d94f42f6e2
This package provides access to an operating system resource
(cryptographic numbers) and so needs to be replaced with a TinyGo
version that does this in a different way.
I've made the following choices while adding this feature:
- I'm using the getentropy call whenever possible (most POSIX like
systems), because it is easier to use and more reliable. Linux is
the exception: it only added getentropy relatively recently.
- I've left bare-metal implementations to a future patch. This because
it's hard to reliably get cryptographically secure random numbers on
embedded devices: most devices do not have a hardware PRNG for this
purpose.
46 строки
982 Б
Go
46 строки
982 Б
Go
package main
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import (
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"crypto/rand"
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"os"
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)
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func main() {
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// Check for environment variables (set by the test runner).
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println("ENV1:", os.Getenv("ENV1"))
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v, ok := os.LookupEnv("ENV2")
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if !ok {
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println("ENV2 not found")
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}
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println("ENV2:", v)
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// Check for command line arguments.
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// Argument 0 is skipped because it is the program name, which varies by
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// test run.
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println()
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for _, arg := range os.Args[1:] {
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println("arg:", arg)
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}
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// Check for crypto/rand support.
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checkRand()
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}
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func checkRand() {
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buf := make([]byte, 500)
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n, err := rand.Read(buf)
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if n != len(buf) || err != nil {
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println("could not read random numbers:", err)
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}
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// Very simple test that random numbers are at least somewhat random.
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sum := 0
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for _, b := range buf {
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sum += int(b)
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}
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if sum < 95*len(buf) || sum > 159*len(buf) {
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println("random numbers don't seem that random, the average byte is", sum/len(buf))
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} else {
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println("random number check was successful")
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}
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}
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