diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index bf45917..8edf40c 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -349,13 +349,48 @@
 	return cipher->setkey(tfm, key, keylen);
 }
 
+static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+			unsigned int keylen)
+{
+	return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
+}
+
+static int async_encrypt(struct ablkcipher_request *req)
+{
+	struct crypto_tfm *tfm = req->base.tfm;
+	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
+	struct blkcipher_desc desc = {
+		.tfm = __crypto_blkcipher_cast(tfm),
+		.info = req->info,
+		.flags = req->base.flags,
+	};
+
+
+	return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
+}
+
+static int async_decrypt(struct ablkcipher_request *req)
+{
+	struct crypto_tfm *tfm = req->base.tfm;
+	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
+	struct blkcipher_desc desc = {
+		.tfm = __crypto_blkcipher_cast(tfm),
+		.info = req->info,
+		.flags = req->base.flags,
+	};
+
+	return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
+}
+
 static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
 					     u32 mask)
 {
 	struct blkcipher_alg *cipher = &alg->cra_blkcipher;
 	unsigned int len = alg->cra_ctxsize;
 
-	if (cipher->ivsize) {
+	type ^= CRYPTO_ALG_ASYNC;
+	mask &= CRYPTO_ALG_ASYNC;
+	if ((type & mask) && cipher->ivsize) {
 		len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
 		len += cipher->ivsize;
 	}
@@ -363,16 +398,26 @@
 	return len;
 }
 
-static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
+{
+	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
+	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
+
+	crt->setkey = async_setkey;
+	crt->encrypt = async_encrypt;
+	crt->decrypt = async_decrypt;
+	crt->ivsize = alg->ivsize;
+
+	return 0;
+}
+
+static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
 {
 	struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
 	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
 	unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
 	unsigned long addr;
 
-	if (alg->ivsize > PAGE_SIZE / 8)
-		return -EINVAL;
-
 	crt->setkey = setkey;
 	crt->encrypt = alg->encrypt;
 	crt->decrypt = alg->decrypt;
@@ -385,6 +430,21 @@
 	return 0;
 }
 
+static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
+
+	if (alg->ivsize > PAGE_SIZE / 8)
+		return -EINVAL;
+
+	type ^= CRYPTO_ALG_ASYNC;
+	mask &= CRYPTO_ALG_ASYNC;
+	if (type & mask)
+		return crypto_init_blkcipher_ops_sync(tfm);
+	else
+		return crypto_init_blkcipher_ops_async(tfm);
+}
+
 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
 	__attribute__ ((unused));
 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 779aa78..d4d0531 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -56,6 +56,7 @@
 
 #define CRYPTO_TFM_REQ_WEAK_KEY		0x00000100
 #define CRYPTO_TFM_REQ_MAY_SLEEP	0x00000200
+#define CRYPTO_TFM_REQ_MAY_BACKLOG	0x00000400
 #define CRYPTO_TFM_RES_WEAK_KEY		0x00100000
 #define CRYPTO_TFM_RES_BAD_KEY_LEN   	0x00200000
 #define CRYPTO_TFM_RES_BAD_KEY_SCHED 	0x00400000
@@ -88,11 +89,37 @@
 #endif
 
 struct scatterlist;
+struct crypto_ablkcipher;
+struct crypto_async_request;
 struct crypto_blkcipher;
 struct crypto_hash;
 struct crypto_tfm;
 struct crypto_type;
 
+typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);
+
+struct crypto_async_request {
+	struct list_head list;
+	crypto_completion_t complete;
+	void *data;
+	struct crypto_tfm *tfm;
+
+	u32 flags;
+};
+
+struct ablkcipher_request {
+	struct crypto_async_request base;
+
+	unsigned int nbytes;
+
+	void *info;
+
+	struct scatterlist *src;
+	struct scatterlist *dst;
+
+	void *__ctx[] CRYPTO_MINALIGN_ATTR;
+};
+
 struct blkcipher_desc {
 	struct crypto_blkcipher *tfm;
 	void *info;
@@ -232,6 +259,15 @@
  * crypto_free_*(), as well as the various helpers below.
  */
 
