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tgseclib/phpseclib/Crypt/ECDSA/Keys/PKCS1.php

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<?php
/**
* "PKCS1" (RFC5915) Formatted ECDSA Key Handler
*
* PHP version 5
*
* Used by File/X509.php
*
* Processes keys with the following headers:
*
* -----BEGIN EC PRIVATE KEY-----
* -----BEGIN EC PARAMETERS-----
*
* Technically, PKCS1 is for RSA keys, only, but we're using PKCS1 to describe
* DSA, whose format isn't really formally described anywhere, so might as well
* use it to describe this, too. PKCS1 is easier to remember than RFC5915, after
* all. I suppose this could also be named IETF but idk
*
* @category Crypt
* @package ECDSA
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2015 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib\Crypt\ECDSA\Keys;
use phpseclib\Math\Common\FiniteField\Integer;
use phpseclib\Crypt\Common\Keys\PKCS1 as Progenitor;
use phpseclib\File\ASN1;
use phpseclib\File\ASN1\Maps;
use phpseclib\Crypt\ECDSA\BaseCurves\Base as BaseCurve;
use phpseclib\Math\BigInteger;
use ParagonIE\ConstantTime\Base64;
use phpseclib\Crypt\ECDSA\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
use phpseclib\Exception\UnsupportedCurveException;
/**
* "PKCS1" (RFC5915) Formatted ECDSA Key Handler
*
* @package ECDSA
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
abstract class PKCS1 extends Progenitor
{
use Common;
/**
* Break a public or private key down into its constituent components
*
* @access public
* @param string $key
* @param string $password optional
* @return array
*/
public static function load($key, $password = '')
{
self::initialize_static_variables();
$key = parent::load($key, $password);
$decoded = ASN1::decodeBER($key);
if (empty($decoded)) {
throw new \RuntimeException('Unable to decode BER');
}
$key = ASN1::asn1map($decoded[0], Maps\ECParameters::MAP);
if (is_array($key)) {
return ['curve' => self::loadCurveByParam($key)];
}
$key = ASN1::asn1map($decoded[0], Maps\ECPrivateKey::MAP);
if (!is_array($key)) {
throw new \RuntimeException('Unable to perform ASN1 mapping');
}
$components = [];
$components['curve'] = self::loadCurveByParam($key['parameters']);
$temp = new BigInteger($key['privateKey'], 256);
$components['dA'] = $components['curve']->convertInteger($temp);
$components['QA'] = self::extractPoint($key['publicKey'], $components['curve']);
return $components;
}
/**
* Convert ECDSA parameters to the appropriate format
*
* @access public
* @return string
*/
public static function saveParameters(BaseCurve $curve, array $options = [])
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{
self::initialize_static_variables();
if ($curve instanceof TwistedEdwardsCurve) {
throw new UnsupportedCurveException('TwistedEdwards Curves are not supported');
}
$key = self::encodeParameters($curve, false, $options);
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return "-----BEGIN EC PARAMETERS-----\r\n" .
chunk_split(Base64::encode($key), 64) .
"-----END EC PARAMETERS-----\r\n";
}
/**
* Convert a private key to the appropriate format.
*
* @access public
* @param \phpseclib\Math\Common\FiniteField\Integer $privateKey
* @param \phpseclib\Crypt\ECDSA\BaseCurves\Base $curve
* @param \phpseclib\Math\Common\FiniteField\Integer[] $publicKey
* @param string $password optional
* @param array $options optional
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* @return string
*/
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public static function savePrivateKey(Integer $privateKey, BaseCurve $curve, array $publicKey, $password = '', array $options = [])
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{
self::initialize_static_variables();
if ($curve instanceof TwistedEdwardsCurve) {
throw new UnsupportedCurveException('TwistedEdwards Curves are not supported');
}
$publicKey = "\4" . $publicKey[0]->toBytes() . $publicKey[1]->toBytes();
$key = [
'version' => 'ecPrivkeyVer1',
'privateKey' => $privateKey->toBytes(),
'parameters' => new ASN1\Element(self::encodeParameters($curve)),
'publicKey' => "\0" . $publicKey
];
$key = ASN1::encodeDER($key, Maps\ECPrivateKey::MAP);
return self::wrapPrivateKey($key, 'EC', $password, $options);
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}
}