[gnutls-devel] GnuTLS | GnuTLS reports "import error: Error in the certificate" while OpenSSL and ZCertificate don't (#986)

[Development of GNU's TLS library]

Daiki Ueno commented:


This is because `tbsCertificate.signature` doesn't match the outer `signatureAlgorithm`:
```console
certtool -i --infile cert51.pem
Setting log level to 10
|<2>| signatureAlgorithm.algorithm differs from tbsCertificate.signature.algorithm: 1.2.840.113549.1.1.5, 1.2.840.113549.1.1.11
|<3>| ASSERT: x509.c[compare_sig_algorithm]:330
|<3>| ASSERT: x509.c[gnutls_x509_crt_import]:615
|<3>| ASSERT: x509.c[gnutls_x509_crt_list_import]:3834
import error: Error in the certificate.
```

As mentioned in https://gitlab.com/gnutls/gnutls/-/issues/983#note_339128307, this is not permitted according to RFC 5280.

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