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Classic ASP Examples

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(Classic ASP) Create XML Signature with External Data Reference

Demonstrates how to create an XML digital signature where the data is external. In this case, the data is a JPG file.

This example requires Chilkat v9.5.0.69 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

'  This example inserts an XML signature in the following XML:

'  <?xml version="1.0" encoding="UTF-8" standalone="no"?>
'  <abc>
'    <xyz>
'      <jpg>
'          <name>starfish.jpg</name>
'          <url>https://www.chilkatsoft.com/images/starfish.jpg</url>
'      </jpg>
'    </xyz>
'  </abc>

'  The above XML is available at https://www.chilkatsoft.com/exampleData/addSignatureToThis.xml
'  First fetch the XML:

url = "https://www.chilkatsoft.com/exampleData/addSignatureToThis.xml"
set http = Server.CreateObject("Chilkat_9_5_0.Http")
set sbXml = Server.CreateObject("Chilkat_9_5_0.StringBuilder")
success = http.QuickGetSb(url,sbXml)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>"
    Response.End
End If

'  We'll use an RSA private key for signing.
set rsaKey = Server.CreateObject("Chilkat_9_5_0.PrivateKey")
success = rsaKey.LoadPemFile("qa_data/rsa/rsaPrivKey_pkcs8.pem")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( rsaKey.LastErrorText) & "</pre>"
    Response.End
End If

set xmlSigGen = Server.CreateObject("Chilkat_9_5_0.XmlDSigGen")

'  Indicate were the Signature will be inserted:
xmlSigGen.SigLocation = "abc|xyz|jpg"

'  Provide the RSA key to be used for signing:
success = xmlSigGen.SetPrivateKey(rsaKey)

'  Fetch the JPG image data.
jpgUrl = "https://www.chilkatsoft.com/images/starfish.jpg"
set jpgData = Server.CreateObject("Chilkat_9_5_0.BinData")
success = http.QuickGetBd(jpgUrl,jpgData)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>"
    Response.End
End If

'  Add the external data reference:
success = xmlSigGen.AddExternalBinaryRef(jpgUrl,jpgData,"sha256","")

'  Create the XML digital signature:
success = xmlSigGen.CreateXmlDSigSb(sbXml)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( xmlSigGen.LastErrorText) & "</pre>"
    Response.End
End If

'  Examine the XML that now contains the Signature:
Response.Write "<pre>" & Server.HTMLEncode( sbXml.GetAsString()) & "</pre>"

'  <?xml version="1.0" encoding="UTF-8" standalone="no"?>
'  <abc>
'    <xyz>
'      <jpg>
'          <name>starfish.jpg</name>
'          <url>https://www.chilkatsoft.com/images/starfish.jpg</url>
'      <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="https://www.chilkatsoft.com/images/starfish.jpg"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>AOU810yJV5Np/DnO29qpObqiTSTTCDvxGsX5ayiTYXI=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>ApHRr6nilNrzt3dLveC9zlPoSllaCMfHsbAwr+vYBPkHkJ4wD5LzDDhi1tSJZAAeTckmvSqIG3Wi0rgXQiSM644MD3coBFx4QgrY+GZ+XJJE2Y0Ye3VvaQBiRdUW3INGsW4GLubncgQk5JhuAQjo6O/GKpfEuYqUJj/6CLHLQwMPwbZ2043ykgzuPFoOZf6EydJMBAn1ORMvrpUn+zuA9UngOTGap6eWE4CeiNx23BRC2wSztbUjdCLcqXvgiYu/v0tBNaTcwy7b6+IFtwv/lNUUBUQJ/3p+aErzFn3wLeH3yeqpDCU0U6Dqu5SS1jYupcWWsLHJjYnj2066DPJi/g==</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:Signature></jpg>
'    </xyz>
'  </abc>
' 

%>
</body>
</html>

 

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