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feat: Decode jwt by provide public key as string #415

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feat: Decode jwt by provide public key as string #415

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29 changes: 22 additions & 7 deletions src/JWT.php
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Original file line number Diff line number Diff line change
Expand Up @@ -68,12 +68,12 @@ class JWT
/**
* Decodes a JWT string into a PHP object.
*
* @param string $jwt The JWT
* @param Key|array<string, Key> $keyOrKeyArray The Key or associative array of key IDs (kid) to Key objects.
* If the algorithm used is asymmetric, this is the public key
* Each Key object contains an algorithm and matching key.
* Supported algorithms are 'ES384','ES256', 'HS256', 'HS384',
* 'HS512', 'RS256', 'RS384', and 'RS512'
* @param string $jwt The JWT
* @param Key|array<string, Key>|string|resource $keyOrKeyArray The Key or associative array of key IDs (kid) to Key objects.
* If the algorithm used is asymmetric, this is the public key
* Each Key object contains an algorithm and matching key.
* Supported algorithms are 'ES384','ES256', 'HS256', 'HS384',
* 'HS512', 'RS256', 'RS384', and 'RS512'
*
* @return stdClass The JWT's payload as a PHP object
*
Expand Down Expand Up @@ -122,7 +122,7 @@ public static function decode(
throw new UnexpectedValueException('Algorithm not supported');
}

$key = self::getKey($keyOrKeyArray, property_exists($header, 'kid') ? $header->kid : null);
$key = self::getOrCreateKeyInstance($keyOrKeyArray, $header);

// Check the algorithm
if (!self::constantTimeEquals($key->getAlgorithm(), $header->alg)) {
Expand Down Expand Up @@ -621,4 +621,19 @@ private static function readDER(string $der, int $offset = 0): array

return [$pos, $data];
}

private static function getOrCreateKeyInstance(array|Key $keyOrKeyArray, mixed $header): Key
{
if (
is_string($keyOrKeyArray)
|| $keyOrKeyArray instanceof OpenSSLAsymmetricKey
|| $keyOrKeyArray instanceof OpenSSLCertificate
|| is_resource($keyOrKeyArray)
) {
$key = new Key($keyOrKeyArray, $header->alg);
} else {
$key = self::getKey($keyOrKeyArray, property_exists($header, 'kid') ? $header->kid : null);
}
return $key;
}
}
15 changes: 15 additions & 0 deletions tests/JWTTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -321,6 +321,21 @@ public function testRSEncodeDecodeWithPassphrase()
$this->assertEquals($decoded, $expected);
}

public function testDecodeWithoutKid()
{
$privateKeyFile = __DIR__ . '/data/ecdsa-private.pem';
$publicKeyFile = __DIR__ . '/data/ecdsa-public.pem';
$privateKey = file_get_contents($privateKeyFile);
$payload = ['foo' => 'bar'];
$encoded = JWT::encode($payload, $privateKey, 'ES256');

// Verify decoding succeeds
$publicKey = file_get_contents($publicKeyFile);
$decoded = JWT::decode($encoded, $publicKey);

$this->assertEquals('bar', $decoded->foo);
}

/**
* @runInSeparateProcess
* @dataProvider provideEncodeDecode
Expand Down