From da776f86b42946715c27edd64f7558b9d5080df1 Mon Sep 17 00:00:00 2001
From: patrick-scho
Date: Mon, 13 Nov 2023 19:58:33 +0100
Subject: add dependencies to repo

---
 ext/olm/src/utility.cpp | 57 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 ext/olm/src/utility.cpp

(limited to 'ext/olm/src/utility.cpp')

diff --git a/ext/olm/src/utility.cpp b/ext/olm/src/utility.cpp
new file mode 100644
index 0000000..b6bb56e
--- /dev/null
+++ b/ext/olm/src/utility.cpp
@@ -0,0 +1,57 @@
+/* Copyright 2015 OpenMarket Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "olm/utility.hh"
+#include "olm/crypto.h"
+
+
+olm::Utility::Utility(
+) : last_error(OlmErrorCode::OLM_SUCCESS) {
+}
+
+
+size_t olm::Utility::sha256_length() const {
+    return SHA256_OUTPUT_LENGTH;
+}
+
+
+size_t olm::Utility::sha256(
+    std::uint8_t const * input, std::size_t input_length,
+    std::uint8_t * output, std::size_t output_length
+) {
+    if (output_length < sha256_length()) {
+        last_error = OlmErrorCode::OLM_OUTPUT_BUFFER_TOO_SMALL;
+        return std::size_t(-1);
+    }
+    _olm_crypto_sha256(input, input_length, output);
+    return SHA256_OUTPUT_LENGTH;
+}
+
+
+size_t olm::Utility::ed25519_verify(
+    _olm_ed25519_public_key const & key,
+    std::uint8_t const * message, std::size_t message_length,
+    std::uint8_t const * signature, std::size_t signature_length
+) {
+    if (signature_length < ED25519_SIGNATURE_LENGTH) {
+        last_error = OlmErrorCode::OLM_BAD_MESSAGE_MAC;
+        return std::size_t(-1);
+    }
+    if (!_olm_crypto_ed25519_verify(&key, message, message_length, signature)) {
+        last_error = OlmErrorCode::OLM_BAD_MESSAGE_MAC;
+        return std::size_t(-1);
+    }
+    return std::size_t(0);
+}
-- 
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