Bit-Wasp /
bitcoin-php
Complex classes like InputSigner often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use InputSigner, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 40 | class InputSigner implements InputSignerInterface |
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| 41 | { |
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| 42 | /** |
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| 43 | * @var array |
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| 44 | */ |
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| 45 | protected static $canSign = [ |
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| 46 | ScriptType::P2PKH, |
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| 47 | ScriptType::P2PK, |
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| 48 | ScriptType::MULTISIG |
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| 49 | ]; |
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| 50 | |||
| 51 | /** |
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| 52 | * @var array |
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| 53 | */ |
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| 54 | protected static $validP2sh = [ |
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| 55 | ScriptType::P2WKH, |
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| 56 | ScriptType::P2WSH, |
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| 57 | ScriptType::P2PKH, |
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| 58 | ScriptType::P2PK, |
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| 59 | ScriptType::MULTISIG |
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| 60 | ]; |
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| 61 | |||
| 62 | /** |
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| 63 | * @var EcAdapterInterface |
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| 64 | */ |
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| 65 | private $ecAdapter; |
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| 66 | |||
| 67 | /** |
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| 68 | * @var OutputData $scriptPubKey |
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| 69 | */ |
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| 70 | private $scriptPubKey; |
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| 71 | |||
| 72 | /** |
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| 73 | * @var OutputData $redeemScript |
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| 74 | */ |
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| 75 | private $redeemScript; |
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| 76 | |||
| 77 | /** |
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| 78 | * @var OutputData $witnessScript |
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| 79 | */ |
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| 80 | private $witnessScript; |
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| 81 | |||
| 82 | /** |
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| 83 | * @var OutputData |
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| 84 | */ |
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| 85 | private $signScript; |
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| 86 | |||
| 87 | /** |
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| 88 | * @var bool |
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| 89 | */ |
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| 90 | private $padUnsignedMultisigs = false; |
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| 91 | |||
| 92 | /** |
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| 93 | * @var bool |
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| 94 | */ |
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| 95 | private $tolerateInvalidPublicKey = false; |
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| 96 | |||
| 97 | /** |
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| 98 | * @var bool |
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| 99 | */ |
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| 100 | private $redeemBitcoinCash = false; |
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| 101 | |||
| 102 | /** |
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| 103 | * @var bool |
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| 104 | */ |
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| 105 | private $allowComplexScripts = false; |
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| 106 | |||
| 107 | /** |
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| 108 | * @var SignData |
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| 109 | */ |
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| 110 | private $signData; |
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| 111 | |||
| 112 | /** |
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| 113 | * @var int |
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| 114 | */ |
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| 115 | private $sigVersion; |
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| 116 | |||
| 117 | /** |
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| 118 | * @var int |
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| 119 | */ |
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| 120 | private $flags; |
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| 121 | |||
| 122 | /** |
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| 123 | * @var TransactionInterface |
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| 124 | */ |
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| 125 | private $tx; |
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| 126 | |||
| 127 | /** |
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| 128 | * @var int |
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| 129 | */ |
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| 130 | private $nInput; |
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| 131 | |||
| 132 | /** |
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| 133 | * @var TransactionOutputInterface |
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| 134 | */ |
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| 135 | private $txOut; |
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| 136 | |||
| 137 | /** |
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| 138 | * @var Interpreter |
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| 139 | */ |
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| 140 | private $interpreter; |
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| 141 | |||
| 142 | /** |
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| 143 | * @var Checker |
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| 144 | */ |
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| 145 | private $signatureChecker; |
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| 146 | |||
| 147 | /** |
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| 148 | * @var TransactionSignatureSerializer |
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| 149 | */ |
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| 150 | private $txSigSerializer; |
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| 151 | |||
| 152 | /** |
