mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
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113 lines
2.0 KiB
Go
113 lines
2.0 KiB
Go
//
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// Copyright Coinbase, Inc. All Rights Reserved.
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package mina
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import (
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"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves/native/pasta/fp"
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)
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// SBox is the type of exponentiation to perform
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type SBox int
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const (
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Cube = iota // x^3
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Quint // x^5
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Sept // x^7
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Inverse // x^-1
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)
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// Exp mutates f by computing x^3, x^5, x^7 or x^-1 as described in
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// https://eprint.iacr.org/2019/458.pdf page 8
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func (sbox SBox) Exp(f *fp.Fp) {
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switch sbox {
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case Cube:
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t := new(fp.Fp).Square(f)
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f.Mul(t, f)
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case Quint:
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t := new(fp.Fp).Square(f)
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t.Square(t)
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f.Mul(t, f)
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case Sept:
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f2 := new(fp.Fp).Square(f)
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f4 := new(fp.Fp).Square(f2)
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t := new(fp.Fp).Mul(f2, f4)
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f.Mul(t, f)
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case Inverse:
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f.Invert(f)
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default:
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}
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}
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// Permutation is the permute function to use
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type Permutation int
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const (
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ThreeW = iota
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FiveW
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Three
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)
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// Permute executes the poseidon hash function
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func (p Permutation) Permute(ctx *Context) {
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switch p {
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case ThreeW:
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for r := 0; r < ctx.fullRounds; r++ {
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ark(ctx, r)
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sbox(ctx)
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mds(ctx)
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}
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ark(ctx, ctx.fullRounds)
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case Three:
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fallthrough
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case FiveW:
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// Full rounds only
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for r := 0; r < ctx.fullRounds; r++ {
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sbox(ctx)
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mds(ctx)
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ark(ctx, r)
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}
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default:
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}
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}
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func ark(ctx *Context, round int) {
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for i := 0; i < ctx.spongeWidth; i++ {
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ctx.state[i].Add(ctx.state[i], ctx.roundKeys[round][i])
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}
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}
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func sbox(ctx *Context) {
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for i := 0; i < ctx.spongeWidth; i++ {
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ctx.sBox.Exp(ctx.state[i])
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}
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}
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func mds(ctx *Context) {
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state2 := make([]*fp.Fp, len(ctx.state))
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for i := range ctx.state {
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state2[i] = new(fp.Fp).SetZero()
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}
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for row := 0; row < ctx.spongeWidth; row++ {
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for col := 0; col < ctx.spongeWidth; col++ {
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t := new(fp.Fp).Mul(ctx.state[col], ctx.mdsMatrix[row][col])
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state2[row].Add(state2[row], t)
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}
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}
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for i, f := range state2 {
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ctx.state[i].Set(f)
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}
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}
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// NetworkType is which Mina network id to use
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type NetworkType int
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const (
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TestNet = iota
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MainNet
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NullNet
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)
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