+struct ablkcipher_tfm {
+	int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
+	              unsigned int keylen);
+	int (*encrypt)(struct ablkcipher_request *req);
+	int (*decrypt)(struct ablkcipher_request *req);
+	unsigned int ivsize;
+	unsigned int reqsize;
+};
+
 struct blkcipher_tfm {
 	void *iv;
 	int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
@@ -290,6 +326,7 @@
 	                      u8 *dst, unsigned int *dlen);
 };
 
+#define crt_ablkcipher	crt_u.ablkcipher
 #define crt_blkcipher	crt_u.blkcipher
 #define crt_cipher	crt_u.cipher
 #define crt_hash	crt_u.hash
@@ -300,6 +337,7 @@
 	u32 crt_flags;
 	
 	union {
+		struct ablkcipher_tfm ablkcipher;
 		struct blkcipher_tfm blkcipher;
 		struct cipher_tfm cipher;
 		struct hash_tfm hash;
@@ -311,6 +349,10 @@
 	void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
 };
 
+struct crypto_ablkcipher {
+	struct crypto_tfm base;
+};
+
 struct crypto_blkcipher {
 	struct crypto_tfm base;
 };
@@ -411,6 +453,155 @@
 /*
  * API wrappers.
  */
+static inline struct crypto_ablkcipher *__crypto_ablkcipher_cast(
+	struct crypto_tfm *tfm)
+{
+	return (struct crypto_ablkcipher *)tfm;
+}
+
+static inline struct crypto_ablkcipher *crypto_alloc_ablkcipher(
+	const char *alg_name, u32 type, u32 mask)
+{
+	type &= ~CRYPTO_ALG_TYPE_MASK;
+	type |= CRYPTO_ALG_TYPE_BLKCIPHER;
+	mask |= CRYPTO_ALG_TYPE_MASK;
+
+	return __crypto_ablkcipher_cast(
+		crypto_alloc_base(alg_name, type, mask));
+}
+
+static inline struct crypto_tfm *crypto_ablkcipher_tfm(
+	struct crypto_ablkcipher *tfm)
+{
+	return &tfm->base;
+}
+
+static inline void crypto_free_ablkcipher(struct crypto_ablkcipher *tfm)
+{
+	crypto_free_tfm(crypto_ablkcipher_tfm(tfm));
+}
+
+static inline int crypto_has_ablkcipher(const char *alg_name, u32 type,
+					u32 mask)
+{
+	type &= ~CRYPTO_ALG_TYPE_MASK;
+	type |= CRYPTO_ALG_TYPE_BLKCIPHER;
+	mask |= CRYPTO_ALG_TYPE_MASK;
+
+	return crypto_has_alg(alg_name, type, mask);
+}
+
+static inline struct ablkcipher_tfm *crypto_ablkcipher_crt(
+	struct crypto_ablkcipher *tfm)
+{
+	return &crypto_ablkcipher_tfm(tfm)->crt_ablkcipher;
+}
+
+static inline unsigned int crypto_ablkcipher_ivsize(
+	struct crypto_ablkcipher *tfm)
+{
+	return crypto_ablkcipher_crt(tfm)->ivsize;
+}
+
+static inline unsigned int crypto_ablkcipher_blocksize(
+	struct crypto_ablkcipher *tfm)
+{
+	return crypto_tfm_alg_blocksize(crypto_ablkcipher_tfm(tfm));
+}
+
+static inline unsigned int crypto_ablkcipher_alignmask(
+	struct crypto_ablkcipher *tfm)
+{
+	return crypto_tfm_alg_alignmask(crypto_ablkcipher_tfm(tfm));
+}
+
+static inline u32 crypto_ablkcipher_get_flags(struct crypto_ablkcipher *tfm)
+{
+	return crypto_tfm_get_flags(crypto_ablkcipher_tfm(tfm));
+}
+
+static inline void crypto_ablkcipher_set_flags(struct crypto_ablkcipher *tfm,
+					       u32 flags)
