Use JCA names for block modes, paddings, and digests.
This replaces int-based enums from KeyStoreKeyConstraints with
String values commonly used in JCA API.
As part of under the hood refactoring:
* KeyStoreKeyCharacteristics and KeyStoreKeyConstraints have been
merged into KeyStoreKeyProperties.
* KeymasterUtils methods operating on KeymasterArguments and
KeymasterCharacteristics have been moved to their respective
classes.
Bug: 18088752
Change-Id: I9c8b984cb3c28184adb617e34d87f2837bd1d3a1
diff --git a/keystore/java/android/security/ArrayUtils.java b/keystore/java/android/security/ArrayUtils.java
new file mode 100644
index 0000000..2047d3f
--- /dev/null
+++ b/keystore/java/android/security/ArrayUtils.java
@@ -0,0 +1,62 @@
+package android.security;
+
+import libcore.util.EmptyArray;
+
+/**
+ * @hide
+ */
+abstract class ArrayUtils {
+ private ArrayUtils() {}
+
+ public static String[] nullToEmpty(String[] array) {
+ return (array != null) ? array : EmptyArray.STRING;
+ }
+
+ public static String[] cloneIfNotEmpty(String[] array) {
+ return ((array != null) && (array.length > 0)) ? array.clone() : array;
+ }
+
+ public static byte[] concat(byte[] arr1, byte[] arr2) {
+ return concat(arr1, 0, (arr1 != null) ? arr1.length : 0,
+ arr2, 0, (arr2 != null) ? arr2.length : 0);
+ }
+
+ public static byte[] concat(byte[] arr1, int offset1, int len1, byte[] arr2, int offset2,
+ int len2) {
+ if (len1 == 0) {
+ return subarray(arr2, offset2, len2);
+ } else if (len2 == 0) {
+ return subarray(arr1, offset1, len1);
+ } else {
+ byte[] result = new byte[len1 + len2];
+ System.arraycopy(arr1, offset1, result, 0, len1);
+ System.arraycopy(arr2, offset2, result, len1, len2);
+ return result;
+ }
+ }
+
+ public static byte[] subarray(byte[] arr, int offset, int len) {
+ if (len == 0) {
+ return EmptyArray.BYTE;
+ }
+ if ((offset == 0) && (len == arr.length)) {
+ return arr;
+ }
+ byte[] result = new byte[len];
+ System.arraycopy(arr, offset, result, 0, len);
+ return result;
+ }
+
+ public static int[] concat(int[] arr1, int[] arr2) {
+ if ((arr1 == null) || (arr1.length == 0)) {
+ return arr2;
+ } else if ((arr2 == null) || (arr2.length == 0)) {
+ return arr1;
+ } else {
+ int[] result = new int[arr1.length + arr2.length];
+ System.arraycopy(arr1, 0, result, 0, arr1.length);
+ System.arraycopy(arr2, 0, result, arr1.length, arr2.length);
+ return result;
+ }
+ }
+}