mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
6f3aae256d
Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8780)
66 lines
1.5 KiB
Plaintext
66 lines
1.5 KiB
Plaintext
=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 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
|
|
|
|
=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 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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|
|
|