for a := uint16(0); a < 1<<bits; a++ { f := decompress(a, bits) if f >= q { t.Fatalf("decompress(%d, %d) = %d >= q", a, bits, f) } got := compress(f, bits) if got != a { t.Fatalf("compress(decompress(%d, %d), %d) = %d", a, bits, bits, got) } } for a := fieldElement(0); a < q; a++ { c := compress(a, bits) if c >= 1<<bits { t.Fatalf("compress(%d, %d) = %d >= 2^bits", a, bits, c) } got := decompress(c, bits) diff := min(a-got, got-a, a-got+q, got-a+q) ceil := q / (1 << bits) if diff > fieldElement(ceil)...