Lua

Generate DSA SSH Key

See more SSH Key Examples

Generates a DSA SSH key and saves to various public and private key file formats (OpenSSH and PuTTY). Lua

local chilkat = require("chilkat")

local key = chilkat.SshKey.new()

-- numBits should be a minimum of 1024 and
-- a multiple of 64.  Typical values are
-- 1024 or 2048.
local numBits = 2048
local success = key:generate_dsa_key(numBits)
if not success then
    print("Invalid numBits passed to DSA key generation method.")
    return
end

-- 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 DSA private key to OpenSSH, PuTTY, and XML and save.
local exportEncrypted = false
local exportedKey = key:to_open_ssh_private_key(exportEncrypted)
-- Chilkat provides a SaveText method for convenience...
success = key:save_text(exportedKey, "privkey_openssh_unencrypted.pem")

-- Export with encryption to OpenSSH private key format:
key.password = "secret"
exportEncrypted = true
exportedKey = key:to_open_ssh_private_key(exportEncrypted)
success = key:save_text(exportedKey, "privkey_openssh_encrypted.pem")

-- Export the DSA private key to unencrypted PuTTY format:
exportEncrypted = false
exportedKey = key:to_putty_private_key(exportEncrypted)
success = key:save_text(exportedKey, "privkey_putty_unencrypted.ppk")

-- Export the DSA private key to encrypted PuTTY format:
key.password = "secret"
exportEncrypted = true
exportedKey = key:to_putty_private_key(exportEncrypted)
success = key:save_text(exportedKey, "privkey_putty_encrypted.ppk")

-- Export private key to XML:
exportedKey = key:to_xml()
success = key:save_text(exportedKey, "privkey.xml")

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

-- The Secure Shell (SSH) Public Key File Format
-- is documented in RFC 4716.
exportedKey = key:to_rfc4716_public_key()
success = key:save_text(exportedKey, "pubkey_rfc4716.pub")

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

print("Finished.")