[#EVP_PKEY_CTX_add1_tls1_prf_seed]
= EVP_PKEY_CTX_add1_tls1_prf_seed
:mrdocs:

Append seed bytes to the TLS1‐PRF seed on a key context.

== Synopsis

Declared in `<openssl/kdf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_add1_tls1_prf_seed(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* pctx,
    unsigned char const* seed,
    int seedlen);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

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


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