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package com.android.javacard.keymaster;
import javacard.framework.ISO7816;
import javacard.framework.ISOException;
import javacard.framework.Util;
/**
* KMCosePairCoseKeyTag represents a key-value type, where key can be KMInteger or KMNInteger and
* value is KMCoseKey type. struct{byte TAG_TYPE; short length; struct{short COSE_KEY_VALUE_TYPE;
* short key; short value}}.
*/
public class KMCosePairCoseKeyTag extends KMCosePairTagType {
public static final byte[] keys = {KMCose.COSE_LABEL_COSE_KEY};
private static KMCosePairCoseKeyTag prototype;
private KMCosePairCoseKeyTag() {}
private static KMCosePairCoseKeyTag proto(short ptr) {
if (prototype == null) {
prototype = new KMCosePairCoseKeyTag();
}
instanceTable[KM_COSE_KEY_COSE_KEY_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_COSE_KEY_TAG_TYPE);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), KMType.INVALID_VALUE);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4), KMCoseKey.exp());
return ptr;
}
public static short instance(short keyPtr, short valuePtr) {
if (!isKeyValueValid(KMCosePairTagType.getKeyValueShort(keyPtr))) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
if (KMType.getType(valuePtr) != COSE_KEY_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_COSE_KEY_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 KMCosePairCoseKeyTag 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) != COSE_KEY_TYPE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
return proto(ptr);
}
public static boolean isKeyValueValid(short keyVal) {
short index = 0;
while (index < (short) keys.length) {
if ((byte) (keyVal & 0xFF) == keys[index]) {
return true;
}
index++;
}
return false;
}
@Override
public short getKeyPtr() {
return Util.getShort(
heap, (short) (instanceTable[KM_COSE_KEY_COSE_KEY_VAL_OFFSET] + TLV_HEADER_SIZE + 2));
}
@Override
public short getValuePtr() {
return Util.getShort(
heap, (short) (instanceTable[KM_COSE_KEY_COSE_KEY_VAL_OFFSET] + TLV_HEADER_SIZE + 4));
}
}
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