(Visual FoxPro) 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.)

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loMailman
LOCAL loCert
LOCAL lnSuccess
LOCAL loEmail

* 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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.MailMan')
loMailman = CreateObject('Chilkat.MailMan')

* Set the SMTP server.
loMailman.SmtpHost = "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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadFromFile("cknotes.cer")
IF (lnSuccess <> 1) THEN
    ? loCert.LastErrorText
    RELEASE loMailman
    RELEASE loCert
    CANCEL
ENDIF

* Create a new email object
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Email')
loEmail = CreateObject('Chilkat.Email')

loEmail.Subject = "This email is encrypted"
loEmail.Body = "This is a digitally encrypted mail"
loEmail.From = "Chilkat Support <support@chilkatsoft.com>"
lnSuccess = loEmail.AddTo("Chilkat Blog","admin@cknotes.com")

* Indicate that the email is to be sent encrypted.
loEmail.SendEncrypted = 1

* Specify the certificate to be used for encryption.
lnSuccess = loEmail.SetEncryptCert(loCert)

* If desired, specify the encryption algorithm to be used.
* The Pkcs7CryptAlg property can be set to "aes", "des", "3des", or "rc2"
loEmail.Pkcs7CryptAlg = "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.
loEmail.Pkcs7KeyLength = 192

lnSuccess = loMailman.SendEmail(loEmail)
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
ELSE
    ? "Mail Sent!"
ENDIF

RELEASE loMailman
RELEASE loCert
RELEASE loEmail