[#EVP_PKEY_CTX_str2ctrl]
= EVP_PKEY_CTX_str2ctrl
:mrdocs:

Pass a NUL‐terminated string to EVP_PKEY_CTX_ctrl as the p2 argument.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_str2ctrl(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    int cmd,
    char const* str);
----

== Return Value

Positive on success, 0 or negative on failure (same convention as EVP_PKEY_CTX_ctrl).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context that receives the control.
| *cmd*
| Control command number understood by the key method.
| *str*
| NUL‐terminated string passed as `p2` (length is strlen(`str)).`
|===


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