(DataFlex) Create Enveloping XML Signature with Multiple References

Demonstrates how to create an enveloping XML digital signature containing multiple Object references.

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

Use ChilkatAx-win32.pkg

Procedure Test
    Variant vJpgData
    Handle hoJpgData
    Handle hoHttp
    Boolean iSuccess
    Variant vSbJson
    Handle hoSbJson
    Variant vSbPem
    Handle hoSbPem
    Variant vRsaKey
    Handle hoRsaKey
    Handle hoGen
    Variant vSbContent
    Handle hoSbContent
    Variant vSbBase64
    Handle hoSbBase64
    Variant vSbXml
    Handle hoSbXml
    String sTemp1

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

    // This example creates an XML signature that contains three Objects:
    // 
    // 1. A base64 encoded JPG image.
    // 2. Some plain text.
    // 3. Some JSON.
    // 

    // Get a small JPG image.
    Get Create (RefClass(cComChilkatBinData)) To hoJpgData
    If (Not(IsComObjectCreated(hoJpgData))) Begin
        Send CreateComObject of hoJpgData
    End
    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End
    Get pvComObject of hoJpgData to vJpgData
    Get ComQuickGetBd Of hoHttp "https://www.chilkatsoft.com/images/starfish.jpg" vJpgData To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get a small JSON document.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJson
    If (Not(IsComObjectCreated(hoSbJson))) Begin
        Send CreateComObject of hoSbJson
    End
    Get pvComObject of hoSbJson to vSbJson
    Get ComQuickGetSb Of hoHttp "https://www.chilkatsoft.com/exampleData/sample.json" vSbJson To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get an RSA private key for signing.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbPem
    If (Not(IsComObjectCreated(hoSbPem))) Begin
        Send CreateComObject of hoSbPem
    End
    Get pvComObject of hoSbPem to vSbPem
    Get ComQuickGetSb Of hoHttp "https://www.chilkatdownload.com/example_data/rsaprivkey_secret.pem" vSbPem To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatPrivateKey)) To hoRsaKey
    If (Not(IsComObjectCreated(hoRsaKey))) Begin
        Send CreateComObject of hoRsaKey
    End
    Get ComGetAsString Of hoSbPem To sTemp1
    Get ComLoadEncryptedPem Of hoRsaKey sTemp1 "secret" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRsaKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // OK.. ready to begin building the signature.
    Get Create (RefClass(cComChilkatXmlDSigGen)) To hoGen
    If (Not(IsComObjectCreated(hoGen))) Begin
        Send CreateComObject of hoGen
    End

    // Provide the RSA key to the XML Digital Signature generator
    Get pvComObject of hoRsaKey to vRsaKey
    Get ComSetPrivateKey Of hoGen vRsaKey To iSuccess

    // Add enveloped references 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 "The quick brown fox jumped over the lazy dog." To iSuccess
    Get pvComObject of hoSbContent to vSbContent
    Get ComAddEnvelopedRef Of hoGen "aaa" vSbContent "sha256" "C14N" "" To iSuccess

    Get pvComObject of hoSbJson to vSbJson
    Get ComAddEnvelopedRef Of hoGen "bbb" vSbJson "sha256" "C14N" "" To iSuccess

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbBase64
    If (Not(IsComObjectCreated(hoSbBase64))) Begin
        Send CreateComObject of hoSbBase64
    End
    // Use "base64_mime" to encode the JPG data to base64 in multiple lines.
    Get pvComObject of hoSbBase64 to vSbBase64
    Get ComGetEncodedSb Of hoJpgData "base64_mime" vSbBase64 To iSuccess
    Get pvComObject of hoSbBase64 to vSbBase64
    Get ComAddEnvelopedRef Of hoGen "ccc" vSbBase64 "sha256" "C14N" "" To iSuccess

    // Generate the XML digital 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 for each reference is contained within the XML Signature
    Get ComGetAsString Of hoSbXml To sTemp1
    Showln sTemp1

    // The exact XML signature looks like this:
    // (A pretty-printed XML signature is shown further below, but beware that the introduced whitespace breaks the signature.)

