COSE unprotected parameters are a map not a bstr

As per RFC 8152 section 3, the unprotected parameters in the headers
of COSE objects are just encoded as a map, not as a bstr that contains
the CBOR-encoding of a map.

Test: TreeHugger presubmit
Change-Id: Id4eeb023d3a81ad1398d78d410c8224bf941f9b1

1 files changed, 1 insertions, 1 deletions

diff --git a/security/keymint/support/remote_prov_utils.cpp b/security/keymint/support/remote_prov_utils.cpp
index 111cb309b0..3e4f3f750e 100644
--- a/security/keymint/support/remote_prov_utils.cpp
+++ b/security/keymint/support/remote_prov_utils.cpp
@@ -83,7 +83,7 @@ ErrMsgOr<bytevec> verifyAndParseCoseSign1Cwt(bool ignoreSignature, const cppbor:
     }
 
     const cppbor::Bstr* protectedParams = coseSign1->get(kCoseSign1ProtectedParams)->asBstr();
-    const cppbor::Bstr* unprotectedParams = coseSign1->get(kCoseSign1UnprotectedParams)->asBstr();
+    const cppbor::Map* unprotectedParams = coseSign1->get(kCoseSign1UnprotectedParams)->asMap();
     const cppbor::Bstr* payload = coseSign1->get(kCoseSign1Payload)->asBstr();
     const cppbor::Bstr* signature = coseSign1->get(kCoseSign1Signature)->asBstr();