(Go) Send Encrypted Email with a Selected Algorithm (AES, 3DES, etc.)

Sends an encrypted email using the recipient's digital certificate from a .cer file, and chooses 3DES for the encryption algorithm. (It is also possible to send AES encrypted email w/ 128-bit, 192-bit, or 256-bit encryption simply by setting the Pkcs7CryptAlg and Pkcs7KeyLength properties.)

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

    // The mailman object is used for sending and receiving email.
    mailman := chilkat.NewMailMan()

    // Set the SMTP server.
    mailman.SetSmtpHost("smtp.mymailserver.com")

    // Load the .cer file into a certificate object.
    // When sending S/MIME encrypted email, it is the recipient's
    // certificate that is used for encryption.  Only the public key
    // is needed to encrypt.  The recipient is the only
    // one possessing the private key, and therefore is the only
    // one able to decrypt.
    cert := chilkat.NewCert()
    success := cert.LoadFromFile("cknotes.cer")
    if success != true {
        fmt.Println(cert.LastErrorText())
        mailman.DisposeMailMan()
        cert.DisposeCert()
        return
    }

    // Create a new email object
    email := chilkat.NewEmail()

    email.SetSubject("This email is encrypted")
    email.SetBody("This is a digitally encrypted mail")
    email.SetFrom("Chilkat Support <support@chilkatsoft.com>")
    success = email.AddTo("Chilkat Blog","admin@cknotes.com")

    // Indicate that the email is to be sent encrypted.
    email.SetSendEncrypted(true)

    // Specify the certificate to be used for encryption.
    success = email.SetEncryptCert(cert)

    // If desired, specify the encryption algorithm to be used.
    // The Pkcs7CryptAlg property can be set to "aes", "des", "3des", or "rc2"
    email.SetPkcs7CryptAlg("3des")

    // If desired, set the key length (in bits) for the encryption algorithm:
    // The possible values allowed depend on the Pkcs7CryptAlg property. 
    // For "aes", the key length may be 128, 192, or 256. 
    // For "3des" the key length must be 192. 
    // For "des" the key length must be 40. 
    // For "rc2" the key length can be 40, 56, 64, or 128.
    email.SetPkcs7KeyLength(192)

    success = mailman.SendEmail(email)
    if success != true {
        fmt.Println(mailman.LastErrorText())
    }
    else {
        fmt.Println("Mail Sent!")
    }


    mailman.DisposeMailMan()
    cert.DisposeCert()
    email.DisposeEmail()