(Go) Create Enveloping XML Signature with Multiple References

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

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    // 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.
    jpgData := chilkat.NewBinData()
    http := chilkat.NewHttp()
    success := http.QuickGetBd("https://www.chilkatsoft.com/images/starfish.jpg",jpgData)
    if success != true {
        fmt.Println(http.LastErrorText())
        jpgData.DisposeBinData()
        http.DisposeHttp()
        return
    }

    // Get a small JSON document.
    sbJson := chilkat.NewStringBuilder()
    success = http.QuickGetSb("https://www.chilkatsoft.com/exampleData/sample.json",sbJson)
    if success != true {
        fmt.Println(http.LastErrorText())
        jpgData.DisposeBinData()
        http.DisposeHttp()
        sbJson.DisposeStringBuilder()
        return
    }

    // Get an RSA private key for signing.
    sbPem := chilkat.NewStringBuilder()
    success = http.QuickGetSb("https://www.chilkatdownload.com/example_data/rsaprivkey_secret.pem",sbPem)
    if success != true {
        fmt.Println(http.LastErrorText())
        jpgData.DisposeBinData()
        http.DisposeHttp()
        sbJson.DisposeStringBuilder()
        sbPem.DisposeStringBuilder()
        return
    }

    rsaKey := chilkat.NewPrivateKey()
    success = rsaKey.LoadEncryptedPem(*sbPem.GetAsString(),"secret")
    if success != true {
        fmt.Println(rsaKey.LastErrorText())
        jpgData.DisposeBinData()
        http.DisposeHttp()
        sbJson.DisposeStringBuilder()
        sbPem.DisposeStringBuilder()
        rsaKey.DisposePrivateKey()
        return
    }

    // OK.. ready to begin building the signature.
    gen := chilkat.NewXmlDSigGen()

    // Provide the RSA key to the XML Digital Signature generator
    gen.SetPrivateKey(rsaKey)

    // Add enveloped references to the content to be signed.
    sbContent := chilkat.NewStringBuilder()
    sbContent.Append("The quick brown fox jumped over the lazy dog.")
    gen.AddEnvelopedRef("aaa",sbContent,"sha256","C14N","")

    gen.AddEnvelopedRef("bbb",sbJson,"sha256","C14N","")

    sbBase64 := chilkat.NewStringBuilder()
    // Use "base64_mime" to encode the JPG data to base64 in multiple lines.
    jpgData.GetEncodedSb("base64_mime",sbBase64)
    gen.AddEnvelopedRef("ccc",sbBase64,"sha256","C14N","")

    // Generate the XML digital signature.
    sbXml := chilkat.NewStringBuilder()
    success = gen.CreateXmlDSigSb(sbXml)
    if success != true {
        fmt.Println(gen.LastErrorText())
        jpgData.DisposeBinData()
        http.DisposeHttp()
        sbJson.DisposeStringBuilder()
        sbPem.DisposeStringBuilder()
        rsaKey.DisposePrivateKey()
        gen.DisposeXmlDSigGen()
        sbContent.DisposeStringBuilder()
        sbBase64.DisposeStringBuilder()
        sbXml.DisposeStringBuilder()
        return
    }

    // Examine the enveloped signature, where the data for each reference is contained within the XML Signature
    fmt.Println(*sbXml.GetAsString())

    // 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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    // xOPCJ6bsuO9Wa7YT1W+7u+apZWUE65H1eNkXUFVRd1n5WxuJDCKZwrQzAqykgrJjmLHEyrQyJ8R8
    // 5tW83ZNt7uMQZrMlqb7U2ObgDIP069PeANboA6JKj4iiVNOro3NZiOdLXmfyr7iqL+pTaQoAEDQf
    // f5fnr2W1+0aGrcQ+vo//2Q==</ds:Object>
    // </ds:Signature>
    // 
    // 

    jpgData.DisposeBinData()
    http.DisposeHttp()
    sbJson.DisposeStringBuilder()
    sbPem.DisposeStringBuilder()
    rsaKey.DisposePrivateKey()
    gen.DisposeXmlDSigGen()
    sbContent.DisposeStringBuilder()
    sbBase64.DisposeStringBuilder()
    sbXml.DisposeStringBuilder()