Package rand implements a cryptographically secure pseudorandom number generator.
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Reader is a global, shared instance of a cryptographically strong pseudo-random generator. On Unix-like systems, Reader reads from /dev/urandom. On Windows systems, Reader uses the CryptGenRandom API.
Int returns a uniform random value in [0, max). It panics if max <= 0.
Prime returns a number, p, of the given size, such that p is prime with high probability. Prime will return error for any error returned by rand.Read or if bits < 2.
Read is a helper function that calls Reader.Read using io.ReadFull. On return, n == len(b) if and only if err == nil.
This example reads 10 cryptographically secure pseudorandom numbers from rand.Reader and writes them to a byte slice.