(buffer[i] & 0x7F);
}
return buffer;
}
/**
* Return true the object resources have been released.
* @return true the object resources have been released
*/
public boolean isReleased() {
return (0 == mNativeId);
}
/**
* Build a string-string dictionary from a jsonObject.
* @param jsonObject the object to parse
* @return the map
*/
public static Map toStringMap(JSONObject jsonObject) {
if (null != jsonObject) {
HashMap map = new HashMap<>();
Iterator keysItr = jsonObject.keys();
while(keysItr.hasNext()) {
String key = keysItr.next();
try {
Object value = jsonObject.get(key);
if (value instanceof String) {
map.put(key, (String) value);
} else {
Log.e(LOG_TAG, "## toStringMap(): unexpected type " + value.getClass());
}
} catch (Exception e) {
Log.e(LOG_TAG, "## toStringMap(): failed " + e.getMessage());
}
}
return map;
}
return null;
}
/**
* Build a string-string dictionary of string dictionary from a jsonObject.
* @param jsonObject the object to parse
* @return the map
*/
public static Map> toStringMapMap(JSONObject jsonObject) {
if (null != jsonObject) {
HashMap> map = new HashMap<>();
Iterator keysItr = jsonObject.keys();
while(keysItr.hasNext()) {
String key = keysItr.next();
try {
Object value = jsonObject.get(key);
if (value instanceof JSONObject) {
map.put(key, toStringMap((JSONObject) value));
} else {
Log.e(LOG_TAG, "## toStringMapMap(): unexpected type " + value.getClass());
}
} catch (Exception e) {
Log.e(LOG_TAG, "## toStringMapMap(): failed " + e.getMessage());
}
}
return map;
}
return null;
}
}