PowerShell Requires Chilkat v11.0.0+

RSA Sign with PKCS8 Encrypted Key

See more RSA Examples

Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature (and then verify it). PowerShell

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.

$privKey = New-Object Chilkat.PrivateKey

#  Load the private key from an RSA PEM file:
$success = $privKey.LoadAnyFormatFile("raul_privateKey.key","a0123456789")
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

$rsa = New-Object Chilkat.Rsa

#  Import the private key into the RSA component:
$success = $rsa.UsePrivateKey($privKey)
if ($success -eq $false) {
    $($rsa.LastErrorText)
    exit
}

#  This example will sign a string, and receive the signature
#  in a hex-encoded string.  Therefore, set the encoding mode
#  to "hex":
$rsa.EncodingMode = "hex"

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

#  Sign the string using the sha256 hash algorithm.
#  Other valid choices are sha1, sha384, sha512 and others.
$hexSig = $rsa.SignStringENC($strData,"sha256")
if ($rsa.LastMethodSuccess -eq $false) {
    $($rsa.LastErrorText)
    exit
}

$($hexSig)

#  Now verify with the public key.
#  This example shows how to use the public key from 
#  a digital certificate (.cer file)
$cert = New-Object Chilkat.Cert
$success = $cert.LoadFromFile("raul_publicKey.cer")
if ($success -eq $false) {
    $($cert.LastErrorText)
    exit
}

$pubKey = New-Object Chilkat.PublicKey
$cert.GetPublicKey($pubKey)

$rsa2 = New-Object Chilkat.Rsa
$success = $rsa2.UsePublicKey($pubKey)
if ($success -eq $false) {
    $($rsa2.LastErrorText)
    exit
}

#  Verify the signature against the original data:
$rsa2.EncodingMode = "hex"
$success = $rsa2.VerifyStringENC($strData,"sha256",$hexSig)
if ($success -eq $false) {
    $($rsa2.LastErrorText)
    exit
}

$("Signature verified!")

#  Verify with incorrect data:
$success = $rsa2.VerifyStringENC("something else","sha256",$hexSig)
if ($success -ne $true) {
    $("Signature not verified! (which was expected in this case)")
}
else {
    $("Hmmm... that's not right...")
}