Lua Requires Chilkat v11.0.0+

Get ETK Public Key (api-acpt.ehealth.fgov.be)

See more Belgian eHealth Platform Examples

The following URL returns JSON, which contains a PKCS7 signed data:

https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN

This example extracts the signed data, validates it, and then extracts the public key from the certificate (obtained from signed content in the PKCS7)

Note: The URL above uses "12345678901" which is not valid. You should replace it with a valid number.

Lua

local chilkat = require("chilkat")

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

local http = chilkat.Http.new()

local jsonStr = http:quick_get_str("https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN")
if not http.last_method_success then
    print(http.last_error_text)
    return
end

print(jsonStr)

-- The JSON contains something like this:

-- [
--     {
--         "key": {
--             "applicationIdentifier": "",
--             "ssin": "12345678901"
--         },
--         "value": "MIAGCSq....AAAAAAAA=="
--     }
-- ]

-- Note: The above is a JSON array (not a JSON object)
-- It should be loaded into a Chilkat JSON array.
local jarr = chilkat.JsonArray.new()
local success = jarr:load(jsonStr)
if not success then
    print("Failed to load JSON.")
    return
end

local json = jarr:object_at(0)
local bdPkcs7 = chilkat.BinData.new()
bdPkcs7:append_encoded(json:string_of("value"), "base64")

-- Let's verify the PKCS7, and then examine the signing cert,
-- and get the signing cert's public key.
local crypt = chilkat.Crypt2.new()

-- Validate the signedData PKCS7, and replace the contents of bdPkcs7 with the extracted signed content.
success = crypt:opaque_verify_bd(bdPkcs7)
if not success then
    print(crypt.last_error_text)
    return
end

-- The signed content is the DER of a certificate.
-- In other words, bdPkcs7 now contains a certificate.
local cert = chilkat.Cert.new()
success = cert:load_from_bd(bdPkcs7)
if not success then
    print(cert.last_error_text)
    return
end

-- Show some certificate information:
print("Subject: " .. cert.subject_dn)
print("Serial: " .. cert.serial_number)
print("Issuer: " .. cert.issuer_dn)

-- Let's get the cert's public key...
local pubKey = chilkat.PublicKey.new()
cert:get_public_key(pubKey)

-- OK, you now have the public key and can do whatever is needed..
print(pubKey.key_type)
print(pubKey.key_size)