Add a Detached Signature (Separate Key, Header Control)

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Demonstrates the Chilkat Mime.AddDetachedSignaturePk2 method, which creates a detached signature with a separately supplied certificate and private key, and a third argument controlling transfer of the existing message header fields to the new outer entity.

Note: 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_SetBodyFromPlainText $mime "This message will be signed."]
if {$success == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    exit
}

#  Load the certificate and its private key separately.
set cert [new_CkCert]

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

set privKey [new_CkPrivateKey]

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

#  Create a detached signature with separately supplied cert and private key, where the 3rd
#  argument controls whether the existing message header fields are transferred to the new outer
#  multipart/signed entity.
set transferHeaderFields 1
set success [CkMime_AddDetachedSignaturePk2 $mime $cert $privKey $transferHeaderFields]
if {$success == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    delete_CkCert $cert
    delete_CkPrivateKey $privKey
    exit
}

set success [CkMime_SaveMime $mime "qa_output/signed.eml"]
if {$success == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    delete_CkCert $cert
    delete_CkPrivateKey $privKey
    exit
}

puts "Detached signature added (headers transferred)."

delete_CkMime $mime
delete_CkCert $cert
delete_CkPrivateKey $privKey