[#EVP_PKEY_CTX_set1_id]
= EVP_PKEY_CTX_set1_id
:mrdocs:

Set an algorithm‐specific identity value on a key operation context (copied).

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set1_id(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    void const* id,
    int len);
----

== Return Value

1 on success, or a non‐positive value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context that supports an ID parameter (for example SM2).
| *id*
| Identity bytes to copy into the context.
| *len*
| Length of `id` in bytes.
|===


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