(Ruby) Convert PuTTY Private Key (ppk) to OpenSSH (pem)

Convert a PuTTY format private key file (.ppk) to OpenSSH (.pem).

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

key = Chilkat::CkSshKey.new()

# Load an unencrypted or encrypted PuTTY private key.

# If  your PuTTY private key is encrypted, set the Password
# property before calling FromPuttyPrivateKey.
# If your PuTTY private key is not encrypted, it makes no diffference
# if Password is set or not set.
key.put_Password("secret")

# First load the .ppk file into a string:

keyStr = key.loadText("putty_private_key.ppk")

# Import into the SSH key object:
success = key.FromPuttyPrivateKey(keyStr)
if (success != true)
    print key.lastErrorText() + "\n";
    exit
end

# Convert to an encrypted or unencrypted OpenSSH key.

# First demonstrate converting to an unencrypted OpenSSH key

bEncrypt = false
unencryptedKeyStr = key.toOpenSshPrivateKey(bEncrypt)
success = key.SaveText(unencryptedKeyStr,"unencrypted_openssh.pem")
if (success != true)
    print key.lastErrorText() + "\n";
    exit
end

# Save to an encrypted OpenSSH PEM file:

bEncrypt = true
key.put_Password("myPassword")
encryptedKeyStr = key.toOpenSshPrivateKey(bEncrypt)
success = key.SaveText(encryptedKeyStr,"encrypted_openssh.pem")
if (success != true)
    print key.lastErrorText() + "\n";
    exit
end

print "Done!" + "\n";