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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package stateproof
import (
"fmt"
"math"
"testing"
"github.com/algorand/go-algorand/config"
"github.com/algorand/go-algorand/crypto/merklearray"
"github.com/algorand/go-algorand/test/partitiontest"
"github.com/stretchr/testify/require"
)
func TestMaxNumberOfRevealsInVerify(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
signedWeight := uint64(10)
provenWeight := uint64(10)
lnProvenWt, err := LnIntApproximation(provenWeight)
a.NoError(err)
err = verifyWeights(signedWeight, lnProvenWt, MaxReveals+1, stateProofStrengthTargetForTests)
a.ErrorIs(err, ErrTooManyReveals)
}
func TestMaxNumberOfReveals(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
signedWeight := uint64(1<<10 + 1)
provenWeight := uint64(1 << 10)
lnProvenWt, err := LnIntApproximation(provenWeight)
a.NoError(err)
_, err = numReveals(signedWeight, lnProvenWt, stateProofStrengthTargetForTests)
a.ErrorIs(err, ErrTooManyReveals)
}
func TestVerifyProvenWeight(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
signedWeight := uint64(1 << 11)
provenWeight := uint64(1 << 10)
lnProvenWt, err := LnIntApproximation(provenWeight)
a.NoError(err)
numOfReveals, err := numReveals(signedWeight, lnProvenWt, stateProofStrengthTargetForTests)
a.NoError(err)
err = verifyWeights(signedWeight, lnProvenWt, numOfReveals, stateProofStrengthTargetForTests)
a.NoError(err)
err = verifyWeights(signedWeight, lnProvenWt, numOfReveals-1, stateProofStrengthTargetForTests)
a.ErrorIs(err, ErrInsufficientSignedWeight)
}
func TestVerifyZeroNumberOfRevealsEquation(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
signedWeight := uint64(1<<15 + 1)
provenWeight := uint64(1 << 15)
lnProvenWt, err := LnIntApproximation(provenWeight)
a.NoError(err)
_, err = numReveals(signedWeight, lnProvenWt, stateProofStrengthTargetForTests)
a.ErrorIs(err, ErrNegativeNumOfRevealsEquation)
}
func TestLnWithPrecision(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
val, err := LnIntApproximation(2)
a.NoError(err)
// check that precisionBits will not overflow
exp := 1 << precisionBits
a.Less(precisionBits, uint8(64))
a.GreaterOrEqual(float64(val)/float64(exp), math.Log(2))
a.Greater(math.Log(2), float64(val-1)/float64(exp))
ln2, err := LnIntApproximation(2)
a.NoError(err)
a.Equal(ln2IntApproximation, ln2)
}
func TestVerifyLimits(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
signedWeight := uint64(0)
provenWeight := uint64(1<<10 - 1)
lnProvenWt, err := LnIntApproximation(provenWeight)
a.NoError(err)
err = verifyWeights(signedWeight, lnProvenWt, MaxReveals-1, stateProofStrengthTargetForTests)
a.ErrorIs(err, ErrZeroSignedWeight)
}
func TestNumRevealsApproxBound(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
// In order to create a valid state proof we need to be bound to a MaxNumberOfReveals.
// according to SNARK-friendly weight-verification formula there would be a ratio signedWt/provenWt > 1
// that we would not be able to generate proof since the MaxReveals would be too high.
// This test points out on the minimal ratio signedWt/provenWt we would ever prdouce.
