Пример #1
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// See constructions/common/keygen_tools.go
func MaskEncoding(rs *common.RandomSource, surface common.Surface) func(int, int) encoding.Nibble {
	return func(position, subPosition int) encoding.Nibble {
		label := make([]byte, 16)
		label[0], label[1], label[2], label[3], label[4] = 'M', 'E', byte(position), byte(subPosition), byte(surface)

		return rs.Shuffle(label)
	}
}
Пример #2
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// See constructions/common/keygen_tools.go
func XOREncoding(rs *common.RandomSource, round int, surface common.Surface) func(int, int) encoding.Nibble {
	return func(position, gate int) encoding.Nibble {
		label := make([]byte, 16)
		label[0], label[1], label[2], label[3], label[4] = 'X', byte(round), byte(position), byte(gate), byte(surface)

		return rs.Shuffle(label)
	}
}
Пример #3
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// See constructions/common/keygen_tools.go
func RoundEncoding(rs *common.RandomSource, round int, surface common.Surface, shift func(int) int) func(int) encoding.Nibble {
	return func(position int) encoding.Nibble {
		position = 2*shift(position/2) + position%2

		label := make([]byte, 16)
		label[0], label[1], label[2], label[3] = 'R', byte(round), byte(position), byte(surface)

		return rs.Shuffle(label)
	}
}
Пример #4
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// Encodes the output of a MB^(-1) Table / the input of an XOR Table.
//
//    position: Position in the state array, counted in *bytes*.
// subPosition: Position in the MB^(-1) Table's ouptput for this byte, counted in nibbles.
func MBInverseEncoding(rs *common.RandomSource, round, position, subPosition int) encoding.Nibble {
	label := make([]byte, 16)
	label[0], label[1], label[2], label[3], label[4] = 'M', 'I', byte(round), byte(position), byte(subPosition)

	return rs.Shuffle(label)
}