[#EVP_PKEY_CTX_add1_tls1_prf_seed]
= EVP&lowbar;PKEY&lowbar;CTX&lowbar;add1&lowbar;tls1&lowbar;prf&lowbar;seed
:mrdocs:

Append seed bytes to the TLS1&hyphen;PRF seed on a key context&period;

== Synopsis

Declared in `&lt;openssl&sol;kdf&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP&lowbar;PKEY&lowbar;CTX&lowbar;add1&lowbar;tls1&lowbar;prf&lowbar;seed(
    xref:EVP_PKEY_CTX.adoc[EVP&lowbar;PKEY&lowbar;CTX]* pctx,
    unsigned char const* seed,
    int seedlen);
----

== Return Value

1 on success, or 0 on failure&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pctx*
| Context configured for TLS1&hyphen;PRF&period;
| *seed*
| Additional seed octets to append (copied)&period;
| *seedlen*
| Length of `seed` in bytes&period;
|===


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