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util: add UTI_GetRandomBytesUrandom()

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This function always uses /dev/urandom, even if arc4random() is
available, and is intended for generating long-term keys.
This commit is contained in:
Miroslav Lichvar
2016-01-13 11:57:36 +01:00
parent 0d12410eaa
commit 32ac6ffa26
2 changed files with 19 additions and 5 deletions
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7
util.h
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@@ -148,7 +148,12 @@ extern int UTI_CheckDirPermissions(const char *path, mode_t perm, uid_t uid, gid
/* Set process user/group IDs and drop supplementary groups */
extern void UTI_DropRoot(uid_t uid, gid_t gid);
/* Fill buffer with random bytes */
/* Fill buffer with random bytes from /dev/urandom */
extern void UTI_GetRandomBytesUrandom(void *buf, unsigned int len);
/* Fill buffer with random bytes from /dev/urandom or a faster source if it's
available (e.g. arc4random()), which may not necessarily be suitable for
generating long-term keys */
extern void UTI_GetRandomBytes(void *buf, unsigned int len);
/* Macros to get maximum and minimum of two values */