/// <summary> /// Finalizes SHA-512 hashing /// </summary> /// <param name="output">Output buffer</param> public void Finalize(ArraySegment <byte> output) { Contract.Requires <ArgumentNullException>(output.Array != null); Contract.Requires <ArgumentException>(output.Count == 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>); }
/// <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) { Contract.Requires <ArgumentNullException>(data != null); Contract.Requires <ArgumentOutOfRangeException>(index >= 0 && length >= 0); Contract.Requires <ArgumentException>((index + length) <= data.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); } }