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(C#) Verify XML Signature with External Data ReferenceDemonstrates how to verify 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.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The XML containing the Signature to be verified contains the following: // <?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>MbHOti6nOh9DJP/u7u1+a1u0wRYIGEdaAVk5ehxqeBhcR4qvGvCQ7wLxcfDuwFG2grSg43ANxDYngLqZTeFb5nCfywcuNBQI8FrNRVY5hkyv6kDW1BVN8ot9qPYX9oHxJp1e+nMszIiSxqHX3XDI7YnvFt/0CyeO5JaQQEzXzIwqqb8iUNcH/bJzR6CrTf1hGuQ5MPorG0bRwbYPPHHzipUqHBinK8VbHobnxL7GQHAhR8k9gDD35kZcMxf/74U7pGO19ZzTbdJW5S7q4bVVxvsuU3itTbhHI60pOE14ibrjZtIrPZLVUD3TQqIIF04TChW2NXdYOo3+ij4ZnP8x+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> // The above XML is available at https://www.chilkatsoft.com/exampleData/xmlsig_external_jpg_reference.xml // First fetch the XML.. string url = "https://www.chilkatsoft.com/exampleData/xmlsig_external_jpg_reference.xml"; Chilkat.Http http = new Chilkat.Http(); Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder(); bool success = http.QuickGetSb(url,sbXml); if (success != true) { Debug.WriteLine(http.LastErrorText); return; } Chilkat.XmlDSig verifier = new Chilkat.XmlDSig(); // Load the XML containing the signatures to be verified. // Note that this particular Signature already contains the RSA public key that will be used // for verification. success = verifier.LoadSignatureSb(sbXml); if (success != true) { Debug.WriteLine(verifier.LastErrorText); return; } // Get the Reference URI, which in this case is the URL to the binary data that was hashed. // This fetchs the URI attribute value from: <ds:Reference URI="https://www.chilkatsoft.com/images/starfish.jpg"> string refUri = verifier.ReferenceUri(0); if (verifier.LastMethodSuccess != true) { Debug.WriteLine("No reference URI found."); return; } // Download the JPG data to be verified. Chilkat.BinData jpgData = new Chilkat.BinData(); success = http.QuickGetBd(refUri,jpgData); if (success != true) { Debug.WriteLine(http.LastErrorText); return; } // Provide the JPG data to the verifier verifier.SetRefDataBd(0,jpgData); // Verify the signature bool bVerified = verifier.VerifySignature(true); Debug.WriteLine("Signature verified = " + Convert.ToString(bVerified)); |
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