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(PowerShell) Verify the RSA Signature of a SHA256 HashSee more RSA ExamplesDemonstrates how to verify an RSA signature of a SHA256 hash.
Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll" # This example assumes the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. # Let's say you have a file containing the 32-bytes of a SHA256 hash, # and a file that is an RSA signature of those 32 bytes. # Here's how you verify using the RSA public key found in a PEM. $pubKey = New-Object Chilkat.PublicKey $success = $pubKey.LoadFromFile("rsaPubKey.pem") if ($success -eq $false) { $($pubKey.LastErrorText) exit } $rsa = New-Object Chilkat.Rsa # Get the public key. $success = $rsa.ImportPublicKeyObj($pubKey) if ($success -eq $false) { $($rsa.LastErrorText) exit } # Get the 32-byte SHA256 hash. $bdHash = New-Object Chilkat.BinData $success = $bdHash.LoadFile("myHash.sha256") if ($success -eq $false) { $("Failed to load SHA256 hash.") exit } # Get the RSA signature to be validated. $bdSig = New-Object Chilkat.BinData $success = $bdSig.LoadFile("mySig.sig") if ($success -eq $false) { $("Failed to load RSA signature.") exit } # Verify the signature against the SHA256 hash. $enc = "base64" $rsa.EncodingMode = $enc $success = $rsa.VerifyHashENC($bdHash.GetEncoded($enc),"sha256",$bdSig.GetEncoded($enc)) if ($success -eq $false) { $($rsa.LastErrorText) exit } $("Signature validated.") |
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