public function verify($signature, $data, $keys, $kid = null)
{
$key = $this->selectKey($keys, $kid, array(Key::PUBLIC_PROPERTY => true, '~use' => 'sig'));
if ($key == null) {
throw new KeyException('Key not found or is invalid');
}
$binary = Util::base64url_decode($signature);
if ($key->getKeyType() == \SimpleJWT\Keys\ECKey::KTY) {
// For ECDSA signatures, OpenSSL expects a ASN.1 DER SEQUENCE
list($r, $s) = str_split($binary, (int) (strlen($binary) / 2));
// Trim leading zeros
$r = ltrim($r, "");
$s = ltrim($s, "");
// Convert r and s from unsigned big-endian integers to signed two's complement
if (ord($r[0]) > 0x7f) {
$r = "" . $r;
}
if (ord($s[0]) > 0x7f) {
$s = "" . $s;
}
$binary = ASN1::encodeDER(ASN1::SEQUENCE, ASN1::encodeDER(ASN1::INTEGER_TYPE, $r) . ASN1::encodeDER(ASN1::INTEGER_TYPE, $s), false);
}
$result = openssl_verify($data, $binary, $key->toPEM(), 'SHA' . $this->size);
switch ($result) {
case 1:
return true;
break;
case 0:
return false;
break;
default:
$messages = array();
while ($message = openssl_error_string()) {
$messages[] = $message;
}
throw new CryptException('Cannot verify signature: ' . implode("\n", $messages));
return false;
break;
}
}
public function toPEM()
{
if ($this->isPublic()) {
$der = ASN1::encodeDER(ASN1::SEQUENCE, ASN1::encodeDER(ASN1::SEQUENCE, ASN1::encodeDER(ASN1::OID, ASN1::encodeOID(self::OID)) . ASN1::encodeDER(ASN1::NULL_TYPE), false) . ASN1::encodeDER(ASN1::BIT_STRING, chr(0x0) . ASN1::encodeDER(ASN1::SEQUENCE, ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['n'])) . ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['e'])), false)), false);
return wordwrap("-----BEGIN PUBLIC KEY-----\n" . base64_encode($der) . "\n-----END PUBLIC KEY-----\n", 64, "\n", true);
} else {
$der = ASN1::encodeDER(ASN1::SEQUENCE, ASN1::encodeDER(ASN1::INTEGER_TYPE, chr(0)) . ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['n'])) . ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['e'])) . ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['d'])) . ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['p'])) . ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['q'])) . ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['dp'])) . ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['dq'])) . ASN1::encodeDER(ASN1::INTEGER_TYPE, Util::base64url_decode($this->data['qi'])), false);
return wordwrap("-----BEGIN RSA PRIVATE KEY-----\n" . base64_encode($der) . "\n-----END RSA PRIVATE KEY-----\n", 64, "\n", true);
}
}
public function toPEM()
{
$oid = $this->getOID($this->data['crv']);
if ($oid == null) {
throw new KeyException('Unrecognised EC curve');
}
if ($this->isPublic()) {
$der = ASN1::encodeDER(ASN1::SEQUENCE, ASN1::encodeDER(ASN1::SEQUENCE, ASN1::encodeDER(ASN1::OID, ASN1::encodeOID(self::EC_OID)) . ASN1::encodeDER(ASN1::OID, ASN1::encodeOID($oid)), false) . ASN1::encodeDER(ASN1::BIT_STRING, chr(0x0) . chr(0x4) . Util::base64url_decode($this->data['x']) . Util::base64url_decode($this->data['y'])), false);
return wordwrap("-----BEGIN PUBLIC KEY-----\n" . base64_encode($der) . "\n-----END PUBLIC KEY-----\n", 64, "\n", true);
} else {
$der = ASN1::encodeDER(ASN1::SEQUENCE, ASN1::encodeDER(ASN1::INTEGER_TYPE, chr(0x1)) . ASN1::encodeDER(ASN1::OCTET_STRING, Util::base64url_decode($this->data['d'])) . ASN1::encodeDER(0x0, ASN1::encodeDER(ASN1::OID, ASN1::encodeOID($oid)), false, ASN1::CONTEXT_CLASS) . ASN1::encodeDER(0x1, ASN1::encodeDER(ASN1::BIT_STRING, chr(0x0) . chr(0x4) . Util::base64url_decode($this->data['x']) . Util::base64url_decode($this->data['y'])), false, ASN1::CONTEXT_CLASS), false);
return wordwrap("-----BEGIN EC PRIVATE KEY-----\n" . base64_encode($der) . "\n-----END EC PRIVATE KEY-----\n", 64, "\n", true);
}
}
