#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);
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;
memset(&rhash, 0, sizeof(rhash));
strscpy(rhash.type, "ahash", sizeof(rhash.type));
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);
struct crypto_ahash *crypto_clone_ahash(struct crypto_ahash *hash)
{
struct hash_alg_common *halg = crypto_hash_alg_common(hash);
struct crypto_tfm *tfm = crypto_ahash_tfm(hash);
struct crypto_ahash *fb = NULL;
struct crypto_ahash *nhash;
struct ahash_alg *alg;
int err;
if (!crypto_hash_alg_has_setkey(halg)) {
tfm = crypto_tfm_get(tfm);
if (IS_ERR(tfm))
return ERR_CAST(tfm);
return hash;
}
nhash = crypto_clone_tfm(&crypto_ahash_type, tfm);
if (IS_ERR(nhash))
return nhash;
nhash->reqsize = hash->reqsize;
nhash->statesize = hash->statesize;
if (likely(hash->using_shash)) {
struct crypto_shash **nctx = crypto_ahash_ctx(nhash);
struct crypto_shash *shash;
shash = crypto_clone_shash(ahash_to_shash(hash));
if (IS_ERR(shash)) {
err = PTR_ERR(shash);
goto out_free_nhash;
}
crypto_ahash_tfm(nhash)->exit = crypto_exit_ahash_using_shash;
nhash->using_shash = true;
*nctx = shash;
return nhash;
}
if (crypto_ahash_need_fallback(hash)) {
fb = crypto_clone_ahash(crypto_ahash_fb(hash));
err = PTR_ERR(fb);
if (IS_ERR(fb))
goto out_free_nhash;
crypto_ahash_tfm(nhash)->fb = crypto_ahash_tfm(fb);
}
err = -ENOSYS;
alg = crypto_ahash_alg(hash);
if (!alg->clone_tfm)
goto out_free_fb;
err = alg->clone_tfm(nhash, hash);
if (err)
goto out_free_fb;
crypto_ahash_tfm(nhash)->exit = crypto_ahash_exit_tfm;
return nhash;
out_free_fb:
crypto_free_ahash(fb);
out_free_nhash:
crypto_free_ahash(nhash);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_clone_ahash);
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");
