mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-12-30 18:35:18 +00:00
137 lines
2.9 KiB
Go
137 lines
2.9 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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"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves/native/pasta/fq"
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)
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// Handles the packing of bits and fields according to Mina spec
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type roinput struct {
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fields []*fp.Fp
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bits *BitVector
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}
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var conv = map[bool]int{
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true: 1,
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false: 0,
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}
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func (r *roinput) Init(fields int, bytes int) *roinput {
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r.fields = make([]*fp.Fp, 0, fields)
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r.bits = NewBitVector(make([]byte, bytes), 0)
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return r
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}
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func (r *roinput) Clone() *roinput {
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t := new(roinput)
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t.fields = make([]*fp.Fp, len(r.fields))
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for i, f := range r.fields {
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t.fields[i] = new(fp.Fp).Set(f)
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}
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buffer := r.bits.Bytes()
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data := make([]byte, len(buffer))
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copy(data, buffer)
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t.bits = NewBitVector(data, r.bits.Length())
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return t
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}
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func (r *roinput) AddFp(fp *fp.Fp) {
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r.fields = append(r.fields, fp)
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}
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func (r *roinput) AddFq(fq *fq.Fq) {
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scalar := fq.ToRaw()
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// Mina handles fields as 255 bit numbers
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// with each field we lose a bit
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for i := 0; i < 255; i++ {
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limb := i / 64
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idx := i % 64
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b := (scalar[limb] >> idx) & 1
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r.bits.Append(byte(b))
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}
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}
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func (r *roinput) AddBit(b bool) {
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r.bits.Append(byte(conv[b]))
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}
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func (r *roinput) AddBytes(input []byte) {
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for _, b := range input {
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for i := 0; i < 8; i++ {
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r.bits.Append(byte((b >> i) & 1))
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}
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}
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}
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func (r *roinput) AddUint32(x uint32) {
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for i := 0; i < 32; i++ {
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r.bits.Append(byte((x >> i) & 1))
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}
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}
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func (r *roinput) AddUint64(x uint64) {
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for i := 0; i < 64; i++ {
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r.bits.Append(byte((x >> i) & 1))
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}
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}
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func (r roinput) Bytes() []byte {
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out := make([]byte, (r.bits.Length()+7)/8+32*len(r.fields))
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res := NewBitVector(out, 0)
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// Mina handles fields as 255 bit numbers
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// with each field we lose a bit
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for _, f := range r.fields {
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buf := f.ToRaw()
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for i := 0; i < 255; i++ {
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limb := i / 64
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idx := i % 64
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b := (buf[limb] >> idx) & 1
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res.Append(byte(b))
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}
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}
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for i := 0; i < r.bits.Length(); i++ {
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res.Append(r.bits.Element(i))
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}
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return out
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}
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func (r roinput) Fields() []*fp.Fp {
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fields := make([]*fp.Fp, 0, len(r.fields)+r.bits.Length()/256)
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for _, f := range r.fields {
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fields = append(fields, new(fp.Fp).Set(f))
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}
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const maxChunkSize = 254
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bitsConsumed := 0
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bitIdx := 0
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for bitsConsumed < r.bits.Length() {
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var chunk [4]uint64
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remaining := r.bits.Length() - bitsConsumed
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var chunkSizeInBits int
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if remaining > maxChunkSize {
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chunkSizeInBits = maxChunkSize
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} else {
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chunkSizeInBits = remaining
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}
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for i := 0; i < chunkSizeInBits; i++ {
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limb := i >> 6
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idx := i & 0x3F
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b := r.bits.Element(bitIdx)
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chunk[limb] |= uint64(b) << idx
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bitIdx++
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}
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fields = append(fields, new(fp.Fp).SetRaw(&chunk))
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bitsConsumed += chunkSizeInBits
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}
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return fields
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}
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