\" $NetBSD: SHAKE.3,v 1.1 2017/11/30 16:00:48 wiz Exp $
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\" Copyright (c) 2015 Taylor R. Campbell
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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 [email protected]

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