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int gnutls_prf(gnutls_session_t session, size_t label_size, const char
* label, int server_random_first, size_t extra_size, const char *
extra, size_t outsize, char * out);
is a gnutls_session_t structure.
length of the label variable.
const char * label
label used in PRF computation, typically a short string.
non-0 if server random field should be first in seed
length of the extra variable.
const char * extra
optional extra data to seed the PRF with.
size of pre-allocated output buffer to hold the output.
char * out pre-allocated buffer to hold the generated data.
Applies the TLS Pseudo-Random-Function (PRF) on the master secret and
the provided data, seeded with the client and server random fields, as
specified in RFC5705.
The label variable usually contains a string denoting the purpose for
the generated data. The server_random_first indicates whether the
client random field or the server random field should be first in the
seed. Non-0 indicates that the server random field is first, 0 that
the client random field is first.
The extra 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
The output is placed in out , which must be pre-allocated.
GNUTLS_E_SUCCESS on success, or an error code.
gnutls 3.2.11 gnutls_prf(3)