[CRYPTO] Add support for low-level multi-block operations

This patch adds hooks for cipher algorithms to implement multi-block
ECB/CBC operations directly.  This is expected to provide significant
performance boots to the VIA Padlock.

It could also be used for improving software implementations such as
AES where operating on multiple blocks at a time may enable certain
optimisations.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 27 insertions, 1 deletions

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 387da6a3e58c..26ce01c25745 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -61,6 +61,15 @@
 #define CRYPTO_DIR_DECRYPT              0
 
 struct scatterlist;
+struct crypto_tfm;
+
+struct cipher_desc {
+        struct crypto_tfm *tfm;
+        void (*crfn)(void *ctx, u8 *dst, const u8 *src);
+        unsigned int (*prfn)(const struct cipher_desc *desc, u8 *dst,
+                             const u8 *src, unsigned int nbytes);
+        void *info;
+};
 
 /*
  * Algorithms: modular crypto algorithm implementations, managed
@@ -73,6 +82,19 @@ struct cipher_alg {
                           unsigned int keylen, u32 *flags);
         void (*cia_encrypt)(void *ctx, u8 *dst, const u8 *src);
         void (*cia_decrypt)(void *ctx, u8 *dst, const u8 *src);
+
+        unsigned int (*cia_encrypt_ecb)(const struct cipher_desc *desc,
+                                        u8 *dst, const u8 *src,
+                                        unsigned int nbytes);
+        unsigned int (*cia_decrypt_ecb)(const struct cipher_desc *desc,
+                                        u8 *dst, const u8 *src,
+                                        unsigned int nbytes);
+        unsigned int (*cia_encrypt_cbc)(const struct cipher_desc *desc,
+                                        u8 *dst, const u8 *src,
+                                        unsigned int nbytes);
+        unsigned int (*cia_decrypt_cbc)(const struct cipher_desc *desc,
+                                        u8 *dst, const u8 *src,
+                                        unsigned int nbytes);
 };
 
 struct digest_alg {
@@ -136,7 +158,6 @@ static inline int crypto_alg_available(const char *name, u32 flags)
  * and core processing logic.  Managed via crypto_alloc_tfm() and
  * crypto_free_tfm(), as well as the various helpers below.
  */
-struct crypto_tfm;
 
 struct cipher_tfm {
         void *cit_iv;
@@ -266,6 +287,11 @@ static inline unsigned int crypto_tfm_alg_digestsize(struct crypto_tfm *tfm)
         return tfm->__crt_alg->cra_digest.dia_digestsize;
 }
 
+static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
+{
+        return (void *)&tfm[1];
+}
+
 /*
  * API wrappers.
  */