125 lines
2.3 KiB
Go
125 lines
2.3 KiB
Go
// +build ignore
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package main
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import (
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"fmt"
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"os"
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"text/template"
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)
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var roundc [24]uint64
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var rotc [5][5]int
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func main() {
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// Round constants
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rc := uint8(1)
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for i := 0; i < 24; i++ {
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for j := 0; j <= 6; j++ {
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roundc[i] |= uint64(rc&1) << (1<<uint(j) - 1)
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rc = rc<<1 ^ 0x71&uint8(int8(rc)>>7)
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}
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}
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// Rotation constants
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x, y := 1, 0
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for i := 1; i < 25; i++ {
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rotc[x][y] = (i * (i + 1) / 2) % 64
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x, y = y, (2*x+3*y)%5
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}
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var ctx = struct {
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Rotc [5][5]int
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}{
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rotc,
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}
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err := tmpl.Execute(os.Stdout, &ctx)
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if err != nil {
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fmt.Println(err)
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}
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}
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func count(n int) []int {
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var out = make([]int, n)
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for i := 0; i < n; i++ {
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out[i] = i
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}
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return out
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}
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func add(a, b, m int) int {
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return (a + b) % m
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}
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func sub(a, b int) int {
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return a - b
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}
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func mul(a, b int) int {
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return a * b
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}
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var funcs = template.FuncMap{
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"count": count,
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"add": add,
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"sub": sub,
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"mul": mul,
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}
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var tmpl = template.Must(template.New("keccak").Funcs(funcs).Parse(`
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// Generated from go run gen.go
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// DO NOT EDIT
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package keccak
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// round implements one round of the keccak-f[1600] permutation.
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func roundGo(a *[5][5]uint64) {
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{{ range $x := count 5 }}
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var a{{$x}}0, a{{$x}}1, a{{$x}}2, a{{$x}}3, a{{$x}}4 uint64
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{{ end }}
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// Theta
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var c0, c1, c2, c3, c4 uint64
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{{ range $y := count 5 }}
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{{ range $x := count 5 }}
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{{ if eq $y 0 }}
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c{{$x}} = a[{{$y}}][{{$x}}]
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{{ else }}
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c{{$x}} ^= a[{{$y}}][{{$x}}]
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{{ end }}
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{{ end }}
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{{ end }}
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var d uint64
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{{ range $x := count 5 }}
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{{ $x0 := add $x 4 5 }}
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{{ $x1 := add $x 1 5 }}
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d = c{{$x0}} ^ (c{{$x1}}<<1 | c{{$x1}}>>63)
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{{ range $y := count 5 }}
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a{{$x}}{{$y}} = a[{{$y}}][{{$x}}] ^ d
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{{ end }}
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{{ end }}
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// Rho
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{{ range $y := count 5 }}
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{{ range $x := count 5 }}
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{{ $a := printf "a%d%d" $x $y }}
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{{ $r := index $.Rotc $x $y }}
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{{$a}} = {{$a}}<<{{$r}} | {{$a}}>>{{sub 64 $r}}
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{{ end }}
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{{ end }}
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// Pi / Chi / output
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{{ range $y := count 5 }}
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{{ range $x := count 5 }}
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{{ $x0 := add $x (mul $y 3) 5 }}
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{{ $y0 := $x }}
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{{ $x1 := add (add $x 1 5) (mul $y 3) 5 }}
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{{ $y1 := add $x 1 5 }}
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{{ $x2 := add (add $x 2 5) (mul $y 3) 5 }}
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{{ $y2 := add $x 2 5 }}
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a[{{$y}}][{{$x}}] = a{{$x0}}{{$y0}} ^ (a{{$x2}}{{$y2}} &^ a{{$x1}}{{$y1}})
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{{ end }}
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{{ end }}
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}
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`))
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