(Tcl) DKIM Signature using Windows Current User Certificate Store

This is a Windows-specific example to load a certificate from the Current User (registry-based) certificate store, and then use the certificate's associated private key for a DKIM signature.

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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.

set cert [new_CkCert]

# The LoadByCommonName method searches the Windows Local Machine and Current User 
# registry-based certificate stores for a certificate having the common name specified. 
# If found, the certificate is loaded and ready for use.
set success [CkCert_LoadByCommonName $cert "My Certificate ABC"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkCert $cert
    exit
}

# The certificate must have an associated private key installed, and it must be a
# private key that has been marked "exportable" when it was originally installed.
if {![CkCert_HasPrivateKey $cert]} then {
    puts "This certificate does not have a private key available."
    delete_CkCert $cert
    exit
}

# privKey is a CkPrivateKey

set privKey [CkCert_ExportPrivateKey $cert]
if {[CkCert_get_LastMethodSuccess $cert] == 0} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkCert $cert
    exit
}

set dkim [new_CkDkim]

# Load the private key into the DKIM object:
set success [CkDkim_LoadDkimPk $dkim [CkPrivateKey_getPkcs8Pem $privKey] ""]
if {$success != 1} then {
    puts [CkDkim_lastErrorText $dkim]
    delete_CkCert $cert
    delete_CkDkim $dkim
    exit
}

# The private key has been loaded into the DKIM object.  See the other DKIM
# examples for guidance on how to create a DKIM signature...

delete_CkPrivateKey $privKey


delete_CkCert $cert
delete_CkDkim $dkim