Lua Requires Chilkat v11.0.0+

Create PKCS1 RSA Signature with PEM Private Key

See more RSA Examples

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature. Lua

local chilkat = require("chilkat")

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

local pkey = chilkat.PrivateKey.new()

-- Load the private key from an RSA PEM file:
local success = pkey:load_pem_file("pvkey2_rsa.pem")
if not success then
    print(pkey.last_error_text)
    return
end

local rsa = chilkat.Rsa.new()

-- Import the private key into the RSA object:
success = rsa:use_private_key(pkey)
if not success then
    print(rsa.last_error_text)
    return
end

-- Get the signature as hex.
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 "md2", "md5", "sha256",
-- "sha384", and "sha512".
local hexSig = rsa:sign_string_enc(strData, "sha-1")

print(hexSig)

print("Success!")