gnutls_certificate_set_openpgp_keyring_file - Sets a keyring file for
c, const char * file, gnutls_openpgp_crt_fmt_t format);
A certificate credentials structure
const char * file
filename of the keyring.
format of keyring.
The function is used to set keyrings that will be used internally by
various OpenPGP functions. For example to find a key when it is needed
for an operations. The keyring will also be used at the verification
On success, GNUTLS_E_SUCCESS is returned, otherwise a negative error
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