keccak256-circom/go-keccak256-bits-impl/stepmappingsRef.go

/*
This file contains the byte & uint64 implementations that are used as reference
to test the bits implementations of the other files.

The methods in this file (thetaU64Version, rhopiU64Version, chiU64Version,
iotU64Version) are modified versions of methods from: https://github.com/ebfe/keccak
*/
package keccak

func thetaU64Version(a [25]uint64) [25]uint64 {
	var c0, c1, c2, c3, c4, d uint64
	var r [25]uint64
	c0 = a[0] ^ a[5] ^ a[10] ^ a[15] ^ a[20]
	c1 = a[1] ^ a[6] ^ a[11] ^ a[16] ^ a[21]
	c2 = a[2] ^ a[7] ^ a[12] ^ a[17] ^ a[22]
	c3 = a[3] ^ a[8] ^ a[13] ^ a[18] ^ a[23]
	c4 = a[4] ^ a[9] ^ a[14] ^ a[19] ^ a[24]

	d = c4 ^ (c1<<1 | c1>>(64-1))
	r[0] = a[0] ^ d
	r[5] = a[5] ^ d
	r[10] = a[10] ^ d
	r[15] = a[15] ^ d
	r[20] = a[20] ^ d

	d = c0 ^ (c2<<1 | c2>>(64-1))
	r[1] = a[1] ^ d
	r[6] = a[6] ^ d
	r[11] = a[11] ^ d
	r[16] = a[16] ^ d
	r[21] = a[21] ^ d

	d = c1 ^ (c3<<1 | c3>>(64-1))
	r[2] = a[2] ^ d
	r[7] = a[7] ^ d
	r[12] = a[12] ^ d
	r[17] = a[17] ^ d
	r[22] = a[22] ^ d

	d = c2 ^ (c4<<1 | c4>>(64-1))
	r[3] = a[3] ^ d
	r[8] = a[8] ^ d
	r[13] = a[13] ^ d
	r[18] = a[18] ^ d
	r[23] = a[23] ^ d

	d = c3 ^ (c0<<1 | c0>>(64-1))
	r[4] = a[4] ^ d
	r[9] = a[9] ^ d
	r[14] = a[14] ^ d
	r[19] = a[19] ^ d
	r[24] = a[24] ^ d
	return r
}

func rhopiU64Version(a [25]uint64) [25]uint64 {
	var t uint64
	t = a[1]
	t, a[10] = a[10], t<<1|t>>(64-1)
	t, a[7] = a[7], t<<3|t>>(64-3)
	t, a[11] = a[11], t<<6|t>>(64-6)
	t, a[17] = a[17], t<<10|t>>(64-10)
	t, a[18] = a[18], t<<15|t>>(64-15)
	t, a[3] = a[3], t<<21|t>>(64-21)
	t, a[5] = a[5], t<<28|t>>(64-28)
	t, a[16] = a[16], t<<36|t>>(64-36)
	t, a[8] = a[8], t<<45|t>>(64-45)
	t, a[21] = a[21], t<<55|t>>(64-55)
	t, a[24] = a[24], t<<2|t>>(64-2)
	t, a[4] = a[4], t<<14|t>>(64-14)
	t, a[15] = a[15], t<<27|t>>(64-27)
	t, a[23] = a[23], t<<41|t>>(64-41)
	t, a[19] = a[19], t<<56|t>>(64-56)
	t, a[13] = a[13], t<<8|t>>(64-8)
	t, a[12] = a[12], t<<25|t>>(64-25)
	t, a[2] = a[2], t<<43|t>>(64-43)
	t, a[20] = a[20], t<<62|t>>(64-62)
	t, a[14] = a[14], t<<18|t>>(64-18)
	t, a[22] = a[22], t<<39|t>>(64-39)
	t, a[9] = a[9], t<<61|t>>(64-61)
	t, a[6] = a[6], t<<20|t>>(64-20)
	a[1] = t<<44 | t>>(64-44)
	return a
}

func chiU64Version(a [25]uint64) [25]uint64 {
	var bc0, bc1, bc2, bc3, bc4 uint64
	bc0 = a[0]
	bc1 = a[1]
	bc2 = a[2]
	bc3 = a[3]
	bc4 = a[4]
	a[0] ^= (^bc1) & bc2
	a[1] ^= (^bc2) & bc3
	a[2] ^= (^bc3) & bc4
	a[3] ^= (^bc4) & bc0
	a[4] ^= (^bc0) & bc1
	bc0 = a[5]
	bc1 = a[6]
	bc2 = a[7]
	bc3 = a[8]
	bc4 = a[9]
	a[5] ^= (^bc1) & bc2
	a[6] ^= (^bc2) & bc3
	a[7] ^= (^bc3) & bc4
	a[8] ^= (^bc4) & bc0
	a[9] ^= (^bc0) & bc1
	bc0 = a[10]
	bc1 = a[11]
	bc2 = a[12]
	bc3 = a[13]
	bc4 = a[14]
	a[10] ^= (^bc1) & bc2
	a[11] ^= (^bc2) & bc3
	a[12] ^= (^bc3) & bc4
	a[13] ^= (^bc4) & bc0
	a[14] ^= (^bc0) & bc1
	bc0 = a[15]
	bc1 = a[16]
	bc2 = a[17]
	bc3 = a[18]
	bc4 = a[19]
	a[15] ^= (^bc1) & bc2
	a[16] ^= (^bc2) & bc3
	a[17] ^= (^bc3) & bc4
	a[18] ^= (^bc4) & bc0
	a[19] ^= (^bc0) & bc1
	bc0 = a[20]
	bc1 = a[21]
	bc2 = a[22]
	bc3 = a[23]
	bc4 = a[24]
	a[20] ^= (^bc1) & bc2
	a[21] ^= (^bc2) & bc3
	a[22] ^= (^bc3) & bc4
	a[23] ^= (^bc4) & bc0
	a[24] ^= (^bc0) & bc1
	return a
}

func iotU64Version(a [25]uint64, r int) [25]uint64 {
	// iota
	a[0] ^= roundConstantsU64[r]
	return a
}