=pod =head1 NAME EVP_rc4, EVP_rc4_40, EVP_rc4_hmac_md5 - EVP RC4 stream cipher =head1 SYNOPSIS #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) =head1 DESCRIPTION The RC4 stream cipher for EVP. =over 4 =item EVP_rc4() RC4 stream cipher. This is a variable key length cipher with a default key length of 128 bits. =item EVP_rc4_40() RC4 stream cipher with 40 bit key length. WARNING: this function is obsolete. Its usage should be replaced with the EVP_rc4() and the EVP_CIPHER_CTX_set_key_length() functions. =item EVP_rc4_hmac_md5() Authenticated encryption with the RC4 stream cipher with MD5 as HMAC. 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. =back =head1 RETURN VALUES These functions return an B<EVP_CIPHER> structure that contains the implementation of the symmetric cipher. See L<EVP_CIPHER_meth_new(3)> for details of the B<EVP_CIPHER> structure. =head1 SEE ALSO L<evp(7)>, L<EVP_EncryptInit(3)>, L<EVP_CIPHER_meth_new(3)> =head1 COPYRIGHT Copyright 2017 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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 L<https://www.openssl.org/source/license.html>. =cut