Exemple #1
0
        /// <summary>
        /// Finalizes SHA-512 hashing
        /// </summary>
        /// <param name="output">Output buffer</param>
        public void Finalize(ArraySegment <byte> output)
        {
            Preconditions.NotNull(output.Array, nameof(output));
            if (output.Count != 64)
            {
                throw new ArgumentException("Output should be 64 in length");
            }

            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>);
        }
Exemple #2
0
        /// <summary>
        /// Updates internal state with data from the provided array.
        /// </summary>
        /// <param name="data">Array of bytes</param>
        /// <param name="index">Offset of byte sequence</param>
        /// <param name="length">Sequence length</param>
        public void Update(byte[] data, int index, int length)
        {
            Array16 <ulong> block;
            int             bytesInBuffer = (int)_totalBytes & (BlockSize - 1);

            _totalBytes += (uint)length;

            if (_totalBytes >= ulong.MaxValue / 8)
            {
                throw new InvalidOperationException("Too much data");
            }
            // Fill existing buffer
            if (bytesInBuffer != 0)
            {
                var toCopy = Math.Min(BlockSize - bytesInBuffer, length);
                Buffer.BlockCopy(data, index, _buffer, bytesInBuffer, toCopy);
                index         += toCopy;
                length        -= 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 (length >= BlockSize)
            {
                ByteIntegerConverter.Array16LoadBigEndian64(out block, data, index);
                Sha512Internal.Core(out _state, ref _state, ref block);
                index  += BlockSize;
                length -= BlockSize;
            }
            // Copy remainder into buffer
            if (length > 0)
            {
                Buffer.BlockCopy(data, index, _buffer, bytesInBuffer, length);
            }
        }