feat: update Data Integirty error handling (#3628)

Signed-off-by: Mykhailo Sizov <mykhailo.sizov@securekey.com>

component/models/dataintegrity/signer.go

@@ -82,7 +82,8 @@ func (s *Signer) AddProof(doc []byte, opts *models.ProofOptions) ([]byte, error)
 
 	proof, err := signerSuite.CreateProof(doc, opts)
 	if err != nil {
-		return nil, ErrProofGeneration
+		// TODO update linter to use go 1.20: https://github.com/hyperledger/aries-framework-go/issues/3613
+		return nil, errors.Join(ErrProofGeneration, err) // nolint:typecheck
 	}
 
 	if proof.Type == "" || proof.ProofPurpose == "" || proof.VerificationMethod == "" {
@@ -108,7 +109,8 @@ func (s *Signer) AddProof(doc []byte, opts *models.ProofOptions) ([]byte, error)
 
 	out, err := sjson.SetRawBytes(doc, proofPath, proofRaw)
 	if err != nil {
-		return nil, ErrProofGeneration
+		// TODO update linter to use go 1.20: https://github.com/hyperledger/aries-framework-go/issues/3613
+		return nil, errors.Join(ErrProofGeneration, err) // nolint:typecheck
 	}
 
 	return out, nil

component/models/dataintegrity/suite/ecdsa2019/ecdsa2019.go

@@ -323,7 +323,8 @@ func hashData(transformedDoc, confData []byte, h hash.Hash) []byte {
 
 func proofConfig(docCtx interface{}, opts *models.ProofOptions) (map[string]interface{}, error) {
 	if opts.Purpose != opts.VerificationRelationship {
-		return nil, errors.New("verification method is not suitable for purpose")
+		return nil, fmt.Errorf(
+			"verification method %s is not suitable for purpose %s", opts.VerificationRelationship, opts.Purpose)
 	}
 
 	timeStr := opts.Created.Format(models.DateTimeFormat)

component/models/dataintegrity/suite/ecdsa2019/ecdsa2019_test.go

@@ -338,7 +338,7 @@ func TestSharedFailures(t *testing.T) {
 		tc := successCase(t)
 
 		tc.proofOpts.Purpose = fooBar
-		tc.errStr = "verification method is not suitable for purpose"
+		tc.errStr = "verification method assertionMethod is not suitable for purpose foo bar"
 
 		testSign(t, tc)
 	})