1 files changed, 71 insertions, 0 deletions
diff --git a/ready_se/google/keymint/KM200/Applet/src/com/android/javacard/keymaster/KMSimpleValue.java b/ready_se/google/keymint/KM200/Applet/src/com/android/javacard/keymaster/KMSimpleValue.java
new file mode 100644
index 0000000..6dffd73
--- /dev/null
+++ b/ready_se/google/keymint/KM200/Applet/src/com/android/javacard/keymaster/KMSimpleValue.java
@@ -0,0 +1,71 @@
+package com.android.javacard.keymaster;
+
+import javacard.framework.ISO7816;
+import javacard.framework.ISOException;
+import javacard.framework.Util;
+
+/**
+ * KMSimpleValue corresponds to CBOR type of Simple value. It holds either true, false or NULL
+ * values. The structure is defined as struct{byte SIMPLE_VALUE_TYPE; short length; simple value }
+ */
+public class KMSimpleValue extends KMType {
+
+  public static final byte FALSE = (byte) 20;
+  public static final byte TRUE = (byte) 21;
+  public static final byte NULL = (byte) 22;
+  private static KMSimpleValue prototype;
+
+  private KMSimpleValue() {}
+
+  private static KMSimpleValue proto(short ptr) {
+    if (prototype == null) {
+      prototype = new KMSimpleValue();
+    }
+    instanceTable[KM_SIMPLE_VALUE_OFFSET] = ptr;
+    return prototype;
+  }
+
+  // pointer to an empty instance used as expression
+  public static short exp() {
+    return KMType.exp(SIMPLE_VALUE_TYPE);
+  }
+
+  public static KMSimpleValue cast(short ptr) {
+    if (heap[ptr] != SIMPLE_VALUE_TYPE) {
+      ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
+    }
+    if (!isSimpleValueValid(heap[(short) (ptr + 3)])) {
+      ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
+    }
+    return proto(ptr);
+  }
+
+  public static short instance(byte value) {
+    if (!isSimpleValueValid(value)) {
+      ISOException.throwIt(ISO7816.SW_DATA_INVALID);
+    }
+    short ptr = KMType.instance(SIMPLE_VALUE_TYPE, (short) 1);
+    heap[(short) (ptr + 3)] = value;
+    return ptr;
+  }
+
+  private static boolean isSimpleValueValid(byte value) {
+    switch (value) {
+      case TRUE:
+      case FALSE:
+      case NULL:
+        break;
+      default:
+        return false;
+    }
+    return true;
+  }
+
+  public short length() {
+    return Util.getShort(heap, (short) (instanceTable[KM_SIMPLE_VALUE_OFFSET] + 1));
+  }
+
+  public byte getValue() {
+    return heap[(short) (instanceTable[KM_SIMPLE_VALUE_OFFSET] + 3)];
+  }
+}