Updated: 2022/Sep/29

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EVP_rc4(3)                          OpenSSL                         EVP_rc4(3)



NAME
       EVP_rc4, EVP_rc4_40, EVP_rc4_hmac_md5 - EVP RC4 stream cipher

LIBRARY
       libcrypto, -lcrypto

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);

DESCRIPTION
       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           WARNING: this function is obsolete.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.

NOTES
       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.

RETURN VALUES
       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.

SEE ALSO
       evp(7), EVP_EncryptInit(3), EVP_CIPHER_meth_new(3)

COPYRIGHT
       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>.



3.0.12                            2023-10-25                        EVP_rc4(3)