Add wc_SignCertCb API for external signing implementations #9625
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Tied to this PR: wolfSSL/wolfTPM#449
This pull request introduces support for signing X.509 certificates using an external callback, allowing integration with hardware security modules (HSMs), TPMs, or other custom signing implementations. The changes include a new API, its implementation, and corresponding unit tests to ensure proper functionality and error handling.
New external signing support:
wc_SignCertCb_tand the API functionwc_SignCertCbtoasn_public.h, enabling certificate signing via a user-provided callback for external cryptographic devices or custom logic.wc_SignCertCbinasn.c, including handling for both RSA and non-RSA signatures, buffer management, and error cases.Testing and validation:
test_wc_SignCertCbintest_asn.c, including a mock RSA signing callback, certificate generation, signature verification, and error case coverage.