fix: clang compilation
diff --git a/include/cose/cose_configure.h.in b/include/cose/cose_configure.h.in
index 5d02d5c..1afa999 100644
--- a/include/cose/cose_configure.h.in
+++ b/include/cose/cose_configure.h.in
@@ -8,17 +8,20 @@
#cmakedefine COSE_C_USE_OPENSSL
#cmakedefine COSE_C_USE_BCRYPT
+// make sure we only use one crypto library
#if defined(COSE_C_USE_MBEDTLS)
-#if defined(COSE_C_USE_OPENSSL) || defined(COSE_C_USE_BCRYPT)
-#error Only Define One Crypto Package
-#endif
+ #if defined(COSE_C_USE_OPENSSL) || defined(COSE_C_USE_BCRYPT)
+ #error Only Define One Crypto Package
+ #endif
#elif defined(COSE_C_USE_BCRYPT)
-#if defined(COSE_C_USE_OPENSSL)
-#error Only Define One Crypto Package
+ #if defined(COSE_C_USE_OPENSSL)
+ #error Only Define One Crypto Package
+ #endif
#endif
-#elif !defined(COSE_C_USE_OPENSSL)
-#include <openssl/opensslv.h>
-#define COSE_C_USE_OPENSSL
+
+// verify that we have a supported version of openssl
+#if defined(COSE_C_USE_OPENSSL)
+ #include <openssl/opensslv.h>
#endif
//
@@ -141,16 +144,16 @@
#define USE_ECDSA_SHA_256
#define USE_ECDSA_SHA_384
#define USE_ECDSA_SHA_512
-#if !defined(COSE_C_USE_MBEDTLS)
-// MBEDTLS currently supports ECDH for X25519 but not EdDSA
-#if OPENSSL_VERSION_NUMBER > 0x10100000L
-// Requires OPEN SSL 1.1.1 to build
-#define USE_EDDSA
-#else
-#define STRINGIFY(x) #x
-#define TOSTRING(x) STRINGIFY(x)
-#pragma message("OPENSSL VERSION IS " OPENSSL_VERSION_TEXT)
-#endif
+#if defined(COSE_C_USE_OPENSSL)
+ // MBEDTLS currently supports ECDH for X25519 but not EdDSA
+ #if OPENSSL_VERSION_NUMBER > 0x10100000L
+ // Requires OPEN SSL 1.1.1 to build
+ #define USE_EDDSA
+ #else
+ #define STRINGIFY(x) #x
+ #define TOSTRING(x) STRINGIFY(x)
+ #pragma message("OPENSSL VERSION IS " OPENSSL_VERSION_TEXT)
+ #endif
#endif // !defined (COSE_C_USE_MBEDTLS)
//
