(PowerShell) Encrypt with Chilkat, Decrypt with OpenSSL

Demonstrates how to RSA encrypt a string using Chilkat, and then shows the corresponding OpenSSL command to RSA decrypt. The OpenSSL command to decrypt is as follows:

openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

Chilkat .NET Downloads Chilkat .NET Assemblies

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

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

$rsa = New-Object Chilkat.Rsa

# Note: RSA encryption uses the public key.  
# RSA decryption uses the private key.
# The reason is that the public key can be freely provided to anybody.  This allows anybody
# to send an encrypted message to the private key owner, and only the private key owner 
# can decrypt.
$key = New-Object Chilkat.PublicKey

# Load an RSA public key from a PEM file:
$success = $key.LoadFromFile("qa_data/pem/VP_Public.pem")
if ($success -ne $true) {
    $($key.LastErrorText)
    exit
}

# Load the public key into the RSA object.
$success = $rsa.ImportPublicKeyObj($key)
if ($success -ne $true) {
    $($rsa.LastErrorText)
    exit
}

$strToEncrypt = "00000000;XYZ2-3BHQ-ABCD-MMVV;6MY1-GHJK-9LRR;0"

# The LittleEndian property is $false by default, but it is set here
# anyway to show that LittleEndian byte ordering is required for OpenSSL compatibility.
$rsa.LittleEndian = $false

$usePrivateKey = $false

$encryptedBytes = $rsa.EncryptString($strToEncrypt,$usePrivateKey)
if ($rsa.LastMethodSuccess -ne $true) {
    $($rsa.LastErrorText)
    exit
}

# The OpenSSL command to decrypt would be this:
# openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

$fac = New-Object Chilkat.FileAccess
$success = $fac.WriteEntireFile("qa_output/rsa_encrypted.bin",$encryptedBytes)
if ($success -ne $true) {
    $($fac.LastErrorText)
    exit
}

$("RSA Encryption Succeeded.")