diff options
| -rw-r--r-- | drivers/char/random.c | 15 | ||||
| -rw-r--r-- | include/linux/random.h | 1 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 561082d46a82..bf5f99fc36f1 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -1664,6 +1664,21 @@ int wait_for_random_bytes(void) EXPORT_SYMBOL(wait_for_random_bytes); /* + * Returns whether or not the urandom pool has been seeded and thus guaranteed + * to supply cryptographically secure random numbers. This applies to: the + * /dev/urandom device, the get_random_bytes function, and the get_random_{u32, + * ,u64,int,long} family of functions. + * + * Returns: true if the urandom pool has been seeded. + * false if the urandom pool has not been seeded. + */ +bool rng_is_initialized(void) +{ + return crng_ready(); +} +EXPORT_SYMBOL(rng_is_initialized); + +/* * Add a callback function that will be invoked when the nonblocking * pool is initialised. * diff --git a/include/linux/random.h b/include/linux/random.h index f1c9bc5cd231..445a0ea4ff49 100644 --- a/include/linux/random.h +++ b/include/linux/random.h @@ -36,6 +36,7 @@ extern void add_interrupt_randomness(int irq, int irq_flags) __latent_entropy; extern void get_random_bytes(void *buf, int nbytes); extern int wait_for_random_bytes(void); +extern bool rng_is_initialized(void); extern int add_random_ready_callback(struct random_ready_callback *rdy); extern void del_random_ready_callback(struct random_ready_callback *rdy); extern int __must_check get_random_bytes_arch(void *buf, int nbytes); |