[#EVP_CIPHER_CTX_ctrl]
= EVP_CIPHER_CTX_ctrl
:mrdocs:

Send a cipher‐specific control request to an EVP_CIPHER_CTX.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_CIPHER_CTX_ctrl(
    xref:EVP_CIPHER_CTX.adoc[EVP_CIPHER_CTX]* ctx,
    int type,
    int arg,
    void* ptr);
----

== Return Value

1 on success, <=0 on failure (command‐specific).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Cipher context to control.
| *type*
| EVP_CTRL_* command code.
| *arg*
| Integer argument for `type.`
| *ptr*
| Pointer argument for `type,` or NULL.
|===


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