如何使用AES在sinatra中编码字符串？

require 'sinatra'
require 'openssl'
require 'base64'

def aes_encrypt(key, iv, plaintext)
  cipher = OpenSSL::Cipher.new('AES-256-CBC')
  cipher.encrypt
  cipher.key = key
  cipher.iv = iv
  encrypted = cipher.update(plaintext) + cipher.final
  Base64.encode64(encrypted)
end

get '/encrypt' do
  plaintext = params[:plaintext]
  key = 'your_aes_key'
  iv = 'your_aes_iv'
  encrypted_text = aes_encrypt(key, iv, plaintext)
  "Encrypted Text: #{encrypted_text}"
end