Set the Decryption Certificate for an Email

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Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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    success := false

    //  Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
    //  access to its private key) for decrypting a received encrypted email.  Set the cert
    //  before loading the encrypted email so it can be decrypted automatically.

    email := chilkat.NewEmail()

    //  Load a certificate together with its private key from a PFX file.
    cert := chilkat.NewCert()
    success = cert.LoadPfxFile("qa_data/certs/decryption.pfx","pfx_password")
    if success == false {
        fmt.Println(cert.LastErrorText())
        email.DisposeEmail()
        cert.DisposeCert()
        return
    }

    //  Provide the certificate to use for decryption.
    success = email.SetDecryptCert(cert)
    if success == false {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        cert.DisposeCert()
        return
    }

    //  Load the encrypted email; Chilkat decrypts it using the certificate.
    success = email.LoadEml("qa_data/eml/encrypted.eml")
    if success == false {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        cert.DisposeCert()
        return
    }

    fmt.Println("ReceivedEncrypted = ", email.ReceivedEncrypted())
    fmt.Println("Decrypted = ", email.Decrypted())

    //  Note: Paths such as "qa_data/..." are relative local filesystem paths,
    //  relative to the current working directory of the running application.

    email.DisposeEmail()
    cert.DisposeCert()