[CRYPTO] hash: Add asynchronous hash support

This patch adds asynchronous hash and digest support.

Signed-off-by: Loc Ho <lho@amcc.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

8 files changed, 507 insertions, 15 deletions

diff --git a/crypto/Makefile b/crypto/Makefile
index 807656b64e02..d4f3ed857df0 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_CRYPTO_BLKCIPHER) += crypto_blkcipher.o
 obj-$(CONFIG_CRYPTO_SEQIV) += seqiv.o
 
 crypto_hash-objs := hash.o
+crypto_hash-objs += ahash.o
 obj-$(CONFIG_CRYPTO_HASH) += crypto_hash.o
 
 obj-$(CONFIG_CRYPTO_MANAGER) += cryptomgr.o
diff --git a/crypto/ahash.c b/crypto/ahash.c
new file mode 100644
index 000000000000..a83e035d9a3f
--- /dev/null
+++ b/crypto/ahash.c
@@ -0,0 +1,106 @@
+/*
+ * Asynchronous Cryptographic Hash operations.
+ *
+ * This is the asynchronous version of hash.c with notification of
+ * completion via a callback.
+ *
+ * Copyright (c) 2008 Loc Ho <lho@amcc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <crypto/algapi.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+
+#include "internal.h"
+
+static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
+                                unsigned int keylen)
+{
+        struct ahash_alg *ahash = crypto_ahash_alg(tfm);
+        unsigned long alignmask = crypto_ahash_alignmask(tfm);
+        int ret;
+        u8 *buffer, *alignbuffer;
+        unsigned long absize;
+
+        absize = keylen + alignmask;
+        buffer = kmalloc(absize, GFP_ATOMIC);
+        if (!buffer)
+                return -ENOMEM;
+
+        alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
+        memcpy(alignbuffer, key, keylen);
+        ret = ahash->setkey(tfm, alignbuffer, keylen);
+        memset(alignbuffer, 0, keylen);
+        kfree(buffer);
+        return ret;
+}
+
+static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
+                        unsigned int keylen)
+{
+        struct ahash_alg *ahash = crypto_ahash_alg(tfm);
+        unsigned long alignmask = crypto_ahash_alignmask(tfm);
+
+        if ((unsigned long)key & alignmask)
+                return ahash_setkey_unaligned(tfm, key, keylen);
+
+        return ahash->setkey(tfm, key, keylen);
+}
+
+static unsigned int crypto_ahash_ctxsize(struct crypto_alg *alg, u32 type,
+                                        u32 mask)
+{
+        return alg->cra_ctxsize;
+}
+
+static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+        struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash;
+        struct ahash_tfm *crt   = &tfm->crt_ahash;
+
+        if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
+                return -EINVAL;
+
+        crt->init = alg->init;
+        crt->update = alg->update;
+        crt->final  = alg->final;
+        crt->digest = alg->digest;
+        crt->setkey = ahash_setkey;
+        crt->base   = __crypto_ahash_cast(tfm);
+        crt->digestsize = alg->digestsize;
+
+        return 0;
+}
+
+static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
+        __attribute__ ((unused));
+static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
+{
+        seq_printf(m, "type         : ahash\n");
+        seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
+                                             "yes" : "no");
+        seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
+        seq_printf(m, "digestsize   : %u\n", alg->cra_hash.digestsize);
+}
+
+const struct crypto_type crypto_ahash_type = {
+        .ctxsize = crypto_ahash_ctxsize,
+        .init = crypto_init_ahash_ops,
+#ifdef CONFIG_PROC_FS
+        .show = crypto_ahash_show,
+#endif
+};
+EXPORT_SYMBOL_GPL(crypto_ahash_type);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
diff --git a/crypto/api.c b/crypto/api.c
index 0a0f41ef255f..d06e33270abe 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -235,8 +235,12 @@ static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
                 return crypto_init_cipher_ops(tfm);
                 
         case CRYPTO_ALG_TYPE_DIGEST:
-                return crypto_init_digest_ops(tfm);
-                
+                if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) !=
+                    CRYPTO_ALG_TYPE_HASH_MASK)
+                        return crypto_init_digest_ops_async(tfm);
+                else
+                        return crypto_init_digest_ops(tfm);
+
         case CRYPTO_ALG_TYPE_COMPRESS:
                 return crypto_init_compress_ops(tfm);
         
