[#RC4_set_key]
= RC4_set_key
:mrdocs:

Initialize an RC4_KEY from a variable‐length key (deprecated; prefer EVP_CIPHER).

== Synopsis

Declared in `<openssl/rc4.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
void
RC4_set_key(
    xref:RC4_KEY.adoc[RC4_KEY]* key,
    int len,
    unsigned char const* data);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| RC4 key schedule to initialize.
| *len*
| Length of `data` in bytes.
| *data*
| Key material used to set up the RC4 permutation.
|===


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