contains a certificate list (path) for the specified private key
const gnutls_datum_t * key
is the private key, or NULL
gnutls_x509_crt_fmt_t type
is PEM or DER
DESCRIPTION
This function sets a certificate/private key pair in the
gnutls_certificate_credentials_t structure. This function may be called
more than once (in case multiple keys/certificates exist for the
server).
DSA private keys are encoded the OpenSSL way, which is an ASN.1
DER sequence of 6 INTEGERs - version, p, q, g, pub, priv.
Note that the keyUsage (2.5.29.15) PKIX extension in X.509 certificates
is supported. This means that certificates intended for signing cannot
be used for ciphersuites that require encryption.
If the certificate and the private key are given in PEM encoding
then the strings that hold their values must be null terminated.
The key may be NULL if you are using a sign callback, see
gnutls_sign_callback_set().