diff --git a/crypto/digest.c b/crypto/digest.c
index b526cc348b79..025c9aea24ed 100644
--- a/crypto/digest.c
+++ b/crypto/digest.c
@@ -157,3 +157,84 @@ int crypto_init_digest_ops(struct crypto_tfm *tfm)
 void crypto_exit_digest_ops(struct crypto_tfm *tfm)
 {
 }
+
+static int digest_async_nosetkey(struct crypto_ahash *tfm_async, const u8 *key,
+                        unsigned int keylen)
+{
+        crypto_ahash_clear_flags(tfm_async, CRYPTO_TFM_RES_MASK);
+        return -ENOSYS;
+}
+
+static int digest_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
+                        unsigned int keylen)
+{
+        struct crypto_tfm    *tfm        = crypto_ahash_tfm(tfm_async);
+        struct digest_alg    *dalg       = &tfm->__crt_alg->cra_digest;
+
+        crypto_ahash_clear_flags(tfm_async, CRYPTO_TFM_RES_MASK);
+        return dalg->dia_setkey(tfm, key, keylen);
+}
+
+static int digest_async_init(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm  = req->base.tfm;
+        struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
+
+        dalg->dia_init(tfm);
+        return 0;
+}
+
+static int digest_async_update(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm = req->base.tfm;
+        struct hash_desc  desc = {
+                .tfm   = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        update(&desc, req->src, req->nbytes);
+        return 0;
+}
+
+static int digest_async_final(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm  = req->base.tfm;
+        struct hash_desc  desc = {
+                .tfm   = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        final(&desc, req->result);
+        return 0;
+}
+
+static int digest_async_digest(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm  = req->base.tfm;
+        struct hash_desc  desc = {
+                .tfm   = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        return digest(&desc, req->src, req->nbytes, req->result);
+}
+
+int crypto_init_digest_ops_async(struct crypto_tfm *tfm)
+{
+        struct ahash_tfm  *crt  = &tfm->crt_ahash;
+        struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
+
+        if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
+                return -EINVAL;
+
+        crt->init       = digest_async_init;
+        crt->update     = digest_async_update;
+        crt->final      = digest_async_final;
+        crt->digest     = digest_async_digest;
+        crt->setkey     = dalg->dia_setkey ? digest_async_setkey :
+                                                digest_async_nosetkey;
+        crt->digestsize = dalg->dia_digestsize;
+        crt->base       = __crypto_ahash_cast(tfm);
+
+        return 0;
+}
diff --git a/crypto/hash.c b/crypto/hash.c
index 7dcff671c19b..f9400a014e74 100644
--- a/crypto/hash.c
+++ b/crypto/hash.c
@@ -59,24 +59,108 @@ static int hash_setkey(struct crypto_hash *crt, const u8 *key,
         return alg->setkey(crt, key, keylen);
 }
 
-static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+static int hash_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
+                        unsigned int keylen)
+{
+        struct crypto_tfm  *tfm      = crypto_ahash_tfm(tfm_async);
+        struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm);
+        struct hash_alg    *alg      = &tfm->__crt_alg->cra_hash;
+
+        return alg->setkey(tfm_hash, key, keylen);
+}
+
+static int hash_async_init(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm = req->base.tfm;
+        struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
+        struct hash_desc  desc = {
+                .tfm = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        return alg->init(&desc);
+}
+
+static int hash_async_update(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm = req->base.tfm;
+        struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
+        struct hash_desc  desc = {
+                .tfm = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        return alg->update(&desc, req->src, req->nbytes);
+}
+
+static int hash_async_final(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm = req->base.tfm;
+        struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
+        struct hash_desc  desc = {
+                .tfm = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        return alg->final(&desc, req->result);
+}
+
+static int hash_async_digest(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm = req->base.tfm;
+        struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
+        struct hash_desc  desc = {
+                .tfm = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        return alg->digest(&desc, req->src, req->nbytes, req->result);
+}
+
+static int crypto_init_hash_ops_async(struct crypto_tfm *tfm)
+{
+        struct ahash_tfm *crt = &tfm->crt_ahash;
+        struct hash_alg  *alg = &tfm->__crt_alg->cra_hash;
+
+        crt->init       = hash_async_init;
+        crt->update     = hash_async_update;
+        crt->final      = hash_async_final;
+        crt->digest     = hash_async_digest;
+        crt->setkey     = hash_async_setkey;
+        crt->digestsize = alg->digestsize;
+        crt->base       = __crypto_ahash_cast(tfm);
+
+        return 0;
+}
+
+static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm)
 {
         struct hash_tfm *crt = &tfm->crt_hash;
         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
 
