mirror of https://github.com/google/oss-fuzz.git
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
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#ifndef FAKE_RANDOM_H_
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#define FAKE_RANDOM_H_
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#include <sodium.h>
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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#include <algorithm>
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static const unsigned char * SEED_DATA;
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static size_t SEED_SIZE;
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static const char *
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fake_implementation_name(void) {
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return "fake_random";
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}
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static void
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fake_random_buffer(void * const buf, const size_t size) {
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static unsigned char seed[randombytes_SEEDBYTES];
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memset(seed, '0', randombytes_SEEDBYTES);
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size_t boundary = std::min((size_t) randombytes_SEEDBYTES, SEED_SIZE);
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memcpy(&seed, SEED_DATA, boundary);
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randombytes_buf_deterministic(buf, size, seed);
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}
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struct randombytes_implementation fake_random = {
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.implementation_name = fake_implementation_name,
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.random = NULL,
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.stir = NULL,
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.uniform = NULL,
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.buf = fake_random_buffer,
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.close = NULL
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};
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void
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setup_fake_random(const unsigned char * seed, const size_t seed_size) {
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SEED_DATA = seed;
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SEED_SIZE = seed_size;
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int fake_random_set = randombytes_set_implementation(&fake_random);
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assert(fake_random_set == 0);
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assert(randombytes_implementation_name() == "fake_random");
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int initialized = sodium_init();
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assert(initialized >= 0);
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}
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#endif // FAKE_RANDOM_H_
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