(PowerShell) Generate RSA SSH Key

Generates an RSA SSH key and saves to various public and private key file formats (OpenSSH and PuTTY).

Download: Chilkat .NET Assemblies

[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

$key = New-Object Chilkat.SshKey

#  numBits may range from 384 to 4096.  Typical values are
#  1024 or 2048.  (must be a multiple of 64)
#  A good choice for the exponent is 65537.  Chilkat recommends
#  always using this value.
$numBits = 2048
$exponent = 65537
$success = $key.GenerateRsaKey($numBits,$exponent)
if ($success -ne $true) {
    $("Bad params passed to RSA key generation method.")
    exit
}

#  Note: Generating a public/private key pair is CPU intensive
#  and may take a short amount of time (more than few seconds,
#  but less than a minute).

#  Export the RSA private key to OpenSSH, PuTTY, and XML and save.
$exportEncrypted = $false
$exportedKey = $key.ToOpenSshPrivateKey($exportEncrypted)
#  Chilkat provides a SaveText method for convenience...
$success = $key.SaveText($exportedKey,"privkey_openssh_unencrypted.pem")

#  Export with encryption to OpenSSH private key format:
$key.Password = "secret"
$exportEncrypted = $true
$exportedKey = $key.ToOpenSshPrivateKey($exportEncrypted)
$success = $key.SaveText($exportedKey,"privkey_openssh_encrypted.pem")

#  Export the RSA private key to unencrypted PuTTY format:
$exportEncrypted = $false
$exportedKey = $key.ToPuttyPrivateKey($exportEncrypted)
$success = $key.SaveText($exportedKey,"privkey_putty_unencrypted.ppk")

#  Export the RSA private key to encrypted PuTTY format:
$key.Password = "secret"
$exportEncrypted = $true
$exportedKey = $key.ToPuttyPrivateKey($exportEncrypted)
$success = $key.SaveText($exportedKey,"privkey_putty_encrypted.ppk")

#  Export private key to XML:
$exportedKey = $key.ToXml()
$success = $key.SaveText($exportedKey,"privkey.xml")

#  ----------------------------------------------------
#  Now for the public key....
#  ----------------------------------------------------

#  The Secure Shell (SSH) Public Key File Format
#  is documented in RFC 4716.
$exportedKey = $key.ToRfc4716PublicKey()
$success = $key.SaveText($exportedKey,"pubkey_rfc4716.pub")

#  OpenSSH has a separate public-key file format, which
#  is also supported by Chilkat SshKey:
$exportedKey = $key.ToOpenSshPublicKey()
$success = $key.SaveText($exportedKey,"pubkey_openSsh.pub")

$("Finished.")