Lua Requires Chilkat v10.1.2+

Find Certificate by Email Address

See more Cert Store Examples

Demonstrates how to find a certificate having the specified email address either within the cert's subject email, or the RFC822 name.

In an X.509 certificate, an email address can typically be located in two places:

1. RFC822 Name (Subject Alternative Name extension) -
   • The certificate may include an email address in the Subject Alternative Name (SAN) extension under the RFC822 Name field. This is a modern and preferred method because it allows for flexibility and alignment with security best practices.
   • To find it, Chilkat inspects the SAN extension in the certificate details.
2. Subject (Common Name or Email Address attribute) -
   • Older certificates may store the email address directly in the Subject field, typically under the Email Address attribute ("emailAddress") or, less commonly, the Common Name (CN).
   • This method is less preferred in modern standards but can still be encountered in legacy implementations. Chilkat also searches here for the email address.

Lua

local chilkat = require("chilkat")

local certStore = chilkat.CertStore.new()

-- This opens the Current User certificate store on Windows,
-- On MacOS and iOS it opens the default Keychain.
local readOnly = false
local success = certStore:open_current_user_store(readOnly)
if not success then
    print(certStore.last_error_text)
    return
end

-- Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
local json = chilkat.JsonObject.new()
local email_address = "joe@example.com"
json:update_string("email", email_address)

local cert = chilkat.Cert.new()
success = certStore:find_cert(json, cert)
if success then
    -- Show the full distinguished name of the certificate.
    print("Found: " .. cert.subject_dn)
else
    print("Not found.")
end