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EVP_CHACHA20(3)			    OpenSSL		       EVP_CHACHA20(3)

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 "AEAD Interface"	in EVP_EncryptInit(3)
	   section for more information.

RETURN VALUES
       These functions return an EVP_CIPHER structure that contains the
       implementation of the symmetric cipher. See EVP_CIPHER_meth_new(3) for
       details of the EVP_CIPHER structure.

SEE ALSO
       evp(7), EVP_EncryptInit(3), EVP_CIPHER_meth_new(3)

COPYRIGHT
       Copyright 2017-2019 The OpenSSL Project Authors.	All Rights Reserved.

       Licensed	under the OpenSSL license (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>.

1.1.1h				  2020-09-22		       EVP_CHACHA20(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | COPYRIGHT

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