[#EVP_MD_CTX_ctrl]
= EVP_MD_CTX_ctrl
:mrdocs:

Send a legacy control request to a digest context.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_MD_CTX_ctrl(
    xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* ctx,
    int cmd,
    int p1,
    void* p2);
----

== Return Value

1 on success, or a command‐specific status / 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest context to control.
| *cmd*
| Control command (algorithm‐specific).
| *p1*
| Integer control argument.
| *p2*
| Pointer control argument, or NULL.
|===


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