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/*
* Copyright(C) 2020 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;
/**
* KMHmacSharingParameters represents HmacSharingParameters structure from android keymaster hal
* specifications. It corresponds to CBOR array type. struct{byte HMAC_SHARING_PARAM_TYPE; short
* length=2; short arrayPtr} where arrayPtr is a pointer to ordered array with following elements:
* {KMByteBlob Seed; KMByteBlob Nonce}
*/
public class KMHmacSharingParameters extends KMType {
public static final byte SEED = 0x00;
public static final byte NONCE = 0x01;
private static KMHmacSharingParameters prototype;
private KMHmacSharingParameters() {}
public static short exp() {
short arrPtr = KMArray.instance((short) 2);
KMArray arr = KMArray.cast(arrPtr);
arr.add(SEED, KMByteBlob.exp());
arr.add(NONCE, KMByteBlob.exp());
return instance(arrPtr);
}
private static KMHmacSharingParameters proto(short ptr) {
if (prototype == null) {
prototype = new KMHmacSharingParameters();
}
KMType.instanceTable[KM_HMAC_SHARING_PARAMETERS_OFFSET] = ptr;
return prototype;
}
public static short instance() {
short arrPtr = KMArray.instance((short) 2);
return instance(arrPtr);
}
public static short instance(short vals) {
short ptr = KMType.instance(HMAC_SHARING_PARAM_TYPE, (short) 2);
if (KMArray.cast(vals).length() != 2) {
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
}
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), vals);
return ptr;
}
public static KMHmacSharingParameters cast(short ptr) {
if (heap[ptr] != HMAC_SHARING_PARAM_TYPE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
short arrPtr = Util.getShort(heap, (short) (ptr + TLV_HEADER_SIZE));
if (heap[arrPtr] != ARRAY_TYPE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
return proto(ptr);
}
public short getVals() {
return Util.getShort(
heap, (short) (KMType.instanceTable[KM_HMAC_SHARING_PARAMETERS_OFFSET] + TLV_HEADER_SIZE));
}
public short length() {
short arrPtr = getVals();
return KMArray.cast(arrPtr).length();
}
public short getNonce() {
short arrPtr = getVals();
return KMArray.cast(arrPtr).get(NONCE);
}
public void setNonce(short vals) {
KMByteBlob.cast(vals);
short arrPtr = getVals();
KMArray.cast(arrPtr).add(NONCE, vals);
}
public short getSeed() {
short arrPtr = getVals();
return KMArray.cast(arrPtr).get(SEED);
}
public void setSeed(short vals) {
KMByteBlob.cast(vals);
short arrPtr = getVals();
KMArray.cast(arrPtr).add(SEED, vals);
}
}
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