Support for RS256 (RSA Signature with SHA-256)

[admin]

Here are JWT libraries from https://github.com/cdbattags/lua-resty-jwt with some minor changes to work on LM. Create a use library with the same name for each attached file.

Code:

jwt = require "user.jwt"

jwt_token = jwt:sign(
  "my-secrect-key",
  {
    header={typ="JWT", alg="HS256"},
    payload={foo="bar"}
  }
)

log(jwt_token)