(PureBasic) Create Enveloping XML Signature with Multiple References

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

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkBinData.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkPrivateKey.pb"
IncludeFile "CkXmlDSigGen.pb"

Procedure ChilkatExample()

    ; 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.i = CkBinData::ckCreate()
    If jpgData.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = CkHttp::ckQuickGetBd(http,"https://www.chilkatsoft.com/images/starfish.jpg",jpgData)
    If success <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkBinData::ckDispose(jpgData)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    ; Get a small JSON document.
    sbJson.i = CkStringBuilder::ckCreate()
    If sbJson.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkHttp::ckQuickGetSb(http,"https://www.chilkatsoft.com/exampleData/sample.json",sbJson)
    If success <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkBinData::ckDispose(jpgData)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbJson)
        ProcedureReturn
    EndIf

    ; Get an RSA private key for signing.
    sbPem.i = CkStringBuilder::ckCreate()
    If sbPem.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkHttp::ckQuickGetSb(http,"https://www.chilkatdownload.com/example_data/rsaprivkey_secret.pem",sbPem)
    If success <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkBinData::ckDispose(jpgData)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbJson)
        CkStringBuilder::ckDispose(sbPem)
        ProcedureReturn
    EndIf

    rsaKey.i = CkPrivateKey::ckCreate()
    If rsaKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPrivateKey::ckLoadEncryptedPem(rsaKey,CkStringBuilder::ckGetAsString(sbPem),"secret")
    If success <> 1
        Debug CkPrivateKey::ckLastErrorText(rsaKey)
        CkBinData::ckDispose(jpgData)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbJson)
        CkStringBuilder::ckDispose(sbPem)
        CkPrivateKey::ckDispose(rsaKey)
        ProcedureReturn
    EndIf

    ; OK.. ready to begin building the signature.
    gen.i = CkXmlDSigGen::ckCreate()
    If gen.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Provide the RSA key to the XML Digital Signature generator
    CkXmlDSigGen::ckSetPrivateKey(gen,rsaKey)

    ; Add enveloped references to the content to be signed.
    sbContent.i = CkStringBuilder::ckCreate()
    If sbContent.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckAppend(sbContent,"The quick brown fox jumped over the lazy dog.")
    CkXmlDSigGen::ckAddEnvelopedRef(gen,"aaa",sbContent,"sha256","C14N","")

    CkXmlDSigGen::ckAddEnvelopedRef(gen,"bbb",sbJson,"sha256","C14N","")

    sbBase64.i = CkStringBuilder::ckCreate()
    If sbBase64.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Use "base64_mime" to encode the JPG data to base64 in multiple lines.
    CkBinData::ckGetEncodedSb(jpgData,"base64_mime",sbBase64)
    CkXmlDSigGen::ckAddEnvelopedRef(gen,"ccc",sbBase64,"sha256","C14N","")

    ; Generate the XML digital signature.
    sbXml.i = CkStringBuilder::ckCreate()
    If sbXml.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkXmlDSigGen::ckCreateXmlDSigSb(gen,sbXml)
    If success <> 1
        Debug CkXmlDSigGen::ckLastErrorText(gen)
        CkBinData::ckDispose(jpgData)
        CkHttp::ckDispose(http)
        CkStringBuilder::ckDispose(sbJson)
        CkStringBuilder::ckDispose(sbPem)
        CkPrivateKey::ckDispose(rsaKey)
        CkXmlDSigGen::ckDispose(gen)
        CkStringBuilder::ckDispose(sbContent)
        CkStringBuilder::ckDispose(sbBase64)
        CkStringBuilder::ckDispose(sbXml)
        ProcedureReturn
    EndIf

    ; Examine the enveloped signature, where the data for each reference is contained within the XML Signature
    Debug CkStringBuilder::ckGetAsString(sbXml)

    ; 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"
    ; }
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    ; AQBIAAAAAQABOEJJTQPzAAAAAAAIAAAAAAAAAAE4QklNBAoAAAAAAAEAADhCSU0nEAAAAAAACgAB
    ; AAAAAAAAAAI4QklNA/UAAAAAAEgAL2ZmAAEAbGZmAAYAAAAAAAEAL2ZmAAEAoZmaAAYAAAAAAAEA
    ; MgAAAAEAWgAAAAYAAAAAAAEANQAAAAEALQAAAAYAAAAAAAE4QklNBBQAAAAAAAQAAAABOEJJTQQM
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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>
    ; 
    ; 


    CkBinData::ckDispose(jpgData)
    CkHttp::ckDispose(http)
    CkStringBuilder::ckDispose(sbJson)
    CkStringBuilder::ckDispose(sbPem)
    CkPrivateKey::ckDispose(rsaKey)
    CkXmlDSigGen::ckDispose(gen)
    CkStringBuilder::ckDispose(sbContent)
    CkStringBuilder::ckDispose(sbBase64)
    CkStringBuilder::ckDispose(sbXml)


    ProcedureReturn
EndProcedure