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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-17 20:07:31 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:16:42 +1100
commit378f4f51f9fdd8df80ea875320e2bf1d7c6e6e77 (patch)
treef38f23fa09ec7971546a0a3aa42a79cc055c455f /include/crypto
parent84c911523020a2e39b307a2da26ee1886b7214fe (diff)
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[CRYPTO] skcipher: Add crypto_grab_skcipher interface
Note: From now on the collective of ablkcipher/blkcipher/givcipher will be known as skcipher, i.e., symmetric key cipher. The name blkcipher has always been much of a misnomer since it supports stream ciphers too. This patch adds the function crypto_grab_skcipher as a new way of getting an ablkcipher spawn. The problem is that previously we did this in two steps, first getting the algorithm and then calling crypto_init_spawn. This meant that each spawn user had to be aware of what type and mask to use for these two steps. This is difficult and also presents a problem when the type/mask changes as they're about to be for IV generators. The new interface does both steps together just like crypto_alloc_ablkcipher. As a side-effect this also allows us to be stronger on type enforcement for spawns. For now this is only done for ablkcipher but it's trivial to extend for other types. This patch also moves the type/mask logic for skcipher into the helpers crypto_skcipher_type and crypto_skcipher_mask. Finally this patch introduces the function crypto_require_sync to determine whether the user is specifically requesting a sync algorithm. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/algapi.h22
-rw-r--r--include/crypto/internal/skcipher.h51
2 files changed, 69 insertions, 4 deletions
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 726a765e5ec..fda1759ffe2 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -111,6 +111,12 @@ void crypto_drop_spawn(struct crypto_spawn *spawn);
struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
u32 mask);
+static inline void crypto_set_spawn(struct crypto_spawn *spawn,
+ struct crypto_instance *inst)
+{
+ spawn->inst = inst;
+}
+
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
int crypto_check_attr_type(struct rtattr **tb, u32 type);
const char *crypto_attr_alg_name(struct rtattr *rta);
@@ -195,10 +201,9 @@ static inline struct crypto_instance *crypto_aead_alg_instance(
static inline struct crypto_ablkcipher *crypto_spawn_ablkcipher(
struct crypto_spawn *spawn)
{
- u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
- u32 mask = CRYPTO_ALG_TYPE_BLKCIPHER_MASK;
-
- return __crypto_ablkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
+ return __crypto_ablkcipher_cast(
+ crypto_spawn_tfm(spawn, crypto_skcipher_type(0),
+ crypto_skcipher_mask(0)));
}
static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
@@ -308,5 +313,14 @@ static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
return crypto_attr_alg(tb[1], type, mask);
}
+/*
+ * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
+ * Otherwise returns zero.
+ */
+static inline int crypto_requires_sync(u32 type, u32 mask)
+{
+ return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
+}
+
#endif /* _CRYPTO_ALGAPI_H */
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
new file mode 100644
index 00000000000..87879e64ff4
--- /dev/null
+++ b/include/crypto/internal/skcipher.h
@@ -0,0 +1,51 @@
+/*
+ * Symmetric key ciphers.
+ *
+ * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#ifndef _CRYPTO_INTERNAL_SKCIPHER_H
+#define _CRYPTO_INTERNAL_SKCIPHER_H
+
+#include <crypto/algapi.h>
+
+struct crypto_skcipher_spawn {
+ struct crypto_spawn base;
+};
+
+static inline void crypto_set_skcipher_spawn(
+ struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
+{
+ crypto_set_spawn(&spawn->base, inst);
+}
+
+int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
+ u32 type, u32 mask);
+
+static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
+{
+ crypto_drop_spawn(&spawn->base);
+}
+
+static inline struct crypto_alg *crypto_skcipher_spawn_alg(
+ struct crypto_skcipher_spawn *spawn)
+{
+ return spawn->base.alg;
+}
+
+static inline struct crypto_ablkcipher *crypto_spawn_skcipher(
+ struct crypto_skcipher_spawn *spawn)
+{
+ return __crypto_ablkcipher_cast(
+ crypto_spawn_tfm(&spawn->base, crypto_skcipher_type(0),
+ crypto_skcipher_mask(0)));
+}
+
+#endif /* _CRYPTO_INTERNAL_SKCIPHER_H */
+