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(Classic ASP) Create XML Digital Signature using a ECDSA KeyDemonstrates how to create an XML digital signature using a ECDSA key. This example requires Chilkat v9.5.0.69 or greater.
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <% ' 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.. url = "https://www.chilkatsoft.com/exampleData/soapToSign.xml" ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Http") set http = Server.CreateObject("Chilkat.Http") ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder") set sbSoapXml = Server.CreateObject("Chilkat.StringBuilder") success = http.QuickGetSb(url,sbSoapXml) If (success <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>" Response.End End If ' This example uses an ECDSA private key for signing. ' There are many ways to load an ECDSA private key using Chilkat. This example ' will load from an unencrypted PEM file. ' For your convenience, Chilkat put this sample ECDSA PEM here: https://www.chilkatsoft.com/exampleData/secp256r1-key.zip ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.PrivateKey") set ecKey = Server.CreateObject("Chilkat.PrivateKey") success = ecKey.LoadPemFile("qa_data/ecc/secp256r1-key.pem") If (success <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( ecKey.LastErrorText) & "</pre>" Response.End 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. ' ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.XmlDSigGen") set xmlSigGen = Server.CreateObject("Chilkat.XmlDSigGen") ' In this example, the Signature will be placed 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. A given reference ' can be a same-document reference (to an XML fragment), or an external reference. ' 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. success = xmlSigGen.AddSameDocRef("Body","sha256","EXCL_C14N","","") ' Let's provide the ECDSA key to be used for signing: success = xmlSigGen.SetPrivateKey(ecKey) ' We're leaving the following properties at their default values: ' ' - SigNamespacePrefix (default is "ds") ' - SignedInfoCanonAlg (default is EXCL_C14N) ' - SignedInfoDigestMethod (default is sha256) ' - KeyInfoType (default is "KeyValue", where the ECDSA public key is included in the Signature) ' Note: Each Reference specifies its own algorithms for XML canonicalization and hashing. ' The SignedInfo part also has specified hash and canonicalization algorithms, which may be different ' than the algorithms used in the References. ' 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 <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( xmlSigGen.LastErrorText) & "</pre>" Response.End End If ' Examine the signed SOAP XML: Response.Write "<pre>" & Server.HTMLEncode( sbSoapXml.GetAsString()) & "</pre>" ' 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#ecdsa-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>jmPSGgtirHSjjcs/o0NIDwwvy4aFBCEosSN+XP5NLVuGpRYnS2EM7mItiw6TKmESAoJYV23ZN4pZ9BFRKSvZqw==</ds:SignatureValue><ds:KeyInfo><ds:KeyValue><ds:ECKeyValue xmlns="http://www.w3.org/2009/xmldsig11#"><ds:NamedCurve URI="urn:oid:1.2.840.10045.3.1.7" /><ds:PublicKey>BOVKaiLPKEDChhkA64UEBOXTv/VFHnhrUPN+bXqCvEl7rroAYpH5tKzbiGTtMSlp4JO9Pxg44zeX7EoWDvOrpD0=</ds:PublicKey></ds:ECKeyValue></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> ' The above signed XML contains the ECDSA public key in the ECKeyValue fragment (within the ds:KeyInfo). ' The signature can easily be verified like this: ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.XmlDSig") set verifier = Server.CreateObject("Chilkat.XmlDSig") ' First load the XML containing the signature(s) to be verified. success = verifier.LoadSignatureSb(sbSoapXml) If (success <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( verifier.LastErrorText) & "</pre>" Response.End End If bVerified = verifier.VerifySignature(1) If (bVerified <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( verifier.LastErrorText) & "</pre>" End If Response.Write "<pre>" & Server.HTMLEncode( "Signature verified = " & bVerified) & "</pre>" %> </body> </html> |
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