EVP_rc4, EVP_rc4_40, EVP_rc4_hmac_md5 - EVP RC4 stream cipher

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       Licensed under the Apache License 2.0 (the "License").  You may not use this file  except  in  compliance
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       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                                      EVP_RC4(3SSL)

       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           WARNING:  this  function  is  obsolete.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.

       EVP_rc4, EVP_rc4_40, EVP_rc4_hmac_md5 - EVP RC4 stream cipher

       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)

        #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);