Lua

PKCS7 Sign Text using RSA 2048, SHA256, Base64 Output

See more Digital Signatures Examples

Demonstrates how to sign text using 2048-bit RSA with SHA256, producing PKCS#7 output in Base64. The certificate w/ private key used for signing is loaded from a .p12/.pfx file. Lua

local chilkat = require("chilkat")

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

local cert = chilkat.Cert.new()

-- Load the cert and private key.  Whatever the private key happens to be,
-- such as RSA or ECC, then Chilkat will use it.  If the private key is
-- a 2048-bit RSA key, then that's what will be used..
local success = cert:load_pfx_file("qa_data/pfx/myCertAndKey.p12", "password")
if not success then
    print(cert.last_error_text)
    return
end

local crypt = chilkat.Crypt2.new()

success = crypt:set_signing_cert(cert)
if not success then
    print(crypt.last_error_text)
    return
end

-- Use SHA-256
crypt.hash_algorithm = "sha256"

-- Hash the utf-8 byte representation of the string
crypt.charset = "utf-8"

-- Return the result in base64
crypt.encoding_mode = "base64"

-- Sign some text..
local textToSign = "This is the text to be hashed and signed."
local sigBase64 = crypt:opaque_sign_string_enc(textToSign)
if not crypt.last_method_success then
    print(crypt.last_error_text)
    return
end

print(sigBase64)

-- The result:
-- MIIS2wYJKoZIhvcNAQc ... zGeeY4Oxg==