Chilkat Examples

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

DataFlex Examples

Web API Categories

ASN.1
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Service Bus
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
ECC
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
Geolocation
Google APIs
Google Calendar
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
Microsoft Graph
NTLM
OAuth1
OAuth2
OneDrive
OpenSSL
Outlook
PEM
PFX/P12
POP3
PRNG
REST
REST Misc
RSA
SCP
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(DataFlex) Verify DKIM-Signature Headers in Downloaded Email

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoImap
    Boolean iSuccess
    Handle hoDkim
    Boolean iBUid
    Integer iSeqNum
    Integer j
    Integer n
    Handle hoJson
    Variant vMimeData
    Handle hoMimeData
    Integer iNumDkim
    String sTemp1

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

    Get Create (RefClass(cComChilkatImap)) To hoImap
    If (Not(IsComObjectCreated(hoImap))) Begin
        Send CreateComObject of hoImap
    End

    // Connect to an IMAP server, login, select mailbox..
    // Use TLS 
    Set ComSsl Of hoImap To True
    Set ComPort Of hoImap To 993
    Get ComConnect Of hoImap "imap.someMailServer.com" To iSuccess
    If (iSuccess = True) Begin
        Get ComLogin Of hoImap "myLogin" "myPassword" To iSuccess
        If (iSuccess = True) Begin
            Get ComSelectMailbox Of hoImap "Inbox" To iSuccess
        End

    End

    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatDkim)) To hoDkim
    If (Not(IsComObjectCreated(hoDkim))) Begin
        Send CreateComObject of hoDkim
    End

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

    // Download emails by sequence numbers (not UIDs).
    Move False To iBUid

    Get ComNumMessages Of hoImap To n
    If (n > 10) Begin
        Move 10 To n
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Set ComEmitCompact Of hoJson To False

    // To verify DKIM-Signature headers, we need the exact unmodified MIME bytes of each email.
    Get Create (RefClass(cComChilkatBinData)) To hoMimeData
    If (Not(IsComObjectCreated(hoMimeData))) Begin
        Send CreateComObject of hoMimeData
    End
    Move 1 To iSeqNum
    While (iSeqNum <= n)
        // The FetchSingleBd method was introduced in v9.5.0.76
        Get pvComObject of hoMimeData to vMimeData
        Get ComFetchSingleBd Of hoImap iSeqNum iBUid vMimeData To iSuccess
        If (iSuccess <> True) Begin
            Get ComLastErrorText Of hoImap To sTemp1
            Showln sTemp1
            Procedure_Return
        End

        // Get the number of DKIM-Signature headers.
        Get pvComObject of hoMimeData to vMimeData
        Get ComNumDkimSigs Of hoDkim vMimeData To iNumDkim

        // Verify each..
        Move 0 To j
        While (j < iNumDkim)
            Showln "------ DKIM Signature " j

            Get pvComObject of hoMimeData to vMimeData
            Get ComDkimVerify Of hoDkim j vMimeData To iSuccess
            If (iSuccess <> True) Begin
                Showln "Not valid."
            End
            Else Begin
                Showln "valid."
            End

            // Show the additional information about the signature verification
            Get ComVerifyInfo Of hoDkim To sTemp1
            Get ComLoad Of hoJson sTemp1 To iSuccess
            Get ComEmit Of hoJson To sTemp1
            Showln sTemp1

            // 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"
            // 	}

            Move j + 1 To j
        Loop

        Move iSeqNum + 1 To iSeqNum
    Loop

    Get ComDisconnect Of hoImap To iSuccess


End_Procedure

 

© 2000-2019 Chilkat Software, Inc. All Rights Reserved.