The package golang-go.crypto 1:0.0~git20170407.0.55a552f+REALLY.0.0~git20161012.0.5f31782-1 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/golang-go.crypto -- More information about golang-go.crypto: http://pkg.kali.org/pkg/golang-go.crypto