diff options
Diffstat (limited to 'crypto/ahash.c')
| -rw-r--r-- | crypto/ahash.c | 1023 |
1 files changed, 1023 insertions, 0 deletions
diff --git a/crypto/ahash.c b/crypto/ahash.c new file mode 100644 index 000000000..d86c78f8d --- /dev/null +++ b/crypto/ahash.c @@ -0,0 +1,1023 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Asynchronous Cryptographic Hash operations. + * + * This is the implementation of the ahash (asynchronous hash) API. It differs + * from shash (synchronous hash) in that ahash supports asynchronous operations, + * and it hashes data from scatterlists instead of virtually addressed buffers. + * + * The ahash API provides access to both ahash and shash algorithms. The shash + * API only provides access to shash algorithms. + * + * Copyright (c) 2008 Loc Ho <lho@amcc.com> + */ + +#include <crypto/scatterwalk.h> +#include <linux/cryptouser.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/seq_file.h> +#include <linux/string.h> +#include <linux/string_choices.h> +#include <net/netlink.h> + +#include "hash.h" + +#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e + +static int ahash_def_finup(struct ahash_request *req); + +static inline bool crypto_ahash_block_only(struct crypto_ahash *tfm) +{ + return crypto_ahash_alg(tfm)->halg.base.cra_flags & + CRYPTO_AHASH_ALG_BLOCK_ONLY; +} + +static inline bool crypto_ahash_final_nonzero(struct crypto_ahash *tfm) +{ + return crypto_ahash_alg(tfm)->halg.base.cra_flags & + CRYPTO_AHASH_ALG_FINAL_NONZERO; +} + +static inline bool crypto_ahash_need_fallback(struct crypto_ahash *tfm) +{ + return crypto_ahash_alg(tfm)->halg.base.cra_flags & + CRYPTO_ALG_NEED_FALLBACK; +} + +static inline void ahash_op_done(void *data, int err, + int (*finish)(struct ahash_request *, int)) +{ + struct ahash_request *areq = data; + crypto_completion_t compl; + + compl = areq->saved_complete; + data = areq->saved_data; + if (err == -EINPROGRESS) + goto out; + + areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; + + err = finish(areq, err); + if (err == -EINPROGRESS || err == -EBUSY) + return; + +out: + compl(data, err); +} + +static int hash_walk_next(struct crypto_hash_walk *walk) +{ + unsigned int offset = walk->offset; + unsigned int nbytes = min(walk->entrylen, + ((unsigned int)(PAGE_SIZE)) - offset); + + walk->data = kmap_local_page(walk->pg); + walk->data += offset; + walk->entrylen -= nbytes; + return nbytes; +} + +static int hash_walk_new_entry(struct crypto_hash_walk *walk) +{ + struct scatterlist *sg; + + sg = walk->sg; + walk->offset = sg->offset; + walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT); + walk->offset = offset_in_page(walk->offset); + walk->entrylen = sg->length; + + if (walk->entrylen > walk->total) + walk->entrylen = walk->total; + walk->total -= walk->entrylen; + + return hash_walk_next(walk); +} + +int crypto_hash_walk_first(struct ahash_request *req, + struct crypto_hash_walk *walk) +{ + walk->total = req->nbytes; + walk->entrylen = 0; + + if (!walk->total) + return 0; + + walk->flags = req->base.flags; + + if (ahash_request_isvirt(req)) { + walk->data = req->svirt; + walk->total = 0; + return req->nbytes; + } + + walk->sg = req->src; + + return hash_walk_new_entry(walk); +} +EXPORT_SYMBOL_GPL(crypto_hash_walk_first); + +int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) +{ + if ((walk->flags & CRYPTO_AHASH_REQ_VIRT)) + return err; + + walk->data -= walk->offset; + + kunmap_local(walk->data); + crypto_yield(walk->flags); + + if (err) + return err; + + if (walk->entrylen) { + walk->offset = 0; + walk->pg++; + return hash_walk_next(walk); + } + + if (!walk->total) + return 0; + + walk->sg = sg_next(walk->sg); + + return hash_walk_new_entry(walk); +} +EXPORT_SYMBOL_GPL(crypto_hash_walk_done); + +/* + * For an ahash tfm that is using an shash algorithm (instead of an ahash + * algorithm), this returns the underlying shash tfm. + */ +static inline struct crypto_shash *ahash_to_shash(struct crypto_ahash *tfm) +{ + return *(struct crypto_shash **)crypto_ahash_ctx(tfm); +} + +static inline struct shash_desc *prepare_shash_desc(struct ahash_request *req, + struct crypto_ahash *tfm) +{ + struct shash_desc *desc = ahash_request_ctx(req); + + desc->tfm = ahash_to_shash(tfm); + return 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); + +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); + +int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc) +{ + unsigned int nbytes = req->nbytes; + struct scatterlist *sg; + unsigned int offset; + struct page *page; + const u8 *data; + int err; + + data = req->svirt; + if (!nbytes || ahash_request_isvirt(req)) + return crypto_shash_digest(desc, data, nbytes, req->result); + + sg = req->src; + if (nbytes > sg->length) + return crypto_shash_init(desc) ?: + shash_ahash_finup(req, desc); + + page = sg_page(sg); + offset = sg->offset; + data = lowmem_page_address(page) + offset; + if (!IS_ENABLED(CONFIG_HIGHMEM)) + return crypto_shash_digest(desc, data, nbytes, req->result); + + page += offset >> PAGE_SHIFT; + offset = offset_in_page(offset); + + if (nbytes > (unsigned int)PAGE_SIZE - offset) + return crypto_shash_init(desc) ?: + shash_ahash_finup(req, desc); + + data = kmap_local_page(page); + err = crypto_shash_digest(desc, data + offset, nbytes, + req->result); + kunmap_local(data); + return err; +} +EXPORT_SYMBOL_GPL(shash_ahash_digest); + +static void crypto_exit_ahash_using_shash(struct crypto_tfm *tfm) +{ + struct crypto_shash **ctx = crypto_tfm_ctx(tfm); + + crypto_free_shash(*ctx); +} + +static int crypto_init_ahash_using_shash(struct crypto_tfm *tfm) +{ + struct crypto_alg *calg = tfm->__crt_alg; + 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); + } + + crt->using_shash = true; + *ctx = shash; + tfm->exit = crypto_exit_ahash_using_shash; + + crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) & + CRYPTO_TFM_NEED_KEY); + + return 0; +} + +static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, + unsigned int keylen) +{ + return -ENOSYS; +} + +static void ahash_set_needkey(struct crypto_ahash *tfm, struct ahash_alg *alg) +{ + if (alg->setkey != ahash_nosetkey && + !(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY)) + crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY); +} + +int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, + unsigned int keylen) +{ + if (likely(tfm->using_shash)) { + struct crypto_shash *shash = ahash_to_shash(tfm); + int err; + + err = crypto_shash_setkey(shash, key, keylen); + if (unlikely(err)) { + crypto_ahash_set_flags(tfm, + crypto_shash_get_flags(shash) & + CRYPTO_TFM_NEED_KEY); + return err; + } + } else { + struct ahash_alg *alg = crypto_ahash_alg(tfm); + int err; + + err = alg->setkey(tfm, key, keylen); + if (!err && crypto_ahash_need_fallback(tfm)) + err = crypto_ahash_setkey(crypto_ahash_fb(tfm), + key, keylen); + if (unlikely(err)) { + ahash_set_needkey(tfm, alg); + return err; + } + } + crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); + return 0; +} +EXPORT_SYMBOL_GPL(crypto_ahash_setkey); + +static int ahash_do_req_chain(struct ahash_request *req, + int (*const *op)(struct ahash_request *req)) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + int err; + + if (crypto_ahash_req_virt(tfm) || !ahash_request_isvirt(req)) + return (*op)(req); + + if (crypto_ahash_statesize(tfm) > HASH_MAX_STATESIZE) + return -ENOSYS; + + if (!crypto_ahash_need_fallback(tfm)) + return -ENOSYS; + + if (crypto_hash_no_export_core(tfm)) + return -ENOSYS; + + { + u8 state[HASH_MAX_STATESIZE]; + + if (op == &crypto_ahash_alg(tfm)->digest) { + ahash_request_set_tfm(req, crypto_ahash_fb(tfm)); + err = crypto_ahash_digest(req); + goto out_no_state; + } + + err = crypto_ahash_export(req, state); + ahash_request_set_tfm(req, crypto_ahash_fb(tfm)); + err = err ?: crypto_ahash_import(req, state); + + if (op == &crypto_ahash_alg(tfm)->finup) { + err = err ?: crypto_ahash_finup(req); + goto out_no_state; + } + + err = err ?: + crypto_ahash_update(req) ?: + crypto_ahash_export(req, state); + + ahash_request_set_tfm(req, tfm); + return err ?: crypto_ahash_import(req, state); + +out_no_state: + ahash_request_set_tfm(req, tfm); + return err; + } +} + +int crypto_ahash_init(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + + if (likely(tfm->using_shash)) + return crypto_shash_init(prepare_shash_desc(req, tfm)); + if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) + return -ENOKEY; + if (ahash_req_on_stack(req) && ahash_is_async(tfm)) + return -EAGAIN; + if (crypto_ahash_block_only(tfm)) { + u8 *buf = ahash_request_ctx(req); + + buf += crypto_ahash_reqsize(tfm) - 1; + *buf = 0; + } + return crypto_ahash_alg(tfm)->init(req); +} +EXPORT_SYMBOL_GPL(crypto_ahash_init); + +static void ahash_save_req(struct ahash_request *req, crypto_completion_t cplt) +{ + req->saved_complete = req->base.complete; + req->saved_data = req->base.data; + req->base.complete = cplt; + req->base.data = req; +} + +static void ahash_restore_req(struct ahash_request *req) +{ + req->base.complete = req->saved_complete; + req->base.data = req->saved_data; +} + +static int ahash_update_finish(struct ahash_request *req, int err) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + bool nonzero = crypto_ahash_final_nonzero(tfm); + int bs = crypto_ahash_blocksize(tfm); + u8 *blenp = ahash_request_ctx(req); + int blen; + u8 *buf; + + blenp += crypto_ahash_reqsize(tfm) - 1; + blen = *blenp; + buf = blenp - bs; + + if (blen) { + req->src = req->sg_head + 1; + if (sg_is_chain(req->src)) + req->src = sg_chain_ptr(req->src); + } + + req->nbytes += nonzero - blen; + + blen = 0; + if (err >= 0) { + blen = err + nonzero; + err = 0; + } + if (ahash_request_isvirt(req)) + memcpy(buf, req->svirt + req->nbytes - blen, blen); + else + memcpy_from_sglist(buf, req->src, req->nbytes - blen, blen); + *blenp = blen; + + ahash_restore_req(req); + + return err; +} + +static void ahash_update_done(void *data, int err) +{ + ahash_op_done(data, err, ahash_update_finish); +} + +int crypto_ahash_update(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + bool nonzero = crypto_ahash_final_nonzero(tfm); + int bs = crypto_ahash_blocksize(tfm); + u8 *blenp = ahash_request_ctx(req); + int blen, err; + u8 *buf; + + if (likely(tfm->using_shash)) + return shash_ahash_update(req, ahash_request_ctx(req)); + if (ahash_req_on_stack(req) && ahash_is_async(tfm)) + return -EAGAIN; + if (!crypto_ahash_block_only(tfm)) + return ahash_do_req_chain(req, &crypto_ahash_alg(tfm)->update); + + blenp += crypto_ahash_reqsize(tfm) - 1; + blen = *blenp; + buf = blenp - bs; + + if (blen + req->nbytes < bs + nonzero) { + if (ahash_request_isvirt(req)) + memcpy(buf + blen, req->svirt, req->nbytes); + else + memcpy_from_sglist(buf + blen, req->src, 0, + req->nbytes); + + *blenp += req->nbytes; + return 0; + } + + if (blen) { + memset(req->sg_head, 0, sizeof(req->sg_head[0])); + sg_set_buf(req->sg_head, buf, blen); + if (req->src != req->sg_head + 1) + sg_chain(req->sg_head, 2, req->src); + req->src = req->sg_head; + req->nbytes += blen; + } + req->nbytes -= nonzero; + + ahash_save_req(req, ahash_update_done); + + err = ahash_do_req_chain(req, &crypto_ahash_alg(tfm)->update); + if (err == -EINPROGRESS || err == -EBUSY) + return err; + + return ahash_update_finish(req, err); +} +EXPORT_SYMBOL_GPL(crypto_ahash_update); + +static int ahash_finup_finish(struct ahash_request *req, int err) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + u8 *blenp = ahash_request_ctx(req); + int blen; + + blenp += crypto_ahash_reqsize(tfm) - 1; + blen = *blenp; + + if (blen) { + if (sg_is_last(req->src)) + req->src = NULL; + else { + req->src = req->sg_head + 1; + if (sg_is_chain(req->src)) + req->src = sg_chain_ptr(req->src); + } + req->nbytes -= blen; + } + + ahash_restore_req(req); + + return err; +} + +static void ahash_finup_done(void *data, int err) +{ + ahash_op_done(data, err, ahash_finup_finish); +} + +int crypto_ahash_finup(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + int bs = crypto_ahash_blocksize(tfm); + u8 *blenp = ahash_request_ctx(req); + int blen, err; + u8 *buf; + + if (likely(tfm->using_shash)) + return shash_ahash_finup(req, ahash_request_ctx(req)); + if (ahash_req_on_stack(req) && ahash_is_async(tfm)) + return -EAGAIN; + if (!crypto_ahash_alg(tfm)->finup) + return ahash_def_finup(req); + if (!crypto_ahash_block_only(tfm)) + return ahash_do_req_chain(req, &crypto_ahash_alg(tfm)->finup); + + blenp += crypto_ahash_reqsize(tfm) - 1; + blen = *blenp; + buf = blenp - bs; + + if (blen) { + memset(req->sg_head, 0, sizeof(req->sg_head[0])); + sg_set_buf(req->sg_head, buf, blen); + if (!req->src) + sg_mark_end(req->sg_head); + else if (req->src != req->sg_head + 1) + sg_chain(req->sg_head, 2, req->src); + req->src = req->sg_head; + req->nbytes += blen; + } + + ahash_save_req(req, ahash_finup_done); + + err = ahash_do_req_chain(req, &crypto_ahash_alg(tfm)->finup); + if (err == -EINPROGRESS || err == -EBUSY) + return err; + + return ahash_finup_finish(req, err); +} +EXPORT_SYMBOL_GPL(crypto_ahash_finup); + +int crypto_ahash_digest(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + + if (likely(tfm->using_shash)) + return shash_ahash_digest(req, prepare_shash_desc(req, tfm)); + if (ahash_req_on_stack(req) && ahash_is_async(tfm)) + return -EAGAIN; + if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) + return -ENOKEY; + return ahash_do_req_chain(req, &crypto_ahash_alg(tfm)->digest); +} +EXPORT_SYMBOL_GPL(crypto_ahash_digest); + +static void ahash_def_finup_done2(void *data, int err) +{ + struct ahash_request *areq = data; + + if (err == -EINPROGRESS) + return; + + ahash_restore_req(areq); + ahash_request_complete(areq, err); +} + +static int ahash_def_finup_finish1(struct ahash_request *req, int err) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + + if (err) + goto out; + + req->base.complete = ahash_def_finup_done2; + + err = crypto_ahash_alg(tfm)->final(req); + if (err == -EINPROGRESS || err == -EBUSY) + return err; + +out: + ahash_restore_req(req); + return err; +} + +static void ahash_def_finup_done1(void *data, int err) +{ + ahash_op_done(data, err, ahash_def_finup_finish1); +} + +static int