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.\" ========================================================================
.\"
.IX Title "EVP_RC4 3"
.TH EVP_RC4 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
EVP_rc4, EVP_rc4_40, EVP_rc4_hmac_md5 \&\- EVP RC4 stream cipher
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& const EVP_CIPHER *EVP_rc4(void)
\& const EVP_CIPHER *EVP_rc4_40(void)
\& const EVP_CIPHER *EVP_rc4_hmac_md5(void)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \s-1RC4\s0 stream cipher for \s-1EVP.\s0
.IP "\fIEVP_rc4()\fR" 4
.IX Item "EVP_rc4()"
\&\s-1RC4\s0 stream cipher. This is a variable key length cipher with a default key
length of 128 bits.
.IP "\fIEVP_rc4_40()\fR" 4
.IX Item "EVP_rc4_40()"
\&\s-1RC4\s0 stream cipher with 40 bit key length.
.Sp
\&\s-1WARNING:\s0 this function is obsolete. Its usage should be replaced with the
\&\fIEVP_rc4()\fR and the \fIEVP_CIPHER_CTX_set_key_length()\fR functions.
.IP "\fIEVP_rc4_hmac_md5()\fR" 4
.IX Item "EVP_rc4_hmac_md5()"
Authenticated encryption with the \s-1RC4\s0 stream cipher with \s-1MD5\s0 as \s-1HMAC.\s0
.Sp
\&\s-1WARNING:\s0 this is not intended for usage outside of \s-1TLS\s0 and requires calling of
some undocumented ctrl functions. These ciphers do not conform to the \s-1EVP AEAD\s0
interface.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions return an \fB\s-1EVP_CIPHER\s0\fR structure that contains the
implementation of the symmetric cipher. See \fIEVP_CIPHER_meth_new\fR\|(3) for
details of the \fB\s-1EVP_CIPHER\s0\fR structure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIevp\fR\|(7),
\&\fIEVP_EncryptInit\fR\|(3),
\&\fIEVP_CIPHER_meth_new\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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