scripts/external.test connects to www.wolfssl.com without a server_name
extension, so the CDN in front of that host answers with its own default
certificate rather than the wolfSSL one. That chain currently runs through
the RSA-4096 GlobalSign Root R46, while the intended chain is RSA-2048
throughout, so the test only passes on builds able to verify a 4096-bit
signature.
Two PRB configurations fail on master because of it. The fastmath leg with
FP_MAX_BITS=6144 reports BUFFER_E, and the 32-bit leg reports
ASN_SIG_CONFIRM_E because a build without WOLFSSL_X86_64_BUILD,
WOLFSSL_AARCH64_BUILD or OPENSSL_EXTRA defaults SP_INT_BITS to 3072. Both
are correct refusals to handle a key larger than the build supports, so the
test, not the library, is what needs fixing.
Name the host with -S in both client invocations. The option is a no-op
where the build lacks SNI, so those configurations keep their current
behavior, and the check uses the client's own "-S check" probe to decide.
Verified by building master with CFLAGS=-DSP_INT_BITS=3072, which
reproduces the BUFFER_E failure, and confirming the test passes with this
change in the same build and in an --enable-all build.
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