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
137
138
|
<?php
/**
* PuTTY Formatted EC Key Handler
*
* PHP version 5
*
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2015 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib3\Crypt\EC\Formats\Keys;
use phpseclib3\Common\Functions\Strings;
use phpseclib3\Crypt\Common\Formats\Keys\PuTTY as Progenitor;
use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
use phpseclib3\Math\BigInteger;
/**
* PuTTY Formatted EC Key Handler
*
* @author Jim Wigginton <terrafrost@php.net>
*/
abstract class PuTTY extends Progenitor
{
use Common;
/**
* Public Handler
*
* @var string
*/
const PUBLIC_HANDLER = 'phpseclib3\Crypt\EC\Formats\Keys\OpenSSH';
/**
* Supported Key Types
*
* @var array
*/
protected static $types = [
'ecdsa-sha2-nistp256',
'ecdsa-sha2-nistp384',
'ecdsa-sha2-nistp521',
'ssh-ed25519'
];
/**
* Break a public or private key down into its constituent components
*
* @param string $key
* @param string $password optional
* @return array
*/
public static function load($key, $password = '')
{
$components = parent::load($key, $password);
if (!isset($components['private'])) {
return $components;
}
$private = $components['private'];
$temp = Strings::base64_encode(Strings::packSSH2('s', $components['type']) . $components['public']);
$components = OpenSSH::load($components['type'] . ' ' . $temp . ' ' . $components['comment']);
if ($components['curve'] instanceof TwistedEdwardsCurve) {
if (Strings::shift($private, 4) != "\0\0\0\x20") {
throw new \RuntimeException('Length of ssh-ed25519 key should be 32');
}
$arr = $components['curve']->extractSecret($private);
$components['dA'] = $arr['dA'];
$components['secret'] = $arr['secret'];
} else {
list($components['dA']) = Strings::unpackSSH2('i', $private);
$components['curve']->rangeCheck($components['dA']);
}
return $components;
}
/**
* Convert a private key to the appropriate format.
*
* @param BigInteger $privateKey
* @param BaseCurve $curve
* @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
* @param string $secret optional
* @param string $password optional
* @param array $options optional
* @return string
*/
public static function savePrivateKey(BigInteger $privateKey, BaseCurve $curve, array $publicKey, $secret = null, $password = false, array $options = [])
{
self::initialize_static_variables();
$public = explode(' ', OpenSSH::savePublicKey($curve, $publicKey));
$name = $public[0];
$public = Strings::base64_decode($public[1]);
list(, $length) = unpack('N', Strings::shift($public, 4));
Strings::shift($public, $length);
// PuTTY pads private keys with a null byte per the following:
// https://github.com/github/putty/blob/a3d14d77f566a41fc61dfdc5c2e0e384c9e6ae8b/sshecc.c#L1926
if (!$curve instanceof TwistedEdwardsCurve) {
$private = $privateKey->toBytes();
if (!(strlen($privateKey->toBits()) & 7)) {
$private = "\0$private";
}
}
$private = $curve instanceof TwistedEdwardsCurve ?
Strings::packSSH2('s', $secret) :
Strings::packSSH2('s', $private);
return self::wrapPrivateKey($public, $private, $name, $password, $options);
}
/**
* Convert an EC public key to the appropriate format
*
* @param BaseCurve $curve
* @param \phpseclib3\Math\Common\FiniteField[] $publicKey
* @return string
*/
public static function savePublicKey(BaseCurve $curve, array $publicKey)
{
$public = explode(' ', OpenSSH::savePublicKey($curve, $publicKey));
$type = $public[0];
$public = Strings::base64_decode($public[1]);
list(, $length) = unpack('N', Strings::shift($public, 4));
Strings::shift($public, $length);
return self::wrapPublicKey($public, $type);
}
}
|
