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<?php |
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namespace Blocktrail\SDK\V3Crypt; |
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use BitWasp\Bitcoin\Mnemonic\MnemonicFactory; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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class Mnemonic |
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{ |
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const CHUNK_SIZE = 4; |
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const PADDING_DUMMY = "\x81"; |
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/** |
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* @param string $data |
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* @return string |
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*/ |
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private static function derivePadding($data) { |
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if (strlen($data) > 0 && ord($data[0]) > 0x80) { |
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throw new \RuntimeException('Sanity check: data for mnemonic is not valid'); |
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} |
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$padLen = self::CHUNK_SIZE - (strlen($data) % self::CHUNK_SIZE); |
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return str_pad('', $padLen, self::PADDING_DUMMY); |
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} |
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/** |
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* @param BufferInterface $data |
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* @return string |
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*/ |
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public static function encode(BufferInterface $data) { |
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$bip39 = MnemonicFactory::bip39(); |
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$mnemonic = $bip39->entropyToMnemonic(new Buffer(self::derivePadding($data->getBinary()) . $data->getBinary())); |
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try { |
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$bip39->mnemonicToEntropy($mnemonic); |
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} catch (\Exception $e) { |
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throw new \RuntimeException('BIP39 produced an invalid mnemonic'); |
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} |
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return $mnemonic; |
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} |
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/** |
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* @param string $mnemonic |
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* @return BufferInterface |
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*/ |
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public static function decode($mnemonic) { |
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$bip39 = MnemonicFactory::bip39(); |
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$decoded = $bip39->mnemonicToEntropy($mnemonic)->getBinary(); |
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$padFinish = 0; |
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while ($decoded[$padFinish] === self::PADDING_DUMMY) { |
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$padFinish++; |
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} |
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$data = substr($decoded, $padFinish); |
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if (self::derivePadding($data) !== substr($decoded, 0, $padFinish)) { |
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throw new \RuntimeException('The data was incorrectly padded'); |
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} |
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return new Buffer($data); |
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} |
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} |
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blocktrail /
blocktrail-sdk-php
