[#EVP_PKEY_get_size]
= EVP_PKEY_get_size
:mrdocs:

Return the maximum signature or related output size for a key in bytes.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_get_size(xref:EVP_PKEY.adoc[EVP_PKEY] const* pkey);
----

== Return Value

Maximum size in bytes suitable for allocating signature buffers, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pkey*
| Key to query (for example RSA or EC).
|===


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