crypto: cryptd - Use shash algorithms
Herbert Xu [Sun, 12 Jul 2009 13:38:59 +0000 (21:38 +0800)]
This patch changes cryptd to use shash algorithms instead of the
legacy hash interface.

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

crypto/cryptd.c

index ae5fa99..ef5720c 100644 (file)
@@ -39,6 +39,11 @@ struct cryptd_instance_ctx {
        struct cryptd_queue *queue;
 };
 
+struct hashd_instance_ctx {
+       struct crypto_shash_spawn spawn;
+       struct cryptd_queue *queue;
+};
+
 struct cryptd_blkcipher_ctx {
        struct crypto_blkcipher *child;
 };
@@ -48,11 +53,12 @@ struct cryptd_blkcipher_request_ctx {
 };
 
 struct cryptd_hash_ctx {
-       struct crypto_hash *child;
+       struct crypto_shash *child;
 };
 
 struct cryptd_hash_request_ctx {
        crypto_completion_t complete;
+       struct shash_desc desc;
 };
 
 static void cryptd_queue_worker(struct work_struct *work);
@@ -250,13 +256,12 @@ static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
 }
 
 static struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
-                                                    struct cryptd_queue *queue)
+                                                    unsigned int tail)
 {
        struct crypto_instance *inst;
-       struct cryptd_instance_ctx *ctx;
        int err;
 
-       inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
+       inst = kzalloc(sizeof(*inst) + tail, GFP_KERNEL);
        if (!inst) {
                inst = ERR_PTR(-ENOMEM);
                goto out;
@@ -267,14 +272,6 @@ static struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
                     "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
                goto out_free_inst;
 
-       ctx = crypto_instance_ctx(inst);
-       err = crypto_init_spawn(&ctx->spawn, alg, inst,
-                               CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
-       if (err)
-               goto out_free_inst;
-
-       ctx->queue = queue;
-
        memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 
        inst->alg.cra_priority = alg->cra_priority + 50;
@@ -293,18 +290,28 @@ out_free_inst:
 static struct crypto_instance *cryptd_alloc_blkcipher(
        struct rtattr **tb, struct cryptd_queue *queue)
 {
+       struct cryptd_instance_ctx *ctx;
        struct crypto_instance *inst;
        struct crypto_alg *alg;
+       int err;
 
        alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
                                  CRYPTO_ALG_TYPE_MASK);
        if (IS_ERR(alg))
                return ERR_CAST(alg);
 
-       inst = cryptd_alloc_instance(alg, queue);
+       inst = cryptd_alloc_instance(alg, sizeof(*ctx));
        if (IS_ERR(inst))
                goto out_put_alg;
 
+       ctx = crypto_instance_ctx(inst);
+       ctx->queue = queue;
+
+       err = crypto_init_spawn(&ctx->spawn, alg, inst,
+                               CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
+       if (err)
+               goto out_free_inst;
+
        inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
        inst->alg.cra_type = &crypto_ablkcipher_type;
 
@@ -326,23 +333,28 @@ static struct crypto_instance *cryptd_alloc_blkcipher(
 out_put_alg:
        crypto_mod_put(alg);
        return inst;
+
+out_free_inst:
+       kfree(inst);
+       inst = ERR_PTR(err);
+       goto out_put_alg;
 }
 
 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 {
        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
-       struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
-       struct crypto_spawn *spawn = &ictx->spawn;
+       struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
+       struct crypto_shash_spawn *spawn = &ictx->spawn;
        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
-       struct crypto_hash *cipher;
+       struct crypto_shash *hash;
 
-       cipher = crypto_spawn_hash(spawn);
-       if (IS_ERR(cipher))
-               return PTR_ERR(cipher);
+       hash = crypto_spawn_shash(spawn);
+       if (IS_ERR(hash))
+               return PTR_ERR(hash);
 
-       ctx->child = cipher;
-       tfm->crt_ahash.reqsize =
-               sizeof(struct cryptd_hash_request_ctx);
+       ctx->child = hash;
+       tfm->crt_ahash.reqsize = sizeof(struct cryptd_hash_request_ctx) +
+                                crypto_shash_descsize(hash);
        return 0;
 }
 
@@ -350,22 +362,22 @@ static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 {
        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 
-       crypto_free_hash(ctx->child);
+       crypto_free_shash(ctx->child);
 }
 
 static int cryptd_hash_setkey(struct crypto_ahash *parent,
                                   const u8 *key, unsigned int keylen)
 {
        struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
-       struct crypto_hash     *child = ctx->child;
+       struct crypto_shash *child = ctx->child;
        int err;
 
-       crypto_hash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
-       crypto_hash_set_flags(child, crypto_ahash_get_flags(parent) &
-                                         CRYPTO_TFM_REQ_MASK);
-       err = crypto_hash_setkey(child, key, keylen);
-       crypto_ahash_set_flags(parent, crypto_hash_get_flags(child) &
-                                           CRYPTO_TFM_RES_MASK);
+       crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+       crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
+                                     CRYPTO_TFM_REQ_MASK);
+       err = crypto_shash_setkey(child, key, keylen);
+       crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
+                                      CRYPTO_TFM_RES_MASK);
        return err;
 }
 
