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           96 bits long.
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21       EVP_chacha20_poly1305()
22           Authenticated encryption with ChaCha20-Poly1305. Like
23           EVP_chacha20(), the key is 256 bits and the IV is 96 bits. This
24           supports additional authenticated data (AAD) and produces a 128-bit
25           authentication tag. See the "AEAD Interface" in EVP_EncryptInit(3)
26           section for more information.
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RETURN VALUES

29       These functions return an EVP_CIPHER structure that contains the
30       implementation of the symmetric cipher. See EVP_CIPHER_meth_new(3) for
31       details of the EVP_CIPHER structure.
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SEE ALSO

34       evp(7), EVP_EncryptInit(3), EVP_CIPHER_meth_new(3)
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37       Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
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39       Licensed under the OpenSSL license (the "License").  You may not use
40       this file except in compliance with the License.  You can obtain a copy
41       in the file LICENSE in the source distribution or at
42       <https://www.openssl.org/source/license.html>.
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461.1.1                             2018-09-11                   EVP_CHACHA20(3)
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