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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Bitcoin\Mnemonic\Electrum; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Adapter\EcAdapterInterface; |
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use BitWasp\Bitcoin\Mnemonic\MnemonicInterface; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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class ElectrumMnemonic implements MnemonicInterface |
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{ |
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/** |
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* @var EcAdapterInterface |
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*/ |
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private $ecAdapter; |
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/** |
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* @var ElectrumWordListInterface |
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*/ |
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private $wordList; |
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/** |
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* @param EcAdapterInterface $ecAdapter |
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* @param ElectrumWordListInterface $wordList |
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*/ |
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public function __construct(EcAdapterInterface $ecAdapter, ElectrumWordListInterface $wordList) |
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{ |
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$this->ecAdapter = $ecAdapter; |
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$this->wordList = $wordList; |
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} |
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/** |
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* @param BufferInterface $entropy |
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* @return string[] |
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* @throws \Exception |
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*/ |
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public function entropyToWords(BufferInterface $entropy): array |
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{ |
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$math = $this->ecAdapter->getMath(); |
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$n = gmp_init(count($this->wordList), 10); |
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$wordArray = []; |
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$chunks = $entropy->getSize() / 4; |
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for ($i = 0; $i < $chunks; $i++) { |
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$x = $entropy->slice(4*$i, 4)->getGmp(); |
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$index1 = $math->mod($x, $n); |
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$index2 = $math->mod($math->add($math->div($x, $n), $index1), $n); |
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$index3 = $math->mod($math->add($math->div($math->div($x, $n), $n), $index2), $n); |
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$wordArray[] = $this->wordList->getWord((int) gmp_strval($index1, 10)); |
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$wordArray[] = $this->wordList->getWord((int) gmp_strval($index2, 10)); |
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$wordArray[] = $this->wordList->getWord((int) gmp_strval($index3, 10)); |
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} |
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return $wordArray; |
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} |
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/** |
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* @param BufferInterface $entropy |
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* @return string |
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*/ |
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public function entropyToMnemonic(BufferInterface $entropy): string |
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{ |
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return implode(' ', $this->entropyToWords($entropy)); |
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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 function mnemonicToEntropy(string $mnemonic): BufferInterface |
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{ |
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$math = $this->ecAdapter->getMath(); |
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$wordList = $this->wordList; |
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$words = explode(' ', $mnemonic); |
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$n = gmp_init(count($wordList), 10); |
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$thirdWordCount = count($words) / 3; |
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$out = ''; |
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for ($i = 0; $i < $thirdWordCount; $i++) { |
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list ($index1, $index2, $index3) = array_map(function ($v) use ($wordList) { |
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return gmp_init($wordList->getIndex($v), 10); |
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}, array_slice($words, 3 * $i, 3)); |
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$x = $math->add( |
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$index1, |
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$math->add( |
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$math->mul( |
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$n, |
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$math->mod($math->sub($index2, $index1), $n) |
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), |
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$math->mul( |
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$n, |
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$math->mul( |
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$n, |
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$math->mod($math->sub($index3, $index2), $n) |
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) |
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) |
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) |
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); |
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$out .= str_pad(gmp_strval($x, 16), 8, '0', STR_PAD_LEFT); |
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} |
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return Buffer::hex($out); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
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