From 43a123c1ae6613b3efeed291fa552ecd909d3acf Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 16 Apr 2024 21:23:18 +0200 Subject: Adding upstream version 1.20.14. Signed-off-by: Daniel Baumann --- src/crypto/rand/rand.go | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 src/crypto/rand/rand.go (limited to 'src/crypto/rand/rand.go') diff --git a/src/crypto/rand/rand.go b/src/crypto/rand/rand.go new file mode 100644 index 0000000..af85b96 --- /dev/null +++ b/src/crypto/rand/rand.go @@ -0,0 +1,44 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package rand implements a cryptographically secure +// random number generator. +package rand + +import "io" + +// Reader is a global, shared instance of a cryptographically +// secure random number generator. +// +// On Linux, FreeBSD, Dragonfly and Solaris, Reader uses getrandom(2) if +// available, /dev/urandom otherwise. +// On OpenBSD and macOS, Reader uses getentropy(2). +// On other Unix-like systems, Reader reads from /dev/urandom. +// On Windows systems, Reader uses the RtlGenRandom API. +// On Wasm, Reader uses the Web Crypto API. +var Reader io.Reader + +// Read is a helper function that calls Reader.Read using io.ReadFull. +// On return, n == len(b) if and only if err == nil. +func Read(b []byte) (n int, err error) { + return io.ReadFull(Reader, b) +} + +// batched returns a function that calls f to populate a []byte by chunking it +// into subslices of, at most, readMax bytes. +func batched(f func([]byte) error, readMax int) func([]byte) error { + return func(out []byte) error { + for len(out) > 0 { + read := len(out) + if read > readMax { + read = readMax + } + if err := f(out[:read]); err != nil { + return err + } + out = out[read:] + } + return nil + } +} -- cgit v1.2.3