| /* |
| * 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; |
| |
| /** |
| * KMCoseCertPayload represents the COSE_Sign1 payload for each certificate in BCC. The supported |
| * key types are KMInteger, KMNInteger and the supported value types are KMByteBlob and |
| * KMTextString. It corresponds to a CBOR Map type. struct{byte TAG_TYPE; short length; short |
| * arrayPtr } where arrayPtr is a pointer to array with any KMCosePairTagType subtype instances. |
| */ |
| public class KMCoseCertPayload extends KMCoseMap { |
| |
| private static KMCoseCertPayload prototype; |
| |
| private KMCoseCertPayload() {} |
| |
| private static KMCoseCertPayload proto(short ptr) { |
| if (prototype == null) { |
| prototype = new KMCoseCertPayload(); |
| } |
| instanceTable[KM_COSE_CERT_PAYLOAD_OFFSET] = ptr; |
| return prototype; |
| } |
| |
| public static short exp() { |
| short arrPtr = KMArray.instance((short) 2); |
| KMArray arr = KMArray.cast(arrPtr); |
| arr.add((short) 0, KMCosePairTextStringTag.exp()); |
| arr.add((short) 1, KMCosePairByteBlobTag.exp()); |
| return KMCoseCertPayload.instance(arrPtr); |
| } |
| |
| public static short instance(short vals) { |
| short ptr = KMType.instance(COSE_CERT_PAYLOAD_TYPE, (short) 2); |
| Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), vals); |
| return ptr; |
| } |
| |
| public static KMCoseCertPayload cast(short ptr) { |
| if (heap[ptr] != COSE_CERT_PAYLOAD_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); |
| } |
| |
| @Override |
| public short getVals() { |
| return Util.getShort( |
| heap, (short) (instanceTable[KM_COSE_CERT_PAYLOAD_OFFSET] + TLV_HEADER_SIZE)); |
| } |
| |
| @Override |
| public short length() { |
| short arrPtr = getVals(); |
| return KMArray.cast(arrPtr).length(); |
| } |
| |
| @Override |
| public void canonicalize() { |
| KMCoseMap.canonicalize(getVals()); |
| } |
| |
| private short getValueType(short key, short significantKey) { |
| short arr = getVals(); |
| short length = length(); |
| short keyPtr; |
| short valPtr = 0; |
| short index = 0; |
| short tagType; |
| boolean found = false; |
| while (index < length) { |
| tagType = KMCosePairTagType.getTagValueType(KMArray.cast(arr).get(index)); |
| switch (tagType) { |
| case KMType.COSE_PAIR_BYTE_BLOB_TAG_TYPE: |
| keyPtr = KMCosePairByteBlobTag.cast(KMArray.cast(arr).get(index)).getKeyPtr(); |
| if (key == KMCosePairTagType.getKeyValueShort(keyPtr) |
| && significantKey == KMCosePairTagType.getKeyValueSignificantShort(keyPtr)) { |
| valPtr = KMCosePairByteBlobTag.cast(KMArray.cast(arr).get(index)).getValuePtr(); |
| found = true; |
| } |
| break; |
| case KMType.COSE_PAIR_TEXT_STR_TAG_TYPE: |
| keyPtr = KMCosePairTextStringTag.cast(KMArray.cast(arr).get(index)).getKeyPtr(); |
| if (key == (byte) KMCosePairTagType.getKeyValueShort(keyPtr)) { |
| valPtr = KMCosePairTextStringTag.cast(KMArray.cast(arr).get(index)).getValuePtr(); |
| found = true; |
| } |
| break; |
| default: |
| break; |
| } |
| if (found) { |
| break; |
| } |
| index++; |
| } |
| return valPtr; |
| } |
| |
| public short getSubjectPublicKey() { |
| return getValueType( |
| Util.getShort(KMCose.SUBJECT_PUBLIC_KEY, (short) 2), // LSB |
| Util.getShort(KMCose.SUBJECT_PUBLIC_KEY, (short) 0) // MSB (Significant) |
| ); |
| } |
| |
| public short getSubject() { |
| return getValueType(KMCose.SUBJECT, KMType.INVALID_VALUE); |
| } |
| |
| public short getIssuer() { |
| return getValueType(KMCose.ISSUER, KMType.INVALID_VALUE); |
| } |
| } |