(Tcl) Duplicate OpensSSL to Sign File and Output Binary DER

This example duplicates the following:

openssl smime -sign -in INPUT.xml -signer SIGN.PEM -passin pass:MYPASS -outform der -binary -nodetach -out SIGNED.P7M

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

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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 crypt [new_CkCrypt2]

# Load the PEM containing cert + private key.
set pem [new_CkPem]

set success [CkPem_LoadPemFile $pem "qa_data/pem/myPem.pem" "password"]
if {$success != 1} then {
    puts [CkPem_lastErrorText $pem]
    delete_CkCrypt2 $crypt
    delete_CkPem $pem
    exit
}

# privkey is a CkPrivateKey
set privkey [CkPem_GetPrivateKey $pem 0]
if {[CkPem_get_LastMethodSuccess $pem] != 1} then {
    puts [CkPem_lastErrorText $pem]
    delete_CkCrypt2 $crypt
    delete_CkPem $pem
    exit
}

# cert is a CkCert
set cert [CkPem_GetCert $pem 0]
if {[CkPem_get_LastMethodSuccess $pem] != 1} then {
    delete_CkPrivateKey $privkey

    puts [CkPem_lastErrorText $pem]
    delete_CkCrypt2 $crypt
    delete_CkPem $pem
    exit
}

set success [CkCrypt2_SetSigningCert2 $crypt $cert $privkey]
if {$success != 1} then {
    delete_CkPrivateKey $privkey

    delete_CkCert $cert

    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkPem $pem
    exit
}

delete_CkPrivateKey $privkey

delete_CkCert $cert

# Alternatively, we could use a .pfx/.p12 file.
# (Chilkat also supports other formats/sources for cert/private keys...)
set certFromP12 [new_CkCert]

set success [CkCert_LoadPfxFile $certFromP12 "qa_data/p12/myP12.p12" "password"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $certFromP12]
    delete_CkCrypt2 $crypt
    delete_CkPem $pem
    delete_CkCert $certFromP12
    exit
}

# The certificate, when loaded from a .pfx/.p12, will automatically 
# include the associated private key, assuming it's present in the .p12.
# We don't have to explicitly provide the private key as in the
# lines of code above that use the PEM file.
set success [CkCrypt2_SetSigningCert $crypt $certFromP12]
if {$success != 1} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkPem $pem
    delete_CkCert $certFromP12
    exit
}

# Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
set success [CkCrypt2_CreateP7M $crypt "qa_data/infile.anything" "qa_output/outfile.p7m"]
if {$success != 1} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkPem $pem
    delete_CkCert $certFromP12
    exit
}

puts "Success."

delete_CkCrypt2 $crypt
delete_CkPem $pem
delete_CkCert $certFromP12