Signing with Ed25519 algorithm in Openresty

This module provides FFI interface to create signatures using EdDSA Ed25519 algorithm. It uses openssl to do the signing. Openresty's ngx_http_lua_ffi_decode_base64 function is used for decoding private key from base64.

How to use

Copy file lib/resty/signEd25519.lua to the resty folder under lualib, e.g. /usr/local/openresty/site/lualib/resty.

Use in your code like this:

local eddsa = require("resty.eddsa")

-- private key in base64
local keyInBase64 = "123456789+abcdefghijklmnopqrstuvwxyz+123450="

eddsa.signEd25519(keyInBase64, "message to sign")

NB! The key should be in RAW format, so e.g. if you have a PEM file (you can generate one using command openssl genpkey -algorithm ed25519 -outform PEM -out private_key.pem), you would need to do something like this:

$ openssl pkey -in private_key.pem -noout -text | sed 1,2d | tr -d '\n\r :' | xxd -r -p | base64

TypescriptToLua users:

Install from NPM:

npm i resty.eddsa

Then use from TS like this:

import {signEd25519} from "resty.eddsa"

signEd25519(privateKeyInBase64, "message to sign");