NAME

       EVP_chacha20, EVP_chacha20_poly1305 - EVP ChaCha20 stream cipher

SYNOPSIS

        #include <openssl/evp.h>

        const EVP_CIPHER *EVP_chacha20(void)
        const EVP_CIPHER *EVP_chacha20_poly1305(void)

DESCRIPTION

       The ChaCha20 stream cipher for EVP.

       EVP_chacha20()
           The ChaCha20 stream cipher. The key length is 256 bits, the IV is 96 bits long.

       EVP_chacha20_poly1305()
           Authenticated  encryption with ChaCha20-Poly1305. Like EVP_chacha20(), the key is 256 bits and the IV
           is 96 bits. This supports additional authenticated data (AAD) and produces a  128-bit  authentication
           tag. See the "AEAD Interface" in EVP_EncryptInit(3) section for more 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 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
       <https://www.openssl.org/source/license.html>.

1.1.1                                              2023-05-24                                 EVP_CHACHA20(3SSL)