Decrypt S/MIME with an Explicit Certificate and Private Key

See more MIME Examples

Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

Decrypt2 accepts the certificate and its private key directly as arguments.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

load ./chilkat.dll

set success 0

set mime [new_CkMime]

set success [CkMime_LoadMimeFile $mime "qa_data/encrypted.eml"]
if {$success == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    exit
}

#  Decrypt using an explicitly supplied certificate and private key.  The 1st argument is the
#  certificate and the 2nd is its private key.
set cert [new_CkCert]

set success [CkCert_LoadFromFile $cert "qa_data/recipient.cer"]
if {$success == 0} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkMime $mime
    delete_CkCert $cert
    exit
}

set privKey [new_CkPrivateKey]

set success [CkPrivateKey_LoadPemFile $privKey "qa_data/recipient_privkey.pem"]
if {$success == 0} then {
    puts [CkPrivateKey_lastErrorText $privKey]
    delete_CkMime $mime
    delete_CkCert $cert
    delete_CkPrivateKey $privKey
    exit
}

set success [CkMime_Decrypt2 $mime $cert $privKey]
if {$success == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    delete_CkCert $cert
    delete_CkPrivateKey $privKey
    exit
}

set body [CkMime_getBodyDecoded $mime]
if {[CkMime_get_LastMethodSuccess $mime] == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    delete_CkCert $cert
    delete_CkPrivateKey $privKey
    exit
}

puts "$body"

delete_CkMime $mime
delete_CkCert $cert
delete_CkPrivateKey $privKey