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(DataFlex) Create XML Digital Signature using a DSA KeyDemonstrates how to create an XML digital signature using a DSA key. This example requires Chilkat v9.5.0.69 or greater.
Use ChilkatAx-9.5.0-win32.pkg Procedure Test String sUrl Handle hoHttp Variant vSbXml Handle hoSbXml Boolean iSuccess Variant vDsaKey Handle hoDsaKey Handle hoXmlSigGen Handle hoVerifier Boolean iBVerified String sTemp1 // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The XML to be signed in this example contains the following: // <?xml version="1.0" encoding="UTF-8" standalone="no"?> // <Envelope> // <Header> // <Security> // </Security> // </Header> // <Body Id="abc"> // <z:FooBar xmlns:z="https://www.example-code.com"/> // </Body> // </Envelope> // The above XML is available at https://www.chilkatsoft.com/exampleData/xmlToSign.xml // Fetch the XML and then sign it.. Move "https://www.chilkatsoft.com/exampleData/xmlToSign.xml" To sUrl Get Create (RefClass(cComChilkatHttp)) To hoHttp If (Not(IsComObjectCreated(hoHttp))) Begin Send CreateComObject of hoHttp End Get Create (RefClass(cComChilkatStringBuilder)) To hoSbXml If (Not(IsComObjectCreated(hoSbXml))) Begin Send CreateComObject of hoSbXml End Get pvComObject of hoSbXml to vSbXml Get ComQuickGetSb Of hoHttp sUrl vSbXml To iSuccess If (iSuccess <> True) Begin Get ComLastErrorText Of hoHttp To sTemp1 Showln sTemp1 Procedure_Return End // This example uses a DSA private key for signing. // There are many ways of getting an DSA private key using Chilkat. This example // will load it from an encrypted PEM file. // In case you would like to use it, I put the DSA private key PEM file here: // https://www.chilkatsoft.com/exampleData/dsa1024_secret.zip // The password is "secret". Get Create (RefClass(cComChilkatPrivateKey)) To hoDsaKey If (Not(IsComObjectCreated(hoDsaKey))) Begin Send CreateComObject of hoDsaKey End Get ComLoadEncryptedPemFile Of hoDsaKey "qa_data/dsa/dsa1024_secret.pem" "secret" To iSuccess If (iSuccess <> True) Begin Get ComLastErrorText Of hoDsaKey To sTemp1 Showln sTemp1 Procedure_Return End // To create the XML digital signature (i.e. embed the signature within // the XML), first specify what is desired, 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. // Get Create (RefClass(cComChilkatXmlDSigGen)) To hoXmlSigGen If (Not(IsComObjectCreated(hoXmlSigGen))) Begin Send CreateComObject of hoXmlSigGen End // In this example, we're going to put the signature within the Security element. // To specify the location, set the SigLocation property to the XML path to this element, // using vertical bar characters to separate tags. Set ComSigLocation Of hoXmlSigGen To "Envelope|Header|Security" // An XML digital signature contains one or more references. These can be 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 Body, which is indicated by providing the value of the "ID" attribute (where "ID" is case // insensitive). In this case, we specify "abc" because Body has an Id="abc". // This causes the <Body> ... </Body> XML fragment to be signed. // // 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 SHA1 and Exclusive XML Canonicalization. Get ComAddSameDocRef Of hoXmlSigGen "abc" "sha1" "EXCL_C14N" "" "" To iSuccess // Provide the DSA key to be