Tcl

Examine KeyInfo Certificate in XML Signature

See more XML Digital Signatures Examples

This example loads signed XML and gets the signing certificate, assuming the certificate is contained in X509Certificate within the KeyInfo. Tcl

load ./chilkat.dll

set success 0

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

set dsig [new_CkXmlDSig]

set sbXml [new_CkStringBuilder]

set success [CkStringBuilder_LoadFile $sbXml "c:/aaworkarea/elias/3/face_f09006808443a699d1b.xml" "utf-8"]
if {$success != 1} then {
    puts "Failed to load XML file."
    delete_CkXmlDSig $dsig
    delete_CkStringBuilder $sbXml
    exit
}

set success [CkXmlDSig_LoadSignatureSb $dsig $sbXml]
if {$success != 1} then {
    puts [CkXmlDSig_lastErrorText $dsig]
    delete_CkXmlDSig $dsig
    delete_CkStringBuilder $sbXml
    exit
}

# Get the KeyInfo XML.
# xmlKeyInfo is a CkXml
set xmlKeyInfo [CkXmlDSig_GetKeyInfo $dsig]
if {[CkXmlDSig_get_LastMethodSuccess $dsig] != 1} then {
    puts [CkXmlDSig_lastErrorText $dsig]
    delete_CkXmlDSig $dsig
    delete_CkStringBuilder $sbXml
    exit
}

puts [CkXml_getXml $xmlKeyInfo]
puts "----"

# Assuming the X509Certificate is in the KeyInfo, it will look like this:

#   <ds:KeyInfo Id="...">
#     <ds:KeyValue>
#     ...  
#     <ds:X509Data>
#       <ds:X509Certificate>MIIHAz...</ds:X509Certificate>
#     </ds:X509Data>
#   </ds:KeyInfo>
set certBase64 [CkXml_getChildContent $xmlKeyInfo "*:X509Data|*:X509Certificate"]
if {[CkXml_get_LastMethodSuccess $xmlKeyInfo] != 1} then {
    puts "No X509Certificate found in the KeyInfo."
    delete_CkXmlDSig $dsig
    delete_CkStringBuilder $sbXml
    exit
}

# Load a certificate object w/ the base64.
set cert [new_CkCert]

set success [CkCert_LoadFromBase64 $cert $certBase64]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkXmlDSig $dsig
    delete_CkStringBuilder $sbXml
    delete_CkCert $cert
    exit
}

# Examine the cert..
puts "SubjectDN: [CkCert_subjectDN $cert]"
puts "IssuerDN: [CkCert_issuerDN $cert]"
puts "SerialNumber as Decimal: [CkCert_serialDecimal $cert]"

delete_CkXml $xmlKeyInfo


delete_CkXmlDSig $dsig
delete_CkStringBuilder $sbXml
delete_CkCert $cert