feat(签名验签): 继续优化逻辑

ofdgo_sign_verify.go

@@ -52,6 +52,7 @@ type SignatureVerifyReport struct {
 	References         []SignatureReferenceVerify
 	Stamps             []SignatureStamp
 	StampPositions     []SignatureStampPosition
+	StampPositionError string
 	DigestOK           bool
 	DataHashOK         bool
 	SignedValueOK      bool
@@ -235,8 +236,7 @@ func (r *Reader) verifySignature(sigListPath string, sigRef Signature, options *
 	report.Stamps = append(report.Stamps, sigFile.SignedInfo.StampAnnot...)
 	report.StampPositions, err = r.SignatureStampPositions(report.Stamps)
 	if err != nil {
-		report.Error = err.Error()
-		return report
+		report.StampPositionError = err.Error()
 	}
 	report.DigestOK = referencesOK(report.References)
 	signedValuePath := signatureRefPath(sigPath, sigFile.SignedValue)