Dart Requires Chilkat v11.0.0+

Verify a CAdES-BES Signature and Examine Signature Contents

See more Digital Signatures Examples

Demonstrates how to validate a .p7m (.p7s) signature and examine the contents of the signature. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final crypt = CkCrypt2();

  final outputFile = 'qa_output/original.xml';
  final inFile = 'qa_data/p7m/fattura_signature.xml.p7m';

  // Verify the signature and extract the contained file, which in this case is XML.
  try {
    crypt.verifyP7M(inFile, outputFile);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Signature validated.');

  // Now let's examine the information about the signature.
  final json = CkJsonObject();
  crypt.getLastJsonData(json);

  json.emitCompact = false;
  print(json.emit());

  // Here's an example of the information about the signature:
  // {
  //   "pkcs7": {
  //     "verify": {
  //       "certs": [
  //         {
  //           "issuerCN": "Xyz EU Qualified Certificates CA G1",
  //           "serial": "99A28A51AC389999"
  //         }
  //       ],
  //       "useConstructedOctets": true,
  //       "digestAlgorithms": [
  //         "sha256"
  //       ],
  //       "signerInfo": [
  //         {
  //           "cert": {
  //             "subjectKeyIdentifier": "5VM4x8AWnXf07yzbXuLtbb0U3yY=",
  //             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
  //             "digestAlgName": "SHA256"
  //           },
  //           "signingAlgOid": "1.2.840.113549.1.1.11",
  //           "signingAlgName": "RSA-SHA256-PKCSV-1_5",
  //           "authAttr": {
  //             "1.2.840.113549.1.9.3": {
  //               "name": "contentType",
  //               "oid": "1.2.840.113549.1.7.1"
  //             },
  //             "1.2.840.113549.1.9.5": {
  //               "name": "signingTime",
  //               "utctime": "190901152340Z"
  //             },
  //             "1.2.840.113549.1.9.4": {
  //               "name": "messageDigest",
  //               "digest": "y+gd/zAQK33A//HInhaZba7w1fUJleV9AHbP1Ntx6U0="
  //             },
  //             "1.2.840.113549.1.9.16.2.47": {
  //               "name": "signingCertificateV2",
  //               "der": "MIH4MI..w4vv0="
  //             }
  //           }
  //         }
  //       ]
  //     }
  //   }
  // }

  // Use this online tool to generate parsing code from sample JSON: 
  // Generate Parsing Code from JSON

  final authAttrSigningTimeUtctime = CkDtObj();
  var issuerCN = '';
  var serial = '';
  var strVal = '';
  var certSubjectKeyIdentifier = '';
  var certDigestAlgOid = '';
  var certDigestAlgName = '';
  var signingAlgOid = '';
  var signingAlgName = '';
  var authAttrContentTypeName = '';
  var authAttrContentTypeOid = '';
  var authAttrSigningTimeName = '';
  var authAttrMessageDigestName = '';
  var authAttrMessageDigestDigest = '';
  var authAttrSigningCertificateV2Name = '';
  var authAttrSigningCertificateV2Der = '';

  var i = 0;
  var countI = json.sizeOfArray('pkcs7.verify.certs');
  while (i < countI) {
    json.i = i;
    issuerCN = json.stringOf('pkcs7.verify.certs[i].issuerCN');
    serial = json.stringOf('pkcs7.verify.certs[i].serial');
    i++;
  }

  i = 0;
  countI = json.sizeOfArray('pkcs7.verify.digestAlgorithms');
  while (i < countI) {
    json.i = i;
    strVal = json.stringOf('pkcs7.verify.digestAlgorithms[i]');
    i++;
  }

  i = 0;
  countI = json.sizeOfArray('pkcs7.verify.signerInfo');
  while (i < countI) {
    json.i = i;
    certSubjectKeyIdentifier = json.stringOf('pkcs7.verify.signerInfo[i].cert.subjectKeyIdentifier');
    certDigestAlgOid = json.stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgOid');
    certDigestAlgName = json.stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgName');
    signingAlgOid = json.stringOf('pkcs7.verify.signerInfo[i].signingAlgOid');
    signingAlgName = json.stringOf('pkcs7.verify.signerInfo[i].signingAlgName');
    authAttrContentTypeName = json.stringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.3".name');
    authAttrContentTypeOid = json.stringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.3".oid');
    authAttrSigningTimeName = json.stringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.5".name');
    json.dtOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.5".utctime', false, authAttrSigningTimeUtctime);
    authAttrMessageDigestName = json.stringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.4".name');
    authAttrMessageDigestDigest = json.stringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.4".digest');
    authAttrSigningCertificateV2Name = json.stringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.16.2.47".name');
    authAttrSigningCertificateV2Der = json.stringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.16.2.47".der');
    i++;
  }
}