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examples: improve ZKP production example

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Add more detailed errors and comments.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
This commit is contained in:
Anna Shaleva 2023-11-28 10:34:52 +03:00
parent 29f344fd9b
commit d7b84c0b47
1 changed files with 20 additions and 7 deletions
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27
examples/zkp/cubic_circuit/main_test.go
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@ -1,6 +1,7 @@
package cubic
import (
"fmt"
"math"
"os"
"path/filepath"
@ -156,6 +157,12 @@ func TestCubicCircuit_EndToEnd(t *testing.T) {
// result for proving/verifying keys generation and demonstrates how to contribute
// some randomness into it.
func TestCubicCircuit_EndToEnd_Prod(t *testing.T) {
const (
// Response file generated locally for 2^8 powers.
pathToResponseFile = "./response8"
// The order of Powers of Tau ceremony, it depends on the response file.
orderOfResponseFile = 8
)
var (
circuit CubicCircuit
assignment = CubicCircuit{X: 3, Y: 35}
@ -166,8 +173,10 @@ func TestCubicCircuit_EndToEnd_Prod(t *testing.T) {
require.NoError(t, err)
// Setup (groth16 zkSNARK), use MPC-based solution for proving and verifying
// keys generation.
pk, vk := setup(t, ccs, "./response8", 8) // the order of Powers of Tau ceremony, depends on the response file.
// keys generation. Please, be careful while adopting this code for your circuit.
// Ensure that response file that you've provided contains enough powers computed
// so that the number of constraints in your circuit can be handled.
pk, vk := setup(t, ccs, pathToResponseFile, orderOfResponseFile)
// Intermediate step: witness definition.
witness, err := frontend.NewWitness(&assignment, ecc.BLS12_381.ScalarField())
@ -262,20 +271,21 @@ func setup(t *testing.T, ccs constraint.ConstraintSystem, phase1ResponsePath str
beta_coef_g1 := make([]curve.G1Affine, inN)
// Accumulator serialization: https://github.com/filecoin-project/powersoftau/blob/ab8f85c28f04af5a99cfcc93a3b1f74c06f94105/src/accumulator.rs#L111
errMessage := fmt.Sprintf("ensure your response file contains exactly 2^%d powers of tau for BLS12-381 curve", inPow)
for i := range coef_g1 {
require.NoError(t, dec.Decode(&coef_g1[i]))
require.NoError(t, dec.Decode(&coef_g1[i]), errMessage)
}
for i := range coef_g2 {
require.NoError(t, dec.Decode(&coef_g2[i]))
require.NoError(t, dec.Decode(&coef_g2[i]), errMessage)
}
for i := range alpha_coef_g1 {
require.NoError(t, dec.Decode(&alpha_coef_g1[i]))
require.NoError(t, dec.Decode(&alpha_coef_g1[i]), errMessage)
}
for i := range beta_coef_g1 {
require.NoError(t, dec.Decode(&beta_coef_g1[i]))
require.NoError(t, dec.Decode(&beta_coef_g1[i]), errMessage)
}
beta_g2 := &curve.G2Affine{}
require.NoError(t, dec.Decode(beta_g2))
require.NoError(t, dec.Decode(beta_g2), errMessage)
// Transform (take exactly those number of powers that needed for the given number of constraints).
var (
@ -286,6 +296,9 @@ func setup(t *testing.T, ccs constraint.ConstraintSystem, phase1ResponsePath str
}
outN := int64(math.Pow(2, float64(outPow)))
if len(coef_g1) < int(2*outN-1) {
t.Fatalf("number of circuit constraints is too large for the provided response file: nbConstraints is %d, required at least %d powers to be computed", numConstraints, outN)
}
srs1 := mpcsetup.Phase1{}
srs1.Parameters.G1.Tau = coef_g1[:2*outN-1] // outN + (outN-1)
srs1.Parameters.G2.Tau = coef_g2[:outN] // outN