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| 153 | * @var PublicKeySerializerInterface |
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| 154 | */ |
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| 155 | private $pubKeySerializer; |
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| 156 | |||
| 157 | /** |
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| 158 | * @var Conditional[]|Checksig[] |
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| 159 | */ |
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| 160 | private $steps = []; |
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| 161 | |||
| 162 | /** |
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| 163 | * InputSigner constructor. |
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| 164 | * |
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| 165 | * Note, the implementation of this class is considered internal |
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| 166 | * and only the methods exposed on InputSignerInterface should |
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| 167 | * be depended on to avoid BC breaks. |
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| 168 | * |
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| 169 | * The only recommended way to produce this class is using Signer::input() |
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| 170 | * |
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| 171 | * @param EcAdapterInterface $ecAdapter |
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| 172 | * @param TransactionInterface $tx |
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| 173 | * @param int $nInput |
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| 174 | * @param TransactionOutputInterface $txOut |
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| 175 | * @param SignData $signData |
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| 176 | * @param TransactionSignatureSerializer|null $sigSerializer |
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| 177 | * @param PublicKeySerializerInterface|null $pubKeySerializer |
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| 178 | */ |
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| 179 | 160 | public function __construct(EcAdapterInterface $ecAdapter, TransactionInterface $tx, $nInput, TransactionOutputInterface $txOut, SignData $signData, TransactionSignatureSerializer $sigSerializer = null, PublicKeySerializerInterface $pubKeySerializer = null) |
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| 180 | { |
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| 181 | 160 | $this->ecAdapter = $ecAdapter; |
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| 182 | 160 | $this->tx = $tx; |
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| 183 | 160 | $this->nInput = $nInput; |
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| 184 | 160 | $this->txOut = $txOut; |
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| 185 | 160 | $this->signData = $signData; |
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| 186 | |||
| 187 | 160 | $this->txSigSerializer = $sigSerializer ?: new TransactionSignatureSerializer(EcSerializer::getSerializer(DerSignatureSerializerInterface::class, true, $ecAdapter)); |
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| 188 | 160 | $this->pubKeySerializer = $pubKeySerializer ?: EcSerializer::getSerializer(PublicKeySerializerInterface::class, true, $ecAdapter); |
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| 189 | 160 | $this->interpreter = new Interpreter($this->ecAdapter); |
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| 190 | 160 | } |
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| 191 | |||
| 192 | /** |
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| 193 | * @return InputSigner |
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| 194 | */ |
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| 195 | 160 | public function extract() |
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| 226 | |||
| 227 | /** |
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| 228 | * @param bool $setting |
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| 229 | * @return $this |
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| 230 | */ |
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| 231 | 130 | public function padUnsignedMultisigs($setting) |
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| 232 | { |
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| 233 | 130 | $this->padUnsignedMultisigs = (bool) $setting; |
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| 234 | 130 | return $this; |
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| 235 | } |
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| 236 | |||
| 237 | /** |
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| 238 | * @param bool $setting |
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| 239 | * @return $this |
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| 240 | */ |
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| 241 | 130 | public function tolerateInvalidPublicKey($setting) |
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| 242 | { |
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| 243 | 130 | $this->tolerateInvalidPublicKey = (bool) $setting; |
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| 244 | 130 | return $this; |
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| 245 | } |
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| 246 | |||
| 247 | /** |
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| 248 | * @param bool $setting |
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| 249 | * @return $this |
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| 250 | */ |
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| 251 | 130 | public function redeemBitcoinCash($setting) |
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| 252 | { |
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| 253 | 130 | $this->redeemBitcoinCash = (bool) $setting; |
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| 254 | 130 | return $this; |
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| 255 | } |
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| 256 | |||
| 257 | /** |
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| 258 | * @param bool $setting |
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| 259 | * @return $this |
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| 260 | */ |
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| 261 | 130 | public function allowComplexScripts($setting) |
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| 262 | { |
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| 263 | 130 | $this->allowComplexScripts = (bool) $setting; |
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| 264 | 130 | return $this; |
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| 265 | } |
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| 266 | |||
| 267 | /** |
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| 268 | * @param BufferInterface $vchPubKey |
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| 269 | * @return PublicKeyInterface|null |
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| 270 | * @throws \Exception |
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| 271 | */ |
