Tcl

Set the Decryption Certificate for an Email

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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Tcl


load ./chilkat.dll

set success 0

#  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.

set email [new_CkEmail]

#  Load a certificate together with its private key from a PFX file.
set cert [new_CkCert]

set success [CkCert_LoadPfxFile $cert "qa_data/certs/decryption.pfx" "pfx_password"]
if {$success == 0} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkEmail $email
    delete_CkCert $cert
    exit
}

#  Provide the certificate to use for decryption.
set success [CkEmail_SetDecryptCert $email $cert]
if {$success == 0} then {
    puts [CkEmail_lastErrorText $email]
    delete_CkEmail $email
    delete_CkCert $cert
    exit
}

#  Load the encrypted email; Chilkat decrypts it using the certificate.
set success [CkEmail_LoadEml $email "qa_data/eml/encrypted.eml"]
if {$success == 0} then {
    puts [CkEmail_lastErrorText $email]
    delete_CkEmail $email
    delete_CkCert $cert
    exit
}

puts "ReceivedEncrypted = [CkEmail_get_ReceivedEncrypted $email]"
puts "Decrypted = [CkEmail_get_Decrypted $email]"

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

delete_CkEmail $email
delete_CkCert $cert