(Tcl) 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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load ./chilkat.dll

# 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.
set mailman [new_CkMailMan]

# Set the SMTP server.
CkMailMan_put_SmtpHost $mailman "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.
set cert [new_CkCert]

set success [CkCert_LoadFromFile $cert "cknotes.cer"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkMailMan $mailman
    delete_CkCert $cert
    exit
}

# Create a new email object
set email [new_CkEmail]

CkEmail_put_Subject $email "This email is encrypted"
CkEmail_put_Body $email "This is a digitally encrypted mail"
CkEmail_put_From $email "Chilkat Support <support@chilkatsoft.com>"
set success [CkEmail_AddTo $email "Chilkat Blog" "admin@cknotes.com"]

# Indicate that the email is to be sent encrypted.
CkEmail_put_SendEncrypted $email 1

# Specify the certificate to be used for encryption.
set success [CkEmail_SetEncryptCert $email $cert]

# If desired, specify the encryption algorithm to be used.
# The Pkcs7CryptAlg property can be set to "aes", "des", "3des", or "rc2"
CkEmail_put_Pkcs7CryptAlg $email "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.
CkEmail_put_Pkcs7KeyLength $email 192

set success [CkMailMan_SendEmail $mailman $email]
if {$success != 1} then {
    puts [CkMailMan_lastErrorText $mailman]
} else {
    puts "Mail Sent!"
}


delete_CkMailMan $mailman
delete_CkCert $cert
delete_CkEmail $email