Package rand
Package rand implements a cryptographically secure
pseudorandom number generator.
In the call graph viewer below, each node
is a function belonging to this package
and its children are the functions it
calls—perhaps dynamically.
The root nodes are the entry points of the
package: functions that may be called from
outside the package.
There may be non-exported or anonymous
functions among them if they are called
dynamically from another package.
Click a node to visit that function's source code.
From there you can visit its callers by
clicking its declaring func
token.
Functions may be omitted if they were
determined to be unreachable in the
particular programs or tests that were
analyzed.
Variables
var Reader io.Reader
Reader is a global, shared instance of a cryptographically
strong pseudo-random generator.
On Unix-like systems, Reader reads from /dev/urandom.
On Linux, Reader uses getrandom(2) if available, /dev/urandom otherwise.
On Windows systems, Reader uses the CryptGenRandom API.
func Int(rand io.Reader, max *big.Int) (n *big.Int, err error)
Int returns a uniform random value in [0, max). It panics if max <= 0.
func Prime(rand io.Reader, bits int) (p *big.Int, err error)
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.
func Read(b []byte) (n int, err error)
Read is a helper function that calls Reader.Read using io.ReadFull.
On return, n == len(b) if and only if err == nil.
▾ Example
This example reads 10 cryptographically secure pseudorandom numbers from
rand.Reader and writes them to a byte slice.