Dart
Dart
Verify and Unwrap S/MIME, and get Information about CMS Signature
See more MIME Examples
Demonstrates calling the Verify method to verify and unwrap S/MIME. The MIME is restored to the original structure that it would have originally had prior to signing. The Verify method works with both detached signatures, as well as opaque/attached signatures.Calls LastJsonData to get information about the signature(s) that were verified.
Chilkat Dart Downloads
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 mime = CkMime();
// Load the signed MIME from a file...
try {
mime.loadMimeFile('qa_data/mime/detached_sig.eml');
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// Verify the S/MIME and restore the MIME
// to the structure/content it had prior to signing.
try {
mime.verify();
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// Examine the details of what was verified.
final json = CkJsonObject();
mime.getLastJsonData(json);
json.emitCompact = false;
print(json.emit());
// The code to parse the following JSON (i.e. extract desired information) is shown below..
// {
// "pkcs7": {
// "verify": {
// "certs": [
// {
// "issuerCN": "VeriSign Class 1 Public Primary Certification Authority - G3",
// "serial": "0702A21A85B84B659E180A6EE6F5A365"
// },
// {
// "issuerCN": "VeriSign Class 1 Public Primary Certification Authority - G3",
// "serial": "008B5B75568454850B00CFAF3848CEB1A4"
// },
// {
// "issuerCN": "Symantec Class 1 Individual Subscriber CA - G5",
// "serial": "619C55C32FF6BD1A7B7E0330D21C8F3C"
// }
// ],
// "digestAlgorithms": [
// "sha1"
// ],
// "signerInfo": [
// {
// "cert": {
// "serialNumber": "619C55C32FF6BD1A7B7E0330D21C8F3C",
// "issuerCN": "Symantec Class 1 Individual Subscriber CA - G5",
// "digestAlgOid": "1.3.14.3.2.26",
// "digestAlgName": "SHA1"
// },
// "contentType": "1.2.840.113549.1.7.1",
// "signingTime": "160428055000Z",
// "messageDigest": "2hJJVmO/jtaJV5uCKMFzIkRRvtY=",
// "signingAlgOid": "1.2.840.113549.1.1.1",
// "signingAlgName": "RSA-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": "160428055000Z"
// },
// "1.2.840.113549.1.9.4": {
// "name": "messageDigest",
// "digest": "2hJJVmO/jtaJV5uCKMFzIkRRvtY="
// },
// "1.2.840.113549.1.9.15": {
// "der": "MFAwCwYJYIZIAWUDBAECMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDANBggqhkiG9w0DAgIBQDAHBgUrDgMCBzANBggqhkiG9w0DAgIBKA=="
// },
// "1.3.6.1.4.1.311.16.4": {
// "der": "MIG7MIG...7fgMw0hyPPA=="
// }
// }
// }
// ]
// }
// }
// }
// Use this online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON
final signingTime = CkDtObj();
final authAttrSigningTimeUtctime = CkDtObj();
var issuerCN = '';
var serial = '';
var strVal = '';
var certSerialNumber = '';
var certIssuerCN = '';
var certDigestAlgOid = '';
var certDigestAlgName = '';
var contentType = '';
var messageDigest = '';
var signingAlgOid = '';
var signingAlgName = '';
var authAttrContentTypeName = '';
var authAttrContentTypeOid = '';
var authAttrSigningTimeName = '';
var authAttrMessageDigestName = '';
var authAttrMessageDigestDigest = '';
var authAttr1_2_840_113549_1_9_15Der = '';
var authAttr1_3_6_1_4_1_311_16_4Der = '';
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;
certSerialNumber = json.stringOf('pkcs7.verify.signerInfo[i].cert.serialNumber');
certIssuerCN = json.stringOf('pkcs7.verify.signerInfo[i].cert.issuerCN');
certDigestAlgOid = json.stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgOid');
certDigestAlgName = json.stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgName');
contentType = json.stringOf('pkcs7.verify.signerInfo[i].contentType');
json.dtOf('pkcs7.verify.signerInfo[i].signingTime', false, signingTime);
messageDigest = json.stringOf('pkcs7.verify.signerInfo[i].messageDigest');
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');
authAttr1_2_840_113549_1_9_15Der = json.stringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.15".der');
authAttr1_3_6_1_4_1_311_16_4Der = json.stringOf('pkcs7.verify.signerInfo[i].authAttr."1.3.6.1.4.1.311.16.4".der');
i++;
}
}