[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>
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index c9402dd..07e7c82 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 @@
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 facafa1..fa7afa9 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 @@
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 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 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 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(