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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
@@ -66,6 +66,12 @@
const std::string &targetUserId,
EncryptedData encryptedData,
const OlmBuffer &theirIdentityKey);
+
+ std::string signMessage(const std::string &message);
+ static void verifySignature(
+ const std::string &publicKey,
+ const std::string &message,
+ const std::string &signature);
};
} // namespace crypto
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
@@ -302,5 +302,42 @@
return std::string{(char *)decryptedMessage.data(), decryptedSize};
}
+std::string CryptoModule::signMessage(const std::string &message) {
+ OlmBuffer signature;
+ signature.resize(::olm_account_signature_length(this->account));
+ size_t signatureLength = ::olm_account_sign(
+ this->account,
+ (uint8_t *)message.data(),
+ message.length(),
+ signature.data(),
+ signature.size());
+ if (signatureLength == -1) {
+ throw std::runtime_error{
+ "olm error: " + std::string{::olm_account_last_error(this->account)}};
+ }
+ return std::string{(char *)signature.data(), signatureLength};
+}
+
+void CryptoModule::verifySignature(
+ const std::string &publicKey,
+ const std::string &message,
+ const std::string &signature) {
+ OlmBuffer utilityBuffer;
+ utilityBuffer.resize(::olm_utility_size());
+ OlmUtility *olmUtility = ::olm_utility(utilityBuffer.data());
+ ssize_t verificationResult = ::olm_ed25519_verify(
+ olmUtility,
+ (uint8_t *)publicKey.data(),
+ publicKey.length(),
+ (uint8_t *)message.data(),
+ message.length(),
+ (uint8_t *)signature.data(),
+ signature.length());
+ if (verificationResult == -1) {
+ throw std::runtime_error{
+ "olm error: " + std::string{::olm_utility_last_error(olmUtility)}};
+ }
+}
+
} // namespace crypto
} // namespace comm

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