(Tcl) Create PKCS7 Attached/Opaque Signature (S/MIME)

Create an S/MIME message with a PKCS7 attached/opaque signature.

Chilkat Tcl Extension Downloads Chilkat Tcl Extension Downloads

load ./chilkat.dll

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set mime [new_CkMime]

# Load a certificate w/ private key for signing.
# There are many ways of getting a certificate object:
# from a pfx file, from .cer and private-key files, from the
# Windows registry-based certificate stores, etc.
# Load a PFX file into a certificate object.
set cert [new_CkCert]

set pfxFilepath "pfxFiles/something.pfx"
set pfxPassword "secret"
set success [CkCert_LoadPfxFile $cert $pfxFilepath $pfxPassword]
if {$success == 0} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkMime $mime
    delete_CkCert $cert
    exit
}

# Create a very simple MIME message to be signed:
set success [CkMime_AddHeaderField $mime "Subject" "This is a test"]
set success [CkMime_AddHeaderField $mime "MyCustomHeader" "abc123"]
CkMime_put_ContentType $mime "text/plain"
CkMime_SetBody $mime "This is a plain-text body."

# Examine the MIME prior to signing:
puts "--- MIME prior to signing ---"
puts [CkMime_getMime $mime]

# The MIME prior to signing looks like this:
# -------------------------------------------------------------------------------

# Subject: This is a test
# MyCustomHeader: abc123
# Content-Type: text/plain
# 
# This is a plain-text body.

# -------------------------------------------------------------------------------

# The default hash algorithm used in the signing process is "SHA1".
# To change it, set the SigningHashAlg property:
CkMime_put_SigningHashAlg $mime "SHA256"

# Convert the MIME to PKCS7 signed-data.
set success [CkMime_ConvertToSigned $mime $cert]
if {$success == 0} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkMime $mime
    delete_CkCert $cert
    exit
}

# Examine the signed MIME
puts "--- MIME converted to PKCS7 signed-data ---"
puts [CkMime_getMime $mime]

# The MIME after signing looks like this:
# -------------------------------------------------------------------------------

# Subject: This is a test
# MyCustomHeader: abc123
# Content-Disposition: attachment; filename="smime.p7m"
# Content-Transfer-Encoding: base64
# Content-Type: application/x-pkcs7-mime;
#  name="smime.p7m"; smime-type="signed-data"
# 
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# aQRnU3ViamVjdDogVGhpcyBpcyBhIHRlc3QNCk15Q3VzdG9tSGVhZGVyOiBhYmMxMjMNCkNvbnRl
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# 

# ------------------------------------------------------------------------------

delete_CkMime $mime
delete_CkCert $cert