Example #1
0
        public void Update(byte[] data, int offset, int count)
        {
            if (data == null)
            {
                throw new ArgumentNullException("data");
            }
            if (offset < 0)
            {
                throw new ArgumentOutOfRangeException("offset");
            }
            if (count < 0)
            {
                throw new ArgumentOutOfRangeException("count");
            }
            if (data.Length - offset < count)
            {
                throw new ArgumentException("Requires offset + count <= data.Length");
            }

            Array16 <ulong> block;
            int             bytesInBuffer = (int)_totalBytes & (BlockSize - 1);

            _totalBytes += (uint)count;

            if (_totalBytes >= ulong.MaxValue / 8)
            {
                throw new InvalidOperationException("Too much data");
            }
            // Fill existing buffer
            if (bytesInBuffer != 0)
            {
                var toCopy = Math.Min(BlockSize - bytesInBuffer, count);
                Buffer.BlockCopy(data, offset, _buffer, bytesInBuffer, toCopy);
                offset        += toCopy;
                count         -= toCopy;
                bytesInBuffer += toCopy;
                if (bytesInBuffer == BlockSize)
                {
                    ByteIntegerConverter.Array16LoadBigEndian64(out block, _buffer, 0);
                    Sha512Internal.Core(out _state, ref _state, ref block);
                    CryptoBytes.InternalWipe(_buffer, 0, _buffer.Length);
                    bytesInBuffer = 0;
                }
            }
            // Hash complete blocks without copying
            while (count >= BlockSize)
            {
                ByteIntegerConverter.Array16LoadBigEndian64(out block, data, offset);
                Sha512Internal.Core(out _state, ref _state, ref block);
                offset += BlockSize;
                count  -= BlockSize;
            }
            // Copy remainder into buffer
            if (count > 0)
            {
                Buffer.BlockCopy(data, offset, _buffer, bytesInBuffer, count);
            }
        }
Example #2
0
        public void Finish(ArraySegment <byte> output)
        {
            if (output.Array == null)
            {
                throw new ArgumentNullException("output.Array");
            }
            if (output.Count != 64)
            {
                throw new ArgumentException("output.Count must be 64");
            }

            Update(_padding, 0, _padding.Length);
            Array16 <ulong> block;

            ByteIntegerConverter.Array16LoadBigEndian64(out block, _buffer, 0);
            CryptoBytes.InternalWipe(_buffer, 0, _buffer.Length);
            int bytesInBuffer = (int)_totalBytes & (BlockSize - 1);

            if (bytesInBuffer > BlockSize - 16)
            {
                Sha512Internal.Core(out _state, ref _state, ref block);
                block = default(Array16 <ulong>);
            }
            block.x15 = (_totalBytes - 1) * 8;
            Sha512Internal.Core(out _state, ref _state, ref block);

            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 0, _state.x0);
            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 8, _state.x1);
            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 16, _state.x2);
            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 24, _state.x3);
            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 32, _state.x4);
            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 40, _state.x5);
            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 48, _state.x6);
            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 56, _state.x7);
            _state = default(Array8 <ulong>);
        }