-        if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
-                return -EINVAL;
-
-        crt->init = alg->init;
-        crt->update = alg->update;
-        crt->final = alg->final;
-        crt->digest = alg->digest;
-        crt->setkey = hash_setkey;
+        crt->init       = alg->init;
+        crt->update     = alg->update;
+        crt->final      = alg->final;
+        crt->digest     = alg->digest;
+        crt->setkey     = hash_setkey;
         crt->digestsize = alg->digestsize;
 
         return 0;
 }
 
+static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+        struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
+
+        if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
+                return -EINVAL;
+
+        if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK)
+                return crypto_init_hash_ops_async(tfm);
+        else
+                return crypto_init_hash_ops_sync(tfm);
+}
+
 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
         __attribute__ ((unused));
 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
diff --git a/crypto/internal.h b/crypto/internal.h
index 32f4c2145603..683fcb2d91f4 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -86,6 +86,7 @@ struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask);
 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
 
 int crypto_init_digest_ops(struct crypto_tfm *tfm);
+int crypto_init_digest_ops_async(struct crypto_tfm *tfm);
 int crypto_init_cipher_ops(struct crypto_tfm *tfm);
 int crypto_init_compress_ops(struct crypto_tfm *tfm);
 
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 60d06e784be3..fef272a8ceeb 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -98,6 +98,7 @@ extern const struct crypto_type crypto_ablkcipher_type;
 extern const struct crypto_type crypto_aead_type;
 extern const struct crypto_type crypto_blkcipher_type;
 extern const struct crypto_type crypto_hash_type;
+extern const struct crypto_type crypto_ahash_type;
 
 void crypto_mod_put(struct crypto_alg *alg);
 
@@ -314,5 +315,40 @@ static inline int crypto_requires_sync(u32 type, u32 mask)
         return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
 }
 
+static inline void *crypto_ahash_ctx(struct crypto_ahash *tfm)
+{
+        return crypto_tfm_ctx(&tfm->base);
+}
+
+static inline struct ahash_alg *crypto_ahash_alg(
+        struct crypto_ahash *tfm)
+{
+        return &crypto_ahash_tfm(tfm)->__crt_alg->cra_ahash;
+}
+
+static inline int ahash_enqueue_request(struct crypto_queue *queue,
+                                             struct ahash_request *request)
+{
+        return crypto_enqueue_request(queue, &request->base);
+}
+
+static inline struct ahash_request *ahash_dequeue_request(
+        struct crypto_queue *queue)
+{
+        return ahash_request_cast(crypto_dequeue_request(queue));
+}
+
+static inline void *ahash_request_ctx(struct ahash_request *req)
+{
+        return req->__ctx;
+}
+
+static inline int ahash_tfm_in_queue(struct crypto_queue *queue,
+                                          struct crypto_ahash *tfm)
+{
+        return crypto_tfm_in_queue(queue, crypto_ahash_tfm(tfm));
+}
+
+
 #endif  /* _CRYPTO_ALGAPI_H */
 
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 425824bd49f3..b6efe569128d 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -30,15 +30,17 @@
  */
 #define CRYPTO_ALG_TYPE_MASK            0x0000000f
 #define CRYPTO_ALG_TYPE_CIPHER          0x00000001
-#define CRYPTO_ALG_TYPE_DIGEST          0x00000002
-#define CRYPTO_ALG_TYPE_HASH            0x00000003
+#define CRYPTO_ALG_TYPE_COMPRESS        0x00000002
+#define CRYPTO_ALG_TYPE_AEAD            0x00000003
 #define CRYPTO_ALG_TYPE_BLKCIPHER       0x00000004
 #define CRYPTO_ALG_TYPE_ABLKCIPHER      0x00000005
 #define CRYPTO_ALG_TYPE_GIVCIPHER       0x00000006
-#define CRYPTO_ALG_TYPE_COMPRESS        0x00000008
-#define CRYPTO_ALG_TYPE_AEAD            0x00000009
+#define CRYPTO_ALG_TYPE_DIGEST          0x00000008
+#define CRYPTO_ALG_TYPE_HASH            0x00000009
+#define CRYPTO_ALG_TYPE_AHASH           0x0000000a
 
