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@deftypefun {int} {gnutls_certificate_get_issuer} (gnutls_certificate_credentials_t @var{sc}, gnutls_x509_crt_t @var{cert}, gnutls_x509_crt_t * @var{issuer}, unsigned int @var{flags})
@var{sc}: is a @code{gnutls_certificate_credentials_t} type.
@var{cert}: is the certificate to find issuer for
@var{issuer}: Will hold the issuer if any. Should be treated as constant.
@var{flags}: Use zero or @code{GNUTLS_TL_GET_COPY}
This function will return the issuer of a given certificate.
If the flag @code{GNUTLS_TL_GET_COPY} is specified a copy of the issuer
will be returned which must be freed using @code{gnutls_x509_crt_deinit()} .
In that case the provided @code{issuer} must not be initialized.
As with @code{gnutls_x509_trust_list_get_issuer()} this function requires
the @code{GNUTLS_TL_GET_COPY} flag in order to operate with PKCS@code{11} trust
lists in a thread-safe way.
@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS} (0) is returned, otherwise a
negative error value.
@strong{Since:} 3.0
@end deftypefun
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