X-Git-Url: https://gitweb.ps.run/matrix_esp_thesis/blobdiff_plain/21c6e8484b0bd05c27e5a91f2884d431926adc61..da776f86b42946715c27edd64f7558b9d5080df1:/ext/olm/src/memory.cpp

diff --git a/ext/olm/src/memory.cpp b/ext/olm/src/memory.cpp
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+++ b/ext/olm/src/memory.cpp
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+/* 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/memory.hh"
+#include "olm/memory.h"
+
+void _olm_unset(
+    void volatile * buffer, size_t buffer_length
+) {
+    olm::unset(buffer, buffer_length);
+}
+
+void olm::unset(
+    void volatile * buffer, std::size_t buffer_length
+) {
+    char volatile * pos = reinterpret_cast<char volatile *>(buffer);
+    char volatile * end = pos + buffer_length;
+    while (pos != end) {
+        *(pos++) = 0;
+    }
+}
+
+
+bool olm::is_equal(
+    std::uint8_t const * buffer_a,
+    std::uint8_t const * buffer_b,
+    std::size_t length
+) {
+    std::uint8_t volatile result = 0;
+    while (length--) {
+        result |= (*(buffer_a++)) ^ (*(buffer_b++));
+    }
+    return result == 0;
+}