Add test cases for encrypt with broken rand reader
Add test cases for encrypt with broken rand reader

evanphx/go-jose,jmptrader/go-jose,liumingzhij26/go-jose,jsha/go-jose,rolandshoemaker/go-jose,rapropos/go-jose,jsha/go-jose,jmptrader/go-jose,bifurcation/go-jose,letsencrypt/go-jose,bifurcation/go-jose,rolandshoemaker/go-jose,evanphx/go-jose,letsencrypt/go-jose,liumingzhij26/go-jose