forked from gochain/gochain
-
Notifications
You must be signed in to change notification settings - Fork 0
/
hashes.go
106 lines (89 loc) · 3.37 KB
/
hashes.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
// 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 provides functions for creating instances of the SHA-3
// and SHAKE hash functions, as well as utility functions for hashing
// bytes.
import (
"hash"
)
// NewKeccak256 creates a new Keccak-256 hash.
func NewKeccak256() hash.Hash { return &state{rate: 136, outputLen: 32, dsbyte: 0x01} }
// NewKeccak256SingleSum is like NewKeccak256, but the returned hash must be
// Reset() after calling Sum(). This allows skipping an internal state copy.
func NewKeccak256SingleSum() hash.Hash {
return &singleSumState{state{rate: 136, outputLen: 32, dsbyte: 0x01}}
}
// Keccak256 is optimized for cases that call Sum() just once. When h is 32
// bytes it is equivalent to calling NewKeccak256() and using the Write() and
// Sum() hash.Hash interface methods, but avoids the extra allocations in
// (*state).Sum(), which copies the internal state for continued use. This copy
// is unnecessary when the hash.Hash is discarded after calling Sum().
func Keccak256(h []byte, data ...[]byte) {
s := &state{rate: 136, outputLen: 32, dsbyte: 0x01}
for _, b := range data {
s.Write(b)
}
s.Read(h)
}
// NewKeccak512 creates a new Keccak-512 hash.
func NewKeccak512() hash.Hash { return &state{rate: 72, outputLen: 64, dsbyte: 0x01} }
// NewKeccak512SingleSum returns an optimized instance, like NewKeccak256SingleSum().
func NewKeccak512SingleSum() hash.Hash {
return &singleSumState{state{rate: 72, outputLen: 64, dsbyte: 0x01}}
}
// Keccack512 is an optimized alternative to NewKeccak512/Write/Sum, like Keccack256.
func Keccak512(data ...[]byte) []byte {
var h [64]byte
s := &state{rate: 72, outputLen: 64, dsbyte: 0x01}
for _, b := range data {
s.Write(b)
}
s.Read(h[:])
return h[:]
}
// New224 creates a new SHA3-224 hash.
// Its generic security strength is 224 bits against preimage attacks,
// and 112 bits against collision attacks.
func New224() hash.Hash { return &state{rate: 144, outputLen: 28, dsbyte: 0x06} }
// New256 creates a new SHA3-256 hash.
// Its generic security strength is 256 bits against preimage attacks,
// and 128 bits against collision attacks.
func New256() hash.Hash { return &state{rate: 136, outputLen: 32, dsbyte: 0x06} }
// New384 creates a new SHA3-384 hash.
// Its generic security strength is 384 bits against preimage attacks,
// and 192 bits against collision attacks.
func New384() hash.Hash { return &state{rate: 104, outputLen: 48, dsbyte: 0x06} }
// New512 creates a new SHA3-512 hash.
// Its generic security strength is 512 bits against preimage attacks,
// and 256 bits against collision attacks.
func New512() hash.Hash { return &state{rate: 72, outputLen: 64, dsbyte: 0x06} }
// Sum224 returns the SHA3-224 digest of the data.
func Sum224(data []byte) (digest [28]byte) {
h := New224()
h.Write(data)
h.Sum(digest[:0])
return
}
// Sum256 returns the SHA3-256 digest of the data.
func Sum256(data []byte) (digest [32]byte) {
h := New256()
h.Write(data)
h.Sum(digest[:0])
return
}
// Sum384 returns the SHA3-384 digest of the data.
func Sum384(data []byte) (digest [48]byte) {
h := New384()
h.Write(data)
h.Sum(digest[:0])
return
}
// Sum512 returns the SHA3-512 digest of the data.
func Sum512(data []byte) (digest [64]byte) {
h := New512()
h.Write(data)
h.Sum(digest[:0])
return
}