+{
+	crypto_tfm_set_flags(crypto_ablkcipher_tfm(tfm), flags);
+}
+
+static inline void crypto_ablkcipher_clear_flags(struct crypto_ablkcipher *tfm,
+						 u32 flags)
+{
+	crypto_tfm_clear_flags(crypto_ablkcipher_tfm(tfm), flags);
+}
+
+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);
+}
+
+static inline struct crypto_ablkcipher *crypto_ablkcipher_reqtfm(
+	struct ablkcipher_request *req)
+{
+	return __crypto_ablkcipher_cast(req->base.tfm);
+}
+
+static inline int crypto_ablkcipher_encrypt(struct ablkcipher_request *req)
+{
+	struct ablkcipher_tfm *crt =
+		crypto_ablkcipher_crt(crypto_ablkcipher_reqtfm(req));
+	return crt->encrypt(req);
+}
+
+static inline int crypto_ablkcipher_decrypt(struct ablkcipher_request *req)
+{
+	struct ablkcipher_tfm *crt =
+		crypto_ablkcipher_crt(crypto_ablkcipher_reqtfm(req));
+	return crt->decrypt(req);
+}
+
+static inline int crypto_ablkcipher_reqsize(struct crypto_ablkcipher *tfm)
+{
+	return crypto_ablkcipher_crt(tfm)->reqsize;
+}
+
+static inline struct ablkcipher_request *ablkcipher_request_alloc(
+	struct crypto_ablkcipher *tfm, gfp_t gfp)
+{
+	struct ablkcipher_request *req;
+
+	req = kmalloc(sizeof(struct ablkcipher_request) +
+		      crypto_ablkcipher_reqsize(tfm), gfp);
+
+	if (likely(req))
+		req->base.tfm = crypto_ablkcipher_tfm(tfm);
+
+	return req;
+}
+
+static inline void ablkcipher_request_free(struct ablkcipher_request *req)
+{
+	kfree(req);
+}
+
+static inline void ablkcipher_request_set_callback(
+	struct ablkcipher_request *req,
+	u32 flags, crypto_completion_t complete, void *data)
+{
+	req->base.complete = complete;
+	req->base.data = data;
+	req->base.flags = flags;
+}
+
+static inline void ablkcipher_request_set_crypt(
+	struct ablkcipher_request *req,
+	struct scatterlist *src, struct scatterlist *dst,
+	unsigned int nbytes, void *iv)
+{
+	req->src = src;
+	req->dst = dst;
+	req->nbytes = nbytes;
+	req->info = iv;
+}
+
 static inline struct crypto_blkcipher *__crypto_blkcipher_cast(
 	struct crypto_tfm *tfm)
 {
@@ -427,9 +618,9 @@
 static inline struct crypto_blkcipher *crypto_alloc_blkcipher(
 	const char *alg_name, u32 type, u32 mask)
 {
-	type &= ~CRYPTO_ALG_TYPE_MASK;
+	type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 	type |= CRYPTO_ALG_TYPE_BLKCIPHER;
-	mask |= CRYPTO_ALG_TYPE_MASK;
+	mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC;
 
 	return __crypto_blkcipher_cast(crypto_alloc_base(alg_name, type, mask));
 }
@@ -447,9 +638,9 @@
 
 static inline int crypto_has_blkcipher(const char *alg_name, u32 type, u32 mask)
 {
-	type &= ~CRYPTO_ALG_TYPE_MASK;
+	type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 	type |= CRYPTO_ALG_TYPE_BLKCIPHER;
-	mask |= CRYPTO_ALG_TYPE_MASK;
+	mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC;
 
 	return crypto_has_alg(alg_name, type, mask);
 }