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(Classic ASP) Get a Certificate's Key SizeDemonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.)
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <% ' For this example, I have a certificate in raw base64 format (not PEM), ' that looks like this: "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA==" ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder") set sbCertBase64 = Server.CreateObject("Chilkat.StringBuilder") success = sbCertBase64.LoadFile("qa_data/certs/base64Cert.txt","utf-8") ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Cert") set cert = Server.CreateObject("Chilkat.Cert") success = cert.LoadFromBase64(sbCertBase64.GetAsString()) If (success <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>" Response.End End If ' Get the public key. ' pubKey is a Chilkat.PublicKey Set pubKey = cert.ExportPublicKey() If (cert.LastMethodSuccess <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>" Response.End End If ' In Chilkat version v9.5.0.67, the KeySize property was added. numBits = pubKey.KeySize Response.Write "<pre>" & Server.HTMLEncode( "Number of bits = " & numBits) & "</pre>" ' If using an older version of Chilkat, the key size can be obtained like this: ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Xml") set xml = Server.CreateObject("Chilkat.Xml") success = xml.LoadXml(pubKey.GetXml()) ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData") set binDat = Server.CreateObject("Chilkat.BinData") success = binDat.AppendEncoded(xml.GetChildContent("Modulus"),"base64") numBits = 8 * binDat.NumBytes Response.Write "<pre>" & Server.HTMLEncode( "Number of bits = " & numBits) & "</pre>" %> </body> </html> |
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