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<?php |
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/** |
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* Copyright 2017 American Express Travel Related Services Company, Inc. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
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* or implied. See the License for the specific language governing |
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* permissions and limitations under the License. |
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*/ |
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declare(strict_types=1); |
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namespace AmericanExpress\HyperledgerFabricClient\Signatory; |
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use AmericanExpress\HyperledgerFabricClient\Exception\RuntimeException; |
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use AmericanExpress\HyperledgerFabricClient\ProtoFactory\SignedProposalFactory; |
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use AmericanExpress\HyperledgerFabricClient\Serializer\AsciiCharStringSerializer; |
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use AmericanExpress\HyperledgerFabricClient\HashAlgorithm; |
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use AmericanExpress\HyperledgerFabricClient\Serializer\SignedCharStringSerializer; |
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use Hyperledger\Fabric\Protos\Peer\Proposal; |
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use Hyperledger\Fabric\Protos\Peer\SignedProposal; |
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use Mdanter\Ecc\Crypto\Key\PrivateKeyInterface; |
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use Mdanter\Ecc\Crypto\Signature\HasherInterface; |
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use Mdanter\Ecc\Crypto\Signature\Signature; |
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use Mdanter\Ecc\Crypto\Signature\SignatureInterface; |
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use Mdanter\Ecc\Crypto\Signature\SignHasher; |
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use Mdanter\Ecc\EccFactory; |
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use Mdanter\Ecc\Crypto\Signature\Signer; |
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use Mdanter\Ecc\Math\GmpMath; |
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use Mdanter\Ecc\Math\GmpMathInterface; |
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use Mdanter\Ecc\Primitives\GeneratorPoint; |
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use Mdanter\Ecc\Random\RandomGeneratorFactory; |
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use Mdanter\Ecc\Serializer\PrivateKey\PemPrivateKeySerializer; |
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use Mdanter\Ecc\Serializer\PrivateKey\DerPrivateKeySerializer; |
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use Mdanter\Ecc\Serializer\Signature\DerSignatureSerializer; |
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final class MdanterEccSignatory implements SignatoryInterface |
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{ |
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/** |
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* @var DerSignatureSerializer |
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*/ |
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private $derSignatureSerializer; |
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/** |
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* @var GmpMath |
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*/ |
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private $gmpMath; |
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/** |
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* @var HashAlgorithm |
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*/ |
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private $hashAlgorithm; |
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/** |
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* @var AsciiCharStringSerializer |
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*/ |
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private $asciiCharStringSerializer; |
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/** |
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* @var SignedCharStringSerializer |
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*/ |
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private $signedCharStringSerializer; |
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/** |
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* @var GmpMathInterface |
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*/ |
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private $adapter; |
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/** |
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* @var GeneratorPoint |
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*/ |
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private $generator; |
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/** |
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* @var Signer |
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*/ |
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private $signer; |
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/** |
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* @var HasherInterface |
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*/ |
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private $hasher; |
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/** |
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* Utils constructor. |
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* @param HashAlgorithm $hashAlgorithm |
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* @throws RuntimeException |
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* @throws \AmericanExpress\HyperledgerFabricClient\Exception\InvalidArgumentException |
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*/ |
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public function __construct(HashAlgorithm $hashAlgorithm = null) |
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{ |
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$this->hashAlgorithm = $hashAlgorithm ?: new HashAlgorithm(); |
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$this->asciiCharStringSerializer = new AsciiCharStringSerializer(); |
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$this->signedCharStringSerializer = new SignedCharStringSerializer(); |
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$this->adapter = EccFactory::getAdapter(); |
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$this->generator = EccFactory::getNistCurves()->generator256(); |
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$this->signer = new Signer($this->adapter); |
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$this->gmpMath = new GmpMath(); |
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$this->hasher = new SignHasher((string) $this->hashAlgorithm, $this->gmpMath); |
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$this->derSignatureSerializer = new DerSignatureSerializer(); |
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} |
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/** |
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* @param Proposal $proposal |
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* @param \SplFileObject $privateKeyFile |
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* @return SignedProposal |
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*/ |
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public function signProposal(Proposal $proposal, \SplFileObject $privateKeyFile): SignedProposal |
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{ |
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$proposalString = $proposal->serializeToString(); |
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$proposalArray = $this->signedCharStringSerializer->deserialize($proposalString); |
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$privateKey = $this->readPrivateKey($privateKeyFile); |
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$signature = $this->signData($privateKey, $proposalArray); |
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return SignedProposalFactory::fromProposal($proposal, $signature); |
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} |
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/** |
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* @param \SplFileObject $privateKeyPath |
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* @return PrivateKeyInterface |
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* |
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*/ |
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private function readPrivateKey(\SplFileObject $privateKeyPath): PrivateKeyInterface |
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{ |
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## You'll be restoring from a key, as opposed to generating one. |
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$keyData = $privateKeyPath->fread($privateKeyPath->getSize()); |
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\openssl_pkey_export($keyData, $privateKey); |
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$pemSerializer = new PemPrivateKeySerializer(new DerPrivateKeySerializer($this->adapter)); |
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return $pemSerializer->parse($privateKey); |
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} |
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/** |
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* @param PrivateKeyInterface $privateKey |
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* @param $dataArray |
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* @return string |
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* sign private key of node |
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*/ |
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private function signData(PrivateKeyInterface $privateKey, array $dataArray): string |
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{ |
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$dataString = $this->asciiCharStringSerializer->serialize($dataArray); |
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$hash = $this->hasher->makeHash($dataString, $this->generator); |
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# Derandomized signatures are not necessary, but can reduce |
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# the attack surface for a private key that is to be used often. |
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$random = RandomGeneratorFactory::getHmacRandomGenerator($privateKey, $hash, (string) $this->hashAlgorithm); |
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$randomK = $random->generate($this->generator->getOrder()); |
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$signature = $this->signer->sign($privateKey, $hash, $randomK); |
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$eccSignature = new Signature($signature->getR(), $this->getS($signature)); |
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return $this->derSignatureSerializer->serialize($eccSignature); |
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} |
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/** |
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* @param SignatureInterface $signature |
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* @return \GMP |
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*/ |
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private function getS(SignatureInterface $signature): \GMP |
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{ |
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$order = $this->generator->getOrder(); |
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$halfOrder = $this->adapter->rightShift($order, 1); |
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$s = $signature->getS(); |
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if ($this->gmpMath->cmp($s, $halfOrder) > 0) { |
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$s = $this->adapter->sub($order, $s); |
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} |
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return $s; |
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} |
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} |
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americanexpress /
hyperledger-fabric-sdk-php
