46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
#include <tomcrypt_test.h>
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#ifdef LTC_PRNG_ENABLE_LTC_RNG
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static unsigned long my_test_rng_read;
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static unsigned long my_test_rng(unsigned char *buf, unsigned long len,
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void (*callback)(void))
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{
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unsigned long n;
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LTC_UNUSED_PARAM(callback);
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for (n = 0; n < len; ++n) {
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buf[n] = 4;
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}
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my_test_rng_read += n;
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return n;
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}
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#endif
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int prng_test(void)
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{
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int err = CRYPT_NOP;
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#ifdef LTC_PRNG_ENABLE_LTC_RNG
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unsigned long before;
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unsigned long (*previous)(unsigned char *, unsigned long , void (*)(void)) = ltc_rng;
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ltc_rng = my_test_rng;
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before = my_test_rng_read;
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if ((err = rng_make_prng(128, find_prng("yarrow"), &yarrow_prng, NULL)) != CRYPT_OK) {
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fprintf(stderr, "rng_make_prng with 'my_test_rng' failed: %s\n", error_to_string(err));
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exit(EXIT_FAILURE);
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}
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if (before == my_test_rng_read) {
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fprintf(stderr, "somehow there was no read from the ltc_rng! %lu == %lu\n", before, my_test_rng_read);
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exit(EXIT_FAILURE);
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}
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ltc_rng = previous;
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#endif
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return err;
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}
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