Use co-body directly instead of koa-body (which uses co-body under the hood)

src/route/rest.js

@@ -17,6 +17,7 @@
 
 'use strict';
 
+const parse = require('co-body');
 const util = require('../service/util');
 
 /**
@@ -37,7 +38,7 @@ class REST {
    * @param  {Object} ctx   The koa request/response context
    */
   async create(ctx) {
-    const {publicKeyArmored} = ctx.request.body;
+    const {publicKeyArmored} = await parse.json(ctx, {limit: '1mb'});
     if (!publicKeyArmored) {
       ctx.throw(400, 'Invalid request!');
     }