Péter Szilágyi
ff983b9c42
Keccak uses a different domain separation byte as the NIST- standardized SHA-3 hashing function. A previous commit to this package added support for Keccak-256, but did not do so for Keccak-512. The reasoning was to support use cases like Ethereum, however Ethereum also uses Keccak-512 for the Ethash PoW, so this second method is also needed. Prev CL: https://go-review.googlesource.com/c/crypto/+/106462 Fixes golang/go#29533 Change-Id: I9d92b1f121657f631c157e5e309771db1cd91c82 Reviewed-on: https://go-review.googlesource.com/c/125795 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
98 lines
2.7 KiB
Go
98 lines
2.7 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 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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// New224 creates a new SHA3-224 hash.
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// Its generic security strength is 224 bits against preimage attacks,
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// and 112 bits against collision attacks.
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func New224() hash.Hash {
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if h := new224Asm(); h != nil {
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return h
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}
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return &state{rate: 144, outputLen: 28, dsbyte: 0x06}
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}
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// New256 creates a new SHA3-256 hash.
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// Its generic security strength is 256 bits against preimage attacks,
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// and 128 bits against collision attacks.
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func New256() hash.Hash {
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if h := new256Asm(); h != nil {
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return h
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}
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return &state{rate: 136, outputLen: 32, dsbyte: 0x06}
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}
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// New384 creates a new SHA3-384 hash.
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// Its generic security strength is 384 bits against preimage attacks,
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// and 192 bits against collision attacks.
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func New384() hash.Hash {
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if h := new384Asm(); h != nil {
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return h
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}
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return &state{rate: 104, outputLen: 48, dsbyte: 0x06}
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}
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// New512 creates a new SHA3-512 hash.
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// Its generic security strength is 512 bits against preimage attacks,
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// and 256 bits against collision attacks.
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func New512() hash.Hash {
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if h := new512Asm(); h != nil {
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return h
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}
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return &state{rate: 72, outputLen: 64, dsbyte: 0x06}
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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 { return &state{rate: 136, outputLen: 32, dsbyte: 0x01} }
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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 { return &state{rate: 72, outputLen: 64, dsbyte: 0x01} }
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// Sum224 returns the SHA3-224 digest of the data.
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func Sum224(data []byte) (digest [28]byte) {
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h := New224()
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h.Write(data)
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h.Sum(digest[:0])
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return
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}
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// Sum256 returns the SHA3-256 digest of the data.
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func Sum256(data []byte) (digest [32]byte) {
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h := New256()
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h.Write(data)
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h.Sum(digest[:0])
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return
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}
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// Sum384 returns the SHA3-384 digest of the data.
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func Sum384(data []byte) (digest [48]byte) {
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h := New384()
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h.Write(data)
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h.Sum(digest[:0])
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return
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}
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// Sum512 returns the SHA3-512 digest of the data.
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func Sum512(data []byte) (digest [64]byte) {
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h := New512()
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h.Write(data)
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h.Sum(digest[:0])
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return
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}
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