(VB.NET) Create Enveloping XML Signature with Multiple References

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

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' 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.
Dim jpgData As New Chilkat.BinData
Dim http As New Chilkat.Http
Dim success As Boolean = http.QuickGetBd("https://www.chilkatsoft.com/images/starfish.jpg",jpgData)
If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Get a small JSON document.
Dim sbJson As New Chilkat.StringBuilder
success = http.QuickGetSb("https://www.chilkatsoft.com/exampleData/sample.json",sbJson)
If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Get an RSA private key for signing.
Dim sbPem As New Chilkat.StringBuilder
success = http.QuickGetSb("https://www.chilkatdownload.com/example_data/rsaprivkey_secret.pem",sbPem)
If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim rsaKey As New Chilkat.PrivateKey
success = rsaKey.LoadEncryptedPem(sbPem.GetAsString(),"secret")
If (success <> True) Then
    Debug.WriteLine(rsaKey.LastErrorText)
    Exit Sub
End If


' OK.. ready to begin building the signature.
Dim gen As New Chilkat.XmlDSigGen

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

' Add enveloped references to the content to be signed.
Dim sbContent As New Chilkat.StringBuilder
sbContent.Append("The quick brown fox jumped over the lazy dog.")
gen.AddEnvelopedRef("aaa",sbContent,"sha256","C14N","")

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

Dim sbBase64 As New Chilkat.StringBuilder
' 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.
Dim sbXml As New Chilkat.StringBuilder
success = gen.CreateXmlDSigSb(sbXml)
If (success <> True) Then
    Debug.WriteLine(gen.LastErrorText)
    Exit Sub
End If


' Examine the enveloped signature, where the data for each reference is contained within the XML Signature
Debug.WriteLine(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
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