diff options
Diffstat (limited to 'drivers/char/random.c')
| -rw-r--r-- | drivers/char/random.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 8cc7d6515676..d07575c99a5f 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -1012,23 +1012,23 @@ static void extract_buf(struct entropy_store *r, __u8 *out) __u8 extract[64]; unsigned long flags; - /* Generate a hash across the pool, 16 words (512 bits) at a time */ - sha_init(hash.w); - spin_lock_irqsave(&r->lock, flags); - for (i = 0; i < r->poolinfo->poolwords; i += 16) - sha_transform(hash.w, (__u8 *)(r->pool + i), workspace); - /* * If we have an architectural hardware random number - * generator, mix that in, too. + * generator, use it for SHA's initial vector */ + sha_init(hash.w); for (i = 0; i < LONGS(20); i++) { unsigned long v; if (!arch_get_random_long(&v)) break; - hash.l[i] ^= v; + hash.l[i] = v; } + /* Generate a hash across the pool, 16 words (512 bits) at a time */ + spin_lock_irqsave(&r->lock, flags); + for (i = 0; i < r->poolinfo->poolwords; i += 16) + sha_transform(hash.w, (__u8 *)(r->pool + i), workspace); + /* * We mix the hash back into the pool to prevent backtracking * attacks (where the attacker knows the state of the pool |