71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package sha3
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// This file defines the ShakeHash interface, and provides
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// functions for creating SHAKE instances, as well as utility
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// functions for hashing bytes to arbitrary-length output.
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import (
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"io"
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)
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// ShakeHash defines the interface to hash functions that
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// support arbitrary-length output.
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type ShakeHash interface {
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// Write absorbs more data into the hash's state. It panics if input is
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// written to it after output has been read from it.
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io.Writer
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// Read reads more output from the hash; reading affects the hash's
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// state. (ShakeHash.Read is thus very different from Hash.Sum)
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// It never returns an error.
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io.Reader
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// Clone returns a copy of the ShakeHash in its current state.
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Clone() ShakeHash
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// Reset resets the ShakeHash to its initial state.
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Reset()
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}
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func (d *state) Clone() ShakeHash {
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return d.clone()
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}
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// NewShake128 creates a new SHAKE128 variable-output-length ShakeHash.
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// Its generic security strength is 128 bits against all attacks if at
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// least 32 bytes of its output are used.
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func NewShake128() ShakeHash {
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if h := newShake128Asm(); h != nil {
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return h
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}
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return &state{rate: 168, dsbyte: 0x1f}
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}
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// NewShake256 creates a new SHAKE256 variable-output-length ShakeHash.
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// Its generic security strength is 256 bits against all attacks if
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// at least 64 bytes of its output are used.
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func NewShake256() ShakeHash {
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if h := newShake256Asm(); h != nil {
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return h
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}
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return &state{rate: 136, dsbyte: 0x1f}
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}
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// ShakeSum128 writes an arbitrary-length digest of data into hash.
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func ShakeSum128(hash, data []byte) {
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h := NewShake128()
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h.Write(data)
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h.Read(hash)
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}
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// ShakeSum256 writes an arbitrary-length digest of data into hash.
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func ShakeSum256(hash, data []byte) {
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h := NewShake256()
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h.Write(data)
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h.Read(hash)
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}
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