for j := 0; j < 10; j++ {
sigWt := uint64(1<<(40-j) - 1)
// we check the ratios = signedWt/provenWt {3, 2.99, 2.98...1}
// ratio = 1.33 (i==167) would give 625 would be the lower bound we can expect
for i := 0; i < 168; i++ {
a.NoError(checkRatio(i, sigWt, stateProofStrengthTargetForTests))
}
a.ErrorIs(checkRatio(168, sigWt, stateProofStrengthTargetForTests), ErrTooManyReveals)
}
}
func checkRatio(i int, sigWt uint64, secParam uint64) error {
provenWtRatio := 3 - (float64(i) / 100)
provenWt := uint64(float64(sigWt) / (provenWtRatio))
lnProvenWt, err := LnIntApproximation(provenWt)
if err != nil {
return err
}
numOfReveals, err := numReveals(sigWt, lnProvenWt, secParam)
if err != nil {
return fmt.Errorf("failed on sigWt %v provenWt %d ratio is %v i %v err: %w", sigWt, provenWt, provenWtRatio, i, err)
}
log2Sig := math.Log(float64(sigWt)) / math.Log(2)
log2Prov := math.Log(float64(provenWt)) / math.Log(2)
nr := float64(secParam) / (log2Sig - log2Prov)
if 1.01 < float64(numOfReveals)/nr {
return fmt.Errorf("approximated number of reveals exceeds limit "+
"limit %v, signedWeight: %v provenWeight %v, "+
"appox numberOfReveals: %v, real numberOfReveals %v ratio is %v", 1.01, sigWt, provenWt, numOfReveals, nr, provenWtRatio)
}
return nil
}
func TestNumReveals(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
billion := uint64(1000 * 1000 * 1000)
microalgo := uint64(1000 * 1000)
provenWeight := 2 * billion * microalgo
strengthTarget := uint64(stateProofStrengthTargetForTests)
lnProvenWt, err := LnIntApproximation(provenWeight)
a.NoError(err)
for i := uint64(3); i < 10; i++ {
signedWeight := i * billion * microalgo
n, err := numReveals(signedWeight, lnProvenWt, strengthTarget)
a.NoError(err)
if n < 50 || n > 500 {
t.Errorf("numReveals(%d, %d, %d) = %d looks suspect",
signedWeight, provenWeight, strengthTarget, n)
}
err = verifyWeights(signedWeight, lnProvenWt, n, stateProofStrengthTargetForTests)
a.NoError(err)
}
}
func TestSigPartProofMaxSize(t *testing.T) {
partitiontest.PartitionTest(t)
t.Parallel()
// Ensures that the SigPartProofMaxSize constant used for maxtotalbytes for StateProof.(Sig|Part)Proof(s) is
// correct. It should be logically bound by the maximum number of StateProofTopVoters. It is scaled by 1/2
// see merkelarray.Proof comment for explanation of the size calculation.
require.Equal(t, SigPartProofMaxSize, merklearray.ProofMaxSizeByElements(config.StateProofTopVoters/2))
}
func BenchmarkVerifyWeights(b *testing.B) {
billion := uint64(1000 * 1000 * 1000)
microalgo := uint64(1000 * 1000)
provenWeight := 100 * billion * microalgo
signedWeight := 110 * billion * microalgo
strengthTarget := uint64(stateProofStrengthTargetForTests)
lnProvenWt, err := LnIntApproximation(provenWeight)
require.NoError(b, err)
nr, err := numReveals(signedWeight, lnProvenWt, strengthTarget)
if nr < 900 {
b.Errorf("numReveals(%d, %d, %d) = %d < 900", signedWeight, provenWeight, strengthTarget, nr)
}
require.NoError(b, err)
for i := 0; i < b.N; i++ {
verifyWeights(signedWeight, lnProvenWt, nr, strengthTarget)
}
}
func BenchmarkNumReveals(b *testing.B) {
billion := uint64(1000 * 1000 * 1000)
microalgo := uint64(1000 * 1000)
provenWeight := 100 * billion * microalgo
signedWeight := 110 * billion * microalgo
strengthTarget := uint64(stateProofStrengthTargetForTests)
lnProvenWt, err := LnIntApproximation(provenWeight)
require.NoError(b, err)
nr, err := numReveals(signedWeight, lnProvenWt, strengthTarget)
if nr < 900 {
b.Errorf("numReveals(%d, %d, %d) = %d < 900", signedWeight, provenWeight, strengthTarget, nr)
}
require.NoError(b, err)
for i := 0; i < b.N; i++ {
numReveals(signedWeight, lnProvenWt, strengthTarget)
}
}
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