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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;
/**
* KMByteBlob represents contiguous block of bytes. It corresponds to CBOR type of Byte String. It
* extends KMType by specifying value field as zero or more sequence of bytes. struct{byte
* BYTE_BLOB_TYPE; short length; sequence of bytes}
*/
public class KMByteBlob extends KMType {
private static byte OFFSET_SIZE = 2;
private static KMByteBlob prototype;
protected KMByteBlob() {}
private static KMByteBlob proto(short ptr) {
if (prototype == null) {
prototype = new KMByteBlob();
}
KMType.instanceTable[KM_BYTE_BLOB_OFFSET] = ptr;
return prototype;
}
// pointer to an empty instance used as expression
public static short exp() {
return KMType.exp(BYTE_BLOB_TYPE);
}
// return an empty byte blob instance
public static short instance(short length) {
short ptr = KMType.instance(BYTE_BLOB_TYPE, (short) (length + 2));
Util.setShort(
heap, (short) (ptr + TLV_HEADER_SIZE), (short) (ptr + TLV_HEADER_SIZE + OFFSET_SIZE));
Util.setShort(heap, (short) (ptr + 1), length);
return ptr;
}
// byte blob from existing buf
public static short instance(byte[] buf, short startOff, short length) {
short ptr = instance(length);
Util.arrayCopyNonAtomic(
buf, startOff, heap, (short) (ptr + TLV_HEADER_SIZE + OFFSET_SIZE), length);
return ptr;
}
// cast the ptr to KMByteBlob
public static KMByteBlob cast(short ptr) {
if (heap[ptr] != BYTE_BLOB_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);
}
// Add the byte
public void add(short index, byte val) {
short len = length();
if (index >= len) {
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
}
heap[(short) (getStartOff() + index)] = val;
}
// Get the byte
public byte get(short index) {
short len = length();
if (index >= len) {
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
}
return heap[(short) (getStartOff() + index)];
}
// Get the start of blob
public short getStartOff() {
return Util.getShort(heap, (short) (getBaseOffset() + TLV_HEADER_SIZE));
}
public void setStartOff(short offset) {
Util.setShort(heap, (short) (getBaseOffset() + TLV_HEADER_SIZE), offset);
}
// Get the length of the blob
public short length() {
return Util.getShort(heap, (short) (getBaseOffset() + 1));
}
// Get the buffer pointer in which blob is contained.
public byte[] getBuffer() {
return heap;
}
public void getValue(byte[] destBuf, short destStart, short destLength) {
Util.arrayCopyNonAtomic(heap, getStartOff(), destBuf, destStart, destLength);
}
public short getValues(byte[] destBuf, short destStart) {
short destLength = length();
Util.arrayCopyNonAtomic(heap, getStartOff(), destBuf, destStart, destLength);
return destLength;
}
public void setValue(byte[] srcBuf, short srcStart, short srcLength) {
if (length() < srcLength) {
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
}
Util.arrayCopyNonAtomic(srcBuf, srcStart, heap, getStartOff(), srcLength);
setLength(srcLength);
}
public boolean isValid() {
return (length() != 0);
}
protected short getBaseOffset() {
return instanceTable[KM_BYTE_BLOB_OFFSET];
}
public void setLength(short len) {
Util.setShort(heap, (short) (getBaseOffset() + 1), len);
}
}
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