[#SSL_SESSION_set1_master_key]
= SSL_SESSION_set1_master_key
:mrdocs:

Set the master secret on an SSL session by copying `in.`

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL_SESSION_set1_master_key(
    xref:SSL_SESSION.adoc[SSL_SESSION]* sess,
    unsigned char const* in,
    size_t len);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *sess*
| Session whose master key is replaced.
| *in*
| Master secret octets.
| *len*
| Length of `in` in bytes (must be acceptable for the protocol).
|===


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