Test prg().
t { ubyte[32] seed = 0; ubyte[96] expanded; prg(expanded, seed); assert(expanded == x" 9bf49a6a0755f953811fce125f2683d50429c3bb49e074147e0089a52eae155f 0564f879d27ae3c02ce82834acfa8c793a629f2ca0de6919610be82f411326be 0bd58841203e74fe86fc71338ce0173dc628ebb719bdcbcc151585214cc089b4", "prg() failed"
Generate a pseudo random sequence from a given seed.