B4X Requires Chilkat v11.0.0+
B4X
Create XML Signature with Certificate's Private Key
See more XML Digital Signatures Examples
Demonstrates how to create an XML digital signature using a certificate's RSA private key. This example loads the certificate from a PFX, and uses the cert's associated private key to sign. The public key is embedded in the XML signature as a ds:KeyInfo / ds:KeyValue / dsRSAKeyValue element.Chilkat B4X Downloads
Dim success As Boolean = False
' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.
' The SOAP XML to be signed in this example 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"></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>
'
' The above XML is available at https://www.chilkatsoft.com/exampleData/soapToSign.xml
' Fetch the XML and then sign it..
Dim url As String = "https://www.chilkatsoft.com/exampleData/soapToSign.xml"
Dim http As ChilkatHttp
http.Initialize("http")
Dim sbSoapXml As ChilkatStringBuilder
sbSoapXml.Initialize
success = http.QuickGetSb(url, sbSoapXml)
If success = False Then
Log(http.LastErrorText)
Return
End If
' Load a PFX file containing the certificate + private key.
Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadPfxFile("/somedir/myPfx.pfx", "pfx_password")
If success = False Then
Log(cert.LastErrorText)
Return
End If
' Get the RSA private key for signing...
Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = cert.GetPrivateKey(privKey)
If success = False Then
Log(cert.LastErrorText)
Return
End If
' To create the XML digital signature (i.e. embed the signature within
' the SOAP XML), we specify what is desired, and then call the method to
' create the XML signature.
'
' For example, the application must provide the following:
' - Where to put the signature.
' - What to sign.
' - The algorithms to be used.
' - The key to be used for signing.
'
Dim xmlSigGen As ChilkatXmlDSigGen
xmlSigGen.Initialize("xmlSigGen")
' In this example, we're going to put the signature within the wsse:Security element.
' To specify the location, set the SigLocation property to the XML path to this element,
' using vertical bar characters to separate tags.
xmlSigGen.SigLocation = "SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security"
' An XML digital signature contains one or more references. These are references to the parts
' of the XML document to be signed (a same document reference), or can be external references.
' This example will add a single same-document reference. We'll add a reference to the XML fragment
' at SOAP-ENV:Body, which is indicated by providing the value of the "ID" attribute (where "ID" is case
' insensitive). For each same-document reference, we must also indicate the hash algorithm and XML canonicalization
' algorithm to be used. For this example we'll choose SHA-256 and Exclusive XML Canonicalization.
xmlSigGen.AddSameDocRef("Body", "sha256", "EXCL_C14N", "", "")
' Let's provide the RSA key to be used for signing:
xmlSigGen.SetPrivateKey(privKey)
' We're leaving the following properties at their default values:
'
' - SigNamespacePrefix (default is "ds")
' - SigningAlg (for RSA keys. The default is PKCS1-v1_5, can be changed to RSASSA-PSS.)
' - SignedInfoCanonAlg (default is EXCL_C14N)
' - SignedInfoDigestMethod (default is sha256)
' - KeyInfoType (default is "KeyValue", where the RSA public key is included in the Signature)
' Note: Each Reference has it's own specified algorithms for XML canonicalization and hashing,
' and the actual signature part (the SignedInfo) has it's own algorithms for the same.
' They may or may not be the same. In this example, we use Exclusive XML Canonicalization and SHA-256 throughout.
' Finally, we're going to set one property that's optional, but commonly used.
' It's the SignedInfoPrefixList. In this case, we're using Exclusive Canonicalization, and the signature
' will be placed in a location within the XML document where namespace prefixes are used in the ancestors.
' Specifically, the "wsse" and "SOAP-ENV" namespace prefixes are used.
xmlSigGen.SignedInfoPrefixList = "wsse SOAP-ENV"
' OK, everything's specified, so let's create the XML digital signature:
' This in-place signs the XML. If successful, sbSoapXml will contain the
' XML with the digital signature at the specified location.
success = xmlSigGen.CreateXmlDSigSb(sbSoapXml)
If success = False Then
Log(xmlSigGen.LastErrorText)
Return
End If
' Examine the signed SOAP XML:
Log(sbSoapXml.GetAsString)
' This is the signed SOAP XML.
' Chilkat emits the Signature in compact form on a single line. Whitespace in XML signatures
' matters. Chilkat's opinion is that writing the Signature without whitespace minimizes the chance
' for problems with whatever software might be verifying the signature.
' <?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/2001/04/xmlenc#sha256"/><ds:DigestValue>OwgHPZNfDkXnZsjpfzXqAcT3RV3HzmTsEy2bP44FJ0M=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>C+7FWngUpJ33Q1yq8uuscjCyPN2IO4cJhpMv03Jrrht1V+4gvJQLIBk6HHjo1uPQyfYj6zji3pg+fOyGUptp17CsRvjCzSpP35vB2lEzHeS8dcY8XfrEtTP/0FNn75LmhhkOPy0wjWkgDVbgzhXpEk9az8r8fQVTM3vrcmXT+WdMWJXKBRFt6PLAhsFt0scOFTWAkLGyCwygzimDKX2nT63TOit9BigtIx7fPRuMkbybMKCGGABq2DiEbvrPOiN3SUYpyMNR9KehRAGN+OWnESaDC6DhOvbKR88XHkM+GeaRe9PWdrRHrwGfp3qgolKjR/wFRSa1YGSBKAhDJFBcdg==</ds:SignatureValue><ds:KeyInfo><ds:KeyValue><ds:RSAKeyValue><ds:Modulus>sXeRhM55P13FbpNcXAMR3olbw2Wa6keZIHu5YTZYUBTlYWId+pNiwUz3zFIEo+0IfYR0H27ybIycQO+1IIzJofUFNMAL3tZps2OKPlsjuCPls6kXpXhv/gvhux8LrCtp4PcKWqJ6QVOZKChc7WAx40qFWzHi57ueqRTv3x0kESqGg/VjsqyTEvb55psJO2RsfhLT7+YVh3hImRM3RDaJdkTkPuOxeFyT6N7VXD09329sLuS3QkUbE9zEKDnz9X3d8dEQdJhSI9ba5fxl8R7fu8pB67ElfzFml96X1jLFtzy1pzOT5Fc4ROcaqlYckVzdBq9sxezm6MYmDBjNAcibRw==</ds:Modulus><ds:Exponent>AQAB</ds:Exponent></ds:RSAKeyValue></ds:KeyValue></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>
' Here's the signature part formatted for easier reading.
' (Adding whitespace to the SignedInfo breaks the signature, so you wouldn't want to do this..)
' <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/2001/04/xmlenc#sha256" />
' <ds:DigestValue>OwgHPZNfDkXnZsjpfzXqAcT3RV3HzmTsEy2bP44FJ0M=</ds:DigestValue>
' </ds:Reference>
' </ds:SignedInfo>
' <ds:SignatureValue>C+7FWngUp....BKAhDJFBcdg==</ds:SignatureValue>
' <ds:KeyInfo>
' <ds:KeyValue>
' <ds:RSAKeyValue>
' <ds:Modulus>sXeRhM55P13FbpNcXAMR....MYmDBjNAcibRw==</ds:Modulus>
' <ds:Exponent>AQAB</ds:Exponent>
' </ds:RSAKeyValue>
' </ds:KeyValue>
' </ds:KeyInfo>
' </ds:Signature>