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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2019 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Component\Core\Util; |
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use Base64Url\Base64Url; |
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use InvalidArgumentException; |
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use Jose\Component\Core\JWK; |
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use RuntimeException; |
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/** |
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* @internal |
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*/ |
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class ECKey |
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{ |
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public static function convertToPEM(JWK $jwk): string |
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{ |
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if ($jwk->has('d')) { |
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return self::convertPrivateKeyToPEM($jwk); |
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} |
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return self::convertPublicKeyToPEM($jwk); |
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} |
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public static function convertPublicKeyToPEM(JWK $jwk): string |
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{ |
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switch ($jwk->get('crv')) { |
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case 'P-256': |
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$der = self::p256PublicKey(); |
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break; |
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case 'secp256k1': |
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$der = self::p256KPublicKey(); |
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break; |
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case 'P-384': |
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$der = self::p384PublicKey(); |
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break; |
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case 'P-521': |
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$der = self::p521PublicKey(); |
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break; |
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default: |
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throw new InvalidArgumentException('Unsupported curve.'); |
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} |
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$der .= self::getKey($jwk); |
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$pem = '-----BEGIN PUBLIC KEY-----'.PHP_EOL; |
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$pem .= chunk_split(base64_encode($der), 64, PHP_EOL); |
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$pem .= '-----END PUBLIC KEY-----'.PHP_EOL; |
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return $pem; |
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} |
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public static function convertPrivateKeyToPEM(JWK $jwk): string |
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{ |
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switch ($jwk->get('crv')) { |
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case 'P-256': |
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$der = self::p256PrivateKey($jwk); |
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break; |
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case 'secp256k1': |
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$der = self::p256KPrivateKey($jwk); |
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break; |
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case 'P-384': |
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$der = self::p384PrivateKey($jwk); |
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break; |
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case 'P-521': |
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$der = self::p521PrivateKey($jwk); |
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break; |
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default: |
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throw new InvalidArgumentException('Unsupported curve.'); |
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} |
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$der .= self::getKey($jwk); |
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$pem = '-----BEGIN EC PRIVATE KEY-----'.PHP_EOL; |
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$pem .= chunk_split(base64_encode($der), 64, PHP_EOL); |
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$pem .= '-----END EC PRIVATE KEY-----'.PHP_EOL; |
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return $pem; |
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} |
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/** |
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* Creates a EC key with the given curve and additional values. |
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* |
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* @param string $curve The curve |
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* @param array $values values to configure the key |
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*/ |
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public static function createECKey(string $curve, array $values = []): JWK |
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{ |
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$jwk = self::createECKeyUsingOpenSSL($curve); |
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$values = array_merge($values, $jwk); |
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return new JWK($values); |
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} |
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private static function getNistCurveSize(string $curve): int |
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{ |
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switch ($curve) { |
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case 'P-256': |
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case 'secp256k1': |
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return 256; |
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case 'P-384': |
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return 384; |
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case 'P-521': |
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return 521; |
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default: |
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throw new InvalidArgumentException(sprintf('The curve "%s" is not supported.', $curve)); |
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} |
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} |
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private static function createECKeyUsingOpenSSL(string $curve): array |
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{ |
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$key = openssl_pkey_new([ |
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'curve_name' => self::getOpensslCurveName($curve), |
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'private_key_type' => OPENSSL_KEYTYPE_EC, |
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]); |
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if (false === $key) { |
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throw new RuntimeException('Unable to create the key'); |
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} |
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$result = openssl_pkey_export($key, $out); |
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if (false === $result) { |
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throw new RuntimeException('Unable to create the key'); |
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} |
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$res = openssl_pkey_get_private($out); |
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if (false === $res) { |
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throw new RuntimeException('Unable to create the key'); |
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} |
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$details = openssl_pkey_get_details($res); |
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$nistCurveSize = self::getNistCurveSize($curve); |
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return [ |
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'kty' => 'EC', |
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'crv' => $curve, |
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'd' => Base64Url::encode(str_pad($details['ec']['d'], (int) ceil($nistCurveSize / 8), "\0", STR_PAD_LEFT)), |
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'x' => Base64Url::encode(str_pad($details['ec']['x'], (int) ceil($nistCurveSize / 8), "\0", STR_PAD_LEFT)), |
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'y' => Base64Url::encode(str_pad($details['ec']['y'], (int) ceil($nistCurveSize / 8), "\0", STR_PAD_LEFT)), |
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]; |
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} |
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private static function getOpensslCurveName(string $curve): string |
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{ |
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switch ($curve) { |
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case 'P-256': |
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return 'prime256v1'; |
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case 'secp256k1': |
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return 'secp256k1'; |
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case 'P-384': |
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return 'secp384r1'; |
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case 'P-521': |
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return 'secp521r1'; |
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default: |
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throw new InvalidArgumentException(sprintf('The curve "%s" is not supported.', $curve)); |
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} |
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} |
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private static function p256PublicKey(): string |
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{ |
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return pack( |
