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EVP_CHACHA20(3)                     OpenSSL                    EVP_CHACHA20(3)

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 128 bits long. The first 32 bits consists of a counter in little- endian order followed by a 96 bit nonce. For example a nonce of: 000000000000000000000002 With an initial counter of 42 (2a in hex) would be expressed as: 2a000000000000000000000000000002 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 2017-2019 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>. 1.1.1p 2022-06-21 EVP_CHACHA20(3)

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