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8e1de223ad
The upstream libray has removed the assembly-based implementation of keccak. We need to maintain our own library to avoid a peformance regression. --------- Co-authored-by: lightclient <lightclient@protonmail.com>
44 lines
1.4 KiB
Go
44 lines
1.4 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 keccak
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// This file provides functions for creating instances of the SHA-3
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// and SHAKE hash functions, as well as utility functions for hashing
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// bytes.
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import (
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"hash"
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)
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const (
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dsbyteSHA3 = 0b00000110
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dsbyteKeccak = 0b00000001
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dsbyteShake = 0b00011111
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dsbyteCShake = 0b00000100
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// rateK[c] is the rate in bytes for Keccak[c] where c is the capacity in
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// bits. Given the sponge size is 1600 bits, the rate is 1600 - c bits.
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rateK256 = (1600 - 256) / 8
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rateK448 = (1600 - 448) / 8
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rateK512 = (1600 - 512) / 8
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rateK768 = (1600 - 768) / 8
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rateK1024 = (1600 - 1024) / 8
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)
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// NewLegacyKeccak256 creates a new Keccak-256 hash.
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//
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// Only use this function if you require compatibility with an existing cryptosystem
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// that uses non-standard padding. All other users should use New256 instead.
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func NewLegacyKeccak256() hash.Hash {
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return &state{rate: rateK512, outputLen: 32, dsbyte: dsbyteKeccak}
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}
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// NewLegacyKeccak512 creates a new Keccak-512 hash.
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//
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// Only use this function if you require compatibility with an existing cryptosystem
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// that uses non-standard padding. All other users should use New512 instead.
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func NewLegacyKeccak512() hash.Hash {
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return &state{rate: rateK1024, outputLen: 64, dsbyte: dsbyteKeccak}
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}
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