|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace BitWasp\Bitcoin; |
|
4
|
|
|
|
|
5
|
|
|
use BitWasp\Bitcoin\Exceptions\Bech32Exception; |
|
6
|
|
|
use BitWasp\Bitcoin\Network\NetworkInterface; |
|
7
|
|
|
use BitWasp\Bitcoin\Script\WitnessProgram; |
|
8
|
|
|
use BitWasp\Buffertools\Buffer; |
|
9
|
|
|
|
|
10
|
|
|
class SegwitBech32 |
|
11
|
|
|
{ |
|
12
|
|
|
/** |
|
13
|
|
|
* Takes the $hrp and $witnessProgram and produces a native segwit |
|
14
|
|
|
* address. |
|
15
|
|
|
* |
|
16
|
|
|
* @param WitnessProgram $witnessProgram |
|
17
|
|
|
* @param NetworkInterface $network |
|
18
|
|
|
* @return string |
|
19
|
|
|
*/ |
|
20
|
14 |
|
public static function encode(WitnessProgram $witnessProgram, NetworkInterface $network = null) |
|
21
|
|
|
{ |
|
22
|
|
|
// do this first, why bother encoding if the network doesn't support it.. |
|
23
|
14 |
|
$network = $network ?: Bitcoin::getNetwork(); |
|
24
|
14 |
|
$hrp = $network->getSegwitBech32Prefix(); |
|
25
|
|
|
|
|
26
|
14 |
|
$programChars = array_values(unpack('C*', $witnessProgram->getProgram()->getBinary())); |
|
27
|
14 |
|
$programBits = Bech32::convertBits($programChars, count($programChars), 8, 5, true); |
|
28
|
14 |
|
$encodeData = array_merge([$witnessProgram->getVersion()], $programBits); |
|
29
|
|
|
|
|
30
|
14 |
|
return Bech32::encode($hrp, $encodeData); |
|
31
|
|
|
} |
|
32
|
|
|
|
|
33
|
|
|
/** |
|
34
|
|
|
* Decodes the provided $bech32 string, validating against |
|
35
|
|
|
* the chosen prefix. |
|
36
|
|
|
* |
|
37
|
|
|
* @param string $bech32 |
|
38
|
|
|
* @param NetworkInterface $network |
|
39
|
|
|
* @return WitnessProgram |
|
40
|
|
|
* @throws Bech32Exception |
|
41
|
|
|
*/ |
|
42
|
40 |
|
public static function decode($bech32, NetworkInterface $network = null) |
|
43
|
|
|
{ |
|
44
|
40 |
|
$network = $network ?: Bitcoin::getNetwork(); |
|
45
|
40 |
|
$hrp = $network->getSegwitBech32Prefix(); |
|
46
|
|
|
|
|
47
|
40 |
|
list ($hrpGot, $data) = Bech32::decode($bech32); |
|
48
|
36 |
|
if ($hrpGot !== $hrp) { |
|
49
|
14 |
|
throw new Bech32Exception('Invalid prefix for address'); |
|
50
|
|
|
} |
|
51
|
|
|
|
|
52
|
34 |
|
$decoded = Bech32::convertBits(array_slice($data, 1), count($data) - 1, 5, 8, false); |
|
53
|
30 |
|
$decodeLen = count($decoded); |
|
54
|
30 |
|
if ($decodeLen < 2 || $decodeLen > 40) { |
|
55
|
4 |
|
throw new Bech32Exception('Invalid segwit address'); |
|
56
|
|
|
} |
|
57
|
|
|
|
|
58
|
26 |
|
if ($data[0] > 16) { |
|
59
|
2 |
|
throw new Bech32Exception('Invalid witness program version'); |
|
60
|
|
|
} |
|
61
|
|
|
|
|
62
|
24 |
|
$bytes = ''; |
|
63
|
24 |
|
foreach ($decoded as $char) { |
|
64
|
24 |
|
$bytes .= chr($char); |
|
65
|
|
|
} |
|
66
|
24 |
|
$decoded = new Buffer($bytes); |
|
67
|
|
|
|
|
68
|
24 |
|
if (0 === $data[0]) { |
|
69
|
18 |
|
return WitnessProgram::v0($decoded); |
|
70
|
|
|
} |
|
71
|
|
|
|
|
72
|
6 |
|
return new WitnessProgram($data[0], $decoded); |
|
73
|
|
|
} |
|
74
|
|
|
} |
|
75
|
|
|
|
Bit-Wasp /
bitcoin-php