ahash_def_finup(struct ahash_request *req) +{ + int err; + + ahash_save_req(req, ahash_def_finup_done1); + + err = crypto_ahash_update(req); + if (err == -EINPROGRESS || err == -EBUSY) + return err; + + return ahash_def_finup_finish1(req, err); +} + +int crypto_ahash_export_core(struct ahash_request *req, void *out) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + + if (likely(tfm->using_shash)) + return crypto_shash_export_core(ahash_request_ctx(req), out); + return crypto_ahash_alg(tfm)->export_core(req, out); +} +EXPORT_SYMBOL_GPL(crypto_ahash_export_core); + +int crypto_ahash_export(struct ahash_request *req, void *out) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + + if (likely(tfm->using_shash)) + return crypto_shash_export(ahash_request_ctx(req), out); + if (crypto_ahash_block_only(tfm)) { + unsigned int plen = crypto_ahash_blocksize(tfm) + 1; + unsigned int reqsize = crypto_ahash_reqsize(tfm); + unsigned int ss = crypto_ahash_statesize(tfm); + u8 *buf = ahash_request_ctx(req); + + memcpy(out + ss - plen, buf + reqsize - plen, plen); + } + return crypto_ahash_alg(tfm)->export(req, out); +} +EXPORT_SYMBOL_GPL(crypto_ahash_export); + +int crypto_ahash_import_core(struct ahash_request *req, const void *in) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + + if (likely(tfm->using_shash)) + return crypto_shash_import_core(prepare_shash_desc(req, tfm), + in); + if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) + return -ENOKEY; + if (crypto_ahash_block_only(tfm)) { + unsigned int reqsize = crypto_ahash_reqsize(tfm); + u8 *buf = ahash_request_ctx(req); + + buf[reqsize - 1] = 0; + } + return crypto_ahash_alg(tfm)->import_core(req, in); +} +EXPORT_SYMBOL_GPL(crypto_ahash_import_core); + +int crypto_ahash_import(struct ahash_request *req, const void *in) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + + if (likely(tfm->using_shash)) + return crypto_shash_import(prepare_shash_desc(req, tfm), in); + if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) + return -ENOKEY; + if (crypto_ahash_block_only(tfm)) { + unsigned int plen = crypto_ahash_blocksize(tfm) + 1; + unsigned int reqsize = crypto_ahash_reqsize(tfm); + unsigned int ss = crypto_ahash_statesize(tfm); + u8 *buf = ahash_request_ctx(req); + + memcpy(buf + reqsize - plen, in + ss - plen, plen); + if (buf[reqsize - 1] >= plen) + return -EOVERFLOW; + } + return crypto_ahash_alg(tfm)->import(req, in); +} +EXPORT_SYMBOL_GPL(crypto_ahash_import); + +static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm) +{ + struct crypto_ahash *hash = __crypto_ahash_cast(tfm); + struct ahash_alg *alg = crypto_ahash_alg(hash); + + if (alg->exit_tfm) + alg->exit_tfm(hash); + else if (tfm->__crt_alg->cra_exit) + tfm->__crt_alg->cra_exit(tfm); + + if (crypto_ahash_need_fallback(hash)) + crypto_free_ahash(crypto_ahash_fb(hash)); +} + +static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) +{ + struct crypto_ahash *hash = __crypto_ahash_cast(tfm); + struct ahash_alg *alg = crypto_ahash_alg(hash); + struct crypto_ahash *fb = NULL; + int err; + + crypto_ahash_set_statesize(hash, alg->halg.statesize); + crypto_ahash_set_reqsize(hash, crypto_tfm_alg_reqsize(tfm)); + + if (tfm->__crt_alg->cra_type == &crypto_shash_type) + return crypto_init_ahash_using_shash(tfm); + + if (crypto_ahash_need_fallback(hash)) { + fb = crypto_alloc_ahash(crypto_ahash_alg_name(hash), + CRYPTO_ALG_REQ_VIRT, + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_REQ_VIRT | + CRYPTO_AHASH_ALG_NO_EXPORT_CORE); + if (IS_ERR(fb)) + return PTR_ERR(fb); + + tfm->fb = crypto_ahash_tfm(fb); + } + + ahash_set_needkey(hash, alg); + + tfm->exit = crypto_ahash_exit_tfm; + + if (alg->init_tfm) + err = alg->init_tfm(hash); + else if (tfm->__crt_alg->cra_init) + err = tfm->__crt_alg->cra_init(tfm); + else + return 0; + + if (err) + goto out_free_sync_hash; + + if (!ahash_is_async(hash) && crypto_ahash_reqsize(hash) > + MAX_SYNC_HASH_REQSIZE) + goto out_exit_tfm; + + BUILD_BUG_ON(HASH_MAX_DESCSIZE > MAX_SYNC_HASH_REQSIZE); + if (crypto_ahash_reqsize(hash) < HASH_MAX_DESCSIZE) + crypto_ahash_set_reqsize(hash, HASH_MAX_DESCSIZE); + + return 0; + +out_exit_tfm: + if (alg->exit_tfm) + alg->exit_tfm(hash); + else if (tfm->__crt_alg->cra_exit) + tfm->__crt_alg->cra_exit(tfm); + err = -EINVAL; +out_free_sync_hash: + crypto_free_ahash(fb); + return err; +} + +static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) +{ + if (alg->cra_type == &crypto_shash_type) + return sizeof(struct crypto_shash *); + + return crypto_alg_extsize(alg); +} + +static void crypto_ahash_free_instance(struct crypto_instance *inst) +{ + struct ahash_instance *ahash = ahash_instance(inst); + + ahash->free(ahash); +} + +static int __maybe_unused crypto_ahash_report( + struct sk_buff *skb, struct crypto_alg *alg) +{ + struct crypto_report_hash rhash = { + .type = "ahash", + }; + + rhash.blocksize = alg->cra_blocksize; + rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize; + + return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash); +} + +static void __maybe_unused crypto_ahash_show(struct seq_file *m, + struct crypto_alg *alg) +{ + seq_printf(m, "type : ahash\n"); + seq_printf(m, "async : %s\n", + str_yes_no(alg->cra_flags & CRYPTO_ALG_ASYNC)); + seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); + seq_printf(m, "digestsize : %u\n", + __crypto_hash_alg_common(alg)->digestsize); +} + +static const struct crypto_type crypto_ahash_type = { + .extsize = crypto_ahash_extsize, + .init_tfm = crypto_ahash_init_tfm, + .free = crypto_ahash_free_instance, +#ifdef CONFIG_PROC_FS + .show = crypto_ahash_show, +#endif +#if IS_ENABLED(CONFIG_CRYPTO_USER) + .report = crypto_ahash_report, +#endif + .maskclear = ~CRYPTO_ALG_TYPE_MASK, + .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, + .type = CRYPTO_ALG_TYPE_AHASH, + .tfmsize = offsetof(struct crypto_ahash, base), + .algsize = offsetof(struct ahash_alg, halg.base), +}; + +int crypto_grab_ahash(struct crypto_ahash_spawn *spawn, + struct crypto_instance *inst, + const char *name, u32 type, u32 mask) +{ + spawn->base.frontend = &crypto_ahash_type; + return crypto_grab_spawn(&spawn->base, inst, name, type, mask); +} +EXPORT_SYMBOL_GPL(crypto_grab_ahash); + +struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, + u32 mask) +{ + return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); +} +EXPORT_SYMBOL_GPL(crypto_alloc_ahash); + +int crypto_has_ahash(const char *alg_name, u32 type, u32 mask) +{ + return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask); +} +EXPORT_SYMBOL_GPL(crypto_has_ahash); + +bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg) +{ + struct crypto_alg *alg = &halg->base; + + if (alg->cra_type == &crypto_shash_type) + return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg)); + + return __crypto_ahash_alg(alg)->setkey != ahash_nosetkey; +} +EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey); + +static int ahash_default_export_core(struct ahash_request *req, void *out) +{ + return -ENOSYS; +} + +static int ahash_default_import_core(struct ahash_request *req, const void *in) +{ + return -ENOSYS; +} + +static int ahash_prepare_alg(struct ahash_alg *alg) +{ + struct crypto_alg *base = &alg->halg.base; + int err; + + if (alg->halg.statesize == 0) + return -EINVAL; + + if (base->cra_reqsize && base->cra_reqsize < alg->halg.statesize) + return -EINVAL; + + if (!