 #define CRYPTO_ALG_TYPE_HASH_MASK       0x0000000e
+#define CRYPTO_ALG_TYPE_AHASH_MASK      0x0000000c
 #define CRYPTO_ALG_TYPE_BLKCIPHER_MASK  0x0000000c
 
 #define CRYPTO_ALG_LARVAL               0x00000010
@@ -102,6 +104,7 @@ struct crypto_async_request;
 struct crypto_aead;
 struct crypto_blkcipher;
 struct crypto_hash;
+struct crypto_ahash;
 struct crypto_tfm;
 struct crypto_type;
 struct aead_givcrypt_request;
@@ -131,6 +134,18 @@ struct ablkcipher_request {
         void *__ctx[] CRYPTO_MINALIGN_ATTR;
 };
 
+struct ahash_request {
+        struct crypto_async_request base;
+
+        void *info;
+
+        unsigned int nbytes;
+        struct scatterlist *src;
+        u8                 *result;
+
+        void *__ctx[] CRYPTO_MINALIGN_ATTR;
+};
+
 /**
  *      struct aead_request - AEAD request
  *      @base: Common attributes for async crypto requests
@@ -195,6 +210,17 @@ struct ablkcipher_alg {
         unsigned int ivsize;
 };
 
+struct ahash_alg {
+        int (*init)(struct ahash_request *req);
+        int (*update)(struct ahash_request *req);
+        int (*final)(struct ahash_request *req);
+        int (*digest)(struct ahash_request *req);
+        int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
+                        unsigned int keylen);
+
+        unsigned int digestsize;
+};
+
 struct aead_alg {
         int (*setkey)(struct crypto_aead *tfm, const u8 *key,
                       unsigned int keylen);
@@ -272,6 +298,7 @@ struct compress_alg {
 #define cra_cipher      cra_u.cipher
 #define cra_digest      cra_u.digest
 #define cra_hash        cra_u.hash
+#define cra_ahash       cra_u.ahash
 #define cra_compress    cra_u.compress
 
 struct crypto_alg {
@@ -298,6 +325,7 @@ struct crypto_alg {
                 struct cipher_alg cipher;
                 struct digest_alg digest;
                 struct hash_alg hash;
+                struct ahash_alg ahash;
                 struct compress_alg compress;
         } cra_u;
 
@@ -383,6 +411,19 @@ struct hash_tfm {
         unsigned int digestsize;
 };
 
+struct ahash_tfm {
+        int (*init)(struct ahash_request *req);
+        int (*update)(struct ahash_request *req);
+        int (*final)(struct ahash_request *req);
+        int (*digest)(struct ahash_request *req);
+        int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
+                        unsigned int keylen);
+
+        unsigned int digestsize;
+        struct crypto_ahash *base;
+        unsigned int reqsize;
+};
+
 struct compress_tfm {
         int (*cot_compress)(struct crypto_tfm *tfm,
                             const u8 *src, unsigned int slen,
@@ -397,6 +438,7 @@ struct compress_tfm {
 #define crt_blkcipher   crt_u.blkcipher
 #define crt_cipher      crt_u.cipher
 #define crt_hash        crt_u.hash
+#define crt_ahash       crt_u.ahash
 #define crt_compress    crt_u.compress
 
 struct crypto_tfm {
@@ -409,6 +451,7 @@ struct crypto_tfm {
                 struct blkcipher_tfm blkcipher;
                 struct cipher_tfm cipher;
                 struct hash_tfm hash;
+                struct ahash_tfm ahash;
                 struct compress_tfm compress;
         } crt_u;
         
@@ -441,6 +484,10 @@ struct crypto_hash {
         struct crypto_tfm base;
 };
 
