[#EVP_PKEY_CTX_hex2ctrl]
= EVP_PKEY_CTX_hex2ctrl
:mrdocs:

Decode a hex string to bytes and pass them to EVP_PKEY_CTX_ctrl as the p2 buffer.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_hex2ctrl(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    int cmd,
    char const* hex);
----

== 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.
| *hex*
| NUL‐terminated hexadecimal encoding of the binary value.
|===


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