Lua Requires Chilkat v11.0.0+

RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature. Lua

local chilkat = require("chilkat")

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

-- Create an instance of a certificate store object, load a PFX file,
-- locate the certificate we need, and use it for signing.
-- (a PFX file may contain more than one certificate.)
local certStore = chilkat.CertStore.new()

-- The 1st argument is the filename, the 2nd arg is the
-- PFX file's password:
local success = certStore:load_pfx_file("chilkat.pfx", "test")
if not success then
    print(certStore.last_error_text)
    return
end

-- Find the certificate by the subject common name:
local jsonCN = chilkat.JsonObject.new()
jsonCN:update_string("CN", "cert common name")

local cert = chilkat.Cert.new()
success = certStore:find_cert(jsonCN, cert)
if not success then
    print(certStore.last_error_text)
    return
end

local privKey = chilkat.PrivateKey.new()
success = cert:get_private_key(privKey)
if not success then
    print(cert.last_error_text)
    return
end

local rsa = chilkat.Rsa.new()

success = rsa:use_private_key(privKey)
if not success then
    print(rsa.last_error_text)
    return
end

-- Encode the signature as a hex string
rsa.encoding_mode = "hex"

local strData = "This is the string to be signed."

-- Sign the string using the sha-1 hash algorithm.
-- Other valid choices are "sha-256", "md2" and "md5".
local hexSig = rsa:sign_string_enc(strData, "sha-1")

print(hexSig)

print("Success!")