Package rand implements a cryptographically secure random number generator.
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Reader is a global, shared instance of a cryptographically secure random number generator.
On Linux, Reader uses getrandom(2) if available, /dev/urandom otherwise. On OpenBSD, Reader uses getentropy(2). On other Unix-like systems, Reader reads from /dev/urandom. On Windows systems, Reader uses the CryptGenRandom API. On Wasm, Reader uses the Web Crypto 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.