+struct crypto_ahash {
+        struct crypto_tfm base;
+};
+
 enum {
         CRYPTOA_UNSPEC,
         CRYPTOA_ALG,
@@ -1264,5 +1311,137 @@ static inline int crypto_comp_decompress(struct crypto_comp *tfm,
                                                     src, slen, dst, dlen);
 }
 
+static inline struct crypto_ahash *__crypto_ahash_cast(struct crypto_tfm *tfm)
+{
+        return (struct crypto_ahash *)tfm;
+}
+
+static inline struct crypto_ahash *crypto_alloc_ahash(const char *alg_name,
+                                                      u32 type, u32 mask)
+{
+        type &= ~CRYPTO_ALG_TYPE_MASK;
+        mask &= ~CRYPTO_ALG_TYPE_MASK;
+        type |= CRYPTO_ALG_TYPE_AHASH;
+        mask |= CRYPTO_ALG_TYPE_AHASH_MASK;
+
+        return __crypto_ahash_cast(crypto_alloc_base(alg_name, type, mask));
+}
+
+static inline struct crypto_tfm *crypto_ahash_tfm(struct crypto_ahash *tfm)
+{
+        return &tfm->base;
+}
+
+static inline void crypto_free_ahash(struct crypto_ahash *tfm)
+{
+        crypto_free_tfm(crypto_ahash_tfm(tfm));
+}
+
+static inline unsigned int crypto_ahash_alignmask(
+        struct crypto_ahash *tfm)
+{
+        return crypto_tfm_alg_alignmask(crypto_ahash_tfm(tfm));
+}
+
+static inline struct ahash_tfm *crypto_ahash_crt(struct crypto_ahash *tfm)
+{
+        return &crypto_ahash_tfm(tfm)->crt_ahash;
+}
+
+static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm)
+{
+        return crypto_ahash_crt(tfm)->digestsize;
+}
+
+static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm)
+{
+        return crypto_tfm_get_flags(crypto_ahash_tfm(tfm));
+}
+
+static inline void crypto_ahash_set_flags(struct crypto_ahash *tfm, u32 flags)
+{
+        crypto_tfm_set_flags(crypto_ahash_tfm(tfm), flags);
+}
+
+static inline void crypto_ahash_clear_flags(struct crypto_ahash *tfm, u32 flags)
+{
+        crypto_tfm_clear_flags(crypto_ahash_tfm(tfm), flags);
+}
+
+static inline struct crypto_ahash *crypto_ahash_reqtfm(
+        struct ahash_request *req)
+{
+        return __crypto_ahash_cast(req->base.tfm);
+}
+
+static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm)
+{
+        return crypto_ahash_crt(tfm)->reqsize;
+}
+
+static inline int crypto_ahash_setkey(struct crypto_ahash *tfm,
+                                      const u8 *key, unsigned int keylen)
+{
+        struct ahash_tfm *crt = crypto_ahash_crt(tfm);
+
+        return crt->setkey(crt->base, key, keylen);
+}
+
+static inline int crypto_ahash_digest(struct ahash_request *req)
+{
+        struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
+        return crt->digest(req);
+}
+
+static inline void ahash_request_set_tfm(struct ahash_request *req,
+                                         struct crypto_ahash *tfm)
+{
+        req->base.tfm = crypto_ahash_tfm(crypto_ahash_crt(tfm)->base);
+}
+
+static inline struct ahash_request *ahash_request_alloc(
+        struct crypto_ahash *tfm, gfp_t gfp)
+{
+        struct ahash_request *req;
+
+        req = kmalloc(sizeof(struct ahash_request) +
+                      crypto_ahash_reqsize(tfm), gfp);
+
+        if (likely(req))
+                ahash_request_set_tfm(req, tfm);
+
+        return req;
+}
+
+static inline void ahash_request_free(struct ahash_request *req)
+{
+        kfree(req);
+}
+
+static inline struct ahash_request *ahash_request_cast(
+        struct crypto_async_request *req)
+{
+        return container_of(req, struct ahash_request, base);
+}
+
+static inline void ahash_request_set_callback(struct ahash_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 ahash_request_set_crypt(struct ahash_request *req,
+                                           struct scatterlist *src, u8 *result,
+                                           unsigned int nbytes)
+{
+        req->src = src;
+        req->nbytes = nbytes;
+        req->result = result;
+}
+
 #endif  /* _LINUX_CRYPTO_H */