Fix some issues with rebase

Author: dmanc

encoding/kzg/prover/commitments.go

@@ -1,6 +1,8 @@
 package prover
 
 import (
+	"fmt"
+
 	"github.com/Layr-Labs/eigenda/encoding/kzg"
 	"github.com/consensys/gnark-crypto/ecc"
 	"github.com/consensys/gnark-crypto/ecc/bn254"
@@ -15,14 +17,25 @@ type KzgCommitmentsGnarkBackend struct {
 
 func (p *KzgCommitmentsGnarkBackend) ComputeLengthProof(coeffs []fr.Element) (*bn254.G2Affine, error) {
 	inputLength := uint64(len(coeffs))
-	shiftedSecret := p.G2Trailing[p.KzgConfig.SRSNumberToLoad-inputLength:]
+	return p.ComputeLengthProofForLength(coeffs, inputLength)
+}
+
+func (p *KzgCommitmentsGnarkBackend) ComputeLengthProofForLength(coeffs []fr.Element, length uint64) (*bn254.G2Affine, error) {
+	if length < uint64(len(coeffs)) {
+		return nil, fmt.Errorf("length is less than the number of coefficients")
+	}
+
+	start := p.KzgConfig.SRSNumberToLoad - length
+	shiftedSecret := p.G2Trailing[start : start+uint64(len(coeffs))]
 	config := ecc.MultiExpConfig{}
+
 	//The proof of low degree is commitment of the polynomial shifted to the largest srs degree
 	var lengthProof bn254.G2Affine
 	_, err := lengthProof.MultiExp(shiftedSecret, coeffs, config)
 	if err != nil {
 		return nil, err
 	}
+
 	return &lengthProof, nil
 }
 

encoding/kzg/prover/parametrized_prover_test.go

@@ -24,10 +24,7 @@ func TestProveAllCosetThreads(t *testing.T) {
 	inputFr, err := rs.ToFrArray(gettysburgAddressBytes)
 	assert.Nil(t, err)
 
-	frames, fIndices, err := enc.GetFrames(inputFr)
-	require.Nil(t, err)
-
-	commit, _, _, err := enc.GetCommitments(inputFr)
+	commit, _, _, frames, fIndices, err := enc.Encode(inputFr)
 	require.Nil(t, err)
 
 	for i := 0; i < len(frames); i++ {

encoding/kzg/prover/prover.go

@@ -403,7 +403,7 @@ func (p *Prover) createGnarkBackendProver(params encoding.EncodingParams, fs *ff
 	}
 
 	// Set KZG Commitments default backend
-	commitmentsBckend := &KzgCommitmentsGnarkBackend{
+	commitmentsBackend := &KzgCommitmentsGnarkBackend{
 		Srs:        p.Srs,
 		G2Trailing: p.G2Trailing,
 		KzgConfig:  p.KzgConfig,
@@ -415,7 +415,7 @@ func (p *Prover) createGnarkBackendProver(params encoding.EncodingParams, fs *ff
 		KzgConfig:             p.KzgConfig,
 		Ks:                    ks,
 		KzgMultiProofBackend:  multiproofBackend,
-		KzgCommitmentsBackend: commitmentsBckend,
+		KzgCommitmentsBackend: commitmentsBackend,
 	}, nil
 }