--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AES/Adler16.h	Thu Nov 27 18:40:28 2025 +0100
@@ -0,0 +1,110 @@
+//////////////////////////////////////////////////////////////////////////////
+/// \file   Adler16.h
+/// \brief Adler checksum, on 2x8 bits.
+/// \author JD Gascuel.
+/// \copyright (c) 2011-2016 JD Gascuel. All rights reserved.
+/// $Id$
+//////////////////////////////////////////////////////////////////////////////
+//
+// BSD 2-Clause License:
+//
+// 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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.
+//
+//////////////////////////////////////////////////////////////////////////////
+// HISTORY
+//  2015-07-31 Creation.
+//  2016-05-24  jDG: BSD-2 version.
+
+#ifndef ADLER16_H
+#define ADLER16_H
+
+#include <QByteArray>
+
+//////////////////////////////////////////////////////////////////////////////
+/// \brief Addler checksum, on 2xN bits.
+template <typename T>
+class AdlerTemplate
+{
+    T _a, _b;
+
+public:
+    //------------------------------------------------------------------------
+    /// \brief Initialize checksum with a given seed.
+    inline AdlerTemplate(T a, T b)
+      : _a(a), _b(b)
+    {}
+
+    //------------------------------------------------------------------------
+    /// \brief Re-initialize checksum with a given seed.
+    inline void reset(T a, T b)
+    {   _a = a;
+        _b = b;
+    }
+
+    //------------------------------------------------------------------------
+    /// \brief Hash a single byte/word
+    inline void add(int c)
+    {
+        _a += (T)(c & 0xFF);
+        _b += _a;
+    }
+
+    //------------------------------------------------------------------------
+    /// \brief Hash a block of bytes.
+    /// \note \a size is always in BYTE units.
+    inline void add(const void* buffer, size_t size)
+    {
+        for(size_t i = 0; i<size; ++i)
+            add( ((const unsigned char*)buffer)[i] );
+    }
+
+    //------------------------------------------------------------------------
+    /// \brief Hash all the byte/words for a Qt buffer.
+    inline void add(const QByteArray& buffer)
+    {
+        add(buffer.data(), buffer.size());
+    }
+
+    //------------------------------------------------------------------------
+    /// \brief Returns hash result.
+    inline T a() const { return _a; }
+    inline T b() const { return _b; }
+
+    //------------------------------------------------------------------------
+    /// Check Hash result.
+    /// \returns TRUE if has do match the given values.
+    inline bool check(T a, T b)
+    {
+        return (_a == a) && (_b == b);
+    }
+};
+
+/// \brief 2x8 bits implementation.
+typedef AdlerTemplate<unsigned char>  Adler16;
+
+/// \brief 2x16 bits implementation.
+typedef AdlerTemplate<unsigned short> Adler32;
+
+#endif // ADDLER16_H
+