Xojo Plugin

Verify XML Signature having KeyInfo / X509Data / X509Certificate

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 X509Certificate element which contains the base64-encoded certificate. Xojo Plugin

Dim success As Boolean
success = False

// 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/sigWithX509Certificate.xml

Dim signedSoapXmlUrl As String
signedSoapXmlUrl = "https://www.chilkatsoft.com/exampleData/sigWithX509Certificate.xml"

// First, let's get the signed SOAP XML..
Dim http As New Chilkat.Http
Dim sbXml As New Chilkat.StringBuilder
success = http.QuickGetSb(signedSoapXmlUrl,sbXml)
If (success <> True) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

// The signed XML downloaded from the above URL contains the following.
// Note: Everything we need to verify the signature is already available within the signed XML.
// The KeyInfo part of the Signature contains the X.509 certificate in base64 format,
// and the public key used to verify the signature is contained within the X.509.
// Chilkat automatically fetches and uses the public key from the base64 certificate.
// 

// <?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>dlSGYRtxv8DiGQ9THPEdPTlbwjkidCUEutVWkqhnjzKOxjl6EZPp6ibf7ogrn1QJAabo7eb/d2UjD8LXzQYB+q9OmN29dsDcg4i9hzpttjU9xt8Sc3IgdaQ+6NXStWd1AKrjNTCY52sOpIWh45uff/yjf9ynsbCo/UR8+hk6ZDCrM78YEyMj52miXzVQtSZ7f+bvWtz8iPppXXC+/zwGPAI9EPC+9uRHRRh4vzGwid+clMmh9FF/0Oe4n0G5dBZvwLPncwOMg0UxLVs63ZRdTCSku4oKReQieqNr7+hzBAKaS8NRpxMtx2XC5aR0wYMkYT9API/vYubeU0L3r4lplw==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>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</ds:X509Certificate></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>

// To verify this signature, we simply load and verify:
Dim verifier As New Chilkat.XmlDSig
success = verifier.LoadSignatureSb(sbXml)
If (success <> True) Then
    System.DebugLog(verifier.LastErrorText)
    Return
End If

Dim bVerified As Boolean
bVerified = verifier.VerifySignature(True)
If (bVerified <> True) Then
    System.DebugLog(verifier.LastErrorText)
    Return
End If

System.DebugLog("Signature verified!")