code: func (c *pubKeyCache) get(user string, pubKeyData []byte) (cachedPubKey, bool) {
  	for _, k := range c.keys {
  		if k.user == user && bytes.Equal(k.pubKeyData, pubKeyData) {
  			return k, true
  		}
  	}
  	return cachedPubKey{}, false
  }
docs: // get returns the result for a given user/algo/key tuple.