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| 272 | 128 | protected function parseStepPublicKey(BufferInterface $vchPubKey) |
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| 273 | { |
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| 274 | try { |
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| 275 | 128 | return $this->pubKeySerializer->parse($vchPubKey); |
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| 276 | 6 | } catch (\Exception $e) { |
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| 277 | 6 | if ($this->tolerateInvalidPublicKey) { |
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| 278 | 2 | return null; |
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| 279 | } |
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| 280 | |||
| 281 | 4 | throw $e; |
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| 282 | } |
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| 283 | } |
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| 284 | |||
| 285 | /** |
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| 286 | * A snippet from OP_CHECKMULTISIG - links keys to signatures |
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| 287 | * |
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| 288 | * @param ScriptInterface $script |
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| 289 | * @param BufferInterface[] $signatures |
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| 290 | * @param BufferInterface[] $publicKeys |
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| 291 | * @param int $sigVersion |
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| 292 | * @return \SplObjectStorage |
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| 293 | */ |
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| 294 | 50 | private function sortMultisigs(ScriptInterface $script, array $signatures, array $publicKeys, $sigVersion) |
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| 295 | { |
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| 296 | 50 | $sigCount = count($signatures); |
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| 297 | 50 | $keyCount = count($publicKeys); |
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| 298 | 50 | $ikey = $isig = 0; |
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| 299 | 50 | $fSuccess = true; |
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| 300 | 50 | $result = new \SplObjectStorage; |
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| 301 | |||
| 302 | 50 | while ($fSuccess && $sigCount > 0) { |
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| 303 | // Fetch the signature and public key |
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| 304 | 50 | $sig = $signatures[$isig]; |
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| 305 | 50 | $pubkey = $publicKeys[$ikey]; |
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| 306 | |||
| 307 | 50 | if ($this->signatureChecker->checkSig($script, $sig, $pubkey, $sigVersion, $this->flags)) { |
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| 308 | 48 | $result[$pubkey] = $sig; |
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| 309 | 48 | $isig++; |
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| 310 | 48 | $sigCount--; |
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| 311 | } |
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| 312 | |||
| 313 | 50 | $ikey++; |
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| 314 | 50 | $keyCount--; |
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| 315 | |||
| 316 | // If there are more signatures left than keys left, |
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| 317 | // then too many signatures have failed. Exit early, |
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| 318 | // without checking any further signatures. |
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| 319 | 50 | if ($sigCount > $keyCount) { |
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| 320 | 2 | $fSuccess = false; |
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| 321 | } |
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| 322 | } |
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| 323 | |||
| 324 | 50 | return $result; |
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| 325 | } |
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| 326 | |||
| 327 | /** |
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| 328 | * @param ScriptInterface $script |
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| 329 | * @return \BitWasp\Buffertools\BufferInterface[] |
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| 330 | */ |
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| 331 | 156 | private function evalPushOnly(ScriptInterface $script) |
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| 332 | { |
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| 333 | 156 | $stack = new Stack(); |
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| 334 | 156 | $this->interpreter->evaluate($script, $stack, SigHash::V0, $this->flags | Interpreter::VERIFY_SIGPUSHONLY, $this->signatureChecker); |
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| 335 | 156 | return $stack->all(); |
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| 336 | } |
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| 337 | |||
| 338 | /** |
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| 339 | * Create a script consisting only of push-data operations. |
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| 340 | * Suitable for a scriptSig. |
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| 341 | * |
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| 342 | * @param BufferInterface[] $buffers |
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| 343 | * @return ScriptInterface |
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| 344 | */ |
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| 345 | private function pushAll(array $buffers) |
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| 346 | { |
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| 347 | 116 | return ScriptFactory::sequence(array_map(function ($buffer) { |
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| 348 | 94 | if (!($buffer instanceof BufferInterface)) { |
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| 349 | throw new \RuntimeException('Script contained a non-push opcode'); |
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| 350 | } |
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| 351 | |||
| 352 | 94 | $size = $buffer->getSize(); |
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| 353 | 94 | if ($size === 0) { |
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| 354 | 44 | return Opcodes::OP_0; |
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| 355 | } |
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| 356 | |||
| 357 | 94 | $first = ord($buffer->getBinary()[0]); |
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| 358 | 94 | if ($size === 1 && $first >= 1 && $first <= 16) { |
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| 359 | 8 | return \BitWasp\Bitcoin\Script\encodeOpN($first); |
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| 360 | } else { |
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| 361 | 94 | return $buffer; |
