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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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 android.security;
import android.security.keymaster.KeyCharacteristics;
import android.security.keymaster.KeymasterDefs;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* @hide
*/
public abstract class KeymasterUtils {
private KeymasterUtils() {}
public static KeymasterException getKeymasterException(int keymasterErrorCode) {
switch (keymasterErrorCode) {
case KeymasterDefs.KM_ERROR_INVALID_AUTHORIZATION_TIMEOUT:
// The name of this parameter significantly differs between Keymaster and framework
// APIs. Use the framework wording to make life easier for developers.
return new KeymasterException(keymasterErrorCode,
"Invalid user authentication validity duration");
default:
return new KeymasterException(keymasterErrorCode,
KeymasterDefs.getErrorMessage(keymasterErrorCode));
}
}
public static CryptoOperationException getCryptoOperationException(KeymasterException e) {
switch (e.getErrorCode()) {
case KeymasterDefs.KM_ERROR_KEY_EXPIRED:
return new KeyExpiredException();
case KeymasterDefs.KM_ERROR_KEY_NOT_YET_VALID:
return new KeyNotYetValidException();
case KeymasterDefs.KM_ERROR_KEY_USER_NOT_AUTHENTICATED:
return new UserNotAuthenticatedException();
// TODO: Handle TBD Keymaster error code "invalid key: new fingerprint enrolled"
// case KeymasterDefs.KM_ERROR_TBD
// return new NewFingerprintEnrolledException();
default:
return new CryptoOperationException("Crypto operation failed", e);
}
}
public static CryptoOperationException getCryptoOperationException(int keymasterErrorCode) {
return getCryptoOperationException(getKeymasterException(keymasterErrorCode));
}
public static Integer getInt(KeyCharacteristics keyCharacteristics, int tag) {
if (keyCharacteristics.hwEnforced.containsTag(tag)) {
return keyCharacteristics.hwEnforced.getInt(tag, -1);
} else if (keyCharacteristics.swEnforced.containsTag(tag)) {
return keyCharacteristics.swEnforced.getInt(tag, -1);
} else {
return null;
}
}
public static List<Integer> getInts(KeyCharacteristics keyCharacteristics, int tag) {
List<Integer> result = new ArrayList<Integer>();
result.addAll(keyCharacteristics.hwEnforced.getInts(tag));
result.addAll(keyCharacteristics.swEnforced.getInts(tag));
return result;
}
public static Date getDate(KeyCharacteristics keyCharacteristics, int tag) {
Date result = keyCharacteristics.hwEnforced.getDate(tag, null);
if (result == null) {
result = keyCharacteristics.swEnforced.getDate(tag, null);
}
return result;
}
public static boolean getBoolean(KeyCharacteristics keyCharacteristics, int tag) {
if (keyCharacteristics.hwEnforced.containsTag(tag)) {
return keyCharacteristics.hwEnforced.getBoolean(tag, false);
} else {
return keyCharacteristics.swEnforced.getBoolean(tag, false);
}
}
}
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