1EVP_CHACHA20(3)                     OpenSSL                    EVP_CHACHA20(3)
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NAME

6       EVP_chacha20, EVP_chacha20_poly1305 - EVP ChaCha20 stream cipher
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SYNOPSIS

9        #include <openssl/evp.h>
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11        const EVP_CIPHER *EVP_chacha20(void)
12        const EVP_CIPHER *EVP_chacha20_poly1305(void)
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DESCRIPTION

15       The ChaCha20 stream cipher for EVP.
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17       EVP_chacha20()
18           The ChaCha20 stream cipher. The key length is 256 bits, the IV is
19           128 bits long.  The first 32 bits consists of a counter in little-
20           endian order followed by a 96 bit nonce. For example a nonce of:
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22           000000000000000000000002
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24           With an initial counter of 42 (2a in hex) would be expressed as:
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26           2a000000000000000000000000000002
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28       EVP_chacha20_poly1305()
29           Authenticated encryption with ChaCha20-Poly1305. Like
30           EVP_chacha20(), the key is 256 bits and the IV is 96 bits. This
31           supports additional authenticated data (AAD) and produces a 128-bit
32           authentication tag. See the "AEAD Interface" in EVP_EncryptInit(3)
33           section for more information.
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RETURN VALUES

36       These functions return an EVP_CIPHER structure that contains the
37       implementation of the symmetric cipher. See EVP_CIPHER_meth_new(3) for
38       details of the EVP_CIPHER structure.
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SEE ALSO

41       evp(7), EVP_EncryptInit(3), EVP_CIPHER_meth_new(3)
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44       Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
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46       Licensed under the OpenSSL license (the "License").  You may not use
47       this file except in compliance with the License.  You can obtain a copy
48       in the file LICENSE in the source distribution or at
49       <https://www.openssl.org/source/license.html>.
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531.1.1q                            2022-07-07                   EVP_CHACHA20(3)
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