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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;
/**
* KMIntegerTag represents UINT, ULONG and DATE tags specified in keymaster hal specs. struct{byte
* TAG_TYPE; short length; struct{short UINT_TAG/ULONG_TAG/DATE_TAG; short tagKey; 4 or 8 byte
* value}}
*/
public class KMIntegerTag extends KMTag {
// Allowed tag keys.
private static final short[] tags = {
// UINT
KEYSIZE,
MIN_MAC_LENGTH,
MIN_SEC_BETWEEN_OPS,
MAX_USES_PER_BOOT,
USERID,
AUTH_TIMEOUT,
OS_VERSION,
OS_PATCH_LEVEL,
VENDOR_PATCH_LEVEL,
BOOT_PATCH_LEVEL,
MAC_LENGTH,
// ULONG
RSA_PUBLIC_EXPONENT,
// DATE
ACTIVE_DATETIME,
ORIGINATION_EXPIRE_DATETIME,
USAGE_EXPIRE_DATETIME,
CREATION_DATETIME,
CERTIFICATE_NOT_BEFORE,
CERTIFICATE_NOT_AFTER,
USAGE_COUNT_LIMIT,
// custom tag
AUTH_TIMEOUT_MILLIS,
};
private static KMIntegerTag prototype;
private KMIntegerTag() {}
private static KMIntegerTag proto(short ptr) {
if (prototype == null) {
prototype = new KMIntegerTag();
}
KMType.instanceTable[KM_INTEGER_TAG_OFFSET] = ptr;
return prototype;
}
public static short exp(short tagType) {
if (!validateTagType(tagType)) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
short intPtr = KMInteger.exp();
short ptr = instance(TAG_TYPE, (short) 6);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), tagType);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), INVALID_TAG);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4), intPtr);
return ptr;
}
public static short instance(short tagType, short key) {
if (!validateTagType(tagType)) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
if (!validateKey(key)) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
short intPtr = KMInteger.exp();
return instance(tagType, key, intPtr);
}
public static short instance(short tagType, short key, short intObj) {
if (!validateTagType(tagType)) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
if (!validateKey(key)) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
if (heap[intObj] != INTEGER_TYPE) {
ISOException.throwIt(ISO7816.SW_DATA_INVALID);
}
short ptr = instance(TAG_TYPE, (short) 6);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), tagType);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), key);
Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4), intObj);
return ptr;
}
public static KMIntegerTag cast(short ptr) {
if (heap[ptr] != TAG_TYPE) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
short tagType = Util.getShort(heap, (short) (ptr + TLV_HEADER_SIZE));
if (!validateTagType(tagType)) {
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
return proto(ptr);
}
private static boolean validateKey(short key) {
short index = (short) tags.length;
while (--index >= 0) {
if (tags[index] == key) {
return true;
}
}
return false;
}
private static boolean validateTagType(short tagType) {
return (tagType == DATE_TAG) || (tagType == UINT_TAG) || (tagType == ULONG_TAG);
}
public static short getShortValue(short tagType, short tagKey, short keyParameters) {
short ptr;
if (tagType == UINT_TAG) {
ptr = KMKeyParameters.findTag(KMType.UINT_TAG, tagKey, keyParameters);
if (ptr != KMType.INVALID_VALUE) {
ptr = KMIntegerTag.cast(ptr).getValue();
if (KMInteger.cast(ptr).getSignificantShort() == 0) {
return KMInteger.cast(ptr).getShort();
}
}
}
return KMType.INVALID_VALUE;
}
public static short getValue(
byte[] buf, short offset, short tagType, short tagKey, short keyParameters) {
short ptr;
if ((tagType == UINT_TAG) || (tagType == ULONG_TAG) || (tagType == DATE_TAG)) {
ptr = KMKeyParameters.findTag(tagType, tagKey, keyParameters);
if (ptr != KMType.INVALID_VALUE) {
ptr = KMIntegerTag.cast(ptr).getValue();
return KMInteger.cast(ptr).value(buf, offset);
}
}
return KMType.INVALID_VALUE;
}
public short getTagType() {
return Util.getShort(
heap, (short) (KMType.instanceTable[KM_INTEGER_TAG_OFFSET] + TLV_HEADER_SIZE));
}
public short getKey() {
return Util.getShort(
heap, (short) (KMType.instanceTable[KM_INTEGER_TAG_OFFSET] + TLV_HEADER_SIZE + 2));
}
public short getValue() {
return Util.getShort(
heap, (short) (KMType.instanceTable[KM_INTEGER_TAG_OFFSET] + TLV_HEADER_SIZE + 4));
}
public short length() {
KMInteger obj = KMInteger.cast(getValue());
return obj.length();
}
public boolean isValidKeySize(byte alg) {
short val = KMIntegerTag.cast(KMType.instanceTable[KM_INTEGER_TAG_OFFSET]).getValue();
if (KMInteger.cast(val).getSignificantShort() != 0) {
return false;
}
val = KMInteger.cast(val).getShort();
switch (alg) {
case KMType.RSA:
if (val == 2048) {
return true;
}
break;
case KMType.AES:
if (val == 128 || val == 256) {
return true;
}
break;
case KMType.DES:
if (val == 168) {
return true;
}
break;
case KMType.EC:
if (val == 256) {
return true;
}
break;
case KMType.HMAC:
if (val % 8 == 0 && val >= 64 && val <= 512) {
return true;
}
break;
default:
break;
}
return false;
}
}
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