crypto: rng - Add multiple algorithm registration interface

This patch adds the helpers that allow the registration and removal
of multiple RNG algorithms.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 31 insertions, 0 deletions

diff --git a/crypto/rng.c b/crypto/rng.c
index 5e0425a24657..e98ce1ca527d 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -233,5 +233,34 @@ void crypto_unregister_rng(struct rng_alg *alg)
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_rng);
 
+int crypto_register_rngs(struct rng_alg *algs, int count)
+{
+        int i, ret;
+
+        for (i = 0; i < count; i++) {
+                ret = crypto_register_rng(algs + i);
+                if (ret)
+                        goto err;
+        }
+
+        return 0;
+
+err:
+        for (--i; i >= 0; --i)
+                crypto_unregister_rng(algs + i);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_register_rngs);
+
+void crypto_unregister_rngs(struct rng_alg *algs, int count)
+{
+        int i;
+
+        for (i = count - 1; i >= 0; --i)
+                crypto_unregister_rng(algs + i);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_rngs);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Random Number Generator");
diff --git a/include/crypto/internal/rng.h b/include/crypto/internal/rng.h
index 93d41bcc444e..2c9a865c66e2 100644
--- a/include/crypto/internal/rng.h
+++ b/include/crypto/internal/rng.h
@@ -20,6 +20,8 @@ extern const struct crypto_type crypto_rng_type;
 
 int crypto_register_rng(struct rng_alg *alg);
 void crypto_unregister_rng(struct rng_alg *alg);
+int crypto_register_rngs(struct rng_alg *algs, int count);
+void crypto_unregister_rngs(struct rng_alg *algs, int count);
 
 static inline void *crypto_rng_ctx(struct crypto_rng *tfm)
 {