[#EVP_PKEY_CTX_get1_id_len]
= EVP_PKEY_CTX_get1_id_len
:mrdocs:

Return the length of an algorithm‐specific ID associated with a key context.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_get1_id_len(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    size_t* id_len);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context that holds an ID (for example SM2 user id).
| *id_len*
| Receives the ID length in bytes.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#