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(Visual FoxPro) Create XML Signature with External Data ReferenceDemonstrates how to create an XML digital signature where the data is external. In this case, the data is a JPG file. This example requires Chilkat v9.5.0.69 or greater.
LOCAL lcUrl LOCAL loHttp LOCAL loSbXml LOCAL lnSuccess LOCAL loRsaKey LOCAL loXmlSigGen LOCAL lcJpgUrl LOCAL loJpgData * This example requires the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * This example inserts an XML signature in the following XML: * <?xml version="1.0" encoding="UTF-8" standalone="no"?> * <abc> * <xyz> * <jpg> * <name>starfish.jpg</name> * <url>https://www.chilkatsoft.com/images/starfish.jpg</url> * </jpg> * </xyz> * </abc> * The above XML is available at https://www.chilkatsoft.com/exampleData/addSignatureToThis.xml * First fetch the XML: lcUrl = "https://www.chilkatsoft.com/exampleData/addSignatureToThis.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') loSbXml = CreateObject('Chilkat.StringBuilder') lnSuccess = loHttp.QuickGetSb(lcUrl,loSbXml) IF (lnSuccess <> 1) THEN ? loHttp.LastErrorText RELEASE loHttp RELEASE loSbXml CANCEL ENDIF * We'll use an RSA private key for signing. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PrivateKey') loRsaKey = CreateObject('Chilkat.PrivateKey') lnSuccess = loRsaKey.LoadPemFile("qa_data/rsa/rsaPrivKey_pkcs8.pem") IF (lnSuccess <> 1) THEN ? loRsaKey.LastErrorText RELEASE loHttp RELEASE loSbXml RELEASE loRsaKey CANCEL ENDIF * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.XmlDSigGen') loXmlSigGen = CreateObject('Chilkat.XmlDSigGen') * Indicate were the Signature will be inserted: loXmlSigGen.SigLocation = "abc|xyz|jpg" * Provide the RSA key to be used for signing: loXmlSigGen.SetPrivateKey(loRsaKey) * Fetch the JPG image data. lcJpgUrl = "https://www.chilkatsoft.com/images/starfish.jpg" * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData') loJpgData = CreateObject('Chilkat.BinData') lnSuccess = loHttp.QuickGetBd(lcJpgUrl,loJpgData) IF (lnSuccess <> 1) THEN ? loHttp.LastErrorText RELEASE loHttp RELEASE loSbXml RELEASE loRsaKey RELEASE loXmlSigGen RELEASE loJpgData CANCEL ENDIF * Add the external data reference: loXmlSigGen.AddExternalBinaryRef(lcJpgUrl,loJpgData,"sha256","") * Create the XML digital signature: lnSuccess = loXmlSigGen.CreateXmlDSigSb(loSbXml) IF (lnSuccess <> 1) THEN ? loXmlSigGen.LastErrorText RELEASE loHttp RELEASE loSbXml RELEASE loRsaKey RELEASE loXmlSigGen RELEASE loJpgData CANCEL ENDIF * Examine the XML that now contains the Signature: ? loSbXml.GetAsString() * <?xml version="1.0" encoding="UTF-8" standalone="no"?> * <abc> * <xyz> * <jpg> * <name>starfish.jpg</name> * <url>https://www.chilkatsoft.com/images/starfish.jpg</url> * <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#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="https://www.chilkatsoft.com/images/starfish.jpg"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>AOU810yJV5Np/DnO29qpObqiTSTTCDvxGsX5ayiTYXI=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>ApHRr6nilNrzt3dLveC9zlPoSllaCMfHsbAwr+vYBPkHkJ4wD5LzDDhi1tSJZAAeTckmvSqIG3Wi0rgXQiSM644MD3coBFx4QgrY+GZ+XJJE2Y0Ye3VvaQBiRdUW3INGsW4GLubncgQk5JhuAQjo6O/GKpfEuYqUJj/6CLHLQwMPwbZ2043ykgzuPFoOZf6EydJMBAn1ORMvrpUn+zuA9UngOTGap6eWE4CeiNx23BRC2wSztbUjdCLcqXvgiYu/v0tBNaTcwy7b6+IFtwv/lNUUBUQJ/3p+aErzFn3wLeH3yeqpDCU0U6Dqu5SS1jYupcWWsLHJjYnj2066DPJi/g==</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></jpg> * </xyz> * </abc> * RELEASE loHttp RELEASE loSbXml RELEASE loRsaKey RELEASE loXmlSigGen RELEASE loJpgData |
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