1.\" $OpenBSD: EVP_rc4.3,v 1.1 2019/03/21 13:37:25 schwarze Exp $ 2.\" full merge up to: OpenSSL 8fa4d95e Oct 21 11:59:09 2017 +0900 3.\" 4.\" This file was written by Ronald Tse <ronald.tse@ribose.com> 5.\" Copyright (c) 2017 The OpenSSL Project. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in 16.\" the documentation and/or other materials provided with the 17.\" distribution. 18.\" 19.\" 3. All advertising materials mentioning features or use of this 20.\" software must display the following acknowledgment: 21.\" "This product includes software developed by the OpenSSL Project 22.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 23.\" 24.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25.\" endorse or promote products derived from this software without 26.\" prior written permission. For written permission, please contact 27.\" openssl-core@openssl.org. 28.\" 29.\" 5. Products derived from this software may not be called "OpenSSL" 30.\" nor may "OpenSSL" appear in their names without prior written 31.\" permission of the OpenSSL Project. 32.\" 33.\" 6. Redistributions of any form whatsoever must retain the following 34.\" acknowledgment: 35.\" "This product includes software developed by the OpenSSL Project 36.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)" 37.\" 38.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49.\" OF THE POSSIBILITY OF SUCH DAMAGE. 50.\" 51.Dd $Mdocdate: March 21 2019 $ 52.Dt EVP_RC4 3 53.Os 54.Sh NAME 55.Nm EVP_rc4 , 56.Nm EVP_rc4_40 , 57.Nm EVP_rc4_hmac_md5 58.Nd EVP RC4 stream cipher 59.Sh SYNOPSIS 60.In openssl/evp.h 61.Ft const EVP_CIPHER * 62.Fn EVP_rc4 void 63.Ft const EVP_CIPHER * 64.Fn EVP_rc4_40 void 65.Ft const EVP_CIPHER * 66.Fn EVP_rc4_hmac_md5 void 67.Sh DESCRIPTION 68These functions provide the RC4 stream cipher in the 69.Xr evp 3 70framework. 71It is a variable key length cipher. 72.Pp 73.Fn EVP_rc4 74uses a default key length of 128 bits. 75.Pp 76.Fn EVP_rc4_40 77uses a key length of 40 bits instead. 78This function is deprecated. 79Use 80.Fn EVP_rc4 81and 82.Xr EVP_CIPHER_CTX_set_key_length 3 83instead. 84.Pp 85.Fn EVP_rc4_hmac_md5 86provides authenticated encryption with the RC4 stream cipher 87with MD5 as HMAC. 88This function is not intended for usage outside of TLS 89and requires calling of some undocumented control functions. 90It does not conform to the EVP AEAD interface. 91.Sh RETURN VALUES 92These functions return an 93.Vt EVP_CIPHER 94structure that provides the implementation of the symmetric cipher. 95.Sh SEE ALSO 96.Xr evp 3 , 97.Xr EVP_EncryptInit 3 98.Sh HISTORY 99.Fn EVP_rc4 100first appeared in SSLeay 0.5.1 101and 102.Fn EVP_rc4_40 103in OpenSSL 0.9.1. 104These functions have been available since 105.Ox 2.4 . 106.Pp 107.Fn EVP_rc4_hmac_md5 108first appeared in OpenSSL 1.0.1 and has been available since 109.Ox 5.3 . 110