+
+void Decrypter::decryptData(ostream& out, const EncryptedData& encryptedData, const XMLCh* recipient)
+{
+ if (!m_credResolver)
+ throw DecryptionException("No CredentialResolver supplied to provide decryption keys.");
+
+ // Resolve a decryption key directly.
+ vector<const Credential*> creds;
+ int types = CredentialCriteria::KEYINFO_EXTRACTION_KEY | CredentialCriteria::KEYINFO_EXTRACTION_KEYNAMES;
+ if (m_criteria) {
+ m_criteria->setUsage(Credential::ENCRYPTION_CREDENTIAL);
+ m_criteria->setKeyInfo(encryptedData.getKeyInfo(), types);
+ const EncryptionMethod* meth = encryptedData.getEncryptionMethod();
+ if (meth)
+ m_criteria->setXMLAlgorithm(meth->getAlgorithm());
+ m_credResolver->resolve(creds,m_criteria);
+ }
+ else {
+ CredentialCriteria criteria;
+ criteria.setUsage(Credential::ENCRYPTION_CREDENTIAL);
+ criteria.setKeyInfo(encryptedData.getKeyInfo(), types);
+ const EncryptionMethod* meth = encryptedData.getEncryptionMethod();
+ if (meth)
+ criteria.setXMLAlgorithm(meth->getAlgorithm());
+ m_credResolver->resolve(creds,&criteria);
+ }
+
+ // Loop over them and try each one.
+ XSECCryptoKey* key;
+ for (vector<const Credential*>::const_iterator cred = creds.begin(); cred!=creds.end(); ++cred) {
+ try {
+ key = (*cred)->getPrivateKey();
+ if (!key)
+ continue;
+ return decryptData(out, encryptedData, key);
+ }
+ catch(DecryptionException& ex) {
+ logging::Category::getInstance(XMLTOOLING_LOGCAT".Decrypter").warn(ex.what());
+ }
+ }
+
+ // We need to find an encrypted decryption key somewhere. We'll need the underlying algorithm...
+ const XMLCh* algorithm=
+ encryptedData.getEncryptionMethod() ? encryptedData.getEncryptionMethod()->getAlgorithm() : nullptr;
+ if (!algorithm)
+ throw DecryptionException("No EncryptionMethod/@Algorithm set, key decryption cannot proceed.");
+
+ // Check for external resolver.
+ const EncryptedKey* encKey=nullptr;
+ if (m_EKResolver)
+ encKey = m_EKResolver->resolveKey(encryptedData, recipient);
+ else {
+ EncryptedKeyResolver ekr;
+ encKey = ekr.resolveKey(encryptedData, recipient);
+ }
+
+ if (!encKey)
+ throw DecryptionException("Unable to locate an encrypted key.");
+
+ auto_ptr<XSECCryptoKey> keywrapper(decryptKey(*encKey, algorithm));
+ if (!keywrapper.get())
+ throw DecryptionException("Unable to decrypt the encrypted key.");
+ decryptData(out, encryptedData, keywrapper.get());
+}
+
+XSECCryptoKey* Decrypter::decryptKey(const EncryptedKey& encryptedKey, const XMLCh* algorithm)
+{
+ if (!m_credResolver)
+ throw DecryptionException("No CredentialResolver supplied to provide decryption keys.");
+
+ if (encryptedKey.getDOM()==nullptr)
+ throw DecryptionException("The object must be marshalled before decryption.");
+
+ XSECAlgorithmHandler* handler;
+ try {
+ handler = XSECPlatformUtils::g_algorithmMapper->mapURIToHandler(algorithm);
+ if (!handler)
+ throw DecryptionException("Unrecognized algorithm, no way to build object around decrypted key.");
+ }
+ catch(XSECException& e) {
+ auto_ptr_char temp(e.getMsg());
+ throw DecryptionException(string("XMLSecurity exception while decrypting key: ") + temp.get());
+ }
+ catch(XSECCryptoException& e) {
+ throw DecryptionException(string("XMLSecurity exception while decrypting key: ") + e.getMsg());
+ }
+
+ // We can reuse the cipher object if the document hasn't changed.
+
+ if (m_cipher && m_cipher->getDocument()!=encryptedKey.getDOM()->getOwnerDocument()) {
+ XMLToolingInternalConfig::getInternalConfig().m_xsecProvider->releaseCipher(m_cipher);
+ m_cipher=nullptr;
+ }
+
+ if (!m_cipher)
+ m_cipher=XMLToolingInternalConfig::getInternalConfig().m_xsecProvider->newCipher(encryptedKey.getDOM()->getOwnerDocument());
+
+ // Resolve key decryption keys.
+ int types = CredentialCriteria::KEYINFO_EXTRACTION_KEY | CredentialCriteria::KEYINFO_EXTRACTION_KEYNAMES;
+ vector<const Credential*> creds;
+ if (m_criteria) {
+ m_criteria->setUsage(Credential::ENCRYPTION_CREDENTIAL);
+ m_criteria->setKeyInfo(encryptedKey.getKeyInfo(), types);
+ const EncryptionMethod* meth = encryptedKey.getEncryptionMethod();
+ if (meth)
+ m_criteria->setXMLAlgorithm(meth->getAlgorithm());
+ m_credResolver->resolve(creds, m_criteria);
+ }
+ else {
+ CredentialCriteria criteria;
+ criteria.setUsage(Credential::ENCRYPTION_CREDENTIAL);
+ criteria.setKeyInfo(encryptedKey.getKeyInfo(), types);
+ const EncryptionMethod* meth = encryptedKey.getEncryptionMethod();
+ if (meth)
+ criteria.setXMLAlgorithm(meth->getAlgorithm());
+ m_credResolver->resolve(creds, &criteria);
+ }
+ if (creds.empty())
+ throw DecryptionException("Unable to resolve any key decryption keys.");
+
+ XMLByte buffer[1024];
+ for (vector<const Credential*>::const_iterator cred = creds.begin(); cred!=creds.end(); ++cred) {
+ try {
+ if (!(*cred)->getPrivateKey())
+ throw DecryptionException("Credential did not contain a private key.");
+ memset(buffer,0,sizeof(buffer));
+ m_cipher->setKEK((*cred)->getPrivateKey()->clone());
+
+ try {
+ int keySize = m_cipher->decryptKey(encryptedKey.getDOM(), buffer, 1024);
+ if (keySize<=0)
+ throw DecryptionException("Unable to decrypt key.");
+
+ // Try to wrap the key.
+ return handler->createKeyForURI(algorithm, buffer, keySize);
+ }
+ catch(XSECException& e) {
+ auto_ptr_char temp(e.getMsg());
+ throw DecryptionException(string("XMLSecurity exception while decrypting key: ") + temp.get());
+ }
+ catch(XSECCryptoException& e) {
+ throw DecryptionException(string("XMLSecurity exception while decrypting key: ") + e.getMsg());
+ }
+ }
+ catch(DecryptionException& ex) {
+ logging::Category::getInstance(XMLTOOLING_LOGCAT".Decrypter").warn(ex.what());
+ }
+ }
+
+ throw DecryptionException("Unable to decrypt key.");
+}