Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

Excel Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Azure Cloud Storage
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(Excel) Verify DomainKey-Signature Headers in Downloaded Email

Downloads email from an IMAP server and verifies the DomainKey-Signature header(s) in each email, if present.

Note: DKIM-Signatures are much more common than DomainKey-Signatures. See the other Chilkat example for verifying DKIM-Signatures (link in the code below).

Download Excel Class Modules

Chilkat Excel Class Modules

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

Dim imap As Chilkat.Imap
Set imap = Chilkat.NewImap

' Connect to an IMAP server, login, select mailbox..
' Use TLS 
imap.Ssl = True
imap.Port = 993

success = imap.Connect("imap.someMailServer.com")
If (success = True) Then
    success = imap.Login("myLogin","myPassword")
    If (success = True) Then
        success = imap.SelectMailbox("Inbox")
    End If

End If

If (success <> True) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Note: DKIM-Signatures are much more common than DomainKey-Signature
' See DKIM-Signature Verify Sample.

Dim dkim As Chilkat.Dkim
Set dkim = Chilkat.NewDkim

' Download a max of 10 emails and verify any DomainKey-Signature headers
' that are present.

' Download emails by sequence numbers (not UIDs).

bUid = False


n = imap.NumMessages
If (n > 50) Then
    n = 50
End If

Dim json As Chilkat.JsonObject
Set json = Chilkat.NewJsonObject
json.EmitCompact = False

' To verify DomainKey-Signature headers, we need the exact unmodified MIME bytes of each email.
Dim mimeData As Chilkat.BinData
Set mimeData = Chilkat.NewBinData
seqNum = 1
Do While seqNum <= n
    ' The FetchSingleBd method was introduced in v9.5.0.76
    success = imap.FetchSingleBd(seqNum,bUid,mimeData)
    If (success <> True) Then
        Debug.Print imap.LastErrorText
        Exit Sub
    End If

    ' Note: DKIM-Signatures are much more common than DomainKey-Signature
    ' See DKIM-Signature Verify Sample.

    ' Get the number of DomainKey-Signature headers.

    numSigs = dkim.NumDomainKeySigs(mimeData)

    ' Verify each..
    j = 0
    Do While j < numSigs
        Debug.Print "------ DomainKey Signature "; j

        success = dkim.DomainKeyVerify(j,mimeData)
        If (success <> True) Then
            Debug.Print "Not valid."
            Debug.Print dkim.LastErrorText
        Else
            Debug.Print "valid."
        End If

        ' Show the additional information about the signature verification
        success = json.Load(dkim.VerifyInfo)
        Debug.Print json.Emit()

        ' The JSON contains information such as this:

        ' 	{
        ' 	  "domain": "amazonses.com",
        ' 	  "selector": "7v7vs6w47njt4pimodk5mmttbegzsi6n",
        ' 	  "publicKey": "MIGfMA0GCSqG...v2GvWPqGHz6uqeQIDAQAB",
        ' 	  "canonicalization": "relaxed/simple",
        ' 	  "algorithm": "rsa-sha256",
        ' 	  "signedHeaders": "Subject:From:To:Date:Mime-Version:Content-Type:References:Message-Id:Feedback-ID",
        ' 	  "verified": "yes"
        ' 	}

        j = j + 1
    Loop
    seqNum = seqNum + 1
Loop

success = imap.Disconnect()

 

© 2000-2022 Chilkat Software, Inc. All Rights Reserved.