Dart Requires Chilkat v11.0.0+
Dart
Validate CAdES-T Signature (.p7m)
See more CAdES Examples
Validates a CAdES-T CMS signature and extracts the time-stamp token and gets information about it. Also validates the time-stamp token.Chilkat Dart Downloads
import 'package:chilkat/chilkat.dart';
void main() {
var success = false;
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
final crypt = CkCrypt2();
// Indicate that the CAdES-T timestamp tokens must also pass validation for the signature to be validated.
final cmsOptions = CkJsonObject();
cmsOptions.updateBool('ValidateTimestampTokens', true);
crypt.cmsOptions = cmsOptions.emit();
// Validate the .p7m and extract the original signed data to an output file.
// Note: The timestampToken is an unauthenticated attribute. See the code below that retrieves and parses the last JSON data.
// for details about examining timestampToken.
success = true;
try {
crypt.verifyP7M('qa_data/cades/CAdES-T/Signature-C-T-1.p7m', 'qa_output/out.dat');
} on ChilkatException {
success = false;
}
// Get information about the CMS signature in the last JSON data.
// The detailed results of the signature validation are available in the last JSON data.
// (If the non-success return status was caused by an error such as "file not found", then the
// last JSON data would be empty.)
final json = CkJsonObject();
crypt.getLastJsonData(json);
json.emitCompact = false;
print(json.emit());
// Here is a sample result:
// See the parsing code below..
// Use this online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON
// {
// "pkcs7": {
// "verify": {
// "digestAlgorithms": [
// "sha256"
// ],
// "signerInfo": [
// {
// "cert": {
// "serialNumber": "00DCB814678CDB",
// "issuerCN": "LevelBCAOK",
// "issuerDN": "",
// "digestAlgOid": "2.16.840.1.101.3.4.2.1",
// "digestAlgName": "SHA256"
// },
// "contentType": "1.2.840.113549.1.7.1",
// "signingTime": "131203065741Z",
// "messageDigest": "JJZt41Nt8VsYahP+Xti4rR3vBDkUfRd6gquItl6R5Os=",
// "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": "131203065741Z"
// },
// "1.2.840.113549.1.9.4": {
// "name": "messageDigest",
// "digest": "JJZt41Nt8VsYahP+Xti4rR3vBDkUfRd6gquItl6R5Os="
// },
// "1.2.840.113549.1.9.16.2.47": {
// "name": "signingCertificateV2",
// "der": "MIGIMIGFMIGCBCBJrxOU0w0dWGsVovjLv9QDH3syB5mLVv3grSYA40x9IDBeMFOkUTBPMQswCQYDVQQGEwJGUjENMAsGA1UEChMERVRTSTEcMBoGA1UECwwTUGx1Z3Rlc3RzXzIwMTMtMjAxNDETMBEGA1UEAxMKTGV2ZWxCQ0FPSwIHANy4FGeM2w=="
// }
// },
// "unauthAttr": {
// "1.2.840.113549.1.9.16.2.14": {
// "name": "timestampToken",
// "der": "MIIL+AYJKoZI...u7CfcjURNTY=",
// "verify": {
// "digestAlgorithms": [
// "sha256"
// ],
// "signerInfo": [
// {
// "cert": {
// "serialNumber": "01AA4592D36C61",
// "issuerCN": "RootCAOK",
// "issuerDN": "",
// "digestAlgOid": "2.16.840.1.101.3.4.2.1",
// "digestAlgName": "SHA256"
// },
// "contentType": "1.2.840.113549.1.9.16.1.4",
// "messageDigest": "NSsMUrfoyCQ0OszPE1YLx1j3EyyCiBmnE5Sua6ghu/Q=",
// "signingAlgOid": "1.2.840.113549.1.1.1",
// "signingAlgName": "RSA-PKCSV-1_5",
// "authAttr": {
// "1.2.840.113549.1.9.3": {
// "name": "contentType",
// "oid": "1.2.840.113549.1.9.16.1.4"
// },
// "1.2.840.113549.1.9.4": {
// "name": "messageDigest",
// "digest": "NSsMUrfoyCQ0OszPE1YLx1j3EyyCiBmnE5Sua6ghu/Q="
// },
// "1.2.840.113549.1.9.16.2.47": {
// "name": "signingCertificateV2",
// "der": "MIGGMIGDMIGABCDB/np5UxvhcPnSxD2Kme+C88uXGCMWLAvFPHNvTApTWDBcMFGkTzBNMQswCQYDVQQGEwJGUjENMAsGA1UEChMERVRTSTEcMBoGA1UECwwTUGx1Z3Rlc3RzXzIwMTMtMjAxNDERMA8GA1UEAxMIUm9vdENBT0sCBwGqRZLTbGE="
// }
// }
// }
// ]
// },
// "timestampSignatureVerified": true,
// "tstInfo": {
// "tsaPolicyId": "1.3.6.1.4.1.2706.2.2.5.2.1.1.1",
// "messageImprint": {
// "hashAlg": "sha256",
// "digest": "C8xEe9NA4X1cUyHGX9zG89ipmQ2byFs3aa+Xe4Fz2P0=",
// "digestMatches": true
// },
// "serialNumber": "313E162121D922",
// "genTime": "20131203065742Z"
// }
// }
// }
// }
// ]
// }
// }
// }
//
var i = 0;
var countI = 0;
var strVal = '';
var certSerialNumber = '';
var certIssuerCN = '';
var certIssuerDN = '';
var certDigestAlgOid = '';
var certDigestAlgName = '';
var contentType = '';
final signingTime = CkDtObj();
var messageDigest = '';
var signingAlgOid = '';
var signingAlgName = '';
var authAttrContentTypeName = '';
var authAttrContentTypeOid = '';
var authAttrSigningTimeName = '';
final authAttrSigningTimeUtctime = CkDtObj();
var authAttrMessageDigestName = '';
var authAttrMessageDigestDigest = '';
var authAttrSigningCertificateV2Name = '';
var authAttrSigningCertificateV2Der = '';
var unauthAttrTimestampTokenName = '';
var unauthAttrTimestampTokenDer = '';
var unauthAttrTimestampTokenTstInfoTsaPolicyId = '';
var unauthAttrTimestampTokenTstInfoMessageImprintHashAlg = '';
var unauthAttrTimestampTokenTstInfoMessageImprintDigest = '';
var unauthAttrTimestampTokenTstInfoSerialNumber = '';
final unauthAttrTimestampTokenTstInfoGenTime = CkDtObj();
var j = 0;
var countJ = 0;
// Iterate over the hash algorithms used in the signature.