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'H*', |
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'3059' // SEQUENCE, length 89 |
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.'3013' // SEQUENCE, length 19 |
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.'0607' // OID, length 7 |
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.'2a8648ce3d0201' // 1.2.840.10045.2.1 = EC Public Key |
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.'0608' // OID, length 8 |
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.'2a8648ce3d030107' // 1.2.840.10045.3.1.7 = P-256 Curve |
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.'0342' // BIT STRING, length 66 |
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.'00' // prepend with NUL - pubkey will follow |
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); |
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} |
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private static function p256KPublicKey(): string |
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{ |
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return pack( |
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'H*', |
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'3056' // SEQUENCE, length 86 |
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.'3010' // SEQUENCE, length 16 |
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.'0607' // OID, length 7 |
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.'2a8648ce3d0201' // 1.2.840.10045.2.1 = EC Public Key |
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.'0605' // OID, length 8 |
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.'2B8104000A' // 1.3.132.0.10 secp256k1 |
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.'0342' // BIT STRING, length 66 |
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.'00' // prepend with NUL - pubkey will follow |
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); |
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} |
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private static function p384PublicKey(): string |
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{ |
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return pack( |
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'H*', |
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'3076' // SEQUENCE, length 118 |
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.'3010' // SEQUENCE, length 16 |
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.'0607' // OID, length 7 |
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.'2a8648ce3d0201' // 1.2.840.10045.2.1 = EC Public Key |
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.'0605' // OID, length 5 |
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.'2b81040022' // 1.3.132.0.34 = P-384 Curve |
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.'0362' // BIT STRING, length 98 |
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.'00' // prepend with NUL - pubkey will follow |
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); |
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} |
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private static function p521PublicKey(): string |
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{ |
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return pack( |
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'H*', |
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'30819b' // SEQUENCE, length 154 |
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.'3010' // SEQUENCE, length 16 |
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.'0607' // OID, length 7 |
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.'2a8648ce3d0201' // 1.2.840.10045.2.1 = EC Public Key |
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.'0605' // OID, length 5 |
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.'2b81040023' // 1.3.132.0.35 = P-521 Curve |
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.'038186' // BIT STRING, length 134 |
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.'00' // prepend with NUL - pubkey will follow |
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); |
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} |
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private static function p256PrivateKey(JWK $jwk): string |
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{ |
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$d = unpack('H*', str_pad(Base64Url::decode($jwk->get('d')), 32, "\0", STR_PAD_LEFT))[1]; |
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return pack( |
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'H*', |
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'3077' // SEQUENCE, length 87+length($d)=32 |
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.'020101' // INTEGER, 1 |
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.'0420' // OCTET STRING, length($d) = 32 |
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.$d |
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.'a00a' // TAGGED OBJECT #0, length 10 |
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.'0608' // OID, length 8 |
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.'2a8648ce3d030107' // 1.3.132.0.34 = P-256 Curve |
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.'a144' // TAGGED OBJECT #1, length 68 |
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.'0342' // BIT STRING, length 66 |
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.'00' // prepend with NUL - pubkey will follow |
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); |
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} |
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private static function p256KPrivateKey(JWK $jwk): string |
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{ |
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$d = unpack('H*', str_pad(Base64Url::decode($jwk->get('d')), 32, "\0", STR_PAD_LEFT))[1]; |
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return pack( |
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'H*', |
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'3074' // SEQUENCE, length 84+length($d)=32 |
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.'020101' // INTEGER, 1 |
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.'0420' // OCTET STRING, length($d) = 32 |
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.$d |
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.'a007' // TAGGED OBJECT #0, length 7 |
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.'0605' // OID, length 5 |
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.'2b8104000a' // 1.3.132.0.10 secp256k1 |
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.'a144' // TAGGED OBJECT #1, length 68 |
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.'0342' // BIT STRING, length 66 |
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.'00' // prepend with NUL - pubkey will follow |
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); |
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} |
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private static function p384PrivateKey(JWK $jwk): string |
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{ |
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$d = unpack('H*', str_pad(Base64Url::decode($jwk->get('d')), 48, "\0", STR_PAD_LEFT))[1]; |
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return pack( |
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'H*', |
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'3081a4' // SEQUENCE, length 116 + length($d)=48 |
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.'020101' // INTEGER, 1 |
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.'0430' // OCTET STRING, length($d) = 30 |
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.$d |
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.'a007' // TAGGED OBJECT #0, length 7 |
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.'0605' // OID, length 5 |
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.'2b81040022' // 1.3.132.0.34 = P-384 Curve |
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.'a164' // TAGGED OBJECT #1, length 100 |
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.'0362' // BIT STRING, length 98 |
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.'00' // prepend with NUL - pubkey will follow |
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); |
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} |
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private static function p521PrivateKey(JWK $jwk): string |
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{ |
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$d = unpack('H*', str_pad(Base64Url::decode($jwk->get('d')), 66, "\0", STR_PAD_LEFT))[1]; |
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return pack( |
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'H*', |
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'3081dc' // SEQUENCE, length 154 + length($d)=66 |
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.'020101' // INTEGER, 1 |
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.'0442' // OCTET STRING, length(d) = 66 |
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.$d |
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.'a007' // TAGGED OBJECT #0, length 7 |
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.'0605' // OID, length 5 |
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.'2b81040023' // 1.3.132.0.35 = P-521 Curve |
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.'a18189' // TAGGED OBJECT #1, length 137 |
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.'038186' // BIT STRING, length 134 |
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.'00' // prepend with NUL - pubkey will follow |
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); |
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} |
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private static function getKey(JWK $jwk): string |
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{ |
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$nistCurveSize = self::getNistCurveSize($jwk->get('crv')); |
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$length = (int) ceil($nistCurveSize / 8); |
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return |
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"\04" |
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.str_pad(Base64Url::decode($jwk->get('x')), $length, "\0", STR_PAD_LEFT) |
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.str_pad(Base64Url::decode($jwk->get('y')), $length, "\0", STR_PAD_LEFT); |
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} |
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} |
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