PowerShell

RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature. PowerShell

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

$success = $false

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

# Create an instance of a certificate store object, load a PFX file,
# locate the certificate we need, and use it for signing.
# (a PFX file may contain more than one certificate.)
$certStore = New-Object Chilkat.CertStore

# The 1st argument is the filename, the 2nd arg is the 
# PFX file's password:
$success = $certStore.LoadPfxFile("chilkat.pfx","test")
if ($success -eq $false) {
    $($certStore.LastErrorText)
    exit
}

# Find the certificate by the subject common name:
$jsonCN = New-Object Chilkat.JsonObject
$jsonCN.UpdateString("CN","cert common name")

$cert = New-Object Chilkat.Cert
$success = $certStore.FindCert($jsonCN,$cert)
if ($success -eq $false) {
    $($certStore.LastErrorText)
    exit
}

$privKey = New-Object Chilkat.PrivateKey
$success = $cert.GetPrivateKey($privKey)
if ($success -eq $false) {
    $($cert.LastErrorText)
    exit
}

$rsa = New-Object Chilkat.Rsa

$success = $rsa.UsePrivateKey($privKey)
if ($success -eq $false) {
    $($rsa.LastErrorText)
    exit
}

# Encode the signature as a hex string
$rsa.EncodingMode = "hex"

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

# Sign the string using the sha-1 hash algorithm.
# Other valid choices are "sha-256", "md2" and "md5".
$hexSig = $rsa.SignStringENC($strData,"sha-1")

$($hexSig)

$("Success!")