i = 0;
countI = json.sizeOfArray('pkcs7.verify.digestAlgorithms');
while (i < countI) {
json.i = i;
strVal = json.stringOf('pkcs7.verify.digestAlgorithms[i]');
i++;
}
// For each signer...
i = 0;
countI = json.sizeOfArray('pkcs7.verify.signerInfo');
while (i < countI) {
json.i = i;
// Get information about the certificate used by this signer.
certSerialNumber = json.stringOf('pkcs7.verify.signerInfo[i].cert.serialNumber');
certIssuerCN = json.stringOf('pkcs7.verify.signerInfo[i].cert.issuerCN');
certIssuerDN = json.stringOf('pkcs7.verify.signerInfo[i].cert.issuerDN');
certDigestAlgOid = json.stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgOid');
certDigestAlgName = json.stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgName');
// Get additional information for this signer, such as the signingTime, signature algorithm, etc.
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');
// --------------------------------
// Examine authenticated attributes.
// --------------------------------
// contentType
if (json.hasMember('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.3"')) {
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');
}
// signingTime
if (json.hasMember('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.5"')) {
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);
}
// messageDigest
if (json.hasMember('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.4"')) {
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');
}
// signingCertificateV2
if (json.hasMember('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.16.2.47"')) {
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');
}
// --------------------------------
// Examine unauthenticated attributes.
// --------------------------------
// timestampToken (the timestampToken is what makes this signature a CAdES-T)
if (json.hasMember('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14"')) {
unauthAttrTimestampTokenName = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".name');
unauthAttrTimestampTokenDer = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".der');
// This is where we find out if the timestampToken's signature is valid.
json.boolOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".timestampSignatureVerified');
unauthAttrTimestampTokenTstInfoTsaPolicyId = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.tsaPolicyId');
unauthAttrTimestampTokenTstInfoMessageImprintHashAlg = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.messageImprint.hashAlg');
unauthAttrTimestampTokenTstInfoMessageImprintDigest = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.messageImprint.digest');
// Here is where we check to see if the digest in the timestampToken's messageImprint matches the digest of the signature of this signerInfo
json.boolOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.messageImprint.digestMatches');
unauthAttrTimestampTokenTstInfoSerialNumber = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.serialNumber');
// Here is where we get the date/time of the timestampToken (i.e. when it was timestamped)
json.dtOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.genTime', false, unauthAttrTimestampTokenTstInfoGenTime);
// The following code gets details about the validity of the timestampToken's signature...
j = 0;
countJ = json.sizeOfArray('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.digestAlgorithms');
while (j < countJ) {
json.j = j;
strVal = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.digestAlgorithms[j]');
j++;
}
j = 0;
countJ = json.sizeOfArray('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo');
while (j < countJ) {
json.j = j;
certSerialNumber = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].cert.serialNumber');
certIssuerCN = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].cert.issuerCN');
certIssuerDN = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].cert.issuerDN');
certDigestAlgOid = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].cert.digestAlgOid');
certDigestAlgName = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].cert.digestAlgName');
contentType = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].contentType');
messageDigest = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].messageDigest');
signingAlgOid = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].signingAlgOid');
signingAlgName = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].signingAlgName');
authAttrContentTypeName = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].authAttr."1.2.840.113549.1.9.3".name');
authAttrContentTypeOid = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].authAttr."1.2.840.113549.1.9.3".oid');
authAttrMessageDigestName = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].authAttr."1.2.840.113549.1.9.4".name');
authAttrMessageDigestDigest = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].authAttr."1.2.840.113549.1.9.4".digest');
authAttrSigningCertificateV2Name = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].authAttr."1.2.840.113549.1.9.16.2.47".name');
authAttrSigningCertificateV2Der = json.stringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].authAttr."1.2.840.113549.1.9.16.2.47".der');
j++;
}
}
i++;
}
if (!success) {
print(crypt.lastErrorText);
print('CAdES-T verification failed.');
} else {
print('CAdES-T signature is valid.');
}
}