| 1 |
<?php |
| 2 |
|
| 3 |
declare(strict_types=1); |
| 4 |
|
| 5 |
/* |
| 6 |
* The MIT License (MIT) |
| 7 |
* |
| 8 |
* Copyright (c) 2014-2021 Spomky-Labs |
| 9 |
* |
| 10 |
* This software may be modified and distributed under the terms |
| 11 |
* of the MIT license. See the LICENSE file for details. |
| 12 |
*/ |
| 13 |
|
| 14 |
namespace Cose\Algorithm\Signature\EdDSA; |
| 15 |
|
| 16 |
use Assert\Assertion; |
| 17 |
use Cose\Algorithm\Signature\Signature; |
| 18 |
use Cose\Algorithms; |
| 19 |
use Cose\Key\Key; |
| 20 |
use Cose\Key\OkpKey; |
| 21 |
use InvalidArgumentException; |
| 22 |
use function sodium_crypto_sign_detached; |
| 23 |
use function sodium_crypto_sign_verify_detached; |
| 24 |
|
| 25 |
class EdDSA implements Signature |
| 26 |
{ |
| 27 |
public function sign(string $data, Key $key): string |
| 28 |
{ |
| 29 |
$key = $this->handleKey($key); |
| 30 |
Assertion::true($key->isPrivate(), 'The key is not private'); |
| 31 |
|
| 32 |
$x = $key->x(); |
| 33 |
$d = $key->d(); |
| 34 |
$secret = $d.$x; |
| 35 |
|
| 36 |
switch ($key->curve()) { |
| 37 |
case OkpKey::CURVE_ED25519: |
| 38 |
return sodium_crypto_sign_detached($data, $secret); |
| 39 |
default: |
| 40 |
throw new InvalidArgumentException('Unsupported curve'); |
| 41 |
} |
| 42 |
} |
| 43 |
|
| 44 |
public function verify(string $data, Key $key, string $signature): bool |
| 45 |
{ |
| 46 |
$key = $this->handleKey($key); |
| 47 |
|
| 48 |
switch ($key->curve()) { |
| 49 |
case OkpKey::CURVE_ED25519: |
| 50 |
return sodium_crypto_sign_verify_detached($signature, $data, $key->x()); |
| 51 |
default: |
| 52 |
throw new InvalidArgumentException('Unsupported curve'); |
| 53 |
} |
| 54 |
} |
| 55 |
|
| 56 |
public static function identifier(): int |
| 57 |
{ |
| 58 |
return Algorithms::COSE_ALGORITHM_EdDSA; |
| 59 |
} |
| 60 |
|
| 61 |
private function handleKey(Key $key): OkpKey |
| 62 |
{ |
| 63 |
return new OkpKey($key->getData()); |
| 64 |
} |
| 65 |
} |
| 66 |
|