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| 362 | } |
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| 363 | 116 | }, $buffers)); |
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| 364 | } |
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| 365 | |||
| 366 | /** |
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| 367 | * Verify a scriptSig / scriptWitness against a scriptPubKey. |
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| 368 | * Useful for checking the outcome of certain things, like hash locks (p2sh) |
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| 369 | * |
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| 370 | * @param int $flags |
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| 371 | * @param ScriptInterface $scriptSig |
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| 372 | * @param ScriptInterface $scriptPubKey |
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| 373 | * @param ScriptWitnessInterface|null $scriptWitness |
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| 374 | * @return bool |
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| 375 | */ |
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| 376 | 40 | private function verifySolution($flags, ScriptInterface $scriptSig, ScriptInterface $scriptPubKey, ScriptWitnessInterface $scriptWitness = null) |
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| 377 | { |
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| 378 | 40 | return $this->interpreter->verify($scriptSig, $scriptPubKey, $flags, $this->signatureChecker, $scriptWitness); |
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| 379 | } |
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| 380 | |||
| 381 | /** |
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| 382 | * @param array $decoded |
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| 383 | * @param null $solution |
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| 384 | * @return null|PayToPubkey|PayToPubkeyHash|Multisig |
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| 385 | */ |
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| 386 | 136 | private function classifySignStep(array $decoded, &$solution = null) |
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| 387 | { |
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| 388 | try { |
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| 389 | 136 | $details = Multisig::fromDecodedScript($decoded, $this->pubKeySerializer, true); |
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| 390 | 64 | $solution = $details->getKeyBuffers(); |
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| 391 | 64 | return $details; |
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| 392 | 136 | } catch (\Exception $e) { |
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|
Coding Style
Comprehensibility
introduced
by
|
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| 393 | } |
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| 394 | |||
| 395 | try { |
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| 396 | 136 | $details = PayToPubkey::fromDecodedScript($decoded, true); |
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| 397 | 50 | $solution = $details->getKeyBuffer(); |
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| 398 | 50 | return $details; |
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| 399 | 136 | } catch (\Exception $e) { |
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| 400 | } |
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| 401 | |||
| 402 | try { |
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| 403 | 136 | $details = PayToPubkeyHash::fromDecodedScript($decoded, true); |
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| 404 | 42 | $solution = $details->getPubKeyHash(); |
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| 405 | 42 | return $details; |
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| 406 | 136 | } catch (\Exception $e) { |
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| 407 | } |
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| 408 | |||
| 409 | 136 | return null; |
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| 410 | } |
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| 411 | |||
| 412 | /** |
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| 413 | * @param Operation[] $scriptOps |
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| 414 | * @return Checksig[] |
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| 415 | */ |
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| 416 | 136 | public function parseSequence(array $scriptOps) |
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| 417 | { |
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| 418 | 136 | $j = 0; |
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| 419 | 136 | $l = count($scriptOps); |
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| 420 | 136 | $result = []; |
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| 421 | 136 | while ($j < $l) { |
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| 422 | 136 | $step = null; |
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| 423 | 136 | $slice = null; |
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| 424 | |||
| 425 | // increment the $last, and break if it's valid |
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| 426 | 136 | for ($i = 0; $i < ($l - $j) + 1; $i++) { |
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| 427 | 136 | $slice = array_slice($scriptOps, $j, $i); |
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| 428 | 136 | $step = $this->classifySignStep($slice, $solution); |
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| 429 | 136 | if ($step !== null) { |
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| 430 | 136 | break; |
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| 431 | } |
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| 432 | } |
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| 433 | |||
| 434 | 136 | if (null === $step) { |
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| 435 | throw new \RuntimeException("Invalid script"); |
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| 436 | } else { |
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| 437 | 136 | $j += $i; |
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| 438 | 136 | $result[] = new Checksig($step); |
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| 439 | } |
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| 440 | } |
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| 441 | |||
| 442 | 136 | return $result; |
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| 443 | } |
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| 444 | |||
| 445 | /** |
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| 446 | * @param Operation $operation |
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| 447 | * @param Stack $mainStack |
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| 448 | * @param bool[] $pathData |
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| 449 | * @return Conditional |
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| 450 | */ |
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| 451 | 22 | public function extractConditionalOp(Operation $operation, Stack $mainStack, array &$pathData) |
