Golang Matrix.Composeの例

コード例 #1

ファイル: keygen.go プロジェクト: bluelikeme/AES

// generateBarriers creates the encoding barriers between rounds that compute ShiftRows and re-encodes data.
func generateBarriers(rs *common.RandomSource, out *Construction, inputMask, outputMask, sr *matrix.Matrix) {
	// Generate the ShiftRows and re-encoding matrices.
	out.ShiftRows[0] = MaskSwap(rs, 16, 0).Compose(*sr).Compose(*inputMask)

	for round := 1; round < 10; round++ {
		out.ShiftRows[round] = MaskSwap(rs, 16, round).Compose(*sr).Compose(MaskSwap(rs, 32, round-1))
	}

	// We need to apply a final matrix transformation to convert the double-level encoding to a block-level one.
	out.FinalMask = outputMask.Compose(MaskSwap(rs, 32, 9))
}