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authorAkinobu Mita <akinobu.mita@gmail.com>2012-12-17 16:04:25 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:26 -0800
commit6582c665d6b882dad8329e05749fbcf119f1ab88 (patch)
treec40cbd6ed26fb1fea9d63d9244e6ce377d8196fd /include
parent496f2f93b1cc286f5a4f4f9acdc1e5314978683f (diff)
prandom: introduce prandom_bytes() and prandom_bytes_state()
Add functions to get the requested number of pseudo-random bytes. The difference from get_random_bytes() is that it generates pseudo-random numbers by prandom_u32(). It doesn't consume the entropy pool, and the sequence is reproducible if the same rnd_state is used. So it is suitable for generating random bytes for testing. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Artem Bityutskiy <dedekind1@gmail.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Eilon Greenstein <eilong@broadcom.com> Cc: David Laight <david.laight@aculab.com> Cc: Michel Lespinasse <walken@google.com> Cc: Robert Love <robert.w.love@intel.com> Cc: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/random.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/random.h b/include/linux/random.h
index db6debc6649e..d9846088c2c5 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -26,6 +26,7 @@ unsigned int get_random_int(void);
unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
u32 prandom_u32(void);
+void prandom_bytes(void *buf, int nbytes);
void prandom_seed(u32 seed);
/*
@@ -36,6 +37,7 @@ void prandom_seed(u32 seed);
#define srandom32(seed) prandom_seed(seed)
u32 prandom_u32_state(struct rnd_state *);
+void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes);
/*
* Handle minimum values for seeds