is a gnutls_certificate_credentials_t type.
is the certificate to find issuer for
gnutls_x509_crt_t * issuer
Will hold the issuer if any. Should be treated as
unsigned int flags
Use zero or GNUTLS_TL_GET_COPY
This function will return the issuer of a given certificate. If the
flag GNUTLS_TL_GET_COPY is specified a copy of the issuer will be
returned which must be freed using gnutls_x509_crt_deinit(). In that
case the provided issuer must not be initialized.
As with gnutls_x509_trust_list_get_issuer() this function requires
the GNUTLS_TL_GET_COPY flag in order to operate with PKCS11 trust
lists in a thread-safe way.
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gnutls 3.5.9 gnutls_certificate_get_issuer(3)