mirror of
https://github.com/trezor/trezor-firmware.git
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33 lines
539 B
C
33 lines
539 B
C
/*
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* Copyright (c) Pavol Rusnak, SatoshiLabs
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*
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* Licensed under TREZOR License
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* see LICENSE file for details
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*/
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#include "rand.h"
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#include "rng.h"
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uint32_t random32(void)
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{
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return rng_get();
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}
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uint32_t random_uniform(uint32_t n)
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{
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uint32_t x, max = 0xFFFFFFFF - (0xFFFFFFFF % n);
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while ((x = random32()) >= max);
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return x / (max / n);
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}
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void random_buffer(uint8_t *buf, size_t len)
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{
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uint32_t r = 0;
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for (size_t i = 0; i < len; i++) {
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if (i % 4 == 0) {
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r = random32();
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}
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buf[i] = (r >> ((i % 4) * 8)) & 0xFF;
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}
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}
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