(DataFlex) Create Enveloping XML Digital Signature

This example creates an enveloping digital signature.
An enveloping signature is where the signed data is contained within the Signature within an Object element.
This example signs non-XML text data where the XML signature constitutes the entire output.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoHttp
File    Handle hoZipFile
    String sKeyUrl
    Boolean iSuccess
    Handle hoZip
    Variant vZipEntry
    Handle hoZipEntry
    Variant vEcKey
    Handle hoEcKey
    Handle hoGen
    Variant vSbContent
    Handle hoSbContent
    Variant vSbXml
    Handle hoSbXml
    String sTemp1

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Let's use the ECDSA private key at https://www.chilkatsoft.com/exampleData/secp256r1-key.zip
    // for signing.
    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End
    Get Create (RefClass(cComChilkatBinData)) To hoZipFile
    If (Not(IsComObjectCreated(hoZipFile))) Begin
        Send CreateComObject of hoZipFile
    End
    Move "https://www.chilkatsoft.com/exampleData/secp256r1-key.zip" To sKeyUrl

    Get pvComObject of hoZipFile to vZipFile
    Get ComQuickGetBd Of hoHttp sKeyUrl vZipFile To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatZip)) To hoZip
    If (Not(IsComObjectCreated(hoZip))) Begin
        Send CreateComObject of hoZip
    End
    Get pvComObject of hoZipFile to vZipFile
    Get ComOpenBd Of hoZip vZipFile To iSuccess
    Get ComFirstMatchingEntry Of hoZip "*.pem" To vZipEntry
    If (IsComObject(vZipEntry)) Begin
        Get Create (RefClass(cComChilkatZipEntry)) To hoZipEntry
        Set pvComObject Of hoZipEntry To vZipEntry
    End
    Get Create (RefClass(cComChilkatPrivateKey)) To hoEcKey
    If (Not(IsComObjectCreated(hoEcKey))) Begin
        Send CreateComObject of hoEcKey
    End
    Get ComUnzipToString Of hoZipEntry 0 "utf-8" To sTemp1
    Get ComLoadPem Of hoEcKey sTemp1 To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoEcKey To sTemp1
        Showln sTemp1
        Send Destroy of hoZipEntry
        Procedure_Return
    End

    Send Destroy of hoZipEntry

    // ----------------------------------------------------------------------------
    Get Create (RefClass(cComChilkatXmlDSigGen)) To hoGen
    If (Not(IsComObjectCreated(hoGen))) Begin
        Send CreateComObject of hoGen
    End

    // Provide the ECDSA key to the XML Digital Signature generator
    Get pvComObject of hoEcKey to vEcKey
    Get ComSetPrivateKey Of hoGen vEcKey To iSuccess

    // Add an enveloped reference to the content to be signed.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbContent
    If (Not(IsComObjectCreated(hoSbContent))) Begin
        Send CreateComObject of hoSbContent
    End
    Get ComAppend Of hoSbContent "This is the content that is signed." To iSuccess
    Get pvComObject of hoSbContent to vSbContent
    Get ComAddEnvelopedRef Of hoGen "abc123" vSbContent "sha256" "C14N" "" To iSuccess

    // Generate the XML digital signature.
    // Notice that in other examples, the sbXml passed to CreateXmlDSigSb
    // already contains XML, and the XML signature is inserted at the location
    // specified by the SigLocation property.  In this case, both SigLocation
    // and sbXml are empty.  The result is that sbXml will contain just the Signature.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbXml
    If (Not(IsComObjectCreated(hoSbXml))) Begin
        Send CreateComObject of hoSbXml
    End
    Get pvComObject of hoSbXml to vSbXml
    Get ComCreateXmlDSigSb Of hoGen vSbXml To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoGen To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Examine the enveloped signature, where the data is contained within the XML Signature
    Get ComGetAsString Of hoSbXml To sTemp1
    Showln sTemp1

    // The Signature returned is compact and in a single line, like this:
    // <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#ecdsa-sha256"/><ds:Reference URI="#abc123"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>tEVrbXXjeTXjF3tIojul4/sgeEGN49E1dxr/GMs8GNE=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>/pILUshwrzgdGc4bPgp85TDfbUiM9pn8EIPNRVWKuoVEtPsv4XRthUrv9aDDvajmyl2okLwTakANgtaxO1ULMw==</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:Object Id="abc123">This is the content that is signed.</ds:Object></ds:Signature>

    // XML pretty-printed, the signature is as follows, but pretty-printing introductes whitespace that breaks the signature..

    // <?xml version="1.0" encoding="utf-8" ?>
    // <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#ecdsa-sha256" />
    //         <ds:Reference URI="#abc123">
    //             <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" />
    //             <ds:DigestValue>tEVrbXXjeTXjF3tIojul4/sgeEGN49E1dxr/GMs8GNE=</ds:DigestValue>
    //         </ds:Reference>
    //     </ds:SignedInfo>
    //     <ds:SignatureValue>/pILUshwrzgdGc4bPgp85TDfbUiM9pn8EIPNRVWKuoVEtPsv4XRthUrv9aDDvajmyl2okLwTakANgtaxO1ULMw==</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:Object Id="abc123">This is the content that is signed.</ds:Object>
    // </ds:Signature>
    // 


End_Procedure