Lua

Convert Java KeyStore to PKCS12 / PFX

See more Java KeyStore (JKS) Examples

Loads a Java keystore file and saves it as a PKCS12 / PFX. A Java keystore (JKS) can contain two types of entries: (1) trusted root certificates or (2) private keys + cert chains. Usually a JKS will contain all entries of one type or another (and thus a particular JKS serves one purpose or another; meaning that a JKS containing trusted roots is used as a source for verifying pre-trusted roots, and a JKS containing private keys (and cert chains) is used as a secure, encrypted store for private keys).

A PKCS12 / PFX typically contains one or more private keys, along with each private key's certificate chain. Therefore, it typically makes sense to only write the private key entries to a PKCS12 (and the associated certificate chains). If a JKS contains trusted root certificates, it makes more sense to conver it to a PEM file (such as the CA cert bundle in PEM format from mozilla.org).

Lua

local chilkat = require("chilkat")

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

local jks = chilkat.JavaKeyStore.new()

local jksPassword = "myJksPassword"

-- Load the Java keystore from a file.  The JKS file password is used
-- to verify the keyed digest that is found at the very end of the keystore.
-- It verifies that the keystore has not been modified.
local success = jks:load_file(jksPassword, "/someDir/keyStore.jks")
if not success then
    print(jks.last_error_text)
    return
end

-- To convert, we'll access the private key entries
-- from the JKS, add each to the PKCS12, and then save the PKCS12.
local pkcs12 = chilkat.Pfx.new()

local numPrivateKeys = jks.num_private_keys

local privKey
local certChain

-- For each private key entry, get the private key and
-- the associated certificate chain.
-- Each private key is password protected.  Usually it is the same
-- password as used for the keyed digest of the entire JKS.
-- However, this does not have to be.  The password is passed
-- here to handle the possibility of each private key requiring
-- a different password.
local i = 0
while i < numPrivateKeys do
    privKey = ERROR: Method not in Chilkat for Lua: JavaKeyStore.GetPrivateKey
jks:ERROR()
    print(jks:get_private_key_alias(i))
    certChain = ERROR: Method not in Chilkat for Lua: JavaKeyStore.GetCertChain
jks:ERROR()

    -- Add the private key and it's associated certificate chain to the PKCS12.
    success = pkcs12:add_private_key(privKey, certChain)
    if not success then
        print(pkcs12.last_error_text)

        return
    end

    i = i + 1
end

-- Save the PKCS12 / PFX to a file.
-- The password can be the same as the JKS password, or something new.
-- (With the PKCS12 format, there is a single password for the entire contents
-- of the file.  With the JKS format, there is flexibility in allowing each private key
-- to have it's own password.)
local pkcs12Password = "myNewPassword"
success = pkcs12:to_file(pkcs12Password, "/pkcs12_files/myPfx.p12")
if not success then
    print(pkcs12.last_error_text)
else
    print("Successfully saved to PKCS12 format.")
end