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Ayke van Laethem
e9003e2deb
This function is needed for Go 1.22, and is used from various packages like math/rand. When there is no random number generator available, it falls back to a static sequence of numbers. I think this is fine, because as far as I can see it is only used for non-cryptographic needs.
39 lines
629 B
Go
39 lines
629 B
Go
//go:build nrf || (stm32 && !(stm32f103 || stm32l0x1)) || (sam && atsamd51) || (sam && atsame5x) || esp32c3
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// If you update the above build constraint, you'll probably also need to update
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// src/runtime/rand_hwrng.go.
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package rand
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import (
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"machine"
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)
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func init() {
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Reader = &reader{}
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}
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type reader struct {
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}
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func (r *reader) Read(b []byte) (n int, err error) {
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if len(b) == 0 {
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return
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}
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var randomByte uint32
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for i := range b {
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if i%4 == 0 {
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randomByte, err = machine.GetRNG()
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if err != nil {
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return n, err
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}
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} else {
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randomByte >>= 8
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}
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b[i] = byte(randomByte)
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}
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return len(b), nil
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}
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