A PowerShell script to make a 2048-bit RSA keypair. Saves the files in XML format in the user's document directory.

make-vc-keys.ps1

# Create a 2048-bit RSA Keypair in XML format
#
# @author Michael Johnson <michael.johnson@snap.md>
# @copyright 2016 SnapMD, Inc.
# @license https://opensource.org/licenses/BSD-2-Clause Simplified BSD License

<#
Copyright (c) 2016, SnapMD, Inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#>

$SavePath = "$env:USERPROFILE\Documents\VC-JWT-Keys"

If (Test-Path $SavePath) {
    Write-Error "It appears this has already been run. If you need to make a new keypair, delete or rename $SavePath" -Category ResourceExists
} Else {
    Write-Host "Creating a 2048-bit RSA Keypair"
    $rsa = New-Object System.Security.Cryptography.RSACryptoServiceProvider -ArgumentList 2048

    # Make a directory for the keys
    Write-Host "Creating directory $SavePath for storing keys"
    New-Item $SavePath -ItemType directory | Out-Null

    Write-Host "Saving private and public keys as private-key.xml and public-key.xml"

    #Private Key
    $rsa.toXmlString($true) | Out-File $SavePath\private-key.xml

    #Public Key
    $rsa.ToXmlString($false) | Out-File $SavePath\public-key.xml
}