diff options
Diffstat (limited to 'crypto/ahash.c')
| -rw-r--r-- | crypto/ahash.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/crypto/ahash.c b/crypto/ahash.c index 1ad402f4dac6c..74be1eb26c1aa 100644 --- a/crypto/ahash.c +++ b/crypto/ahash.c @@ -29,6 +29,192 @@ static const struct crypto_type crypto_ahash_type; +static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, + unsigned int keylen) +{ + struct crypto_shash **ctx = crypto_ahash_ctx(tfm); + + return crypto_shash_setkey(*ctx, key, keylen); +} + +static int shash_async_init(struct ahash_request *req) +{ + struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct shash_desc *desc = ahash_request_ctx(req); + + desc->tfm = *ctx; + + return crypto_shash_init(desc); +} + +int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc) +{ + struct crypto_hash_walk walk; + int nbytes; + + for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; + nbytes = crypto_hash_walk_done(&walk, nbytes)) + nbytes = crypto_shash_update(desc, walk.data, nbytes); + + return nbytes; +} +EXPORT_SYMBOL_GPL(shash_ahash_update); + +static int shash_async_update(struct ahash_request *req) +{ + return shash_ahash_update(req, ahash_request_ctx(req)); +} + +static int shash_async_final(struct ahash_request *req) +{ + return crypto_shash_final(ahash_request_ctx(req), req->result); +} + +int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc) +{ + struct crypto_hash_walk walk; + int nbytes; + + nbytes = crypto_hash_walk_first(req, &walk); + if (!nbytes) + return crypto_shash_final(desc, req->result); + + do { + nbytes = crypto_hash_walk_last(&walk) ? + crypto_shash_finup(desc, walk.data, nbytes, + req->result) : + crypto_shash_update(desc, walk.data, nbytes); + nbytes = crypto_hash_walk_done(&walk, nbytes); + } while (nbytes > 0); + + return nbytes; +} +EXPORT_SYMBOL_GPL(shash_ahash_finup); + +static int shash_async_finup(struct ahash_request *req) +{ + struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct shash_desc *desc = ahash_request_ctx(req); + + desc->tfm = *ctx; + + return shash_ahash_finup(req, desc); +} + +int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc) +{ + unsigned int nbytes = req->nbytes; + struct scatterlist *sg; + unsigned int offset; + int err; + + if (nbytes && + (sg = req->src, offset = sg->offset, + nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) { + void *data; + + data = kmap_local_page(sg_page(sg)); + err = crypto_shash_digest(desc, data + offset, nbytes, + req->result); + kunmap_local(data); + } else + err = crypto_shash_init(desc) ?: + shash_ahash_finup(req, desc); + + return err; +} +EXPORT_SYMBOL_GPL(shash_ahash_digest); + +static int shash_async_digest(struct ahash_request *req) +{ + struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct shash_desc *desc = ahash_request_ctx(req); + + desc->tfm = *ctx; + + return shash_ahash_digest(req, desc); +} + +static int shash_async_export(struct ahash_request *req, void *out) +{ + return crypto_shash_export(ahash_request_ctx(req), out); +} + +static int shash_async_import(struct ahash_request *req, const void *in) +{ + struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct shash_desc *desc = ahash_request_ctx(req); + + desc->tfm = *ctx; + + return crypto_shash_import(desc, in); +} + +static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) +{ + struct crypto_shash **ctx = crypto_tfm_ctx(tfm); + + crypto_free_shash(*ctx); +} + +static int crypto_init_shash_ops_async(struct crypto_tfm *tfm) +{ + struct crypto_alg *calg = tfm->__crt_alg; + struct shash_alg *alg = __crypto_shash_alg(calg); + struct crypto_ahash *crt = __crypto_ahash_cast(tfm); + struct crypto_shash **ctx = crypto_tfm_ctx(tfm); + struct crypto_shash *shash; + + if (!crypto_mod_get(calg)) + return -EAGAIN; + + shash = crypto_create_tfm(calg, &crypto_shash_type); + if (IS_ERR(shash)) { + crypto_mod_put(calg); + return PTR_ERR(shash); + } + + *ctx = shash; + tfm->exit = crypto_exit_shash_ops_async; + + crt->init = shash_async_init; + crt->update = shash_async_update; + crt->final = shash_async_final; + crt->finup = shash_async_finup; + crt->digest = shash_async_digest; + if (crypto_shash_alg_has_setkey(alg)) + crt->setkey = shash_async_setkey; + + crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) & + CRYPTO_TFM_NEED_KEY); + + crt->export = shash_async_export; + crt->import = shash_async_import; + + crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); + + return 0; +} + +static struct crypto_ahash * +crypto_clone_shash_ops_async(struct crypto_ahash *nhash, + struct crypto_ahash *hash) +{ + struct crypto_shash **nctx = crypto_ahash_ctx(nhash); + struct crypto_shash **ctx = crypto_ahash_ctx(hash); + struct crypto_shash *shash; + + shash = crypto_clone_shash(*ctx); + if (IS_ERR(shash)) { + crypto_free_ahash(nhash); + return ERR_CAST(shash); + } + + *nctx = shash; + + return nhash; +} + static int hash_walk_next(struct crypto_hash_walk *walk) { unsigned int offset = walk->offset; |