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diff --git a/native/cpp/CommonCpp/CryptoTools/CryptoModule.h b/native/cpp/CommonCpp/CryptoTools/CryptoModule.h
--- a/native/cpp/CommonCpp/CryptoTools/CryptoModule.h
+++ b/native/cpp/CommonCpp/CryptoTools/CryptoModule.h
@@ -77,6 +77,9 @@
encrypt(const std::string &targetDeviceId, const std::string &content);
std::string
decrypt(const std::string &targetDeviceId, EncryptedData &encryptedData);
+ std::string decryptSequential(
+ const std::string &targetDeviceId,
+ EncryptedData &encryptedData);
std::string signMessage(const std::string &message);
static void verifySignature(
diff --git a/native/cpp/CommonCpp/CryptoTools/CryptoModule.cpp b/native/cpp/CommonCpp/CryptoTools/CryptoModule.cpp
--- a/native/cpp/CommonCpp/CryptoTools/CryptoModule.cpp
+++ b/native/cpp/CommonCpp/CryptoTools/CryptoModule.cpp
@@ -414,6 +414,16 @@
return this->sessions.at(targetDeviceId)->decrypt(encryptedData);
}
+std::string CryptoModule::decryptSequential(
+ const std::string &targetDeviceId,
+ EncryptedData &encryptedData) {
+ if (!this->hasSessionFor(targetDeviceId)) {
+ throw std::runtime_error{
+ "error decrypt sequential => uninitialized session"};
+ }
+ return this->sessions.at(targetDeviceId)->decryptSequential(encryptedData);
+}
+
std::string CryptoModule::signMessage(const std::string &message) {
OlmBuffer signature;
signature.resize(::olm_account_signature_length(this->getOlmAccount()));
diff --git a/native/cpp/CommonCpp/CryptoTools/Session.h b/native/cpp/CommonCpp/CryptoTools/Session.h
--- a/native/cpp/CommonCpp/CryptoTools/Session.h
+++ b/native/cpp/CommonCpp/CryptoTools/Session.h
@@ -32,6 +32,7 @@
restoreFromB64(const std::string &secretKey, OlmBuffer &b64);
OlmSession *getOlmSession();
std::string decrypt(EncryptedData &encryptedData);
+ std::string decryptSequential(EncryptedData &encryptedData);
int getVersion();
void setVersion(int newVersion);
};
diff --git a/native/cpp/CommonCpp/CryptoTools/Session.cpp b/native/cpp/CommonCpp/CryptoTools/Session.cpp
--- a/native/cpp/CommonCpp/CryptoTools/Session.cpp
+++ b/native/cpp/CommonCpp/CryptoTools/Session.cpp
@@ -157,6 +157,51 @@
return std::string{(char *)decryptedMessage.data(), decryptedSize};
}
+std::string Session::decryptSequential(EncryptedData &encryptedData) {
+ OlmSession *session = this->getOlmSession();
+
+ OlmBuffer utilityBuffer(::olm_utility_size());
+ OlmUtility *olmUtility = ::olm_utility(utilityBuffer.data());
+
+ OlmBuffer messageHashBuffer(::olm_sha256_length(olmUtility));
+ ::olm_sha256(
+ olmUtility,
+ encryptedData.message.data(),
+ encryptedData.message.size(),
+ messageHashBuffer.data(),
+ messageHashBuffer.size());
+
+ OlmBuffer tmpEncryptedMessage(encryptedData.message);
+ size_t maxSize = ::olm_decrypt_max_plaintext_length(
+ session,
+ encryptedData.messageType,
+ tmpEncryptedMessage.data(),
+ tmpEncryptedMessage.size());
+
+ if (maxSize == -1) {
+ throw std::runtime_error{
+ "error decrypt_max_plaintext_length => " +
+ std::string{::olm_session_last_error(session)} + ". Hash: " +
+ std::string{messageHashBuffer.begin(), messageHashBuffer.end()}};
+ }
+
+ OlmBuffer decryptedMessage(maxSize);
+ size_t decryptedSize = ::olm_decrypt_sequential(
+ session,
+ encryptedData.messageType,
+ encryptedData.message.data(),
+ encryptedData.message.size(),
+ decryptedMessage.data(),
+ decryptedMessage.size());
+ if (decryptedSize == -1) {
+ throw std::runtime_error{
+ "error decrypt_sequential => " +
+ std::string{::olm_session_last_error(session)} + ". Hash: " +
+ std::string{messageHashBuffer.begin(), messageHashBuffer.end()}};
+ }
+ return std::string{(char *)decryptedMessage.data(), decryptedSize};
+}
+
int Session::getVersion() {
return this->version;
}

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