Lua Requires Chilkat v11.0.0+

Generate RSA Key and Export to PKCS1 / PKCS8

See more RSA Examples

_LANGUAGE_ example code showing how to generate an RSA public/private key and save to PKCS1 and PKCS8 format files. In a PKCS1 or PKCS8 formatted file, the key is stored in binary ASN.1 format (and ASN.1 is itself written according to DER -- Distinguished Encoding Rules). A PEM file simply contains the binary ASN.1 base64 encoded and delimited by BEGIN/END lines. PKCS1 format files are never encrypted. PKCS8 can be encrypted or unencrypted. Public keys are never encrypted (there is no need). Private keys *should* always be encrypted - unless perhaps the unencrypted private key is obtained and itself stored in some sort of secure place. Lua

local chilkat = require("chilkat")

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

local rsa = chilkat.Rsa.new()

-- Generate a 2048-bit key.  Chilkat RSA supports
-- key sizes ranging from 512 bits to 8192 bits.
local privKey = chilkat.PrivateKey.new()
local success = rsa:gen_key(2048, privKey)
if not success then
    print(rsa.last_error_text)
    return
end

-- Get the public key
local pubKey = chilkat.PublicKey.new()
privKey:to_public_key(pubKey)

-- Get the public key as a PKCS8 PEM string
local pubKeyPem = pubKey:get_pem(false)
print(pubKeyPem)

-- Get the public key in PKCS8 format, in a Base64 encoded string.
local pubKeyPkcs8Base64 = pubKey:get_encoded(false, "base64")
print(pubKeyPkcs8Base64)

-- Get the public key in PKCS1 format, in a Base64 encoded string.
local pubKeyPkcs1Base64 = pubKey:get_encoded(true, "base64")
print(pubKeyPkcs1Base64)

-- Get the private key in a PKCS8 PEM string.
local privKeyPem = privKey:get_pkcs8_pem()
print(privKeyPem)

-- Get the private key in a PKCS8 encrypted PEM string.
local privKeyEncPem = privKey:get_pkcs8_encrypted_pem("myPassword")
print(privKeyEncPem)

-- Get the private key in PKCS1 Base64 format
local privKeyPkcs1Base64 = privKey:get_pkcs1_enc("base64")
print(privKeyPkcs1Base64)

-- Get the private key in PKCS8 Base64 format
local privKeyPkcs8Base64 = privKey:get_pkcs8_enc("base64")
print(privKeyPkcs8Base64)

-- Save to PKCS1 / PKCS8 / PEM files...

-- Save the public key to PKCS8 binary DER
success = pubKey:save_der_file(false, "pubKey_pkcs8.der")

-- Save the public key to PKCS1 binary DER
success = pubKey:save_der_file(true, "pubKey_pkcs1.der")

-- Save the private key to unencrypted binary PKCS1 DER.
-- Note: PKCS1 is never found in an encrypted format.
success = privKey:save_pkcs1_file("privKey_pkcs1.der")

-- Save the private key to unencrypted binary PKCS8
success = privKey:save_pkcs8_file("privKey_pkcs8.der")

-- Save the private key to encrypted binary PKCS8
success = privKey:save_pkcs8_encrypted_file("myPassword", "privKey_enc_pkcs8.der")

-- Save the private key to unencrypted PKCS8 PEM
success = privKey:save_pkcs8_pem_file("privKey.pem")

-- Save the private key to encrypted PKCS8 PEM
success = privKey:save_pkcs8_encrypted_pem_file("myPassword", "privKey_enc.pem")