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(Visual FoxPro) 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.
LOCAL lcUrl LOCAL loHttp LOCAL loSbSoapXml LOCAL lnSuccess LOCAL loEcKey LOCAL loXmlSigGen LOCAL loVerifier LOCAL lnBVerified * 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.. lcUrl = "https://www.chilkatsoft.com/exampleData/soapToSign.xml" * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http') loHttp = CreateObject('Chilkat.Http') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbSoapXml = CreateObject('Chilkat.StringBuilder') lnSuccess = loHttp.QuickGetSb(lcUrl,loSbSoapXml) IF (lnSuccess <> 1) THEN ? loHttp.LastErrorText RELEASE loHttp RELEASE loSbSoapXml CANCEL ENDIF * 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') loEcKey = CreateObject('Chilkat.PrivateKey') lnSuccess = loEcKey.LoadPemFile("qa_data/ecc/secp256r1-key.pem") IF (lnSuccess <> 1) THEN ? loEcKey.LastErrorText RELEASE loHttp RELEASE loSbSoapXml RELEASE loEcKey CANCEL ENDIF * 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') loXmlSigGen = 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. loXmlSigGen.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. loXmlSigGen.AddSameDocRef("Body","sha256","EXCL_C14N","","") * Let's provide the ECDSA key to be used for signing: loXmlSigGen.SetPrivateKey(loEcKey) * 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. loXmlSigGen.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. lnSuccess = loXmlSigGen.CreateXmlDSigSb(loSbSoapXml) IF (lnSuccess <> 1) THEN ? loXmlSigGen.LastErrorText RELEASE loHttp RELEASE loSbSoapXml RELEASE loEcKey RELEASE loXmlSigGen CANCEL ENDIF * Examine the signed SOAP XML: ? loSbSoapXml.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#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') loVerifier = CreateObject('Chilkat.XmlDSig') * First load the XML containing the signature(s) to be verified. lnSuccess = loVerifier.LoadSignatureSb(loSbSoapXml) IF (lnSuccess <> 1) THEN ? loVerifier.LastErrorText RELEASE loHttp RELEASE loSbSoapXml RELEASE loEcKey RELEASE loXmlSigGen RELEASE loVerifier CANCEL ENDIF lnBVerified = loVerifier.VerifySignature(1) IF (lnBVerified <> 1) THEN ? loVerifier.LastErrorText ENDIF ? "Signature verified = " + STR(lnBVerified) RELEASE loHttp RELEASE loSbSoapXml RELEASE loEcKey RELEASE loXmlSigGen RELEASE loVerifier |
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