EVP_rc4, EVP_rc4_40, EVP_rc4_hmac_md5 - EVP RC4 stream cipher
 #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);
The RC4 stream cipher for EVP.
  - EVP_rc4()
- RC4 stream cipher. This is a variable key length cipher with a default key
      length of 128 bits.
- 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    WARNING: this function is obsolete.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. 
- 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. 
Developers should be aware of the negative performance implications of calling
  these functions multiple times and should consider using
  EVP_CIPHER_fetch(3) with EVP_CIPHER-RC4(7) instead. See
  "Performance" in crypto(7) for further information.
These functions return an EVP_CIPHER structure that contains the
  implementation of the symmetric cipher. See EVP_CIPHER_meth_new(3) for
  details of the EVP_CIPHER structure.
evp(7), EVP_EncryptInit(3), EVP_CIPHER_meth_new(3)
Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.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>.