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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;
/**
* KMCosePairByteBlobTag represents a key-value type, where key can be KMInteger or KMNInteger and
* value is KMByteBlob type. struct{byte TAG_TYPE; short length; struct{short BYTE_BLOB_TYPE; short
* key; short value}}.
*/
public class KMCosePairByteBlobTag extends KMCosePairTagType {
public static Object[] keys;
private static KMCosePairByteBlobTag prototype;
private KMCosePairByteBlobTag() {}
private static KMCosePairByteBlobTag proto(short ptr) {
if (prototype == null) {
prototype = new KMCosePairByteBlobTag();
}
instanceTable[KM_COSE_KEY_BYTE_BLOB_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_BYTE_BLOB_TAG_TYPE);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), KMType.INVALID_VALUE);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4), KMByteBlob.exp());
return ptr;
}
public static short instance(short keyPtr, short valuePtr) {
if (!isKeyValueValid(keyPtr)) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
if (KMType.getType(valuePtr) != BYTE_BLOB_TYPE) {
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_BYTE_BLOB_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 static KMCosePairByteBlobTag cast(short ptr) {
byte[] heap = repository.getHeap();
if (heap[ptr] != COSE_PAIR_TAG_TYPE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
// Validate the value pointer.
short valuePtr = Util.getShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4));
if (KMType.getType(valuePtr) != BYTE_BLOB_TYPE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
return proto(ptr);
}
private static void createKeys() {
if (keys == null) {
keys =
new Object[] {
(Object) new byte[] {(byte) 0, (byte) 0, (byte) 0, KMCose.COSE_KEY_PUBKEY_X},
(Object) new byte[] {(byte) 0, (byte) 0, (byte) 0, KMCose.COSE_KEY_PUBKEY_Y},
(Object) new byte[] {(byte) 0, (byte) 0, (byte) 0, KMCose.COSE_KEY_PRIV_KEY},
(Object) new byte[] {(byte) 0, (byte) 0, (byte) 0, KMCose.COSE_LABEL_IV},
(Object) new byte[] {(byte) 0, (byte) 0, (byte) 0, KMCose.COSE_LABEL_KEYID},
(Object) new byte[] {(byte) 0, (byte) 0, (byte) 0, KMCose.COSE_KEY_KEY_ID},
(Object) KMCose.SUBJECT_PUBLIC_KEY,
(Object) KMCose.KEY_USAGE
};
}
}
public static boolean isKeyValueValid(short keyPtr) {
createKeys();
short type = KMType.getType(keyPtr);
short offset = 0;
if (type == INTEGER_TYPE) {
offset = KMInteger.cast(keyPtr).getStartOff();
} else if (type == NEG_INTEGER_TYPE) {
offset = KMNInteger.cast(keyPtr).getStartOff();
} else {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
short index = 0;
while (index < (short) keys.length) {
if (0
== Util.arrayCompare(
(byte[]) keys[index],
(short) 0,
heap,
offset,
(short) ((byte[]) keys[index]).length)) {
return true;
}
index++;
}
return false;
}
public short getValueType() {
return BYTE_BLOB_TYPE;
}
@Override
public short getKeyPtr() {
return Util.getShort(
heap, (short) (instanceTable[KM_COSE_KEY_BYTE_BLOB_VAL_OFFSET] + TLV_HEADER_SIZE + 2));
}
@Override
public short getValuePtr() {
return Util.getShort(
heap, (short) (instanceTable[KM_COSE_KEY_BYTE_BLOB_VAL_OFFSET] + TLV_HEADER_SIZE + 4));
}
}
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