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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-05 21:08:36 +1100
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:16:44 +1100
commitecfc43292f68566c144afca966b46b371c26d56c (patch)
treeef332abe1573434836a90e188257a252ca9f896a /include
parent927eead52c958829ef62c8aa5da2751033a2cf98 (diff)
[CRYPTO] skcipher: Add skcipher_geniv_alloc/skcipher_geniv_free
This patch creates the infrastructure to help the construction of givcipher templates that wrap around existing blkcipher/ablkcipher algorithms by adding an IV generator to them. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include')
-rw-r--r--include/crypto/internal/skcipher.h18
-rw-r--r--include/linux/crypto.h18
2 files changed, 32 insertions, 4 deletions
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index c9402dd12d0..07e7c82324a 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -15,6 +15,9 @@
#include <crypto/algapi.h>
#include <crypto/skcipher.h>
+#include <linux/types.h>
+
+struct rtattr;
struct crypto_skcipher_spawn {
struct crypto_spawn base;
@@ -50,6 +53,21 @@ static inline struct crypto_ablkcipher *crypto_spawn_skcipher(
crypto_skcipher_mask(0)));
}
+const char *crypto_default_geniv(const struct crypto_alg *alg);
+
+struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
+ struct rtattr **tb, u32 type,
+ u32 mask);
+void skcipher_geniv_free(struct crypto_instance *inst);
+int skcipher_geniv_init(struct crypto_tfm *tfm);
+void skcipher_geniv_exit(struct crypto_tfm *tfm);
+
+static inline struct crypto_ablkcipher *skcipher_geniv_cipher(
+ struct crypto_ablkcipher *geniv)
+{
+ return crypto_ablkcipher_crt(geniv)->base;
+}
+
static inline void *skcipher_givcrypt_reqctx(
struct skcipher_givcrypt_request *req)
{
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index facafa1bd8c..fa7afa9b9f4 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -53,6 +53,12 @@
#define CRYPTO_ALG_NEED_FALLBACK 0x00000100
/*
+ * This bit is set for symmetric key ciphers that have already been wrapped
+ * with a generic IV generator to prevent them from being wrapped again.
+ */
+#define CRYPTO_ALG_GENIV 0x00000200
+
+/*
* Transform masks and values (for crt_flags).
*/
#define CRYPTO_TFM_REQ_MASK 0x000fff00
@@ -331,6 +337,8 @@ struct ablkcipher_tfm {
int (*givencrypt)(struct skcipher_givcrypt_request *req);
int (*givdecrypt)(struct skcipher_givcrypt_request *req);
+ struct crypto_ablkcipher *base;
+
unsigned int ivsize;
unsigned int reqsize;
};
@@ -541,14 +549,14 @@ static inline struct crypto_ablkcipher *__crypto_ablkcipher_cast(
static inline u32 crypto_skcipher_type(u32 type)
{
- type &= ~CRYPTO_ALG_TYPE_MASK;
+ type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
type |= CRYPTO_ALG_TYPE_BLKCIPHER;
return type;
}
static inline u32 crypto_skcipher_mask(u32 mask)
{
- mask &= ~CRYPTO_ALG_TYPE_MASK;
+ mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
mask |= CRYPTO_ALG_TYPE_BLKCIPHER_MASK;
return mask;
}
@@ -623,7 +631,9 @@ static inline void crypto_ablkcipher_clear_flags(struct crypto_ablkcipher *tfm,
static inline int crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm,
const u8 *key, unsigned int keylen)
{
- return crypto_ablkcipher_crt(tfm)->setkey(tfm, key, keylen);
+ struct ablkcipher_tfm *crt = crypto_ablkcipher_crt(tfm);
+
+ return crt->setkey(crt->base, key, keylen);
}
static inline struct crypto_ablkcipher *crypto_ablkcipher_reqtfm(
@@ -655,7 +665,7 @@ static inline unsigned int crypto_ablkcipher_reqsize(
static inline void ablkcipher_request_set_tfm(
struct ablkcipher_request *req, struct crypto_ablkcipher *tfm)
{
- req->base.tfm = crypto_ablkcipher_tfm(tfm);
+ req->base.tfm = crypto_ablkcipher_tfm(crypto_ablkcipher_crt(tfm)->base);
}
static inline struct ablkcipher_request *ablkcipher_request_cast(