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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
<?php
/**
* XML Formatted RSA Key Handler
*
* More info:
*
* http://www.w3.org/TR/xmldsig-core/#sec-RSAKeyValue
* http://www.w3.org/TR/xkms2/#XKMS_2_0_Paragraph_269
* http://en.wikipedia.org/wiki/XML_Signature
* http://en.wikipedia.org/wiki/XKMS
*
* PHP version 5
*
* @author Jim Wigginton <[email protected]>
* @copyright 2015 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib3\Crypt\RSA\Formats\Keys;
use phpseclib3\Common\Functions\Strings;
use phpseclib3\Exception\BadConfigurationException;
use phpseclib3\Exception\UnsupportedFormatException;
use phpseclib3\Math\BigInteger;
/**
* XML Formatted RSA Key Handler
*
* @author Jim Wigginton <[email protected]>
*/
abstract class XML
{
/**
* 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, $password = '')
{
if (!Strings::is_stringable($key)) {
throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
}
if (!class_exists('DOMDocument')) {
throw new BadConfigurationException('The dom extension is not setup correctly on this system');
}
$components = [
'isPublicKey' => false,
'primes' => [],
'exponents' => [],
'coefficients' => []
];
$use_errors = libxml_use_internal_errors(true);
$dom = new \DOMDocument();
if (substr($key, 0, 5) != '<?xml') {
$key = '<xml>' . $key . '</xml>';
}
if (!$dom->loadXML($key)) {
libxml_use_internal_errors($use_errors);
throw new \UnexpectedValueException('Key does not appear to contain XML');
}
$xpath = new \DOMXPath($dom);
$keys = ['modulus', 'exponent', 'p', 'q', 'dp', 'dq', 'inverseq', 'd'];
foreach ($keys as $key) {
// $dom->getElementsByTagName($key) is case-sensitive
$temp = $xpath->query("//*[translate(local-name(), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ','abcdefghijklmnopqrstuvwxyz')='$key']");
if (!$temp->length) {
continue;
}
$value = new BigInteger(Strings::base64_decode($temp->item(0)->nodeValue), 256);
switch ($key) {
case 'modulus':
$components['modulus'] = $value;
break;
case 'exponent':
$components['publicExponent'] = $value;
break;
case 'p':
$components['primes'][1] = $value;
break;
case 'q':
$components['primes'][2] = $value;
break;
case 'dp':
$components['exponents'][1] = $value;
break;
case 'dq':
$components['exponents'][2] = $value;
break;
case 'inverseq':
$components['coefficients'][2] = $value;
break;
case 'd':
$components['privateExponent'] = $value;
}
}
libxml_use_internal_errors($use_errors);
foreach ($components as $key => $value) {
if (is_array($value) && !count($value)) {
unset($components[$key]);
}
}
if (isset($components['modulus']) && isset($components['publicExponent'])) {
if (count($components) == 3) {
$components['isPublicKey'] = true;
}
return $components;
}
throw new \UnexpectedValueException('Modulus / exponent not present');
}
/**
* Convert a private key to the appropriate format.
*
* @param \phpseclib3\Math\BigInteger $n
* @param \phpseclib3\Math\BigInteger $e
* @param \phpseclib3\Math\BigInteger $d
* @param array $primes
* @param array $exponents
* @param array $coefficients
* @param string $password optional
* @return string
*/
public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '')
{
if (count($primes) != 2) {
throw new \InvalidArgumentException('XML does not support multi-prime RSA keys');
}
if (!empty($password) && is_string($password)) {
throw new UnsupportedFormatException('XML private keys do not support encryption');
}
return "<RSAKeyPair>\r\n" .
' <Modulus>' . Strings::base64_encode($n->toBytes()) . "</Modulus>\r\n" .
' <Exponent>' . Strings::base64_encode($e->toBytes()) . "</Exponent>\r\n" .
' <P>' . Strings::base64_encode($primes[1]->toBytes()) . "</P>\r\n" .
' <Q>' . Strings::base64_encode($primes[2]->toBytes()) . "</Q>\r\n" .
' <DP>' . Strings::base64_encode($exponents[1]->toBytes()) . "</DP>\r\n" .
' <DQ>' . Strings::base64_encode($exponents[2]->toBytes()) . "</DQ>\r\n" .
' <InverseQ>' . Strings::base64_encode($coefficients[2]->toBytes()) . "</InverseQ>\r\n" .
' <D>' . Strings::base64_encode($d->toBytes()) . "</D>\r\n" .
'</RSAKeyPair>';
}
/**
* Convert a public key to the appropriate format
*
* @param \phpseclib3\Math\BigInteger $n
* @param \phpseclib3\Math\BigInteger $e
* @return string
*/
public static function savePublicKey(BigInteger $n, BigInteger $e)
{
return "<RSAKeyValue>\r\n" .
' <Modulus>' . Strings::base64_encode($n->toBytes()) . "</Modulus>\r\n" .
' <Exponent>' . Strings::base64_encode($e->toBytes()) . "</Exponent>\r\n" .
'</RSAKeyValue>';
}
}
|
