[#EVP_PKEY_CTX_get1_id]
= EVP_PKEY_CTX_get1_id
:mrdocs:

Copy the algorithm‐specific ID bytes from `ctx` into `id.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_get1_id(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    void* id);
----

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context that previously received an ID via EVP_PKEY_CTX_set1_id().
| *id*
| Caller‐allocated buffer of size reported by EVP_PKEY_CTX_get1_id_len().
|===


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