1 files changed, 165 insertions, 0 deletions
diff --git a/ready_se/google/keymint/KM300/Applet/src/com/android/javacard/keymaster/KMArray.java b/ready_se/google/keymint/KM300/Applet/src/com/android/javacard/keymaster/KMArray.java
new file mode 100644
index 0000000..aa54d54
--- /dev/null
+++ b/ready_se/google/keymint/KM300/Applet/src/com/android/javacard/keymaster/KMArray.java
@@ -0,0 +1,165 @@
+/*
+ * 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;
+
+/**
+ * KMArray represents an array of KMTypes. Array is the sequence of elements of one or more sub
+ * types of KMType. It also acts as a vector of one subtype of KMTypes on the lines of class KMArray
+ * <subType>, where subType is subclass of KMType. Vector is the sequence of elements of one sub
+ * type e.g. KMType.BYTE_BLOB_TYPE. The KMArray instance maps to the CBOR type array. KMArray is a
+ * KMType and it further extends the value field in TLV_HEADER as ARRAY_HEADER struct{short subType;
+ * short length;} followed by sequence of short pointers to KMType instances. The subType can be 0
+ * if this is an array or subType is short KMType value e.g. KMType.BYTE_BLOB_TYPE if this is a
+ * vector of that sub type.
+ */
+public class KMArray extends KMType {
+
+  public static final short ANY_ARRAY_LENGTH = 0x1000;
+  private static final byte ARRAY_HEADER_SIZE = 4;
+  private static KMArray prototype;
+
+  private KMArray() {}
+
+  private static KMArray proto(short ptr) {
+    if (prototype == null) {
+      prototype = new KMArray();
+    }
+    KMType.instanceTable[KM_ARRAY_OFFSET] = ptr;
+    return prototype;
+  }
+
+  public static short exp() {
+    short ptr = instance(ARRAY_TYPE, (short) ARRAY_HEADER_SIZE);
+    Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), KMType.INVALID_VALUE);
+    Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), ANY_ARRAY_LENGTH);
+    return ptr;
+  }
+
+  public static short exp(short type) {
+    short ptr = instance(ARRAY_TYPE, (short) ARRAY_HEADER_SIZE);
+    Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), type);
+    Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), ANY_ARRAY_LENGTH);
+    return ptr;
+  }
+
+  public static short instance(short length) {
+    short ptr = KMType.instance(ARRAY_TYPE, (short) (ARRAY_HEADER_SIZE + (length * 2)));
+    Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), KMType.INVALID_VALUE);
+    Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), length);
+    return ptr;
+  }
+
+  public static short instance(short length, byte type) {
+    short ptr = instance(length);
+    Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), type);
+    return ptr;
+  }
+
+  public static KMArray cast(short ptr) {
+    if (heap[ptr] != ARRAY_TYPE) {
+      ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
+    }
+    return proto(ptr);
+  }
+
+  public void add(short index, short objPtr) {
+    short len = length();
+    if (index >= len) {
+      ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
+    }
+    Util.setShort(heap, (short) (getStartOff() + (short) (index * 2)), objPtr);
+  }
+
+  public short get(short index) {
+    short len = length();
+    if (index >= len) {
+      ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
+    }
+    return Util.getShort(heap, (short) (getStartOff() + (short) (index * 2)));
+  }
+
+  public void swap(short index1, short index2) {
+    short len = length();
+    if (index1 >= len || index2 >= len) {
+      ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
+    }
+    short indexPtr1 =
+        Util.getShort(
+            heap,
+            (short)
+                (instanceTable[KM_ARRAY_OFFSET]
+                    + TLV_HEADER_SIZE
+                    + ARRAY_HEADER_SIZE
+                    + (short) (index1 * 2)));
+    short indexPtr2 =
+        Util.getShort(
+            heap,
+            (short)
+                (instanceTable[KM_ARRAY_OFFSET]
+                    + TLV_HEADER_SIZE
+                    + ARRAY_HEADER_SIZE
+                    + (short) (index2 * 2)));
+    Util.setShort(
+        heap,
+        (short)
+            (instanceTable[KM_ARRAY_OFFSET]
+                + TLV_HEADER_SIZE
+                + ARRAY_HEADER_SIZE
+                + (short) (index1 * 2)),
+        indexPtr2);
+    Util.setShort(
+        heap,
+        (short)
+            (instanceTable[KM_ARRAY_OFFSET]
+                + TLV_HEADER_SIZE
+                + ARRAY_HEADER_SIZE
+                + (short) (index2 * 2)),
+        indexPtr1);
+  }
+
+  public short containedType() {
+    return Util.getShort(heap, (short) (KMType.instanceTable[KM_ARRAY_OFFSET] + TLV_HEADER_SIZE));
+  }
+
+  public short getStartOff() {
+    return (short) (KMType.instanceTable[KM_ARRAY_OFFSET] + TLV_HEADER_SIZE + ARRAY_HEADER_SIZE);
+  }
+
+  public short length() {
+    return Util.getShort(
+        heap, (short) (KMType.instanceTable[KM_ARRAY_OFFSET] + TLV_HEADER_SIZE + 2));
+  }
+
+  public short setLength(short len) {
+    return Util.setShort(
+        heap, (short) (KMType.instanceTable[KM_ARRAY_OFFSET] + TLV_HEADER_SIZE + 2), len);
+  }
+
+  public byte[] getBuffer() {
+    return heap;
+  }
+
+  public void deleteLastEntry() {
+    short len = length();
+    Util.setShort(
+        heap, (short) (instanceTable[KM_ARRAY_OFFSET] + TLV_HEADER_SIZE + 2), (short) (len - 1));
+  }
+}