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<?php namespace Namshi\JOSE\Signer\OpenSSL; use phpseclib\File\ASN1; /** * Class responsible to sign inputs with the a ECDSA algorithm, after hashing it. */ abstract class ECDSA extends PublicKey { public function __construct() { if (version_compare(PHP_VERSION, '7.0.0-dev') >= 0) { throw new \InvalidArgumentException("phpseclib 1.0.0(LTS), even the latest 2.0.0, doesn't support PHP7 yet"); } } /** * {@inheritdoc} */ protected function supportsKey($key) { if (false === parent::supportsKey($key)) { return false; } // openssl_sign with EC keys was introduced in this PHP release $minVersions = array( '5.4' => '5.4.26', '5.5' => '5.5.10', '5.6' => '5.6.0', ); if (isset($minVersions[PHP_MAJOR_VERSION.'.'.PHP_MINOR_VERSION]) && version_compare(PHP_VERSION, $minVersions[PHP_MAJOR_VERSION.'.'.PHP_MINOR_VERSION], '<')) { return false; } $keyDetails = openssl_pkey_get_details($key); if (0 === preg_match('/-----BEGIN PUBLIC KEY-----([^-]+)-----END PUBLIC KEY-----/', $keyDetails['key'], $matches)) { return false; } $publicKey = trim($matches[1]); $asn1 = new ASN1(); /* * http://tools.ietf.org/html/rfc3279#section-2.2.3 * AlgorithmIdentifier ::= SEQUENCE { * algorithm OBJECT IDENTIFIER, * parameters ANY DEFINED BY algorithm OPTIONAL * } * For ECDSA Signature Algorithm: * algorithm: ansi-X9-62 => 1.2.840.10045.2.1 * parameters: id-ecSigType => 1.2.840.10045.x.y.z * */ $asnAlgorithmIdentifier = array( 'type' => ASN1::TYPE_SEQUENCE, 'children' => array( 'ansi-X9-62' => array( 'type' => ASN1::TYPE_OBJECT_IDENTIFIER, ), 'id-ecSigType' => array( 'type' => ASN1::TYPE_OBJECT_IDENTIFIER, ), ), ); /* * http://tools.ietf.org/html/rfc5280#section-4.1 * SubjectPublicKeyInfo ::= SEQUENCE { * algorithm AlgorithmIdentifier, * subjectPublicKey BIT STRING * } */ $asnSubjectPublicKeyInfo = array( 'type' => ASN1::TYPE_SEQUENCE, 'children' => array( 'algorithm' => $asnAlgorithmIdentifier, 'subjectPublicKey' => array( 'type' => ASN1::TYPE_BIT_STRING, ), ), ); $decoded = $asn1->decodeBER(base64_decode($publicKey)); $mappedDetails = $asn1->asn1map($decoded[0], $asnSubjectPublicKeyInfo); return isset($mappedDetails['algorithm']['id-ecSigType']) ? $this->getSupportedECDSACurve() === $mappedDetails['algorithm']['id-ecSigType'] : false; } /** * {@inheritdoc} */ protected function getSupportedPrivateKeyType() { return defined('OPENSSL_KEYTYPE_EC') ? OPENSSL_KEYTYPE_EC : false; } /** * Returns the ECDSA curve supported in this signer. * * @return string */ abstract protected function getSupportedECDSACurve(); }
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