(base->cra_flags & CRYPTO_ALG_ASYNC) && + base->cra_reqsize > MAX_SYNC_HASH_REQSIZE) + return -EINVAL; + + if (base->cra_flags & CRYPTO_ALG_NEED_FALLBACK && + base->cra_flags & CRYPTO_ALG_NO_FALLBACK) + return -EINVAL; + + err = hash_prepare_alg(&alg->halg); + if (err) + return err; + + base->cra_type = &crypto_ahash_type; + base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; + + if ((base->cra_flags ^ CRYPTO_ALG_REQ_VIRT) & + (CRYPTO_ALG_ASYNC | CRYPTO_ALG_REQ_VIRT) && + !(base->cra_flags & CRYPTO_ALG_NO_FALLBACK)) + base->cra_flags |= CRYPTO_ALG_NEED_FALLBACK; + + if (!alg->setkey) + alg->setkey = ahash_nosetkey; + + if (base->cra_flags & CRYPTO_AHASH_ALG_BLOCK_ONLY) { + BUILD_BUG_ON(MAX_ALGAPI_BLOCKSIZE >= 256); + if (!alg->finup) + return -EINVAL; + + base->cra_reqsize += base->cra_blocksize + 1; + alg->halg.statesize += base->cra_blocksize + 1; + alg->export_core = alg->export; + alg->import_core = alg->import; + } else if (!alg->export_core || !alg->import_core) { + alg->export_core = ahash_default_export_core; + alg->import_core = ahash_default_import_core; + base->cra_flags |= CRYPTO_AHASH_ALG_NO_EXPORT_CORE; + } + + return 0; +} + +int crypto_register_ahash(struct ahash_alg *alg) +{ + struct crypto_alg *base = &alg->halg.base; + int err; + + err = ahash_prepare_alg(alg); + if (err) + return err; + + return crypto_register_alg(base); +} +EXPORT_SYMBOL_GPL(crypto_register_ahash); + +void crypto_unregister_ahash(struct ahash_alg *alg) +{ + crypto_unregister_alg(&alg->halg.base); +} +EXPORT_SYMBOL_GPL(crypto_unregister_ahash); + +int crypto_register_ahashes(struct ahash_alg *algs, int count) +{ + int i, ret; + + for (i = 0; i < count; i++) { + ret = crypto_register_ahash(&algs[i]); + if (ret) { + crypto_unregister_ahashes(algs, i); + return ret; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(crypto_register_ahashes); + +void crypto_unregister_ahashes(struct ahash_alg *algs, int count) +{ + int i; + + for (i = count - 1; i >= 0; --i) + crypto_unregister_ahash(&algs[i]); +} +EXPORT_SYMBOL_GPL(crypto_unregister_ahashes); + +int ahash_register_instance(struct crypto_template *tmpl, + struct ahash_instance *inst) +{ + int err; + + if (WARN_ON(!inst->free)) + return -EINVAL; + + err = ahash_prepare_alg(&inst->alg); + if (err) + return err; + + return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); +} +EXPORT_SYMBOL_GPL(ahash_register_instance); + +void ahash_request_free(struct ahash_request *req) +{ + if (unlikely(!req)) + return; + + if (!ahash_req_on_stack(req)) { + kfree(req); + return; + } + + ahash_request_zero(req); +} +EXPORT_SYMBOL_GPL(ahash_request_free); + +int crypto_hash_digest(struct crypto_ahash *tfm, const u8 *data, + unsigned int len, u8 *out) +{ + HASH_REQUEST_ON_STACK(req, crypto_ahash_fb(tfm)); + int err; + + ahash_request_set_callback(req, 0, NULL, NULL); + ahash_request_set_virt(req, data, out, len); + err = crypto_ahash_digest(req); + + ahash_request_zero(req); + + return err; +} +EXPORT_SYMBOL_GPL(crypto_hash_digest); + +void ahash_free_singlespawn_instance(struct ahash_instance *inst) +{ + crypto_drop_spawn(ahash_instance_ctx(inst)); + kfree(inst); +} +EXPORT_SYMBOL_GPL(ahash_free_singlespawn_instance); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |