/**
* Encrypt an assertion.
*
* This function takes in a SAML2_Assertion and encrypts it if encryption of
* assertions are enabled in the metadata.
*
* @param SimpleSAML_Configuration $idpMetadata The metadata of the IdP.
* @param SimpleSAML_Configuration $spMetadata The metadata of the SP.
* @param SAML2_Assertion $assertion The assertion we are encrypting.
* @return SAML2_Assertion|SAML2_EncryptedAssertion The assertion.
*/
private static function encryptAssertion(SimpleSAML_Configuration $idpMetadata, SimpleSAML_Configuration $spMetadata, SAML2_Assertion $assertion)
{
$encryptAssertion = $spMetadata->getBoolean('assertion.encryption', NULL);
if ($encryptAssertion === NULL) {
$encryptAssertion = $idpMetadata->getBoolean('assertion.encryption', FALSE);
}
if (!$encryptAssertion) {
/* We are _not_ encrypting this assertion, and are therefore done. */
return $assertion;
}
$sharedKey = $spMetadata->getString('sharedkey', NULL);
if ($sharedKey !== NULL) {
$key = new XMLSecurityKey(XMLSecurityKey::AES128_CBC);
$key->loadKey($sharedKey);
} else {
$keys = $spMetadata->getPublicKeys('encryption', TRUE);
$key = $keys[0];
switch ($key['type']) {
case 'X509Certificate':
$pemKey = "-----BEGIN CERTIFICATE-----\n" . chunk_split($key['X509Certificate'], 64) . "-----END CERTIFICATE-----\n";
break;
default:
throw new SimpleSAML_Error_Exception('Unsupported encryption key type: ' . $key['type']);
}
/* Extract the public key from the certificate for encryption. */
$key = new XMLSecurityKey(XMLSecurityKey::RSA_OAEP_MGF1P, array('type' => 'public'));
$key->loadKey($pemKey);
}
$ea = new SAML2_EncryptedAssertion();
$ea->setAssertion($assertion, $key);
return $ea;
}
/**
* Encrypt an assertion.
*
* This function takes in a SAML2_Assertion and encrypts it if encryption of
* assertions are enabled in the metadata.
*
* @param SimpleSAML_Configuration $srcMetadata The metadata of the sender (IdP).
* @param SimpleSAML_Configuration $dstMetadata The metadata of the recipient (SP).
* @param SAML2_Assertion $assertion The assertion we are encrypting.
* @return SAML2_Assertion|SAML2_EncryptedAssertion The assertion.
*/
public static function encryptAssertion(SimpleSAML_Configuration $srcMetadata, SimpleSAML_Configuration $dstMetadata, SAML2_Assertion $assertion)
{
$encryptAssertion = $dstMetadata->getBoolean('assertion.encryption', NULL);
if ($encryptAssertion === NULL) {
$encryptAssertion = $srcMetadata->getBoolean('assertion.encryption', FALSE);
}
if (!$encryptAssertion) {
/* We are _not_ encrypting this assertion, and are therefore done. */
return $assertion;
}
$sharedKey = $dstMetadata->getString('sharedkey', NULL);
if ($sharedKey !== NULL) {
$key = new XMLSecurityKey(XMLSecurityKey::AES128_CBC);
$key->loadKey($sharedKey);
} else {
/* Find the certificate that we should use to encrypt messages to this SP. */
$certArray = SimpleSAML_Utilities::loadPublicKey($dstMetadata, TRUE);
if (!array_key_exists('PEM', $certArray)) {
throw new Exception('Unable to locate key we should use to encrypt the assertionst ' . 'to the SP: ' . var_export($dstMetadata->getString('entityid'), TRUE) . '.');
}
$pemCert = $certArray['PEM'];
/* Extract the public key from the certificate for encryption. */
$key = new XMLSecurityKey(XMLSecurityKey::RSA_1_5, array('type' => 'public'));
$key->loadKey($pemCert);
}
$ea = new SAML2_EncryptedAssertion();
$ea->setAssertion($assertion, $key);
return $ea;
}