used for signing: Get pvComObject of hoDsaKey to vDsaKey Get ComSetPrivateKey Of hoXmlSigGen vDsaKey To iSuccess // We're leaving the following properties at their default values: // // - SigNamespacePrefix (default is "ds") // - SignedInfoCanonAlg (default is EXCL_C14N) // - KeyInfoType (default is "KeyValue", where the DSA 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 hash/canonicalization algorithm. // They may or may not be the same. In this example, we use Exclusive XML Canonicalization and SHA1 throughout. // The default SignedInfoDigestMethod is sha256, which is a good choice. This example will // change it to sha1. Set ComSignedInfoDigestMethod Of hoXmlSigGen To "sha1" // OK, everything's specified, so let's create the XML digital signature: // This in-place signs the XML. If successful, sbXml will contain the // XML with the digital signature at the specified location. Get pvComObject of hoSbXml to vSbXml Get ComCreateXmlDSigSb Of hoXmlSigGen vSbXml To iSuccess If (iSuccess <> True) Begin Get ComLastErrorText Of hoXmlSigGen To sTemp1 Showln sTemp1 Procedure_Return End // Examine the signed XML: Get ComGetAsString Of hoSbXml To sTemp1 Showln sTemp1 // Below is the signed XML that is produced. // 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"?> // <Envelope> // <Header> // <Security> // <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/2000/09/xmldsig#dsa-sha1"/><ds:Reference URI="#abc"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><ds:DigestValue>77X3L6odxTBow1W1dIiqZW1foow=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>Ci/KiAqoQLvNyK94n8TJwdJ6dVpIIy8tJg+9s8utmB92cW8lTd+U7g==</ds:SignatureValue><ds:KeyInfo><ds:KeyValue><ds:DSAKeyValue><ds:P>AN+Af9FvnqYl84Own8m/MHza9vVFEbpySOiWyeIM8diDjaES9i+UykaX9BGc0oaRJHtrHhe+gboMBGHfP+gYcgbqzeyVCi2kHghRD/TK7uI4jN8Yv8tfM6AO0QrDFfxFq4IV+qTZbSoCkbWaopQ+kEOY6B4btFxJ1YuE48mExMZ3</ds:P><ds:Q>AOCv5pwf4kvMW37Yzt0iH6URKOlD</ds:Q><ds:G>FO3eoDcpuU9Z25OQGFtC+M2ifczcKyRkFwTauGR3mIw0wePPiu3Ocr7A81SA8GQ9x3hWO5jyP//jL3jxYy8fgBg2RXwiic3nwT2rZfu50g6tPUpz1stKz/+Mxjulo6XuaMSOWwjU021IxVMzxQ1/L8QiwiIrwxvfQOaMY8HJgvw=</ds:G><ds:Y>JJmZQvWtrZ+Nb2YV47SfGAave8uOIedGlmg+CseoqKZC2aFcWM6kR0giUwQx834dhxQScRhqzxFxQPk/x+5hyG8LQbXW+BELmT1BiyodobYUAet4rSIt4EU4KU0iYw1drpcWT1jqI07l5xNi28heYSfSF5Odv2qwXxVKDSEeEkM=</ds:Y></ds:DSAKeyValue></ds:KeyValue></ds:KeyInfo></ds:Signature></Security> // </Header> // <Body Id="abc"> // <z:FooBar xmlns:z="https://www.example-code.com"/> // </Body> // </Envelope> // The above signed XML contains the DSA public key in the DSAKeyValue fragment (within the ds:KeyInfo). // The signature can easily be verified like this: Get Create (RefClass(cComChilkatXmlDSig)) To hoVerifier If (Not(IsComObjectCreated(hoVerifier))) Begin Send CreateComObject of hoVerifier End // First load the XML containing the signature(s) to be verified. Get pvComObject of hoSbXml to vSbXml Get ComLoadSignatureSb Of hoVerifier vSbXml To iSuccess If (iSuccess <> True) Begin Get ComLastErrorText Of hoVerifier To sTemp1 Showln sTemp1 Procedure_Return End Get ComVerifySignature Of hoVerifier True To iBVerified If (iBVerified <> True) Begin Get ComLastErrorText Of hoVerifier To sTemp1 Showln sTemp1 End Showln "Signature verified = " iBVerified End_Procedure |
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