diff options
Diffstat (limited to 'wrapper.h')
| -rw-r--r-- | wrapper.h | 34 |
1 files changed, 30 insertions, 4 deletions
@@ -127,17 +127,43 @@ int open_nofollow(const char *path, int flags); void sleep_millisec(int millisec); +enum { + /* + * Accept insecure bytes, which some CSPRNG implementations may return + * in case the entropy pool has been exhausted. + */ + CSPRNG_BYTES_INSECURE = (1 << 0), +}; + /* * Generate len bytes from the system cryptographically secure PRNG. * Returns 0 on success and -1 on error, setting errno. The inability to - * satisfy the full request is an error. + * satisfy the full request is an error. Accepts CSPRNG flags. */ -int csprng_bytes(void *buf, size_t len); +int csprng_bytes(void *buf, size_t len, unsigned flags); /* * Returns a random uint32_t, uniformly distributed across all possible - * values. + * values. Accepts CSPRNG flags. */ -uint32_t git_rand(void); +uint32_t git_rand(unsigned flags); + +/* Provide log2 of the given `size_t`. */ +static inline unsigned log2u(uintmax_t sz) +{ + unsigned l = 0; + + /* + * Technically this isn't required, but it helps the compiler optimize + * this to a `bsr` instruction. + */ + if (!sz) + return 0; + + for (; sz; sz >>= 1) + l++; + + return l - 1; +} #endif /* WRAPPER_H */ |