Extension for Burp Suite - to be used via Session Handling Rules.
Will add Authorization header looking somewhat like this:
Authorization: amx fd5a33d2ac52234ec6ff79ca526ef305:FjfyFpH8W8xIllBReGl0kiiXhYZTRQoyLXluwsEIhtE=:3265893b-aa4d-4d70-97ae-ea10ae73dc16:1513739146
Configure via newly added "AMX Auth" tab.
Standard Maven project, checkout and:
mvn install
use the jar file from target/ directory.