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-rw-r--r--lib/random32.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/lib/random32.c b/lib/random32.c
index d1830fade915..52280d5526be 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -77,6 +77,55 @@ u32 prandom_u32(void)
}
EXPORT_SYMBOL(prandom_u32);
+/*
+ * prandom_bytes_state - get the requested number of pseudo-random bytes
+ *
+ * @state: pointer to state structure holding seeded state.
+ * @buf: where to copy the pseudo-random bytes to
+ * @bytes: the requested number of bytes
+ *
+ * This is used for pseudo-randomness with no outside seeding.
+ * For more random results, use prandom_bytes().
+ */
+void prandom_bytes_state(struct rnd_state *state, void *buf, int bytes)
+{
+ unsigned char *p = buf;
+ int i;
+
+ for (i = 0; i < round_down(bytes, sizeof(u32)); i += sizeof(u32)) {
+ u32 random = prandom_u32_state(state);
+ int j;
+
+ for (j = 0; j < sizeof(u32); j++) {
+ p[i + j] = random;
+ random >>= BITS_PER_BYTE;
+ }
+ }
+ if (i < bytes) {
+ u32 random = prandom_u32_state(state);
+
+ for (; i < bytes; i++) {
+ p[i] = random;
+ random >>= BITS_PER_BYTE;
+ }
+ }
+}
+EXPORT_SYMBOL(prandom_bytes_state);
+
+/**
+ * prandom_bytes - get the requested number of pseudo-random bytes
+ * @buf: where to copy the pseudo-random bytes to
+ * @bytes: the requested number of bytes
+ */
+void prandom_bytes(void *buf, int bytes)
+{
+ struct rnd_state *state = &get_cpu_var(net_rand_state);
+
+ prandom_bytes_state(state, buf, bytes);
+ put_cpu_var(state);
+}
+EXPORT_SYMBOL(prandom_bytes);
+
/**
* prandom_seed - add entropy to pseudo random number generator
* @seed: seed value