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/*
* Copyright(C) 2021 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 com.android.javacard.keymaster;
import javacard.framework.ISO7816;
import javacard.framework.ISOException;
import javacard.framework.Util;
/**
* KMCosePairNegIntegerTag represents a key-value type, where key can be KMInteger or KMNInteger and
* value is KMNInteger type. struct{byte TAG_TYPE; short length; struct{short NINT_VALUE_TYPE; short
* key; short value}}.
*/
public class KMCosePairNegIntegerTag extends KMCosePairTagType {
private static KMCosePairNegIntegerTag prototype;
private KMCosePairNegIntegerTag() {}
private static KMCosePairNegIntegerTag proto(short ptr) {
if (prototype == null) {
prototype = new KMCosePairNegIntegerTag();
}
instanceTable[KM_COSE_KEY_NINT_VAL_OFFSET] = ptr;
return prototype;
}
// pointer to an empty instance used as expression
public static short exp() {
short ptr = instance(COSE_PAIR_TAG_TYPE, (short) 6);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), KMType.COSE_PAIR_NEG_INT_TAG_TYPE);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), KMType.INVALID_VALUE);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4), KMNInteger.exp());
return ptr;
}
public static KMCosePairNegIntegerTag cast(short ptr) {
byte[] heap = repository.getHeap();
if (heap[ptr] != COSE_PAIR_TAG_TYPE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
// Validate the value ptr.
short valuePtr = Util.getShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4));
if (NEG_INTEGER_TYPE != getType(valuePtr)) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
return proto(ptr);
}
public static short instance(short keyPtr, short valuePtr) {
short offset = KMCosePairTagType.getKeyStartOffset(keyPtr);
if (!KMCosePairTagType.isKeyPairValid(
heap, offset, KMCose.COSE_KEY_MAX_SIZE, KMNInteger.cast(valuePtr).getShort())) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
short ptr = KMType.instance(COSE_PAIR_TAG_TYPE, (short) 6);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), KMType.COSE_PAIR_NEG_INT_TAG_TYPE);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), keyPtr);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4), valuePtr);
return ptr;
}
public short getValueType() {
return NEG_INTEGER_TYPE;
}
@Override
public short getKeyPtr() {
return Util.getShort(
heap, (short) (instanceTable[KM_COSE_KEY_NINT_VAL_OFFSET] + TLV_HEADER_SIZE + 2));
}
@Override
public short getValuePtr() {
return Util.getShort(
heap, (short) (instanceTable[KM_COSE_KEY_NINT_VAL_OFFSET] + TLV_HEADER_SIZE + 4));
}
}
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