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| 452 | { |
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| 453 | 22 | $opValue = null; |
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| 454 | |||
| 455 | 22 | if (!$mainStack->isEmpty()) { |
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| 456 | 22 | if (count($pathData) === 0) { |
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| 457 | throw new \RuntimeException("Extracted conditional op (including mainstack) without corresponding element in path data"); |
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| 458 | } |
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| 459 | |||
| 460 | 22 | $opValue = $this->interpreter->castToBool($mainStack->pop()); |
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| 461 | 22 | $dataValue = array_shift($pathData); |
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| 462 | 22 | if ($opValue !== $dataValue) { |
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| 463 | 22 | throw new \RuntimeException("Current stack doesn't follow branch path"); |
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| 464 | } |
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| 465 | } else { |
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| 466 | 18 | if (count($pathData) === 0) { |
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| 467 | throw new \RuntimeException("Extracted conditional op without corresponding element in path data"); |
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| 468 | } |
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| 469 | |||
| 470 | 18 | $opValue = array_shift($pathData); |
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| 471 | } |
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| 472 | |||
| 473 | 22 | $conditional = new Conditional($operation->getOp()); |
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| 474 | |||
| 475 | 22 | if ($opValue !== null) { |
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| 476 | 22 | if (!is_bool($opValue)) { |
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| 477 | throw new \RuntimeException("Sanity check, path value (likely from pathData) was not a bool"); |
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| 478 | } |
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| 479 | |||
| 480 | 22 | $conditional->setValue($opValue); |
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| 481 | } |
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| 482 | |||
| 483 | 22 | return $conditional; |
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| 484 | } |
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| 485 | |||
| 486 | /** |
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| 487 | * @param int $idx |
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| 488 | * @return Checksig|Conditional |
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| 489 | */ |
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| 490 | 36 | public function step($idx) |
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| 491 | { |
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| 492 | 36 | if (!array_key_exists($idx, $this->steps)) { |
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| 493 | throw new \RuntimeException("Out of range index for input sign step"); |
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| 494 | } |
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| 495 | |||
| 496 | 36 | return $this->steps[$idx]; |
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| 497 | } |
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| 498 | |||
| 499 | /** |
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| 500 | * @param OutputData $solution |
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| 501 | * @param array $sigChunks |
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| 502 | * @param SignData $signData |
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| 503 | */ |
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| 504 | 136 | public function extractScript(OutputData $solution, array $sigChunks, SignData $signData) |
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| 505 | { |
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| 506 | 136 | $logicInterpreter = new BranchInterpreter(); |
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| 507 | 136 | $tree = $logicInterpreter->getScriptTree($solution->getScript()); |
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| 508 | |||
| 509 | 136 | if ($tree->hasMultipleBranches()) { |
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| 510 | 22 | $logicalPath = $signData->getLogicalPath(); |
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| 511 | // we need a function like findWitnessScript to 'check' |
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| 512 | // partial signatures against _our_ path |
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| 513 | } else { |
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| 514 | 114 | $logicalPath = []; |
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| 515 | } |
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| 516 | |||
| 517 | $scriptSections = $tree |
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| 518 | 136 | ->getBranchByPath($logicalPath) |
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| 519 | 136 | ->getScriptSections(); |
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| 520 | |||
| 521 | 136 | $vfStack = new Stack(); |
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| 522 | 136 | $stack = new Stack($sigChunks); |
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| 523 | |||
| 524 | 136 | $pathCopy = $logicalPath; |
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| 525 | 136 | $steps = []; |
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| 526 | 136 | foreach ($scriptSections as $i => $scriptSection) { |
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| 527 | /** @var Operation[] $scriptSection */ |
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| 528 | 136 | $fExec = !$this->interpreter->checkExec($vfStack, false); |
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| 529 | 136 | if (count($scriptSection) === 1 && $scriptSection[0]->isLogical()) { |
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| 530 | 22 | $op = $scriptSection[0]; |
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| 531 | 22 | switch ($op->getOp()) { |
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| 532 | 22 | case Opcodes::OP_IF: |
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| 533 | 22 | case Opcodes::OP_NOTIF: |
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| 534 | 22 | $value = false; |
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| 535 | 22 | if ($fExec) { |
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| 536 | // Pop from mainStack if $fExec |
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| 537 | 22 | $step = $this->extractConditionalOp($op, $stack, $pathCopy); |
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| 538 | |||
| 539 | // the Conditional has a value in this case: |
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| 540 | 22 | $value = $step->getValue(); |
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| 541 | |||
| 542 | // Connect the last operation (if there is one) |
