livecodingspace-app/public/lib/gundb/sea/encrypt.js

    var SEA = require('./root');
    var shim = require('./shim');
    var S = require('./settings');
    var aeskey = require('./aeskey');

    SEA.encrypt = SEA.encrypt || (async (data, pair, cb, opt) => { try {
      opt = opt || {};
      var key = (pair||opt).epriv || pair;
      if(!key){
        pair = await SEA.I(null, {what: data, how: 'encrypt', why: opt.why});
        key = pair.epriv || pair;
      }
      const msg = JSON.stringify(data)
      const rand = {s: shim.random(8), iv: shim.random(16)};
      const ct = await aeskey(key, rand.s, opt)
      .then((aes) => (/*shim.ossl ||*/ shim.subtle).encrypt({ // Keeping the AES key scope as private as possible...
        name: opt.name || 'AES-GCM', iv: new Uint8Array(rand.iv)
      }, aes, new shim.TextEncoder().encode(msg)))
      const r = 'SEA'+JSON.stringify({
        ct: shim.Buffer.from(ct, 'binary').toString(opt.encode || 'base64'),
        iv: rand.iv.toString(opt.encode || 'base64'),
        s: rand.s.toString(opt.encode || 'base64')
      });

      if(cb){ try{ cb(r) }catch(e){console.log(e)} }
      return r;
    } catch(e) { 
      SEA.err = e;
      if(SEA.throw){ throw e }
      if(cb){ cb() }
      return;
    }});

    module.exports = SEA.encrypt;