crypto: rng - Convert low-level crypto_rng to new style
This patch converts the low-level crypto_rng interface to the
"new" style.
This allows existing implementations to be converted over one-
by-one. Once that is complete we can then remove the old rng
interface.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/crypto/rng.h b/include/crypto/rng.h
index 7fca371..133f044 100644
--- a/include/crypto/rng.h
+++ b/include/crypto/rng.h
@@ -15,11 +15,48 @@
#include <linux/crypto.h>
+struct crypto_rng;
+
+/**
+ * struct rng_alg - random number generator definition
+ *
+ * @generate: The function defined by this variable obtains a
+ * random number. The random number generator transform
+ * must generate the random number out of the context
+ * provided with this call, plus any additional data
+ * if provided to the call.
+ * @seed: Seed or reseed the random number generator. With the
+ * invocation of this function call, the random number
+ * generator shall become ready fo generation. If the
+ * random number generator requires a seed for setting
+ * up a new state, the seed must be provided by the
+ * consumer while invoking this function. The required
+ * size of the seed is defined with @seedsize .
+ * @seedsize: The seed size required for a random number generator
+ * initialization defined with this variable. Some
+ * random number generators does not require a seed
+ * as the seeding is implemented internally without
+ * the need of support by the consumer. In this case,
+ * the seed size is set to zero.
+ * @base: Common crypto API algorithm data structure.
+ */
+struct rng_alg {
+ int (*generate)(struct crypto_rng *tfm,
+ const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int dlen);
+ int (*seed)(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);
+
+ unsigned int seedsize;
+
+ struct crypto_alg base;
+};
+
struct crypto_rng {
int (*generate)(struct crypto_rng *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int dlen);
int (*seed)(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);
+ unsigned int seedsize;
struct crypto_tfm base;
};
@@ -72,7 +109,8 @@
*/
static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm)
{
- return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng;
+ return container_of(crypto_rng_tfm(tfm)->__crt_alg,
+ struct rng_alg, base);
}
/**
@@ -156,7 +194,7 @@
*/
static inline int crypto_rng_seedsize(struct crypto_rng *tfm)
{
- return crypto_rng_alg(tfm)->seedsize;
+ return tfm->seedsize;
}
#endif