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| 543 | // with the last step with isRequired==$value |
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| 544 | // todo: check this part out.. |
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| 545 | 22 | for ($j = count($steps) - 1; $j >= 0; $j--) { |
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| 546 | 8 | if ($steps[$j] instanceof Checksig && $value === $steps[$j]->isRequired()) { |
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| 547 | 8 | $step->providedBy($steps[$j]); |
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| 548 | 8 | break; |
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| 549 | } |
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| 550 | } |
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| 551 | } else { |
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| 552 | 2 | $step = new Conditional($op->getOp()); |
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| 553 | } |
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| 554 | |||
| 555 | 22 | $steps[] = $step; |
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| 556 | |||
| 557 | 22 | if ($op->getOp() === Opcodes::OP_NOTIF) { |
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| 558 | 10 | $value = !$value; |
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| 559 | } |
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| 560 | |||
| 561 | 22 | $vfStack->push($value); |
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| 562 | 22 | break; |
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| 563 | 22 | case Opcodes::OP_ENDIF: |
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| 564 | 22 | $vfStack->pop(); |
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| 565 | 22 | break; |
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| 566 | 18 | case Opcodes::OP_ELSE: |
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| 567 | 18 | $vfStack->push(!$vfStack->pop()); |
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| 568 | 22 | break; |
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| 569 | } |
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| 570 | } else { |
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| 571 | 136 | $templateTypes = $this->parseSequence($scriptSection); |
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| 572 | |||
| 573 | // Detect if effect on mainStack is `false` |
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| 574 | 136 | $resolvesFalse = count($pathCopy) > 0 && !$pathCopy[0]; |
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| 575 | 136 | if ($resolvesFalse) { |
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| 576 | 4 | if (count($templateTypes) > 1) { |
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| 577 | throw new \RuntimeException("Unsupported script, multiple steps to segment which is negated"); |
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| 578 | } |
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| 579 | } |
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| 580 | |||
| 581 | 136 | foreach ($templateTypes as $k => $checksig) { |
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| 582 | 136 | if ($fExec) { |
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| 583 | 136 | $this->extractFromValues($solution->getScript(), $checksig, $stack, $this->sigVersion, $resolvesFalse); |
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| 584 | |||
| 585 | // If this statement results is later consumed |
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| 586 | // by a conditional which would be false, mark |
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| 587 | // this operation as not required |
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| 588 | 126 | if ($resolvesFalse) { |
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| 589 | 4 | $checksig->setRequired(false); |
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| 590 | } |
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| 591 | 126 | $steps[] = $checksig; |
|
| 592 | } |
||
| 593 | } |
||
| 594 | } |
||
| 595 | } |
||
| 596 | |||
| 597 | 126 | $this->steps = $steps; |
|
| 598 | 126 | } |
|
| 599 | |||
| 600 | /** |
||
| 601 | * This function is strictly for $canSign types. |
||
| 602 | * It will extract signatures/publicKeys when given $outputData, and $stack. |
||
| 603 | * $stack is the result of decompiling a scriptSig, or taking the witness data. |
||
| 604 | * |
||
| 605 | * @param ScriptInterface $script |
||
| 606 | * @param Checksig $checksig |
||
| 607 | * @param Stack $stack |
||
| 608 | * @param int $sigVersion |
||
| 609 | * @param bool $expectFalse |
||
| 610 | */ |
||
| 611 | 136 | public function extractFromValues(ScriptInterface $script, Checksig $checksig, Stack $stack, $sigVersion, $expectFalse) |
|
| 612 | { |
||
| 613 | 136 | $size = count($stack); |
|
| 614 | |||
| 615 | 136 | if ($checksig->getType() === ScriptType::P2PKH) { |
|
| 616 | 42 | if ($size > 1) { |
|
| 617 | 38 | $vchPubKey = $stack->pop(); |
|
| 618 | 38 | $vchSig = $stack->pop(); |
|
| 619 | |||
| 620 | 38 | $value = false; |
|
| 621 | 38 | if (!$expectFalse) { |
|
| 622 | 38 | $value = $this->signatureChecker->checkSig($script, $vchSig, $vchPubKey, $this->sigVersion, $this->flags); |
|
| 623 | 38 | if (!$value) { |
|
| 624 | 2 | throw new \RuntimeException('Existing signatures are invalid!'); |
|
| 625 | } |
||
| 626 | } |
||
| 627 | |||
| 628 | 36 | if (!$checksig->isVerify()) { |
|
| 629 | 36 | $stack->push($value ? new Buffer("\x01") : new Buffer()); |
|
| 630 | } |
||
| 631 | |||
| 632 | 36 | if (!$expectFalse) { |
|
| 633 | $checksig |
||
| 634 | 36 | ->setSignature(0, $this->txSigSerializer->parse($vchSig)) |
|
| 635 | 40 | ->setKey(0, $this->parseStepPublicKey($vchPubKey)) |
|
| 636 | ; |
||
| 637 | } |
||
| 638 | } |
||
| 639 | 100 | } else if ($checksig->getType() === ScriptType::P2PK) { |
|
| 640 | 50 | if ($size > 0) { |
|
| 641 | 46 | $vchSig = $stack->pop(); |
|
| 642 | |||
| 643 | 46 | $value = false; |
|
| 644 | 46 | if (!$expectFalse) { |
|
| 645 | 46 | $value = $this->signatureChecker->checkSig($script, $vchSig, $checksig->getSolution(), $this->sigVersion, $this->flags); |
|
| 646 | 46 | if (!$value) { |
|
| 647 | 2 | throw new \RuntimeException('Existing signatures are invalid!'); |
|
| 648 | } |
||
| 649 | } |
||
| 650 | |||
| 651 | 44 | if (!$checksig->isVerify()) { |
|
| 652 | 40 | $stack->push($value ? new Buffer("\x01") : new Buffer()); |
|
| 653 | } |
||
| 654 | |||
| 655 | 44 | if (!$expectFalse) { |
|
| 656 | 44 | $checksig->setSignature(0, $this->txSigSerializer->parse($vchSig)); |
|
| 657 | } |
||
| 658 | } |
||
| 659 | |||
| 660 | 48 | $checksig->setKey(0, $this->parseStepPublicKey($checksig->getSolution())); |
|
| 661 | 64 | } else if (ScriptType::MULTISIG === $checksig->getType()) { |
|
| 662 | /** @var Multisig $info */ |
||
| 663 | 64 | $info = $checksig->getInfo(); |
|
| 664 | 64 | $keyBuffers = $info->getKeyBuffers(); |
|
| 665 | 64 | foreach ($keyBuffers as $idx => $keyBuf) { |
|
| 666 | 64 | $checksig->setKey($idx, $this->parseStepPublicKey($keyBuf)); |
|
| 667 | } |
||
| 668 | |||
| 669 | 60 | $value = false; |
|
| 670 | 60 | if ($this->padUnsignedMultisigs) { |
|
| 671 | // Multisig padding is only used for partially signed transactions, |
||
| 672 | // never fully signed. It is recognized by a scriptSig with $keyCount+1 |
||
