2086699b70
Only in developer mode, ofc. Notes: 1. We have to move the initialization before the lightningd main trace_start, since that uses pseudorand(). 2. To make the results stable, we need to use per-caller values to randbytes(). Otherwise external timing changes the call order. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
21 lines
617 B
C
21 lines
617 B
C
#ifndef LIGHTNING_COMMON_RANDBYTES_H
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#define LIGHTNING_COMMON_RANDBYTES_H
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#include "config.h"
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#include <ccan/short_types/short_types.h>
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#include <stdbool.h>
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#include <stddef.h>
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/* Usually the libsodium routine randombytes_buf, but dev options can make this deterministic */
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#define randbytes(bytes, num_bytes) \
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do { \
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static u64 offset; \
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randbytes_((bytes), (num_bytes), &offset); \
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} while(0)
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void randbytes_(void *bytes, size_t num_bytes, u64 *offset);
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void dev_override_randbytes(const char *argv0, long int seed);
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bool randbytes_overridden(void);
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#endif /* LIGHTNING_COMMON_RANDBYTES_H */
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