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07c3cdd | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | <?php
namespace OAuth2\Encryption;
/**
* @link https://github.com/F21/jwt
* @author F21
*/
class Jwt
{
public function encode($payload, $key, $algo = 'HS256')
{
$header = array('typ' => 'JWT', 'alg' => $algo);
$segments = array(
$this->urlsafeB64Encode(json_encode($header)),
$this->urlsafeB64Encode(json_encode($payload))
);
$signing_input = implode('.', $segments);
$signature = $this->sign($signing_input, $key, $algo);
$segments[] = $this->urlsafeB64Encode($signature);
return implode('.', $segments);
}
public function decode($jwt, $key = null, $verify = true)
{
$tks = explode('.', $jwt);
if (count($tks) != 3) {
return false;
}
list($headb64, $payloadb64, $cryptob64) = $tks;
if (null === ($header = json_decode($this->urlsafeB64Decode($headb64), true))) {
return false;
}
if (null === $payload = json_decode($this->urlsafeB64Decode($payloadb64), true)) {
return false;
}
$sig = $this->urlsafeB64Decode($cryptob64);
if ($verify) {
if (!isset($header['alg'])) {
return false;
}
if (!$this->verifySignature($sig, "$headb64.$payloadb64", $key, $header['alg'])) {
return false;
}
}
return $payload;
}
private function verifySignature($signature, $input, $key, $algo = 'HS256')
{
switch($algo){
case'HS256':
case'HS384':
case'HS512':
return $this->sign($input, $key, $algo) === $signature;
case 'RS256':
return openssl_verify($input, $signature, $key, 'sha256') === 1;
case 'RS384':
return @openssl_verify($input, $signature, $key, 'sha384') === 1;
case 'RS512':
return @openssl_verify($input, $signature, $key, 'sha512') === 1;
default:
throw new \InvalidArgumentException("Unsupported or invalid signing algorithm.");
}
}
private function sign($input, $key, $algo = 'HS256')
{
switch($algo){
case 'HS256':
return hash_hmac('sha256', $input, $key, true);
case 'HS384':
return hash_hmac('sha384', $input, $key, true);
case 'HS512':
return hash_hmac('sha512', $input, $key, true);
case 'RS256':
return $this->generateRSASignature($input, $key, 'sha256');
case 'RS384':
return $this->generateRSASignature($input, $key, 'sha384');
case 'RS512':
return $this->generateRSASignature($input, $key, 'sha512');
default:
throw new \Exception("Unsupported or invalid signing algorithm.");
}
}
private function generateRSASignature($input, $key, $algo)
{
if (!openssl_sign($input, $signature, $key, $algo)) {
throw new \Exception("Unable to sign data.");
}
return $signature;
}
private function urlSafeB64Encode($data)
{
$b64 = base64_encode($data);
$b64 = str_replace(array('+', '/', '\r', '\n', '='),
array('-', '_'),
$b64);
return $b64;
}
private function urlSafeB64Decode($b64)
{
$b64 = str_replace(array('-', '_'),
array('+', '/'),
$b64);
return base64_decode($b64);
}
}
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