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(Visual Basic 6.0) Get a Certificate's Key SizeDemonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.)
' For this example, I have a certificate in raw base64 format (not PEM), ' that looks like this: "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA==" Dim sbCertBase64 As New ChilkatStringBuilder Dim success As Long success = sbCertBase64.LoadFile("qa_data/certs/base64Cert.txt","utf-8") Dim cert As New ChilkatCert success = cert.LoadFromBase64(sbCertBase64.GetAsString()) If (success <> 1) Then Debug.Print cert.LastErrorText Exit Sub End If ' Get the public key. Dim pubKey As PublicKey Set pubKey = cert.ExportPublicKey() If (cert.LastMethodSuccess <> 1) Then Debug.Print cert.LastErrorText Exit Sub End If ' In Chilkat version v9.5.0.67, the KeySize property was added. Dim numBits As Long numBits = pubKey.KeySize Debug.Print "Number of bits = " & numBits ' If using an older version of Chilkat, the key size can be obtained like this: Dim xml As New ChilkatXml success = xml.LoadXml(pubKey.GetXml()) Dim binDat As New ChilkatBinData success = binDat.AppendEncoded(xml.GetChildContent("Modulus"),"base64") numBits = 8 * binDat.NumBytes Debug.Print "Number of bits = " & numBits |
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