(Tcl) Sign JSON to Create CAdES P7S Bytes

Demonstrates how to sign JSON using a certificate + private key from a .p12/.pfx to create a CAdES P7S byte array.

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load ./chilkat.dll

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

set crypt [new_CkCrypt2]

set cert [new_CkCert]

set success [CkCert_LoadPfxFile $cert "qa_data/pfx/cert_test123.pfx" "test123"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    exit
}

# Tell the crypt component to use this cert.
set success [CkCrypt2_SetSigningCert $crypt $cert]
if {$success != 1} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    exit
}

# The CadesEnabled property applies to all methods that create PKCS7 signatures. 
# To create a CAdES-BES signature, set this property equal to true. 
CkCrypt2_put_CadesEnabled $crypt 1

CkCrypt2_put_HashAlgorithm $crypt "sha256"

set jsonSigningAttrs [new_CkJsonObject]

CkJsonObject_UpdateInt $jsonSigningAttrs "contentType" 1
CkJsonObject_UpdateInt $jsonSigningAttrs "signingTime" 1
CkJsonObject_UpdateInt $jsonSigningAttrs "messageDigest" 1
CkJsonObject_UpdateInt $jsonSigningAttrs "signingCertificateV2" 1
CkCrypt2_put_SigningAttributes $crypt [CkJsonObject_emit $jsonSigningAttrs]

# By default, all the certs in the chain of authentication are included in the signature.
# If desired, we can choose to only include the signing certificate:
CkCrypt2_put_IncludeCertChain $crypt 0

# Create the CAdES-BES attached signature, which contains the original data.
CkCrypt2_put_Charset $crypt "utf-8"
set cadesP7s [new_CkByteData]

set success [CkCrypt2_OpaqueSignString $crypt "{ \"abc\": 123}" $cadesP7s]
if {[CkCrypt2_get_LastMethodSuccess $crypt] == 0} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    delete_CkJsonObject $jsonSigningAttrs
    delete_CkByteData $cadesP7s
    exit
}

# Verify the signature and extract the original JSON:
set originalJson [CkCrypt2_opaqueVerifyString $crypt $cadesP7s]
if {[CkCrypt2_get_LastMethodSuccess $crypt] == 0} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkCrypt2 $crypt
    delete_CkCert $cert
    delete_CkJsonObject $jsonSigningAttrs
    delete_CkByteData $cadesP7s
    exit
}

puts "Original JSON: $originalJson"

puts "Success!"

delete_CkCrypt2 $crypt
delete_CkCert $cert
delete_CkJsonObject $jsonSigningAttrs
delete_CkByteData $cadesP7s