[#RC4]
= RC4
:mrdocs:

Encrypt or decrypt `len` bytes with RC4 (deprecated; prefer EVP_CIPHER).

== Synopsis

Declared in `<openssl/rc4.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
void
RC4(
    xref:RC4_KEY.adoc[RC4_KEY]* key,
    size_t len,
    unsigned char const* indata,
    unsigned char* outdata);
----

[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 previously set with RC4_set_key(); updated in place.
| *len*
| Number of bytes to process.
| *indata*
| Input plaintext or ciphertext.
| *outdata*
| Output buffer of at least `len` bytes (may alias `indata).`
|===


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