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Current File : /www/server/nginx/src/openssl/doc/man3/EVP_chacha20.pod
=pod

=head1 NAME

EVP_chacha20,
EVP_chacha20_poly1305
- EVP ChaCha20 stream cipher

=head1 SYNOPSIS

 #include <openssl/evp.h>

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

=head1 DESCRIPTION

The ChaCha20 stream cipher for EVP.

=over 4

=item EVP_chacha20()

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

=item 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
L<EVP_EncryptInit(3)/AEAD Interface> section for more information.

=back

=head1 RETURN VALUES

These functions return an B<EVP_CIPHER> structure that contains the
implementation of the symmetric cipher. See L<EVP_CIPHER_meth_new(3)> for
details of the B<EVP_CIPHER> structure.

=head1 SEE ALSO

L<evp(7)>,
L<EVP_EncryptInit(3)>,
L<EVP_CIPHER_meth_new(3)>

=head1 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
L<https://www.openssl.org/source/license.html>.

=cut

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