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-rw-r--r--identity/aidl/default/libeic/EicCommon.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/identity/aidl/default/libeic/EicCommon.h b/identity/aidl/default/libeic/EicCommon.h
index 476276ebcf..2a08a35f65 100644
--- a/identity/aidl/default/libeic/EicCommon.h
+++ b/identity/aidl/default/libeic/EicCommon.h
@@ -21,6 +21,9 @@
#ifndef ANDROID_HARDWARE_IDENTITY_EIC_COMMON_H
#define ANDROID_HARDWARE_IDENTITY_EIC_COMMON_H
+// KeyMint auth-challenges are 64-bit numbers and 0 typically means unset.
+#define EIC_KM_AUTH_CHALLENGE_UNSET 0
+
// Feature version 202009:
//
// CredentialKeys = [