Int63 returns a strongly random int63.

Int64 returns a strongly random int64.

Intn returns, as an int, a non-negative strongly random number in [0,n).

SeedFromBytes calculates a weak 64 bit hash from the given byte slice, suitable for use a predictable random seed.

String returns a strongly random string of characters (taken from randomCharset) of the specified length.

Reader is the standard crypto/rand.Reader, re-exported for convenience.