1 files changed, 44 insertions, 0 deletions
diff --git a/Source/WTF/wtf/CryptographicUtilities.cpp b/Source/WTF/wtf/CryptographicUtilities.cpp
new file mode 100644
index 000000000..600c8cec7
--- /dev/null
+++ b/Source/WTF/wtf/CryptographicUtilities.cpp
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "CryptographicUtilities.h"
+
+namespace WTF {
+
+// FIXME: Use platform APIs where available. See <rdar://problem/12685603> for Mac/iOS.
+NEVER_INLINE int constantTimeMemcmp(const void* voidA, const void* voidB, size_t length)
+{
+    const uint8_t* a = static_cast<const uint8_t*>(voidA);
+    const uint8_t* b = static_cast<const uint8_t*>(voidB);
+
+    uint8_t result = 0;
+    for (size_t i = 0; i < length; ++i)
+        result |= a[i] ^ b[i];
+
+    return result;
+}
+
+}