-
Notifications
You must be signed in to change notification settings - Fork 459
/
params.go
136 lines (120 loc) · 4.39 KB
/
params.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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
// Copyright (c) 2013 Kyle Isom <kyle@tyrfingr.is>
// Copyright (c) 2012 The Go Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package ecies
// This file contains parameters for ECIES encryption, specifying the
// symmetric encryption and HMAC parameters.
import (
"crypto"
"crypto/aes"
"crypto/cipher"
"crypto/elliptic"
"crypto/sha256"
"crypto/sha512"
"fmt"
"hash"
ethcrypto "github.com/dominant-strategies/go-quai/crypto"
)
var (
DefaultCurve = ethcrypto.S256()
ErrUnsupportedECDHAlgorithm = fmt.Errorf("ecies: unsupported ECDH algorithm")
ErrUnsupportedECIESParameters = fmt.Errorf("ecies: unsupported ECIES parameters")
ErrInvalidKeyLen = fmt.Errorf("ecies: invalid key size (> %d) in ECIESParams", maxKeyLen)
)
// KeyLen is limited to prevent overflow of the counter
// in concatKDF. While the theoretical limit is much higher,
// no known cipher uses keys larger than 512 bytes.
const maxKeyLen = 512
type ECIESParams struct {
Hash func() hash.Hash // hash function
hashAlgo crypto.Hash
Cipher func([]byte) (cipher.Block, error) // symmetric cipher
BlockSize int // block size of symmetric cipher
KeyLen int // length of symmetric key
}
// Standard ECIES parameters:
// * ECIES using AES128 and HMAC-SHA-256-16
// * ECIES using AES256 and HMAC-SHA-256-32
// * ECIES using AES256 and HMAC-SHA-384-48
// * ECIES using AES256 and HMAC-SHA-512-64
var (
ECIES_AES128_SHA256 = &ECIESParams{
Hash: sha256.New,
hashAlgo: crypto.SHA256,
Cipher: aes.NewCipher,
BlockSize: aes.BlockSize,
KeyLen: 16,
}
ECIES_AES256_SHA256 = &ECIESParams{
Hash: sha256.New,
hashAlgo: crypto.SHA256,
Cipher: aes.NewCipher,
BlockSize: aes.BlockSize,
KeyLen: 32,
}
ECIES_AES256_SHA384 = &ECIESParams{
Hash: sha512.New384,
hashAlgo: crypto.SHA384,
Cipher: aes.NewCipher,
BlockSize: aes.BlockSize,
KeyLen: 32,
}
ECIES_AES256_SHA512 = &ECIESParams{
Hash: sha512.New,
hashAlgo: crypto.SHA512,
Cipher: aes.NewCipher,
BlockSize: aes.BlockSize,
KeyLen: 32,
}
)
var paramsFromCurve = map[elliptic.Curve]*ECIESParams{
ethcrypto.S256(): ECIES_AES128_SHA256,
elliptic.P256(): ECIES_AES128_SHA256,
elliptic.P384(): ECIES_AES256_SHA384,
elliptic.P521(): ECIES_AES256_SHA512,
}
func AddParamsForCurve(curve elliptic.Curve, params *ECIESParams) {
paramsFromCurve[curve] = params
}
// ParamsFromCurve selects parameters optimal for the selected elliptic curve.
// Only the curves P256, P384, and P512 are supported.
func ParamsFromCurve(curve elliptic.Curve) (params *ECIESParams) {
return paramsFromCurve[curve]
}
func pubkeyParams(key *PublicKey) (*ECIESParams, error) {
params := key.Params
if params == nil {
if params = ParamsFromCurve(key.Curve); params == nil {
return nil, ErrUnsupportedECIESParameters
}
}
if params.KeyLen > maxKeyLen {
return nil, ErrInvalidKeyLen
}
return params, nil
}