@@ -385,21 +397,19 @@ static int cryptd_hash_enqueue(struct ahash_request *req,
 
 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 {
-       struct cryptd_hash_ctx *ctx   = crypto_tfm_ctx(req_async->tfm);
-       struct crypto_hash     *child = ctx->child;
-       struct ahash_request    *req = ahash_request_cast(req_async);
-       struct cryptd_hash_request_ctx *rctx;
-       struct hash_desc desc;
-
-       rctx = ahash_request_ctx(req);
+       struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
+       struct crypto_shash *child = ctx->child;
+       struct ahash_request *req = ahash_request_cast(req_async);
+       struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+       struct shash_desc *desc = &rctx->desc;
 
        if (unlikely(err == -EINPROGRESS))
                goto out;
 
-       desc.tfm = child;
-       desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+       desc->tfm = child;
+       desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       err = crypto_hash_crt(child)->init(&desc);
+       err = crypto_shash_init(desc);
 
        req->base.complete = rctx->complete;
 
@@ -416,23 +426,15 @@ static int cryptd_hash_init_enqueue(struct ahash_request *req)
 
 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 {
-       struct cryptd_hash_ctx *ctx   = crypto_tfm_ctx(req_async->tfm);
-       struct crypto_hash     *child = ctx->child;
-       struct ahash_request    *req = ahash_request_cast(req_async);
+       struct ahash_request *req = ahash_request_cast(req_async);
        struct cryptd_hash_request_ctx *rctx;
-       struct hash_desc desc;
 
        rctx = ahash_request_ctx(req);
 
        if (unlikely(err == -EINPROGRESS))
                goto out;
 
-       desc.tfm = child;
-       desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
-
-       err = crypto_hash_crt(child)->update(&desc,
-                                               req->src,
-                                               req->nbytes);
+       err = shash_ahash_update(req, &rctx->desc);
 
        req->base.complete = rctx->complete;
 
@@ -449,21 +451,13 @@ static int cryptd_hash_update_enqueue(struct ahash_request *req)
 
 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 {
-       struct cryptd_hash_ctx *ctx   = crypto_tfm_ctx(req_async->tfm);
-       struct crypto_hash     *child = ctx->child;
-       struct ahash_request    *req = ahash_request_cast(req_async);
-       struct cryptd_hash_request_ctx *rctx;
-       struct hash_desc desc;
-
-       rctx = ahash_request_ctx(req);
+       struct ahash_request *req = ahash_request_cast(req_async);
+       struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 
        if (unlikely(err == -EINPROGRESS))
                goto out;
 
-       desc.tfm = child;
-       desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
-
-       err = crypto_hash_crt(child)->final(&desc, req->result);
+       err = crypto_shash_final(&rctx->desc, req->result);
 
        req->base.complete = rctx->complete;
 
@@ -480,24 +474,19 @@ static int cryptd_hash_final_enqueue(struct ahash_request *req)
 
 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 {
-       struct cryptd_hash_ctx *ctx   = crypto_tfm_ctx(req_async->tfm);
-       struct crypto_hash     *child = ctx->child;
-       struct ahash_request    *req = ahash_request_cast(req_async);
-       struct cryptd_hash_request_ctx *rctx;
-       struct hash_desc desc;
-
-       rctx = ahash_request_ctx(req);
+       struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
+       struct crypto_shash *child = ctx->child;
+       struct ahash_request *req = ahash_request_cast(req_async);
+       struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+       struct shash_desc *desc = &rctx->desc;
 
        if (unlikely(err == -EINPROGRESS))
                goto out;
 
-       desc.tfm = child;
-       desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+       desc->tfm = child;
+       desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       err = crypto_hash_crt(child)->digest(&desc,
-                                               req->src,
-                                               req->nbytes,
-                                               req->result);
+       err = shash_ahash_digest(req, desc);
 
        req->base.complete = rctx->complete;
 
@@ -515,22 +504,32 @@ static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 static struct crypto_instance *cryptd_alloc_hash(
        struct rtattr **tb, struct cryptd_queue *queue)
 {
+       struct hashd_instance_ctx *ctx;
        struct crypto_instance *inst;
+       struct shash_alg *salg;
        struct crypto_alg *alg;
+       int err;
 
-       alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_HASH,
-                                 CRYPTO_ALG_TYPE_HASH_MASK);
-       if (IS_ERR(alg))
-               return ERR_PTR(PTR_ERR(alg));
+       salg = shash_attr_alg(tb[1], 0, 0);
+       if (IS_ERR(salg))
+               return ERR_CAST(salg);
 
-       inst = cryptd_alloc_instance(alg, queue);
+       alg = &salg->base;
+       inst = cryptd_alloc_instance(alg, sizeof(*ctx));
        if (IS_ERR(inst))
                goto out_put_alg;
 
+       ctx = crypto_instance_ctx(inst);
+       ctx->queue = queue;
+
+       err = crypto_init_shash_spawn(&ctx->spawn, salg, inst);
+       if (err)
+               goto out_free_inst;
+
        inst->alg.cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC;
        inst->alg.cra_type = &crypto_ahash_type;
 
-       inst->alg.cra_ahash.digestsize = alg->cra_hash.digestsize;
+       inst->alg.cra_ahash.digestsize = salg->digestsize;
        inst->alg.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 
        inst->alg.cra_init = cryptd_hash_init_tfm;
@@ -545,6 +544,11 @@ static struct crypto_instance *cryptd_alloc_hash(
 out_put_alg:
        crypto_mod_put(alg);
        return inst;
+
+out_free_inst:
+       kfree(inst);
+       inst = ERR_PTR(err);
+       goto out_put_alg;
 }
 
 static struct cryptd_queue queue;