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@deftypefun {int} {gnutls_x509_crt_get_signature_oid} (gnutls_x509_crt_t @var{cert}, char * @var{oid}, size_t * @var{oid_size})
@var{cert}: should contain a @code{gnutls_x509_crt_t} type
@var{oid}: a pointer to a buffer to hold the OID (may be null)
@var{oid_size}: initially holds the size of @code{oid}
This function will return the OID of the signature algorithm
that has been used to sign this certificate. This is function
is useful in the case @code{gnutls_x509_crt_get_signature_algorithm()}
returned @code{GNUTLS_SIGN_UNKNOWN} .
@strong{Returns:} zero or a negative error code on error.
@strong{Since:} 3.5.0
@end deftypefun
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