crypto: rng - Introduce crypto_rng_generate
This patch adds the new top-level function crypto_rng_generate
which generates random numbers with additional input. It also
extends the mid-level rng_gen_random function to take additional
data as input.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/rng.c b/crypto/rng.c
index 87fa2f4..4514d37 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -36,6 +36,12 @@
return container_of(tfm, struct crypto_rng, base);
}
+static int generate(struct crypto_rng *tfm, const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int dlen)
+{
+ return crypto_rng_alg(tfm)->rng_make_random(tfm, dst, dlen);
+}
+
static int rngapi_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
{
u8 *buf = NULL;
@@ -59,9 +65,8 @@
static int crypto_rng_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_rng *rng = __crypto_rng_cast(tfm);
- struct rng_alg *alg = &tfm->__crt_alg->cra_rng;
- rng->generate = alg->rng_make_random;
+ rng->generate = generate;
rng->seed = rngapi_reset;
return 0;