| 673 | // values (including the dummy), with one for each candidate signature, |
||
| 674 | // such that $this->signatures state is captured. |
||
| 675 | // The feature serves to skip validation/sorting an incomplete multisig. |
||
| 676 | |||
| 677 | 28 | if ($size === 1 + $info->getKeyCount()) { |
|
| 678 | 4 | $sigBufCount = 0; |
|
| 679 | 4 | $null = new Buffer(); |
|
| 680 | 4 | $keyToSigMap = new \SplObjectStorage(); |
|
| 681 | |||
| 682 | // Reproduce $keyToSigMap and $sigBufCount |
||
| 683 | 4 | for ($i = 0; $i < $info->getKeyCount(); $i++) { |
|
| 684 | 4 | if (!$stack[-1 - $i]->equals($null)) { |
|
| 685 | 4 | $keyToSigMap[$keyBuffers[$i]] = $stack[-1 - $i]; |
|
| 686 | 4 | $sigBufCount++; |
|
| 687 | } |
||
| 688 | } |
||
| 689 | |||
| 690 | // We observed $this->requiredSigs sigs, therefore we can |
||
| 691 | // say the implementation is incompatible |
||
| 692 | 4 | if ($sigBufCount === $checksig->getRequiredSigs()) { |
|
| 693 | 4 | throw new \RuntimeException("Padding is forbidden for a fully signed multisig script"); |
|
| 694 | } |
||
| 695 | |||
| 696 | $toDelete = 1 + $info->getKeyCount(); |
||
| 697 | $value = true; |
||
| 698 | } |
||
| 699 | } |
||
| 700 | |||
| 701 | 60 | if (!isset($toDelete) || !isset($keyToSigMap)) { |
|
| 702 | // Check signatures irrespective of scriptSig size, primes Checker cache, and need info |
||
| 703 | 60 | $sigBufs = []; |
|
| 704 | 60 | $max = min($checksig->getRequiredSigs(), $size - 1); |
|
| 705 | 60 | for ($i = 0; $i < $max; $i++) { |
|
| 706 | 52 | $vchSig = $stack[-1 - $i]; |
|
| 707 | 52 | $sigBufs[] = $vchSig; |
|
| 708 | } |
||
| 709 | |||
| 710 | 60 | $sigBufs = array_reverse($sigBufs); |
|
| 711 | 60 | $sigBufCount = count($sigBufs); |
|
| 712 | |||
| 713 | 60 | if (!$expectFalse) { |
|
| 714 | 58 | if ($sigBufCount > 0) { |
|
| 715 | 50 | $keyToSigMap = $this->sortMultiSigs($script, $sigBufs, $keyBuffers, $sigVersion); |
|
| 716 | // Here we learn if any signatures were invalid, it won't be in the map. |
||
| 717 | 50 | if ($sigBufCount !== count($keyToSigMap)) { |
|
| 718 | 2 | throw new \RuntimeException('Existing signatures are invalid!'); |
|
| 719 | } |
||
| 720 | 48 | $toDelete = 1 + count($keyToSigMap); |
|
| 721 | } else { |
||
| 722 | 56 | $toDelete = 0; |
|
| 723 | 56 | $keyToSigMap = new \SplObjectStorage(); |
|
| 724 | } |
||
| 725 | 56 | $value = true; |
|
| 726 | } else { |
||
| 727 | // should check that all signatures are zero |
||
| 728 | 2 | $keyToSigMap = new \SplObjectStorage(); |
|
| 729 | 2 | $toDelete = min($stack->count(), 1 + $info->getRequiredSigCount()); |
|
| 730 | 2 | $value = false; |
|
| 731 | } |
||
| 732 | } |
||
| 733 | |||
| 734 | 58 | while ($toDelete--) { |
|
| 735 | 50 | $stack->pop(); |
|
| 736 | } |
||
| 737 | |||
| 738 | 58 | foreach ($keyBuffers as $idx => $key) { |
|
| 739 | 58 | if (isset($keyToSigMap[$key])) { |
|
| 740 | 58 | $checksig->setSignature($idx, $this->txSigSerializer->parse($keyToSigMap[$key])); |
|
| 741 | } |
||
| 742 | } |
||
| 743 | |||
| 744 | 58 | if (!$checksig->isVerify()) { |
|
| 745 | 58 | $stack->push($value ? new Buffer("\x01") : new Buffer()); |
|
| 746 | } |
||
| 747 | } else { |
||
| 748 | throw new \RuntimeException('Unsupported output type passed to extractFromValues'); |
||
| 749 | } |
||
| 750 | 126 | } |
|
| 751 | |||
| 752 | /** |
||
| 753 | * Checks $chunks (a decompiled scriptSig) for it's last element, |
||
| 754 | * or defers to SignData. If both are provided, it checks the |
||
| 755 | * value from $chunks against SignData. |
||
| 756 | * |
||
| 757 | * @param BufferInterface[] $chunks |
||
| 758 | * @param SignData $signData |
||
| 759 | * @return ScriptInterface |
||
| 760 | */ |
||
| 761 | 44 | private function findRedeemScript(array $chunks, SignData $signData) |
|
| 762 | { |
||
| 763 | 44 | if (count($chunks) > 0) { |
|
| 764 | 36 | $redeemScript = new Script($chunks[count($chunks) - 1]); |
|
| 765 | 36 | if ($signData->hasRedeemScript()) { |
|
| 766 | 36 | if (!$redeemScript->equals($signData->getRedeemScript())) { |
|
| 767 | 36 | throw new \RuntimeException('Extracted redeemScript did not match sign data'); |
|
| 768 | } |
||
| 769 | } |
||
| 770 | } else { |
||
| 771 | 40 | if (!$signData->hasRedeemScript()) { |
|
| 772 | 2 | throw new \RuntimeException('Redeem script not provided in sign data or scriptSig'); |
|
| 773 | } |
||
| 774 | 38 | $redeemScript = $signData->getRedeemScript(); |
|
| 775 | } |
||
| 776 | |||
| 777 | 40 | return $redeemScript; |
|
| 778 | } |
||
| 779 | |||
| 780 | /** |
||
| 781 | * Checks $witness (a witness structure) for it's last element, |
||
| 782 | * or defers to SignData. If both are provided, it checks the |
||
| 783 | * value from $chunks against SignData. |
||
| 784 | * |
||
| 785 | * @param BufferInterface[] $witness |
||
| 786 | * @param SignData $signData |
||
| 787 | * @return ScriptInterface |
||
| 788 | */ |
||
| 789 | 40 | private function findWitnessScript(array $witness, SignData $signData) |
|
| 790 | { |
||
| 791 | 40 | if (count($witness) > 0) { |
|
| 792 | 32 | $witnessScript = new Script($witness[count($witness) - 1]); |
|
| 793 | 32 | if ($signData->hasWitnessScript()) { |
|
| 794 | 32 | if (!$witnessScript->equals($signData->getWitnessScript())) { |
|
| 795 | 32 | throw new \RuntimeException('Extracted witnessScript did not match sign data'); |
|
| 796 | } |
||
| 797 | } |
||
| 798 | } else { |
||
| 799 | 36 | if (!$signData->hasWitnessScript()) { |
|
| 800 | 4 | throw new \RuntimeException('Witness script not provided in sign data or witness'); |
|
| 801 | } |
||
| 802 | 32 | $witnessScript = $signData->getWitnessScript(); |
|
| 803 | } |
||
| 804 | |||
| 805 | 32 | return $witnessScript; |
|
| 806 | } |
||
| 807 | |||
| 808 | /** |
||
| 809 | * Needs to be called before using the instance. By `extract`. |
||
| 810 | * |
||
| 811 | * It ensures that violating the following prevents instance creation |
||
| 812 | * - the scriptPubKey can be directly signed, or leads to P2SH/P2WSH/P2WKH |
||
| 813 | * - the P2SH script covers signable types and P2WSH/P2WKH |
||
| 814 | * - the witnessScript covers signable types only |
||
| 815 | * |
||
| 816 | * @param SignData $signData |
||
| 817 | * @param ScriptInterface $scriptPubKey |
||
| 818 | * @param ScriptInterface $scriptSig |
||
| 819 | * @param BufferInterface[] $witness |
||
| 820 | * @return $this |
||
| 821 | */ |
||
| 822 | 158 | private function solve(SignData $signData, ScriptInterface $scriptPubKey, ScriptInterface $scriptSig, array $witness) |
|
| 823 | { |
||
| 824 | 158 | $classifier = new OutputClassifier(); |
|
| 825 | 158 | $sigVersion = SigHash::V0; |
|
| 826 | 158 | $solution = $this->scriptPubKey = $classifier->decode($scriptPubKey); |
|
| 827 | |||
| 828 | 158 | if (!$this->allowComplexScripts) { |
|
| 829 | 122 | if ($solution->getType() !== ScriptType::P2SH && !in_array($solution->getType(), self::$validP2sh)) { |
|
| 830 | 2 | throw new \RuntimeException('scriptPubKey not supported'); |
|
| 831 | } |
||
| 832 | } |
||
| 833 | |||
| 834 | 156 | $sigChunks = $this->evalPushOnly($scriptSig); |
|
| 835 | |||
| 836 | 156 | if ($solution->getType() === ScriptType::P2SH) { |
|
| 837 | 44 | $redeemScript = $this->findRedeemScript($sigChunks, $signData); |
|
| 838 | 40 | if (!$this->verifySolution(Interpreter::VERIFY_SIGPUSHONLY, ScriptFactory::sequence([$redeemScript->getBuffer()]), $solution->getScript())) { |
|
