[#EVP_PKEY_set_octet_string_param]
= EVP_PKEY_set_octet_string_param
:mrdocs:

Set a named octet‐string parameter on an EVP_PKEY.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_set_octet_string_param(
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey,
    char const* key_name,
    unsigned char const* buf,
    size_t bsize);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pkey*
| Key to update.
| *key_name*
| Parameter name understood by the key type (OSSL_PKEY_PARAM_*).
| *buf*
| Octet string value to assign (copied).
| *bsize*
| Length of `buf` in bytes.
|===


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