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gnutls_prf_rfc5705(3) gnutls gnutls_prf_rfc5705(3) NAME gnutls_prf_rfc5705 - API function SYNOPSIS #include <gnutls/gnutls.h> int gnutls_prf_rfc5705(gnutls_session_t session, size_t label_size, const char * label, size_t context_size, const char * context, size_t outsize, char * out); ARGUMENTS gnutls_session_t session is a gnutls_session_t type. size_t label_size length of the label variable. const char * label label used in PRF computation, typically a short string. size_t context_size length of the extra variable. const char * context optional extra data to seed the PRF with. size_t outsize size of pre-allocated output buffer to hold the output. char * out pre-allocated buffer to hold the generated data. DESCRIPTION Exports keying material from TLS/DTLS session to an application, as specified in RFC5705. In the TLS versions prior to 1.3, it applies the TLS Pseudo-Random-Function (PRF) on the master secret and the provided data, seeded with the client and server random fields. In TLS 1.3, it applies HKDF on the exporter master secret derived from the master secret. The label variable usually contains a string denoting the purpose for the generated data. The context variable can be used to add more data to the seed, after the random variables. It can be used to make sure the generated output is strongly connected to some additional data (e.g., a string used in user authentication). The output is placed in out , which must be pre-allocated. Note that, to provide the RFC5705 context, the context variable must be non-null. RETURNS GNUTLS_E_SUCCESS on success, or an error code. COPYRIGHT Copyright (C) 2001- Free Software Foundation, Inc., and others. Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. SEE ALSO The full documentation for gnutls is maintained as a Texinfo manual. If the /usr/local/share/doc/gnutls/ directory does not contain the HTML form visit https://www.gnutls.org/manual/ gnutls 3.7.9 gnutls_prf_rfc5705(3)