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Editing: EVP_chacha20.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" EVP_chacha20, EVP_chacha20_poly1305 \&\- EVP ChaCha20 stream cipher .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/evp.h> \& \& const EVP_CIPHER *EVP_chacha20(void) \& const EVP_CIPHER *EVP_chacha20_poly1305(void) .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The ChaCha20 stream cipher for \s-1EVP.\s0 .IP "\fBEVP_chacha20()\fR" 4 .IX Item "EVP_chacha20()" The ChaCha20 stream cipher. The key length is 256 bits, the \s-1IV\s0 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: .Sp 000000000000000000000002 .Sp With an initial counter of 42 (2a in hex) would be expressed as: .Sp 2a000000000000000000000000000002 .IP "\fBEVP_chacha20_poly1305()\fR" 4 .IX Item "EVP_chacha20_poly1305()" Authenticated encryption with ChaCha20\-Poly1305. Like \fBEVP_chacha20()\fR, the key is 256 bits and the \s-1IV\s0 is 96 bits. This supports additional authenticated data (\s-1AAD\s0) and produces a 128\-bit authentication tag. See the \&\*(L"\s-1AEAD\s0 Interface\*(R" in \fBEVP_EncryptInit\fR\|(3) section for more information. .SH "RETURN VALUES" .IX Header "RETURN VALUES" These functions return an \fB\s-1EVP_CIPHER\s0\fR structure that contains the implementation of the symmetric cipher. See \fBEVP_CIPHER_meth_new\fR\|(3) for details of the \fB\s-1EVP_CIPHER\s0\fR structure. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBevp\fR\|(7), \&\fBEVP_EncryptInit\fR\|(3), \&\fBEVP_CIPHER_meth_new\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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