Check threshold for MBEDTLS_X509_MAX_INTERMEDIATE_CA in X509 tests
The X509 test suite assumes that MBEDTLS_X509_MAX_INTERMEDIATE_CA is below the
hardcoded threshold 20 used in the long certificate chain generating script
tests/data_files/dir-max/long.sh. This commit adds a compile-time check for
that.
#include "mbedtls/oid.h"
#include "mbedtls/base64.h"
+#if MBEDTLS_X509_MAX_INTERMEDIATE_CA >= 19
+#error "The value of MBEDTLS_X509_MAX_INTERMEDIATE_C is larger \
+than the current threshold 19. To test larger values, please \
+adapt the script tests/data_files/dir-max/long.sh."
+#endif
+
/* Profile for backward compatibility. Allows SHA-1, unlike the default
profile. */
const mbedtls_x509_crt_profile compat_profile =
