diff options
Diffstat (limited to 'ready_se/google/keymint/KM200/Applet/src/com/android/javacard/keymaster/KMCosePairNegIntegerTag.java')
-rw-r--r-- | ready_se/google/keymint/KM200/Applet/src/com/android/javacard/keymaster/KMCosePairNegIntegerTag.java | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/ready_se/google/keymint/KM200/Applet/src/com/android/javacard/keymaster/KMCosePairNegIntegerTag.java b/ready_se/google/keymint/KM200/Applet/src/com/android/javacard/keymaster/KMCosePairNegIntegerTag.java new file mode 100644 index 0000000..7f01202 --- /dev/null +++ b/ready_se/google/keymint/KM200/Applet/src/com/android/javacard/keymaster/KMCosePairNegIntegerTag.java @@ -0,0 +1,92 @@ +/* + * 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; + +/** + * KMCosePairNegIntegerTag represents a key-value type, where key can be KMInteger or KMNInteger and + * value is KMNInteger type. struct{byte TAG_TYPE; short length; struct{short NINT_VALUE_TYPE; short + * key; short value}}. + */ +public class KMCosePairNegIntegerTag extends KMCosePairTagType { + + private static KMCosePairNegIntegerTag prototype; + + private KMCosePairNegIntegerTag() {} + + private static KMCosePairNegIntegerTag proto(short ptr) { + if (prototype == null) { + prototype = new KMCosePairNegIntegerTag(); + } + instanceTable[KM_COSE_KEY_NINT_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_NEG_INT_TAG_TYPE); + Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), KMType.INVALID_VALUE); + Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4), KMNInteger.exp()); + return ptr; + } + + public static KMCosePairNegIntegerTag cast(short ptr) { + byte[] heap = repository.getHeap(); + if (heap[ptr] != COSE_PAIR_TAG_TYPE) { + ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED); + } + // Validate the value ptr. + short valuePtr = Util.getShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4)); + if (NEG_INTEGER_TYPE != getType(valuePtr)) { + ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED); + } + return proto(ptr); + } + + public static short instance(short keyPtr, short valuePtr) { + short offset = KMCosePairTagType.getKeyStartOffset(keyPtr); + if (!KMCosePairTagType.isKeyPairValid( + heap, offset, KMCose.COSE_KEY_MAX_SIZE, KMNInteger.cast(valuePtr).getShort())) { + 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_NEG_INT_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 short getValueType() { + return NEG_INTEGER_TYPE; + } + + @Override + public short getKeyPtr() { + return Util.getShort( + heap, (short) (instanceTable[KM_COSE_KEY_NINT_VAL_OFFSET] + TLV_HEADER_SIZE + 2)); + } + + @Override + public short getValuePtr() { + return Util.getShort( + heap, (short) (instanceTable[KM_COSE_KEY_NINT_VAL_OFFSET] + TLV_HEADER_SIZE + 4)); + } +} |