(PowerShell) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

See more RSA Examples

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

Chilkat .NET Downloads Chilkat .NET Assemblies

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.

$rsa = New-Object Chilkat.Rsa

# Load the .pfx/.p12
$pfx = New-Object Chilkat.Pfx
$success = $pfx.LoadPfxFile("qa_data/pfx/myKey.p12","myPassword")
if ($success -ne $true) {
    $($pfx.LastErrorText)
    exit
}

# Get the default private key.
$privKey = $pfx.GetPrivateKey(0)
if ($pfx.LastMethodSuccess -ne $true) {
    $($pfx.LastErrorText)
    exit
}

# Import the private key into the RSA component:
$success = $rsa.ImportPrivateKeyObj($privKey)
if ($success -ne $true) {
    $($rsa.LastErrorText)

    exit
}

# Get the signature in base64
$rsa.EncodingMode = "base64"

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

# Sign the string using the sha256 hash algorithm.
# Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
$base64Sig = $rsa.SignStringENC($strData,"sha256")

$($base64Sig)

$("Success!")