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(PowerShell) Get a Certificate's Key SizeDemonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.)
Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll" # For this example, I have a certificate in raw base64 format (not PEM), # that looks like this: "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA==" $sbCertBase64 = New-Object Chilkat.StringBuilder $success = $sbCertBase64.LoadFile("qa_data/certs/base64Cert.txt","utf-8") $cert = New-Object Chilkat.Cert $success = $cert.LoadFromBase64($sbCertBase64.GetAsString()) if ($success -ne $true) { $($cert.LastErrorText) exit } # Get the public key. $pubKey = $cert.ExportPublicKey() if ($cert.LastMethodSuccess -ne $true) { $($cert.LastErrorText) exit } # In Chilkat version v9.5.0.67, the KeySize property was added. $numBits = $pubKey.KeySize $("Number of bits = " + $numBits) # If using an older version of Chilkat, the key size can be obtained like this: $xml = New-Object Chilkat.Xml $xml.LoadXml($pubKey.GetXml()) $binDat = New-Object Chilkat.BinData $binDat.AppendEncoded($xml.GetChildContent("Modulus"),"base64") $numBits = 8 * $binDat.NumBytes $("Number of bits = " + $numBits) |
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