Lua Requires Chilkat v11.0.0+

Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

See more RSA Examples

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

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("myKey.pem")

local rsa = chilkat.Rsa.new()

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

-- OpenSSL uses BigEndian byte ordering:
rsa.little_endian = false

-- The resulting signature will be a Base64 string:
rsa.encoding_mode = "base64"

-- For simplicity, we're not loading
-- the data to be signed from a file.  We are instead simply
-- using a literal string value.
local strData = "This is the text to be signed."

-- Hash the input using MD5, and then sign the hash:
-- Other valid hash algorithm choices are "md2" and "sha-1".
local base64Sig = rsa:sign_string_enc(strData, "md5")

print(base64Sig)

print("Success!")