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<?php declare(strict_types=1); |
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namespace BitWasp\Bitcoin\Crypto\EcAdapter\Impl\Secp256k1\Key; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\Secp256k1\Signature\SchnorrSignature; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Key\XOnlyPublicKeyInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Signature\SchnorrSignatureInterface; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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class XOnlyPublicKey implements XOnlyPublicKeyInterface |
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{ |
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/** |
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* @var resource |
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*/ |
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private $context; |
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/** |
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* @var resource |
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*/ |
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private $xonlyKey; |
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/** |
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* @var bool |
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*/ |
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private $isPositive; |
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/** |
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* @param resource $context |
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* @param resource $xonlyKey |
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*/ |
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public function __construct($context, $xonlyKey) |
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{ |
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if (!is_resource($context) || |
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!get_resource_type($context) === SECP256K1_TYPE_CONTEXT) { |
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throw new \InvalidArgumentException('Secp256k1\Key\XOnlyPublicKey expects ' . SECP256K1_TYPE_CONTEXT . ' resource'); |
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} |
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if (!(is_resource($xonlyKey) && get_resource_type($xonlyKey) === SECP256K1_TYPE_XONLY_PUBKEY)) { |
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throw new \InvalidArgumentException('Secp256k1\Key\XOnlyPublicKey expects ' . SECP256K1_TYPE_XONLY_PUBKEY . ' resource'); |
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} |
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$this->context = $context; |
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$this->xonlyKey = $xonlyKey; |
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} |
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public function isPositive(): bool |
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{ |
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if (null === $this->isPositive) { |
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$x = gmp_init(unpack("H*", $this->getBuffer()->getBinary())[1], 16); |
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$p = gmp_init("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16); |
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// todo: is this === 1 or >= 0 |
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// https://github.com/bitcoin-core/secp256k1/blob/1c131affd3c3402f269b56685bca63c631cfcf26/src/field_impl.h#L311 |
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// https://github.com/sipa/bitcoin/commit/348b0e0e00c0ebe57c180e49b08edcecde5f9158#diff-607598e1a39100b1883191275b789557R278 |
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$this->isPositive = gmp_jacobi($x, $p) === 1; |
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} |
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return $this->isPositive; |
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} |
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private function doVerifySchnorr(BufferInterface $msg32, SchnorrSignature $schnorrSig): bool |
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{ |
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return (bool) secp256k1_schnorrsig_verify($this->context, $schnorrSig->getResource(), $msg32->getBinary(), $this->xonlyKey); |
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} |
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public function verifySchnorr(BufferInterface $msg32, SchnorrSignatureInterface $schnorrSignature): bool |
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{ |
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/** @var SchnorrSignature $schnorrSignature */ |
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return $this->doVerifySchnorr($msg32, $schnorrSignature); |
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} |
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/** |
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* @return resource |
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* @throws \Exception |
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*/ |
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private function clonePubkey() |
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{ |
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$context = $this->context; |
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$serialized = ''; |
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if (1 !== secp256k1_xonly_pubkey_serialize($context, $serialized, $this->xonlyKey)) { |
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throw new \Exception('failed to serialize xonly pubkey for clone'); |
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} |
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/** @var resource $clone */ |
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$clone = null; |
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if (1 !== secp256k1_xonly_pubkey_parse($context, $clone, $serialized)) { |
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throw new \Exception('failed to parse xonly pubkey'); |
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} |
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return $clone; |
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} |
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public function tweakAdd(BufferInterface $tweak32): XOnlyPublicKeyInterface |
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{ |
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$pubkey = $this->clonePubkey(); |
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$tweaked = null; |
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if (!secp256k1_xonly_pubkey_tweak_add($this->context, $tweaked, $pubkey, $tweak32->getBinary())) { |
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throw new \RuntimeException("failed to tweak pubkey"); |
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} |
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return new XOnlyPublicKey($this->context, $pubkey); |
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} |
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public function getBuffer(): BufferInterface |
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{ |
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$out = ''; |
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if (!secp256k1_xonly_pubkey_serialize($this->context, $out, $this->xonlyKey)) { |
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throw new \RuntimeException("failed to serialize xonly pubkey!"); |
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} |
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return new Buffer($out); |
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} |
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} |
Bit-Wasp /
bitcoin-php
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