diff --git a/KeyUtil.cpp b/KeyUtil.cpp
index bd2ccdd..6d96541 100644
--- a/KeyUtil.cpp
+++ b/KeyUtil.cpp
@@ -143,7 +143,14 @@
             // A key for a v1 policy is specified by an arbitrary 8-byte
             // "descriptor", which must be provided by userspace.  We use the
             // first 8 bytes from the double SHA-512 of the key itself.
-            policy->key_raw_ref = generateKeyRef((const uint8_t*)key.data(), key.size());
+            if (options.use_hw_wrapped_key) {
+                /* When wrapped key is supported, only the first 32 bytes are
+                   the same per boot. The second 32 bytes can change as the ephemeral
+                   key is different. */
+                policy->key_raw_ref = generateKeyRef((const uint8_t*)key.data(), key.size()/2);
+            } else {
+                policy->key_raw_ref = generateKeyRef((const uint8_t*)key.data(), key.size());
+            }
             if (!buildKeySpecifier(&arg->key_spec, *policy)) {
                 return false;
             }