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<?php |
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namespace BitWasp\Bitcoin; |
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use BitWasp\Bitcoin\Exceptions\Bech32Exception; |
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use BitWasp\Bitcoin\Network\NetworkInterface; |
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use BitWasp\Bitcoin\Script\WitnessProgram; |
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use BitWasp\Buffertools\Buffer; |
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class SegwitBech32 |
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{ |
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/** |
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* Takes the $hrp and $witnessProgram and produces a native segwit |
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* address. |
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* |
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* @param WitnessProgram $witnessProgram |
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* @param NetworkInterface $network |
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* @return string |
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*/ |
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public static function encode(WitnessProgram $witnessProgram, NetworkInterface $network = null) |
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{ |
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// do this first, why bother encoding if the network doesn't support it.. |
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$network = $network ?: Bitcoin::getNetwork(); |
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$hrp = $network->getSegwitBech32Prefix(); |
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$programChars = array_values(unpack('C*', $witnessProgram->getProgram()->getBinary())); |
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$programBits = Bech32::convertBits($programChars, count($programChars), 8, 5, true); |
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$encodeData = array_merge([$witnessProgram->getVersion()], $programBits); |
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return Bech32::encode($hrp, $encodeData); |
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} |
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/** |
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* Decodes the provided $bech32 string, validating against |
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* the chosen prefix. |
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* |
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* @param string $bech32 |
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* @param NetworkInterface $network |
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* @return WitnessProgram |
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* @throws Bech32Exception |
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*/ |
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public static function decode($bech32, NetworkInterface $network = null) |
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{ |
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$network = $network ?: Bitcoin::getNetwork(); |
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$hrp = $network->getSegwitBech32Prefix(); |
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list ($hrpGot, $data) = Bech32::decode($bech32); |
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if ($hrpGot !== $hrp) { |
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throw new Bech32Exception('Invalid prefix for address'); |
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} |
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$decoded = Bech32::convertBits(array_slice($data, 1), count($data) - 1, 5, 8, false); |
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$decodeLen = count($decoded); |
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if ($decodeLen < 2 || $decodeLen > 40) { |
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throw new Bech32Exception('Invalid segwit address'); |
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} |
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if ($data[0] > 16) { |
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throw new Bech32Exception('Invalid witness program version'); |
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} |
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$bytes = ''; |
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foreach ($decoded as $char) { |
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$bytes .= chr($char); |
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} |
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$decoded = new Buffer($bytes); |
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if (0 === $data[0]) { |
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return WitnessProgram::v0($decoded); |
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} |
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return new WitnessProgram($data[0], $decoded); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