    // <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="#aaa"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>f0KK1a9yt2XMxCcr5Keziiv4BpAev/rRt/CGSJwS9i0=</ds:DigestValue></ds:Reference><ds:Reference URI="#bbb"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>buBASaqBjJXez8r/hFz4ZIIf+1mgf63AoI8MihViJtU=</ds:DigestValue></ds:Reference><ds:Reference URI="#ccc"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>+9PN/3Bz7xOuqi/wIBlGHEwPx+YUoILMsr2Iu0i1cCU=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>fI9l6/CKuwa7J2cczBzsKTOKec6cOVX/ehY2RcDZreGJlSo8bgv++nliFTwPyiZ8GT1Q2rDrA8biOt/ysZWnfim6AR79ld9CtLuKdqNsS/aSjwroDG/eWM0447zWoDSgAIsjXUAsF5xLschFW7+pGoPl5S1fVT/PUBkySlBi0I/U8P2UdiY8GoAL2rkHxTxDHaWh1GpBY28o9MSCuTgTiLVHF6WbmdHggqMc70OSTRh5vCMzZRTaAkTH6SWYt2WczKwmVea7hkM3BhpbA3EnpEIxK7TFl2GkFGXxAyXAxe2SVmXngt025LOFtU72fE+eChbqr5tejWl81z1g2F7ZnQ==</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:Object Id="aaa">The quick brown fox jumped over the lazy dog.</ds:Object><ds:Object Id="bbb">{
    //    "apple": "red",
    //    "lime": "green",
    //    "banana": "yellow",
    //    "broccoli": "green",
    //    "strawberry": "red"
    // }
    // </ds:Object><ds:Object Id="ccc">/9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA
    // AQBIAAAAAQABOEJJTQPzAAAAAAAIAAAAAAAAAAE4QklNBAoAAAAAAAEAADhCSU0nEAAAAAAACgAB
    // AAAAAAAAAAI4QklNA/UAAAAAAEgAL2ZmAAEAbGZmAAYAAAAAAAEAL2ZmAAEAoZmaAAYAAAAAAAEA
    // MgAAAAEAWgAAAAYAAAAAAAEANQAAAAEALQAAAAYAAAAAAAE4QklNBBQAAAAAAAQAAAABOEJJTQQM
    // AAAAAAyTAAAAAQAAAIAAAACAAAABgAAAwAAAAAx3ABgAAf/Y/+AAEEpGSUYAAQIBAEgASAAA//4A
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    // DAwMDAwMDAwMDAwMDAwMDAz/wAARCACAAIADASIAAhEBAxEB/90ABAAI/8QBPwAAAQUBAQEBAQEA
    // AAAAAAAAAwABAgQFBgcICQoLAQABBQEBAQEBAQAAAAAAAAABAAIDBAUGBwgJCgsQAAEEAQMCBAIF
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    // KG/x9+pgAdZjs0mkGDM2ZgoBQqVtPZ+pQL7zRNmzZ2W0FCqOxpYnX8NaSIAJMkftosMYcCNpJ2nc
    // 28VcycVrYzlRJAJVTvKnDv8A6dKMQLZCf6iC1QSLtp38n+3SO/EQJ6BTIonqNO6kBDqZ+nu0oEk7
    // bSNDrB2/E/jpvUeoCoGMwBuqBpwLP8PxHoPi4XWbmlTDCWmaAxl3zWExwKrEW7d+/Z4KW0ajaCWK
    // yRBlBb37P56YXlAV5cqoAtA3f323LnqFL8kEFpc7FjrNqe5bW6pyGQV00FpuXebzeFaXN6gajULQ
    // UbB0SE1ZFknqBmdaus1I6xB++sePFdzQPiHQANO7y7eKnfLnXG4UxeSCSusDxXUHVSVA2ChjgmOI
    // n/TxUpCcpBEE6t9OtBso5jDrbWoxoBHShdcraKv7aZ3N4BkxvTPft8VN6dLTrDEGT+pjDqOLz1La
    // 9Z9hrGCV013xuj32Ph81WubCwDRI0u3wODC7W8FC6CrtIgEDQeb3qCqIAHTbK5gKKAMczJsUkag3
    // WKt1cv0gbDkAZMzg9v5ZXuuv9slC4asdAokkezh/HRdse3UAnWmTJIOIm07GOumzeoMTvqbQqqdZ
    // 3p5jO2Ld4Fx46xZCAhVgCp0MHTZanepWHWOmULEY8IEkam5uGhhV2TI+nqJUl8ZU22RI3H4r1oW3
    // ZspOpYkgeZot73coZMouynUk1AGlH1WAQTx6ffWS3Eucxaqm7dYm1SIbxdykXIvLeTxgghjs5hea
    // xOPCJ6bsuO9Wa7YT1W+7u+apZWUE65H1eNkXUFVRd1n5WxuJDCKZwrQzAqykgrJjmLHEyrQyJ8R8
    // 5tW83ZNt7uMQZrMlqb7U2ObgDIP069PeANboA6JKj4iiVNOro3NZiOdLXmfyr7iqL+pTaQoAEDQf
    // f5fnr2W1+0aGrcQ+vo//2Q==</ds:Object>
    // </ds:Signature>
    // 
    // 


End_Procedure