Set the Decryption Certificate and Private Key

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Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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    success := false

    //  Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
    //  corresponding private key (as separate objects) for decrypting a received encrypted
    //  email.  Set them before loading the encrypted email.

    email := chilkat.NewEmail()

    //  Load the certificate (public) and the matching private key from separate files.
    cert := chilkat.NewCert()
    success = cert.LoadFromFile("qa_data/certs/recipient.cer")
    if success == false {
        fmt.Println(cert.LastErrorText())
        email.DisposeEmail()
        cert.DisposeCert()
        return
    }

    privKey := chilkat.NewPrivateKey()
    success = privKey.LoadPemFile("qa_data/certs/recipient_privkey.pem")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        email.DisposeEmail()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

    //  Provide the certificate and private key to use for decryption.
    success = email.SetDecryptCert2(cert,privKey)
    if success == false {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

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

    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()
    privKey.DisposePrivateKey()