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trezor-firmware/embed/trezorhal/rng.h

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#ifndef TREZORHAL_RNG_H
#define TREZORHAL_RNG_H
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#include <stdint.h>
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void rng_init(void);
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uint32_t rng_read(const uint32_t previous, const uint32_t compare_previous);
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uint32_t rng_get(void);
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#endif