1=pod 2 3=head1 NAME 4 5EVP_chacha20, 6EVP_chacha20_poly1305 7- EVP ChaCha20 stream cipher 8 9=head1 SYNOPSIS 10 11 #include <openssl/evp.h> 12 13 const EVP_CIPHER *EVP_chacha20(void) 14 const EVP_CIPHER *EVP_chacha20_poly1305(void) 15 16=head1 DESCRIPTION 17 18The ChaCha20 stream cipher for EVP. 19 20=over 4 21 22=item EVP_chacha20() 23 24The ChaCha20 stream cipher. The key length is 256 bits, the IV is 96 bits long. 25 26=item EVP_chacha20_poly1305() 27 28Authenticated encryption with ChaCha20-Poly1305. Like EVP_chacha20(), the key 29is 256 bits and the IV is 96 bits. This supports additional authenticated data 30(AAD) and produces a 128-bit authentication tag. See the 31L<EVP_EncryptInit(3)/AEAD Interface> section for more information. 32 33=back 34 35=head1 RETURN VALUES 36 37These functions return an B<EVP_CIPHER> structure that contains the 38implementation of the symmetric cipher. See L<EVP_CIPHER_meth_new(3)> for 39details of the B<EVP_CIPHER> structure. 40 41=head1 SEE ALSO 42 43L<evp(7)>, 44L<EVP_EncryptInit(3)>, 45L<EVP_CIPHER_meth_new(3)> 46 47=head1 COPYRIGHT 48 49Copyright 2017 The OpenSSL Project Authors. All Rights Reserved. 50 51Licensed under the OpenSSL license (the "License"). You may not use 52this file except in compliance with the License. You can obtain a copy 53in the file LICENSE in the source distribution or at 54L<https://www.openssl.org/source/license.html>. 55 56=cut 57 58