[CRYPTO] api: Add async blkcipher type

This patch adds the mid-level interface for asynchronous block ciphers.
It also includes a generic queueing mechanism that can be used by other
asynchronous crypto operations in future.

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

1 files changed, 22 insertions, 0 deletions

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 67830e7c2c31..0ec2467891db 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -93,6 +93,7 @@ struct crypto_ablkcipher;
 struct crypto_async_request;
 struct crypto_blkcipher;
 struct crypto_hash;
+struct crypto_queue;
 struct crypto_tfm;
 struct crypto_type;
 
@@ -143,6 +144,19 @@ struct hash_desc {
  * Algorithms: modular crypto algorithm implementations, managed
  * via crypto_register_alg() and crypto_unregister_alg().
  */
+struct ablkcipher_alg {
+        int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
+                      unsigned int keylen);
+        int (*encrypt)(struct ablkcipher_request *req);
+        int (*decrypt)(struct ablkcipher_request *req);
+
+        struct crypto_queue *queue;
+
+        unsigned int min_keysize;
+        unsigned int max_keysize;
+        unsigned int ivsize;
+};
+
 struct blkcipher_alg {
         int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
                       unsigned int keylen);
@@ -197,6 +211,7 @@ struct compress_alg {
                               unsigned int slen, u8 *dst, unsigned int *dlen);
 };
 
+#define cra_ablkcipher  cra_u.ablkcipher
 #define cra_blkcipher   cra_u.blkcipher
 #define cra_cipher      cra_u.cipher
 #define cra_digest      cra_u.digest
@@ -221,6 +236,7 @@ struct crypto_alg {
         const struct crypto_type *cra_type;
 
         union {
+                struct ablkcipher_alg ablkcipher;
                 struct blkcipher_alg blkcipher;
                 struct cipher_alg cipher;
                 struct digest_alg digest;
@@ -572,6 +588,12 @@ static inline int crypto_ablkcipher_reqsize(struct crypto_ablkcipher *tfm)
         return crypto_ablkcipher_crt(tfm)->reqsize;
 }
 
+static inline struct ablkcipher_request *ablkcipher_request_cast(
+        struct crypto_async_request *req)
+{
+        return container_of(req, struct ablkcipher_request, base);
+}
+
 static inline struct ablkcipher_request *ablkcipher_request_alloc(
         struct crypto_ablkcipher *tfm, gfp_t gfp)
 {