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 RETURN VALUES
These functions return an EVP_CIPHER structure that contains the implementation of the symmetric cipher. See SEE ALSO
EVP_EncryptInit(3), 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 https://www.openssl.org/source/license.html.