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+.\" $NetBSD: SHAKE.3,v 1.1 2017/11/30 16:00:48 wiz Exp $
+.\"
+.\" Copyright (c) 2015 Taylor R. Campbell
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd October 14, 2015
+.Dt SHAKE 3
+.Os
+.Sh NAME
+.Nm SHAKE
+.Nd NIST FIPS PUB 202: SHA-3 Standard: Permutation-Based Hash and Extendable-Output Functions
+.Sh SYNOPSIS
+.In sha3.h
+.Ft void
+.Fn SHAKE128_Init "SHAKE128_CTX *ctx"
+.Ft void
+.Fn SHAKE128_Update "SHAKE128_CTX *ctx" "const uint8_t *buf" "size_t len"
+.Ft void
+.Fn SHAKE128_Final "uint8_t *output[]" "size_t outlen" "SHAKE128_CTX *ctx"
+.Ft void
+.Fn SHAKE256_Init "SHAKE256_CTX *ctx"
+.Ft void
+.Fn SHAKE256_Update "SHAKE256_CTX *ctx" "const uint8_t *buf" "size_t len"
+.Ft void
+.Fn SHAKE256_Final "uint8_t *output[]" "size_t outlen" "SHAKE256_CTX *ctx"
+.Sh DESCRIPTION
+The
+.Nm
+functions implement the extendable-output functions of the NIST SHA-3
+standard, FIPS PUB 202.
+The
+.Nm
+functions absorb an arbitrary-length message m and yield an
+arbitrary-length output SHAKE128(m) or SHAKE256(m), truncated to a
+specified number of octets.
+.Pp
+Before using the
+.Nm
+functions, applications should first call
+.Xr SHA3_Selftest 3
+and confirm that it succeeded.
+.Pp
+Only the
+.Nm SHAKE128
+functions are specified in detail; the
+.Nm SHAKE256
+functions are analogous.
+.Pp
+The caller must allocate memory for a
+.Vt SHAKE128_CTX
+object to hold the state of a SHAKE128 computation over a message.
+.Vt SHAKE128_CTX
+objects may be copied or relocated in memory.
+.Bl -tag -width abcd
+.It Fn SHAKE128_Init "ctx"
+Initialize a SHAKE128 context.
+Must be done before any other operations on
+.Fa ctx .
+.It Fn SHAKE128_Update "ctx" "data" "len"
+Append
+.Fa len
+octets at
+.Fa data
+to the message.
+.It Fn SHAKE128_Final "output" "outlen" "ctx"
+Store at
+.Fa output
+the first
+.Fa outlen
+octets of the SHAKE128 output for the message obtained by concatenating
+all prior inputs to
+.Fn SHAKE128_Update
+on
+.Fa ctx .
+.Pp
+Subsequent use of
+.Fa ctx
+is not allowed, unless it is reinitialized with
+.Fn SHAKE128_Init .
+.El
+.Sh SEE ALSO
+.Xr keccak 3 ,
+.Xr sha3 3 ,
+.Xr SHA3_Selftest 3
+.Sh STANDARDS
+.Rs
+.%A National Institute of Standards and Technology
+.%T SHA-3 Standard: Permutation-Based Hash and Extendable-Output Functions
+.%O FIPS PUB 202
+.%D August 2015
+.Re
+.Sh AUTHORS
+.An Taylor R Campbell Aq campbell+sha3@mumble.net