(PowerShell) Generate RSA Key and Sign a String

See more RSA Examples

Note: This example requires Chilkat v11.0.0 or greater.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$rsa = New-Object Chilkat.Rsa

# Generate a 2048-bit RSA key.
$privKey = New-Object Chilkat.PrivateKey
$success = $rsa.GenKey(2048,$privKey)

$rsa.UsePrivateKey($privKey)

# Return the signature in hex.
$rsa.EncodingMode = "hex"

$strData = "This is the string to be signed."

# Sign the SHA256 hash of the string.
$hexSig = $rsa.SignStringENC($strData,"sha256")

$($hexSig)

# Now verify the signature:
$pubKey = New-Object Chilkat.PublicKey
$privKey.ToPublicKey($pubKey)
$rsa.UsePublicKey($pubKey)

$success = $rsa.VerifyStringENC($strData,"sha256",$hexSig)
if ($success -eq $true) {
    $("Signature verified!")
}
else {
    $($rsa.LastErrorText)
}

# Try it with an invalid signature:
$success = $rsa.VerifyStringENC($strData,"sha256","not a valid sig")
if ($success -eq $true) {
    $("Signature verified!")
}
else {
    $("Signature validation failed!")
}

# Try it with invalid data:
$success = $rsa.VerifyStringENC("Not the original data","sha256",$hexSig)
if ($success -eq $true) {
    $("Signature verified!")
}
else {
    $("Signature validation failed!")
}