27 lines
842 B
C
27 lines
842 B
C
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// Note: All particle platforms except for the Spark Core have a HW RNG. Only allow building on
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// supported platforms for now. PLATFORM_ID definitions:
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// https://github.com/particle-iot/device-os/blob/mesh-develop/hal/shared/platforms.h
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#include <Particle.h>
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static int
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hydro_random_init(void)
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{
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const char ctx[hydro_hash_CONTEXTBYTES] = { 'h', 'y', 'd', 'r', 'o', 'P', 'R', 'G' };
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hydro_hash_state st;
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uint16_t ebits = 0;
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hydro_hash_init(&st, ctx, NULL);
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while (ebits < 256) {
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uint32_t r = HAL_RNG_GetRandomNumber();
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hydro_hash_update(&st, (const uint32_t *) &r, sizeof r);
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ebits += 32;
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}
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hydro_hash_final(&st, hydro_random_context.state, sizeof hydro_random_context.state);
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hydro_random_context.counter = ~LOAD64_LE(hydro_random_context.state);
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return 0;
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}
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