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.\" ========================================================================
.\"
.IX Title "EVP_RC4 3ssl"
.TH EVP_RC4 3ssl 2024-10-23 3.4.0 OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.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 RC4 stream cipher for EVP.
.IP \fBEVP_rc4()\fR 4
.IX Item "EVP_rc4()"
RC4 stream cipher. This is a variable key length cipher with a default key
length of 128 bits.
.IP \fBEVP_rc4_40()\fR 4
.IX Item "EVP_rc4_40()"
RC4 stream cipher with 40 bit key length.
.Sp
WARNING: this function is obsolete. Its usage should be replaced with the
\&\fBEVP_rc4()\fR and the \fBEVP_CIPHER_CTX_set_key_length()\fR functions.
.IP \fBEVP_rc4_hmac_md5()\fR 4
.IX Item "EVP_rc4_hmac_md5()"
Authenticated encryption with the RC4 stream cipher with MD5 as HMAC.
.Sp
WARNING: this is not intended for usage outside of TLS and requires calling of
some undocumented ctrl functions. These ciphers do not conform to the EVP AEAD
interface.
.SH NOTES
.IX Header "NOTES"
Developers should be aware of the negative performance implications of
calling these functions multiple times and should consider using
\&\fBEVP_CIPHER_fetch\fR\|(3) with \fBEVP_CIPHER\-RC4\fR\|(7) instead.
See "Performance" in \fBcrypto\fR\|(7) for further information.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
These functions return an \fBEVP_CIPHER\fR structure that contains the
implementation of the symmetric cipher. See \fBEVP_CIPHER_meth_new\fR\|(3) for
details of the \fBEVP_CIPHER\fR structure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBevp\fR\|(7),
\&\fBEVP_EncryptInit\fR\|(3),
\&\fBEVP_CIPHER_meth_new\fR\|(3)
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2017\-2023 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.