Chilkat Examples

ChilkatHOME.NET Core C#Android™AutoItCC#C++Chilkat2-PythonCkPythonClassic ASPDataFlexDelphi ActiveXDelphi DLLGoJavaLianjaMono C#Node.jsObjective-CPHP ActiveXPHP ExtensionPerlPowerBuilderPowerShellPureBasicRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++VB.NETVBScriptVisual Basic 6.0Visual FoxProXojo Plugin

PureBasic Examples

Web API Categories

ASN.1
AWS KMS
AWS Misc
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Key Vault
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Code Signing
Compression
DKIM / DomainKey
DNS
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
Misc
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
SharePoint Online
Signing in the Cloud
Socket/SSL/TLS
Spider
Stream
Tar Archive
ULID/UUID
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(PureBasic) 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 PureBasic Module Download

Chilkat PureBasic Module

IncludeFile "CkBinData.pb"
IncludeFile "CkDkim.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkImap.pb"

Procedure ChilkatExample()

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

    imap.i = CkImap::ckCreate()
    If imap.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Connect to an IMAP server, login, select mailbox..
    ; Use TLS 
    CkImap::setCkSsl(imap, 1)
    CkImap::setCkPort(imap, 993)
    success.i = CkImap::ckConnect(imap,"imap.someMailServer.com")
    If success = 1
        success = CkImap::ckLogin(imap,"myLogin","myPassword")
        If success = 1
            success = CkImap::ckSelectMailbox(imap,"Inbox")
        EndIf

    EndIf

    If success <> 1
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        ProcedureReturn
    EndIf

    dkim.i = CkDkim::ckCreate()
    If dkim.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

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

    ; Download emails by sequence numbers (not UIDs).
    bUid.i = 0
    seqNum.i
    j.i
    n.i = CkImap::ckNumMessages(imap)
    If n > 10
        n = 10
    EndIf

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::setCkEmitCompact(json, 0)

    ; To verify DKIM-Signature headers, we need the exact unmodified MIME bytes of each email.
    mimeData.i = CkBinData::ckCreate()
    If mimeData.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    seqNum = 1
    While seqNum <= n
        ; The FetchSingleBd method was introduced in v9.5.0.76
        success = CkImap::ckFetchSingleBd(imap,seqNum,bUid,mimeData)
        If success <> 1
            Debug CkImap::ckLastErrorText(imap)
            CkImap::ckDispose(imap)
            CkDkim::ckDispose(dkim)
            CkJsonObject::ckDispose(json)
            CkBinData::ckDispose(mimeData)
            ProcedureReturn
        EndIf

        ; Get the number of DKIM-Signature headers.
        numDkim.i = CkDkim::ckNumDkimSigs(dkim,mimeData)

        ; Verify each..
        j = 0
        While j < numDkim
            Debug "------ DKIM Signature " + Str(j)

            success = CkDkim::ckDkimVerify(dkim,j,mimeData)
            If success <> 1
                Debug "Not valid."
            Else
                Debug "valid."
            EndIf

            ; Show the additional information about the signature verification
            CkJsonObject::ckLoad(json,CkDkim::ckVerifyInfo(dkim))
            Debug CkJsonObject::ckEmit(json)

            ; 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
        Wend
        seqNum = seqNum + 1
    Wend

    success = CkImap::ckDisconnect(imap)


    CkImap::ckDispose(imap)
    CkDkim::ckDispose(dkim)
    CkJsonObject::ckDispose(json)
    CkBinData::ckDispose(mimeData)


    ProcedureReturn
EndProcedure

 

© 2000-2024 Chilkat Software, Inc. All Rights Reserved.