1 files changed, 52 insertions, 0 deletions
diff --git a/keystore/java/android/security/KeyStoreKeyCharacteristics.java b/keystore/java/android/security/KeyStoreKeyCharacteristics.java
new file mode 100644
index 0000000..c06dc3b
--- /dev/null
+++ b/keystore/java/android/security/KeyStoreKeyCharacteristics.java
@@ -0,0 +1,52 @@
+package android.security;
+
+import android.annotation.IntDef;
+import android.security.keymaster.KeymasterDefs;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Characteristics of {@code AndroidKeyStore} keys.
+ *
+ * @hide
+ */
+public abstract class KeyStoreKeyCharacteristics {
+    private KeyStoreKeyCharacteristics() {}
+
+    @Retention(RetentionPolicy.SOURCE)
+    @IntDef({Origin.GENERATED_INSIDE_TEE, Origin.GENERATED_OUTSIDE_OF_TEE, Origin.IMPORTED})
+    public @interface OriginEnum {}
+
+    /**
+     * Origin of the key.
+     */
+    public static abstract class Origin {
+        private Origin() {}
+
+        /** Key was generated inside a TEE. */
+        public static final int GENERATED_INSIDE_TEE = 1;
+
+        /** Key was generated outside of a TEE. */
+        public static final int GENERATED_OUTSIDE_OF_TEE = 2;
+
+        /** Key was imported. */
+        public static final int IMPORTED = 0;
+
+        /**
+         * @hide
+         */
+        public static @OriginEnum int fromKeymaster(int origin) {
+            switch (origin) {
+                case KeymasterDefs.KM_ORIGIN_HARDWARE:
+                    return GENERATED_INSIDE_TEE;
+                case KeymasterDefs.KM_ORIGIN_SOFTWARE:
+                    return GENERATED_OUTSIDE_OF_TEE;
+                case KeymasterDefs.KM_ORIGIN_IMPORTED:
+                    return IMPORTED;
+                default:
+                    throw new IllegalArgumentException("Unknown origin: " + origin);
+            }
+        }
+    }
+}