the session for which this will be registered
const char * name
the name of the supplemental data to register
the type of the supplemental data format
the function to receive the data
the function to send the data
must be zero
This function will register a new supplemental data type (rfc4680).
The registered supplemental functions will be used for that specific
session. The provided type must be an unassigned type in
If the type is already registered or handled by GnuTLS internally
GNUTLS_E_ALREADY_REGISTERED will be returned.
As supplemental data are not defined under TLS 1.3, this function
will disable TLS 1.3 support for the given session.
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