vendor/golang.org/x/crypto/sha3/shake.go

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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package sha3

// This file defines the ShakeHash interface, and provides
// functions for creating SHAKE and cSHAKE instances, as well as utility
// functions for hashing bytes to arbitrary-length output.
//
//
// SHAKE implementation is based on FIPS PUB 202 [1]
// cSHAKE implementations is based on NIST SP 800-185 [2]
//
// [1] https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf
// [2] https://doi.org/10.6028/NIST.SP.800-185

import (
	"encoding/binary"
	"io"
)

// ShakeHash defines the interface to hash functions that
// support arbitrary-length output.
type ShakeHash interface {
	// Write absorbs more data into the hash's state. It panics if input is
	// written to it after output has been read from it.
	io.Writer

	// Read reads more output from the hash; reading affects the hash's
	// state. (ShakeHash.Read is thus very different from Hash.Sum)
	// It never returns an error.
	io.Reader

	// Clone returns a copy of the ShakeHash in its current state.
	Clone() ShakeHash

	// Reset resets the ShakeHash to its initial state.
	Reset()
}

// cSHAKE specific context
type cshakeState struct {
	*state // SHA-3 state context and Read/Write operations

	// initBlock is the cSHAKE specific initialization set of bytes. It is initialized
	// by newCShake function and stores concatenation of N followed by S, encoded
	// by the method specified in 3.3 of [1].
	// It is stored here in order for Reset() to be able to put context into
	// initial state.
	initBlock []byte
}

// Consts for configuring initial SHA-3 state
const (
	dsbyteShake  = 0x1f
	dsbyteCShake = 0x04
	rate128      = 168
	rate256      = 136
)