generateRandomKey() breaks info table

[nicholashu]

Description

Using Craft::$app->security->generateRandomKey() as a setting value generated a non supported character breaking the info table. It failed to generate a base64 config string and the unserialised config was broken at the value.

Steps to reproduce

1. run Craft::$app->plugins->savePluginSettings($this, ['key' => Craft::$app->security->generateRandomKey()] in init()

Additional info

• Craft version: 3.1.15
• PHP version: 7.2.6
• Database driver & version: MySQL 5.7.12
• Plugins & versions: custom plugin

[brandonkelly]

I wasn’t able to reproduce this consistently – many strings returned by generateRandomKey() work just fine – but I could with the following string (base64-encoded):

ITcFFy6t0+k1F6FWtbrmR+IAoNG/oCHiaJfpca9F4zo=

With that (decoded), I was getting an “Incorrect string value” SQL error, because it contains a non-UTF-8 character.

Fixed for today’s release.