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//opt/alt/openssl11/share/man/man3/EVP_chacha20_poly1305.3ssl
.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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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 "\fIEVP_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 "\fIEVP_chacha20_poly1305()\fR" 4 .IX Item "EVP_chacha20_poly1305()" Authenticated encryption with ChaCha20\-Poly1305. Like \fIEVP_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 \fIEVP_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 \fIEVP_CIPHER_meth_new\fR\|(3) for details of the \fB\s-1EVP_CIPHER\s0\fR structure. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIevp\fR\|(7), \&\fIEVP_EncryptInit\fR\|(3), \&\fIEVP_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>.
