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Give possibility to make glibc PRNG work for every seed

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Because of the modulo trick the current glibc PRNG version doesn't work for seed == 0x7fffffff or seed == 0xfffffffe.

The former is used only if the user specifically uses --start / --end 02/2038. The latter is never used as negative values are not legal for time.

In any case a compilation guard (PWPS_UNERRING) has been added for correctness to make the PRNG spit correct values even for those 2 seeds.
This commit is contained in:
wiire-a 2018-01-11 23:31:50 +01:00
parent 0584a78d9b
commit c44ce9e923
1 changed files with 10 additions and 0 deletions
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10
src/random/glibc_random_yura.c
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@ -18,6 +18,11 @@ static inline uint32_t *glibc_fast_nonce(uint32_t seed, uint32_t *dest)
{
uint32_t word0 = 0, word1 = 0, word2 = 0, word3 = 0;
#ifdef PWPS_UNERRING
if (seed == 0x7fffffff) seed = 0x13f835f3;
else if (seed == 0xfffffffe) seed = 0x5df735f1;
#endif
for (int j = 0; j < 31; j++) {
word0 += seed * glibc_seed_tbl[j + 3];
word1 += seed * glibc_seed_tbl[j + 2];
@ -42,6 +47,11 @@ static inline uint32_t glibc_fast_seed(uint32_t seed)
{
uint32_t word0 = 0;
#ifdef PWPS_UNERRING
if (seed == 0x7fffffff) seed = 0x13f835f3;
else if (seed == 0xfffffffe) seed = 0x5df735f1;
#endif
for (int j = 3; j < 31 + 3 - 1; j++) {
word0 += seed * glibc_seed_tbl[j];