[#SSL_export_keying_material]
= SSL_export_keying_material
:mrdocs:

Export keying material derived from the connection's exporter secret.

== Synopsis

Declared in `<openssl/tls1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL_export_keying_material(
    xref:SSL.adoc[SSL]* s,
    unsigned char* out,
    size_t olen,
    char const* label,
    size_t llen,
    unsigned char const* context,
    size_t contextlen,
    int use_context);
----

== Return Value

1 on success, or 0 or ‐1 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| SSL connection to export from.
| *out*
| Buffer that receives `olen` bytes of keying material.
| *olen*
| Number of bytes to write to `out.`
| *label*
| Application‐specific label.
| *llen*
| Length of `label` in bytes.
| *context*
| Optional application context bytes.
| *contextlen*
| Length of `context` in bytes.
| *use_context*
| Nonzero to include `context;` zero to omit it.
|===


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