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VB.NET UWP/WinRT Examples

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(VB.NET UWP/WinRT) Validate CAdES-T Signature (.p7m)

Validates a CAdES-T CMS signature and extracts the time-stamp token and gets information about it. Also validates the time-stamp token.

Note: This example requires Chilkat v9.5.0.78 or greater.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim crypt As New Chilkat.Crypt2
Dim success As Boolean

' Indicate that the CAdES-T timestamp tokens must also pass validation for the signature to be validated.
Dim cmsOptions As New Chilkat.JsonObject
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 parses the LastJsonData
' for details about examining timestampToken.
success = crypt.VerifyP7M("qa_data/cades/CAdES-T/Signature-C-T-1.p7m","qa_output/out.dat")

' Get information about the CMS signature in the LastJsonData.
' The detailed results of the signature validation are available in LastJsonData.
' (If the non-success return status was caused by an error such as "file not found", then the
' LastJsonData would be empty.)
Dim json As Chilkat.JsonObject = crypt.LastJsonData()
json.EmitCompact = False
Debug.WriteLine(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"
'               }
'             }
'           }
'         }
'       ]
'     }
'   }
' }
' 

Dim i As Integer
Dim count_i As Integer
Dim strVal As String
Dim certSerialNumber As String
Dim certIssuerCN As String
Dim certIssuerDN As String
Dim certDigestAlgOid As String
Dim certDigestAlgName As String
Dim contentType As String
Dim signingTime As New Chilkat.DtObj
Dim messageDigest As String
Dim signingAlgOid As String
Dim signingAlgName As String
Dim authAttrContentTypeName As String
Dim authAttrContentTypeOid As String
Dim authAttrSigningTimeName As String
Dim authAttrSigningTimeUtctime As New Chilkat.DtObj
Dim authAttrMessageDigestName As String
Dim authAttrMessageDigestDigest As String
Dim authAttrSigningCertificateV2Name As String
Dim authAttrSigningCertificateV2Der As String
Dim unauthAttrTimestampTokenName As String
Dim unauthAttrTimestampTokenDer As String
Dim unauthAttrTimestampTokenTimestampSignatureVerified As Boolean
Dim unauthAttrTimestampTokenTstInfoTsaPolicyId As String
Dim unauthAttrTimestampTokenTstInfoMessageImprintHashAlg As String
Dim unauthAttrTimestampTokenTstInfoMessageImprintDigest As String
Dim unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches As Boolean
Dim unauthAttrTimestampTokenTstInfoSerialNumber As String
Dim unauthAttrTimestampTokenTstInfoGenTime As New Chilkat.DtObj
Dim j As Integer
Dim count_j As Integer

' Iterate over the hash algorithms used in the signature.
i = 0
count_i = json.SizeOfArray("pkcs7.verify.digestAlgorithms")
While i < count_i
    json.I = i
    strVal = json.StringOf("pkcs7.verify.digestAlgorithms[i]")
    i = i + 1
End While

' For each signer...
i = 0
count_i = json.SizeOfArray("pkcs7.verify.signerInfo")
While i < count_i
    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""") = True) Then
        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")
    End If


    ' signingTime
    If (json.HasMember("pkcs7.verify.signerInfo[i].authAttr.""1.2.840.113549.1.9.5""") = True) Then
        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)
    End If


    ' messageDigest
    If (json.HasMember("pkcs7.verify.signerInfo[i].authAttr.""1.2.840.113549.1.9.4""") = True) Then
        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")
    End If


    ' signingCertificateV2
    If (json.HasMember("pkcs7.verify.signerInfo[i].authAttr.""1.2.840.113549.1.9.16.2.47""") = True) Then
        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")
    End If


    ' --------------------------------
    ' 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""") = True) Then

        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.
        unauthAttrTimestampTokenTimestampSignatureVerified = 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
        unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches = 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
        count_j = json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.digestAlgorithms")
        While j < count_j
            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 + 1
        End While
        j = 0
        count_j = json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo")
        While j < count_j
            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 = j + 1
        End While

    End If


    i = i + 1
End While

If (success <> True) Then
    Debug.WriteLine(crypt.LastErrorText)
    Debug.WriteLine("CAdES-T verification failed.")
Else
    Debug.WriteLine("CAdES-T signature is valid.")
End If




 

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