Simple OTP lib for OpenResty

• base32_encode
• base32_decode
• TOTP
• HOTP

---

Calculate token

    local module_otp = require ("otp")
    local OTP = module_otp.totp_init("JBSWY3DPEHPK3PXP")
    ngx.say("TOTP_Token -> ", OTP:calc_token())

Output

    TOTP_Token -> 123456

---

Generate QR Code

local OTP = module_otp.totp_init("JBSWY3DPEHPK3PXP")
local url = OTP:get_qr_url('OpenResty-TOTP', 'hello@example.com')
local html = [[
<img src='%s' />
]]

html = string.format(html, url)
ngx.header['Content-Type'] = 'text/html'
ngx.say(html)

Output

Scan the QR Code with Google Authenticator

---

Verify OTP

local module_otp = require ("otp")
local OTP = module_otp.totp_init("JBSWY3DPEHPK3PXP")
local token = ngx.var.arg_otp
ngx.say("Verify Token : ", OTP:verify_token(token))

Use OTP from Google Authenticator

curl localhost/check?otp=734923

Output

Verify Token : true

Thanks! alues