DataFlex
which in turn contains an X509SKI element which contains only the signing certificate's Subject Key Identifier (SKI).
DataFlex
Verify XML Signature having KeyInfo / X509Data / X509SKI
See more XML Digital Signatures Examples
This example demonstrates how to verify an XML Digital Signature where the KeyInfo element contains an X509Data element,which in turn contains an X509SKI element which contains only the signing certificate's Subject Key Identifier (SKI).
Chilkat DataFlex Downloads
Use ChilkatAx-win32.pkg
Procedure Test
Boolean iSuccess
String sSignedSoapXmlUrl
Handle hoHttp
Variant vSbXml
Handle hoSbXml
Variant vSbCertPem
Handle hoSbCertPem
Variant vCertVault
Handle hoCertVault
Handle hoVerifier
Boolean iBVerified
String sTemp1
Move False To iSuccess
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// The SOAP XML with digital signature verified in this example is available at
// https://www.chilkatsoft.com/exampleData/sigWithX509SKI.xml
Move "https://www.chilkatsoft.com/exampleData/sigWithX509SKI.xml" To sSignedSoapXmlUrl
// First, let's get the signed SOAP XML..
Get Create (RefClass(cComChilkatHttp)) To hoHttp
If (Not(IsComObjectCreated(hoHttp))) Begin
Send CreateComObject of hoHttp
End
Get Create (RefClass(cComChilkatStringBuilder)) To hoSbXml
If (Not(IsComObjectCreated(hoSbXml))) Begin
Send CreateComObject of hoSbXml
End
Get pvComObject of hoSbXml to vSbXml
Get ComQuickGetSb Of hoHttp sSignedSoapXmlUrl vSbXml To iSuccess
If (iSuccess <> True) Begin
Get ComLastErrorText Of hoHttp To sTemp1
Showln sTemp1
Procedure_Return
End
// The signed XML downloaded from the above URL contains the following.
// <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
// <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
// <SOAP-ENV:Header>
// <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"><ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"><InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="wsse SOAP-ENV"/></ds:CanonicalizationMethod><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#Body"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><ds:DigestValue>PIiVPpuMc1jGpWaL8ftzTOcc4gc=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>Rlta8LplnFH0q8L+UeVmh4Smdn6oVETi4RoUmpT/KQX3RNAIOdCVE3b7gjmx5+3vp3DhjphOsZvW6dXzkI46xt9pD5otp3b/ZppGqKzltggo9gyQtPvJ8ltJZqVKYOGo5uElRFF/xm/zcx5Y3E14t+LYVSlv2lbem/zZ5zQ7ai8DmGD33id7nGu+MXVwb3kGkJFYoB/GOXtwsep+bcilMglTp8/7SBfBaVFKxWVBp4N2NW7bGlyDct8FaCk9hXQDNm/kqne9GU87tgh8/rbsFCYgyqIRMIvMPvhRWr2EKdEKyLtlZ8w0KYJYpgsf4T7SDghemzXkJoJPrfUQmHudIw==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509SKI>bDMtm8bAimMlGLU2M/82W8+y3tM=</ds:X509SKI></ds:X509Data></ds:KeyInfo></ds:Signature></wsse:Security>
// </SOAP-ENV:Header>
// <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
// <z:FooBar xmlns:z="http://example.com" />
// </SOAP-ENV:Body>
// </SOAP-ENV:Envelope>
// Note: We don't have everything we need to verify the signature.
// The KeyInfo part of the Signature contains only the signing cert's Subject Key Identifier.
// We must obtain the certificate locally using this information.
//
// On a Windows system, if the matching certificate is already installed in the registry-based
// certificate stores, then your application does not need to do anything. Chilkat will automatically
// locate and use the matching certificate installed on the Windows system.
//
// This example will assume we're not on a Windows system, or that the matching certificate
// is not already installed on the system.
//
// One strategy for providing certificates to the application doing the XML signature verification
// is to load all possible certificates into an in-memory XmlCertVault beforehand, and then call
// UseCertVault to allow for Chilkat to automatically find the matching cert from the pre-loaded certificates.
// We'll do that here with the one certificate that we already know is the matching certificate.
Get Create (RefClass(cComChilkatStringBuilder)) To hoSbCertPem
If (Not(IsComObjectCreated(hoSbCertPem))) Begin
Send CreateComObject of hoSbCertPem
End
Get pvComObject of hoSbCertPem to vSbCertPem
Get ComQuickGetSb Of hoHttp "https://chilkatdownload.com/example_data/testcertificate.pem" vSbCertPem To iSuccess
If (iSuccess <> True) Begin
Get ComLastErrorText Of hoHttp To sTemp1
Showln sTemp1
Procedure_Return
End
// Create a cert vault and add the certificates.
// In this example, we're only adding a single certificate. An application
// could load many certificates into the cert vault..
Get Create (RefClass(cComChilkatXmlCertVault)) To hoCertVault
If (Not(IsComObjectCreated(hoCertVault))) Begin
Send CreateComObject of hoCertVault
End
Get ComGetAsString Of hoSbCertPem To sTemp1
Get ComAddCertString Of hoCertVault sTemp1 To iSuccess
If (iSuccess <> True) Begin
Get ComLastErrorText Of hoCertVault To sTemp1
Showln sTemp1
Procedure_Return
End
Get Create (RefClass(cComChilkatXmlDSig)) To hoVerifier
If (Not(IsComObjectCreated(hoVerifier))) Begin
Send CreateComObject of hoVerifier
End
// Tell the verifier to use the certVault as a source for locating
// matching certificates.
Get pvComObject of hoCertVault to vCertVault
Get ComUseCertVault Of hoVerifier vCertVault To iSuccess
Get pvComObject of hoSbXml to vSbXml
Get ComLoadSignatureSb Of hoVerifier vSbXml To iSuccess
If (iSuccess <> True) Begin
Get ComLastErrorText Of hoVerifier To sTemp1
Showln sTemp1
Procedure_Return
End
Get ComVerifySignature Of hoVerifier True To iBVerified
If (iBVerified <> True) Begin
Get ComLastErrorText Of hoVerifier To sTemp1
Showln sTemp1
Procedure_Return
End
Showln "Signature verified!"
End_Procedure