Lua

DSA Generate Key

See more DSA Examples

Generates a DSA public/private key pair and saves to PEM and DER file formats (both encrypted and non-encrypted).

An encrypted DSA PEM looks like this:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,9DAFD5C4CD62A5D0

QwDdp66sB0qKXQli7FbVcKL/eo3wu7kGRlV2sI8XbkNa1RTLiwnwTWDB0dqyWRQ8
...
Bx0HVfxKiNgCbL6BQEnYD+GOmMcckuj9Uhgloe/YuXCIDJBGhjUt/li3hvR/PXeC

V2xxNl1XKBE88njqi+UXt4vjGVNLpvXM
-----END DSA PRIVATE KEY-----

Lua

local chilkat = require("chilkat")

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

local dsa = chilkat.Dsa.new()

-- Call GenKey to generate a new DSA key.
-- The number of bits should be at least 1024 and a multiple
-- of 64.   Typical values are either 1024 or 2048.
-- DSA key generation is compute intensive and may take
-- a short while to complete.
local success = dsa:gen_key(2048)
if not success then
    print(dsa.last_error_text)
    return
end

-- Extract the private and public parts to PEM or DER format
-- and save to files...

-- First for the public key...
-- The public key never needs to be encrypted.

-- Save the public key in PEM format:
local pemStr = dsa:to_public_pem()
-- This example will not check the return value of SaveText...
success = dsa:save_text(pemStr, "dsa_pub.pem")

-- Save the public key in DER format:
success = dsa:to_public_der_file("dsa_pub.der")

local bPublicOnly = true
-- Save to XML
local xmlStr = dsa:to_xml(bPublicOnly)
success = dsa:save_text(xmlStr, "dsa_pub.xml")

-- ------------------------------------
-- Now for the private key....
-- ------------------------------------

-- Unencrypted PEM:
pemStr = dsa:to_pem()
success = dsa:save_text(pemStr, "dsa_priv.pem")

-- Encrypted PEM:
pemStr = dsa:to_encrypted_pem("myPassword")
success = dsa:save_text(pemStr, "dsa_privEncrypted.pem")

-- DER:
success = dsa:to_der_file("dsa_priv.der")

-- XML:
bPublicOnly = false
xmlStr = dsa:to_xml(bPublicOnly)
success = dsa:save_text(xmlStr, "dsa_priv.xml")

print("Finished!")