PureBasic

Get the Certificate an Email Was Encrypted By

Demonstrates the read-only Chilkat Email.EncryptedBy property. If the email was received encrypted, this property contains descriptive details of the certificate used for encryption. It is meaningful only when ReceivedEncrypted is true. To obtain a certificate object rather than descriptive text, use GetEncryptedByCert or LastDecryptCert. This example loads a received email and prints the encryption certificate details.

Background: In S/MIME encryption, the sender encrypts the message using the recipient's public-key certificate — a signed document that binds an identity (name and email) to a public key. EncryptedBy reports which certificate was used, letting the recipient confirm the message was encrypted specifically for them. To work with the certificate programmatically (inspecting its subject, issuer, expiration, etc.), request the Cert object via GetEncryptedByCert.

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IncludeFile "CkEmail.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  Demonstrates the Email.EncryptedBy property.
    ;  If the email was received encrypted, EncryptedBy contains the details of
    ;  the certificate used for encryption.  It is only meaningful when
    ;  ReceivedEncrypted is true.

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

    success = CkEmail::ckLoadEml(email,"qa_data/eml/encrypted.eml")
    If success = 0
        Debug CkEmail::ckLastErrorText(email)
        CkEmail::ckDispose(email)
        ProcedureReturn
    EndIf

    If CkEmail::ckReceivedEncrypted(email) = 1
        Debug "Encrypted by: " + CkEmail::ckEncryptedBy(email)
    Else
        Debug "This email was not received encrypted."
    EndIf



    CkEmail::ckDispose(email)


    ProcedureReturn
EndProcedure