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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;
/**
* Represents 8-bit, 16-bit, 32-bit and 64-bit signed integer. It corresponds to CBOR int type.
* struct{byte NEG_INTEGER_TYPE; short length; 4 or 8 bytes of value}
*/
public class KMNInteger extends KMInteger {
public static final byte SIGNED_MASK = (byte) 0x80;
private static KMNInteger prototype;
private KMNInteger() {}
private static KMNInteger proto(short ptr) {
if (prototype == null) {
prototype = new KMNInteger();
}
instanceTable[KM_NEG_INTEGER_OFFSET] = ptr;
return prototype;
}
public static short exp() {
return KMType.exp(NEG_INTEGER_TYPE);
}
// return an empty integer instance
public static short instance(short length) {
if ((length <= 0) || (length > 8)) {
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
}
if (length > 4) {
length = KMInteger.UINT_64;
} else {
length = KMInteger.UINT_32;
}
return KMType.instance(NEG_INTEGER_TYPE, length);
}
public static short instance(byte[] num, short srcOff, short length) {
if (length > 8) {
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
}
if (length == 1) {
return uint_8(num[srcOff]);
} else if (length == 2) {
return uint_16(Util.getShort(num, srcOff));
} else if (length == 4) {
return uint_32(num, srcOff);
} else {
return uint_64(num, srcOff);
}
}
public static KMNInteger cast(short ptr) {
byte[] heap = repository.getHeap();
if (heap[ptr] != NEG_INTEGER_TYPE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
if (Util.getShort(heap, (short) (ptr + 1)) == INVALID_VALUE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
return proto(ptr);
}
// create integer and copy byte value
public static short uint_8(byte num) {
if (num >= 0) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
short ptr = instance(KMInteger.UINT_32);
heap[(short) (ptr + TLV_HEADER_SIZE + 3)] = num;
return ptr;
}
// create integer and copy short value
public static short uint_16(short num) {
if (num >= 0) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
short ptr = instance(KMInteger.UINT_32);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), num);
return ptr;
}
// create integer and copy integer value
public static short uint_32(byte[] num, short offset) {
if (!isSignedInteger(num, offset)) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
short ptr = instance(KMInteger.UINT_32);
Util.arrayCopy(num, offset, heap, (short) (ptr + TLV_HEADER_SIZE), KMInteger.UINT_32);
return ptr;
}
// create integer and copy integer value
public static short uint_64(byte[] num, short offset) {
if (!isSignedInteger(num, offset)) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
short ptr = instance(KMInteger.UINT_64);
Util.arrayCopy(num, offset, heap, (short) (ptr + TLV_HEADER_SIZE), KMInteger.UINT_64);
return ptr;
}
public static boolean isSignedInteger(byte[] num, short offset) {
byte val = num[offset];
return SIGNED_MASK == (val & SIGNED_MASK);
}
@Override
protected short getBaseOffset() {
return instanceTable[KM_NEG_INTEGER_OFFSET];
}
}
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