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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Bitcoin\Key\Deterministic; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Key\KeyInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PrivateKeyInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PublicKeyInterface; |
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use BitWasp\Bitcoin\Crypto\Hash; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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class ElectrumKey |
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{ |
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/** |
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* @var null|PrivateKeyInterface |
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*/ |
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private $masterPrivate; |
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/** |
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* @var PublicKeyInterface |
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*/ |
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private $masterPublic; |
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/** |
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* @param KeyInterface $masterKey |
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*/ |
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public function __construct(KeyInterface $masterKey) |
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{ |
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if ($masterKey->isCompressed()) { |
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throw new \RuntimeException('Electrum keys are not compressed'); |
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} |
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if ($masterKey instanceof PrivateKeyInterface) { |
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$this->masterPrivate = $masterKey; |
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$this->masterPublic = $masterKey->getPublicKey(); |
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} elseif ($masterKey instanceof PublicKeyInterface) { |
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$this->masterPublic = $masterKey; |
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} |
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} |
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/** |
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* @return PrivateKeyInterface |
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*/ |
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public function getMasterPrivateKey(): PrivateKeyInterface |
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{ |
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if (null === $this->masterPrivate) { |
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throw new \RuntimeException("Cannot produce master private key from master public key"); |
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} |
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return $this->masterPrivate; |
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} |
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/** |
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* @return PublicKeyInterface |
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*/ |
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public function getMasterPublicKey(): PublicKeyInterface |
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{ |
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return $this->masterPublic; |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getMPK(): BufferInterface |
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{ |
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return $this->getMasterPublicKey()->getBuffer()->slice(1); |
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} |
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/** |
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* @param int $sequence |
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* @param bool $change |
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* @return \GMP |
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*/ |
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public function getSequenceOffset(int $sequence, bool $change = false): \GMP |
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{ |
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$seed = new Buffer(sprintf("%s:%d:%s", $sequence, $change ? 1 : 0, $this->getMPK()->getBinary())); |
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return Hash::sha256d($seed)->getGmp(); |
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} |
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/** |
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* @param int $sequence |
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* @param bool $change |
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* @return KeyInterface |
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*/ |
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public function deriveChild(int $sequence, bool $change = false): KeyInterface |
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{ |
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$key = is_null($this->masterPrivate) ? $this->masterPublic : $this->masterPrivate; |
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return $key->tweakAdd($this->getSequenceOffset($sequence, $change)); |
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} |
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/** |
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* @return ElectrumKey |
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*/ |
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public function withoutPrivateKey(): ElectrumKey |
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{ |
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$clone = clone $this; |
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$clone->masterPrivate = null; |
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return $clone; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
