[#EVP_PKEY_CTX_ctrl_str]
= EVP_PKEY_CTX_ctrl_str
:mrdocs:

Send a named string control to a key context (for example "rsa_padding").

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_ctrl_str(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    char const* type,
    char const* value);
----

== Return Value

Positive on success, 0 or negative on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context receiving the control.
| *type*
| Control name understood by the algorithm.
| *value*
| Control value as a NUL‐terminated string, or NULL when unused.
|===


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