(PowerShell) RSA Sign using Base64 Private Key

Signs a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 string.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$privKey = New-Object Chilkat.PrivateKey

$sbPem = New-Object Chilkat.StringBuilder
$sbPem.AppendLine("-----BEGIN RSA PRIVATE KEY-----",$true)
$sbPem.AppendLine("MIIC .... j5A==",$true)
$sbPem.AppendLine("-----END RSA PRIVATE KEY-----",$true)

$success = $privKey.LoadPem($sbPem.GetAsString())
if ($success -ne $true) {
    $($privKey.LastErrorText)
    exit
}

$rsa = New-Object Chilkat.Rsa

$success = $rsa.ImportPrivateKeyObj($privKey)
if ($success -ne $true) {
    $($rsa.LastErrorText)
    exit
}

$rsa.EncodingMode = "base64"
$strSigned = $rsa.OpenSslSignStringENC("12345678")
$($strSigned)

$strOriginal = $rsa.OpenSslVerifyStringENC($strSigned)
$($strOriginal)