| 839 | 2 | throw new \RuntimeException('Redeem script fails to solve pay-to-script-hash'); |
|
| 840 | } |
||
| 841 | |||
| 842 | 38 | $solution = $this->redeemScript = $classifier->decode($redeemScript); |
|
| 843 | 38 | if (!$this->allowComplexScripts) { |
|
| 844 | 38 | if (!in_array($solution->getType(), self::$validP2sh)) { |
|
| 845 | 2 | throw new \RuntimeException('Unsupported pay-to-script-hash script'); |
|
| 846 | } |
||
| 847 | } |
||
| 848 | |||
| 849 | 36 | $sigChunks = array_slice($sigChunks, 0, -1); |
|
| 850 | } |
||
| 851 | |||
| 852 | 148 | if ($solution->getType() === ScriptType::P2WKH) { |
|
| 853 | 8 | $sigVersion = SigHash::V1; |
|
| 854 | 8 | $solution = $classifier->decode(ScriptFactory::scriptPubKey()->payToPubKeyHash($solution->getSolution())); |
|
| 855 | 8 | $sigChunks = $witness; |
|
| 856 | 142 | } else if ($solution->getType() === ScriptType::P2WSH) { |
|
| 857 | 40 | $sigVersion = SigHash::V1; |
|
| 858 | 40 | $witnessScript = $this->findWitnessScript($witness, $signData); |
|
| 859 | |||
| 860 | // Essentially all the reference implementation does |
||
| 861 | 32 | if (!$witnessScript->getWitnessScriptHash()->equals($solution->getSolution())) { |
|
| 862 | 2 | throw new \RuntimeException('Witness script fails to solve witness-script-hash'); |
|
| 863 | } |
||
| 864 | |||
| 865 | 30 | $solution = $this->witnessScript = $classifier->decode($witnessScript); |
|
| 866 | 30 | if (!$this->allowComplexScripts) { |
|
| 867 | 30 | if (!in_array($this->witnessScript->getType(), self::$canSign)) { |
|
| 868 | 2 | throw new \RuntimeException('Unsupported witness-script-hash script'); |
|
| 869 | } |
||
| 870 | } |
||
| 871 | |||
| 872 | 28 | $sigChunks = array_slice($witness, 0, -1); |
|
| 873 | } |
||
| 874 | |||
| 875 | 136 | $this->sigVersion = $sigVersion; |
|
| 876 | 136 | $this->signScript = $solution; |
|
| 877 | |||
| 878 | 136 | $this->extractScript($solution, $sigChunks, $signData); |
|
| 879 | |||
| 880 | 126 | return $this; |
|
| 881 | } |
||
| 882 | |||
| 883 | /** |
||
| 884 | * Pure function to produce a signature hash for a given $scriptCode, $sigHashType, $sigVersion. |
||
| 885 | * |
||
| 886 | * @param ScriptInterface $scriptCode |
||
| 887 | * @param int $sigHashType |
||
| 888 | * @param int $sigVersion |
||
| 889 | * @return BufferInterface |
||
| 890 | */ |
||
| 891 | 118 | public function calculateSigHashUnsafe(ScriptInterface $scriptCode, $sigHashType, $sigVersion) |
|
| 899 | |||
| 900 | /** |
||
| 901 | * Calculates the signature hash for the input for the given $sigHashType. |
||
| 902 | * |
||
| 903 | * @param int $sigHashType |
||
| 904 | * @return BufferInterface |
||
| 905 | */ |
||
| 906 | 2 | public function getSigHash($sigHashType) |
|
| 907 | { |
||
| 908 | 2 | return $this->calculateSigHashUnsafe($this->signScript->getScript(), $sigHashType, $this->sigVersion); |
|
| 909 | } |
||
| 910 | |||
| 911 | /** |
||
| 912 | * Pure function to produce a signature for a given $key, $scriptCode, $sigHashType, $sigVersion. |
||
| 913 | * |
||
| 914 | * @param PrivateKeyInterface $key |
||
| 915 | * @param ScriptInterface $scriptCode |
||
| 916 | * @param int $sigHashType |
||
| 917 | * @param int $sigVersion |
||
| 918 | * @return TransactionSignatureInterface |
||
| 919 | */ |
||
| 920 | 116 | private function calculateSignature(PrivateKeyInterface $key, ScriptInterface $scriptCode, $sigHashType, $sigVersion) |
|
| 926 | |||
| 927 | /** |
||
| 928 | * Returns whether all required signatures have been provided. |
||
| 929 | * |
||
| 930 | * @return bool |
||
| 931 | */ |
||
| 932 | 74 | public function isFullySigned() |
|
| 933 | { |
||
| 934 | 74 | foreach ($this->steps as $step) { |
|
| 935 | 74 | if ($step instanceof Conditional) { |
|
| 936 | if (!$step->hasValue()) { |
||
| 937 | return false; |
||
| 938 | } |
||
| 939 | 74 | } else if ($step instanceof Checksig) { |
|
| 940 | 74 | if (!$step->isFullySigned()) { |
|
| 941 | 74 | return false; |
|
| 948 | |||
| 949 | /** |
||
| 950 | * Returns the required number of signatures for this input. |
||
| 951 | * |
||
| 952 | * @return int |
||
| 953 | */ |
||
| 954 | 74 | public function getRequiredSigs() |
|
| 964 | |||
| 965 | /** |
||
| 966 | * Returns an array where the values are either null, |
||
| 967 | * or a TransactionSignatureInterface. |
||
| 968 | * |
||
| 969 | * @return TransactionSignatureInterface[] |
||
| 970 | */ |
||
| 971 | 74 | public function getSignatures() |
|
| 975 | |||
| 976 | /** |
||
| 977 | * Returns an array where the values are either null, |
||
| 978 | * or a PublicKeyInterface. |
||
| 979 | * |
||
| 980 | * @return PublicKeyInterface[] |
||
| 981 | */ |
||
| 982 | 52 | public function getPublicKeys() |
|
| 986 | |||
| 987 | /** |
||
| 988 | * OutputData for the script to be signed (will be |
||
| 989 | * equal to getScriptPubKey, or getRedeemScript, or |
||
| 990 | * getWitnessScript. |
||
| 991 | * |
||
| 992 | * @return OutputData |
||
| 993 | */ |
||
| 994 | 50 | public function getSignScript() |
|
| 998 | |||
| 999 | /** |
||
| 1000 | * OutputData for the txOut script. |
||
| 1001 | * |
||
| 1002 | * @return OutputData |
||
| 1003 | */ |
||
| 1004 | 24 | public function getScriptPubKey() |
|
| 1008 | |||
| 1009 | /** |
||
| 1010 | * Returns OutputData for the P2SH redeemScript. |
||
| 1011 | * |
||
| 1012 | * @return OutputData |
||
| 1013 | */ |
||
| 1014 | 18 | public function getRedeemScript() |
|
| 1022 | |||
| 1023 | /** |
||
| 1024 | * Returns OutputData for the P2WSH witnessScript. |
||
| 1025 | * |
||
| 1026 | * @return OutputData |
||
| 1027 | */ |
||
| 1028 | 14 | public function getWitnessScript() |
|
| 1036 | |||
| 1037 | /** |
||
| 1038 | * Returns whether the scriptPubKey is P2SH. |
||
| 1039 | * |
||
| 1040 | * @return bool |
||
| 1041 | */ |
||
| 1042 | 50 | public function isP2SH() |
|
| 1050 | |||
| 1051 | /** |
||
| 1052 | * Returns whether the scriptPubKey or redeemScript is P2WSH. |
||
| 1053 | * |
||
| 1054 | * @return bool |
||
| 1055 | */ |
||
| 1056 | 50 | public function isP2WSH() |
|
| 1070 | |||
| 1071 | /** |
||
| 1072 | * @param int $stepIdx |
||
| 1073 | * @param PrivateKeyInterface $privateKey |
||
| 1074 | * @param int $sigHashType |
||
| 1075 | * @return $this |
||
| 1076 | */ |
||
| 1077 | 122 | public function signStep($stepIdx, PrivateKeyInterface $privateKey, $sigHashType = SigHash::ALL) |
|
| 1141 | |||
| 1142 | /** |
||
| 1143 | * Sign the input using $key and $sigHashTypes |
||
| 1144 | * |
||
| 1145 | * @param PrivateKeyInterface $privateKey |
||
| 1146 | * @param int $sigHashType |
||
| 1147 | * @return $this |
||
| 1148 | */ |
||
| 1149 | 86 | public function sign(PrivateKeyInterface $privateKey, $sigHashType = SigHash::ALL) |
|
| 1153 | |||
| 1154 | /** |
||
| 1155 | * Verifies the input using $flags for script verification |
||
| 1156 | * |
||
| 1157 | * @param int $flags |
||
| 1158 | * @return bool |
||
| 1159 | */ |
||
| 1160 | 86 | public function verify($flags = null) |
|
| 1194 | |||
| 1195 | /** |
||
| 1196 | * @return array |
||
| 1197 | */ |
||
| 1198 | 116 | private function serializeSteps() |
|
| 1230 | |||
| 1231 | /** |
||
| 1232 | * Produces a SigValues instance containing the scriptSig & script witness |
||
| 1233 | * |
||
| 1234 | * @return SigValues |
||
| 1235 | */ |
||
| 1236 | 116 | public function serializeSignatures() |
|
| 1270 | |||
| 1271 | 50 | public function getSteps() |
|
| 1275 | } |
||
| 1276 |
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