[#EVP_PKEY_CTX_set_tls1_prf_md]
= EVP_PKEY_CTX_set_tls1_prf_md
:mrdocs:

Select the digest used by a TLS1‐PRF EVP_PKEY_CTX.

== Synopsis

Declared in `<openssl/kdf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set_tls1_prf_md(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    xref:EVP_MD.adoc[EVP_MD] const* md);
----

== Return Value

1 on success, or a negative value / 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context for EVP_PKEY_TLS1_PRF key derivation.
| *md*
| Message digest (for example EVP_sha256()) used by the PRF.
|===


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