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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#include <crypto/scatterwalk.h>
#include <linux/cryptouser.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 <linux/string.h>
#include <net/netlink.h>
#include "hash.h"
static const struct crypto_type crypto_ahash_type;
struct ahash_request_priv {
crypto_completion_t complete;
void *data;
u8 *result;
u32 flags;
void *ubuf[] CRYPTO_MINALIGN_ATTR;
};
static int hash_walk_next(struct crypto_hash_walk *walk)
{
unsigned int alignmask = walk->alignmask;
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;
if (offset & alignmask) {
unsigned int unaligned = alignmask + 1 - (offset & alignmask);
if (nbytes > unaligned)
nbytes = unaligned;
}
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_done(struct crypto_hash_walk *walk, int err)
{
unsigned int alignmask = walk->alignmask;
walk->data -= walk->offset;
if (walk->entrylen && (walk->offset & alignmask) && !err) {
unsigned int nbytes;
walk->offset = ALIGN(walk->offset, alignmask + 1);
nbytes = min(walk->entrylen,
(unsigned int)(PAGE_SIZE - walk->offset));
if (nbytes) {
walk->entrylen -= nbytes;
walk->data += walk->offset;
return nbytes;
}
}
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);
int crypto_hash_walk_first(struct ahash_request *req,
struct crypto_hash_walk *walk)
{
walk->total = req->nbytes;
if (!walk->total) {
walk->entrylen = 0;
return 0;
}
walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
walk->sg = req->src;
walk->flags = req->base.flags;
return hash_walk_new_entry(walk);
}
EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen)
{
unsigned long alignmask = crypto_ahash_alignmask(tfm);
int ret;
u8 *buffer, *alignbuffer;
unsigned long absize;
absize = keylen + alignmask;
buffer = kmalloc(absize, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
memcpy(alignbuffer, key, keylen);
ret = tfm->setkey(tfm, alignbuffer, keylen);
kfree_sensitive(buffer);
return ret;
}
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)
{
const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
if (tfm->setkey != ahash_nosetkey &&
!(alg->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)
{
unsigned long alignmask = crypto_ahash_alignmask(tfm);
int err;
if ((unsigned long)key & alignmask)
err = ahash_setkey_unaligned(tfm, key, keylen);
else
err = tfm->setkey(tfm, key, keylen);
if (unlikely(err)) {
ahash_set_needkey(tfm);
return err;
}
crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt,
bool has_state)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
unsigned long alignmask = crypto_ahash_alignmask(tfm);
unsigned int ds = crypto_ahash_digestsize(tfm);
struct ahash_request *subreq;
unsigned int subreq_size;
unsigned int reqsize;
u8 *result;
gfp_t gfp;
u32 flags;
subreq_size = sizeof(*subreq);
reqsize = crypto_ahash_reqsize(tfm);
reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
subreq_size += reqsize;
subreq_size += ds;
subreq_size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
flags = ahash_request_flags(req);
gfp = (flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC;
subreq = kmalloc(subreq_size, gfp);
if (!subreq)
return -ENOMEM;
ahash_request_set_tfm(subreq, tfm);
ahash_request_set_callback(subreq, flags, cplt, req);
result = (u8 *)(subreq + 1) + reqsize;
result = PTR_ALIGN(result, alignmask + 1);
ahash_request_set_crypt(subreq, req->src, result, req->nbytes);
if (has_state) {
void *state;
state = kmalloc(crypto_ahash_statesize(tfm), gfp);
if (!state) {
kfree(subreq);
return -ENOMEM;
}
crypto_ahash_export(req, state);
crypto_ahash_import(subreq, state);
kfree_sensitive(state);
}
req->priv = subreq;
return 0;
}
static void ahash_restore_req(struct ahash_request *req, int err)
{
struct ahash_request *subreq = req->priv;
if (!err)
memcpy(req->result, subreq->result,
crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
req->priv = NULL;
kfree_sensitive(subreq);
}
static void ahash_op_unaligned_done(void *data, int err)
{
struct ahash_request *areq = data;
if (err == -EINPROGRESS)
goto out;
/* First copy req->result into req->priv.result */
ahash_restore_req(areq, err);
out:
/* Complete the ORIGINAL request. */
ahash_request_complete(areq, err);
}
static int ahash_op_unaligned(struct ahash_request *req,
int (*op)(struct ahash_request *),
bool has_state)
{
int err;
err = ahash_save_req(req, ahash_op_unaligned_done, has_state);
if (err)
return err;
err = op(req->priv);
if (err == -EINPROGRESS || err == -EBUSY)
return err;
ahash_restore_req(req, err);
return err;
}
static int crypto_ahash_op(struct ahash_request *req,
int (*op)(struct ahash_request *),
bool has_state)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
unsigned long alignmask = crypto_ahash_alignmask(tfm);
int err;
if ((unsigned long)req->result & alignmask)
err = ahash_op_unaligned(req, op, has_state);
else
err = op(req);
return crypto_hash_errstat(crypto_hash_alg_common(tfm), err);
}
int crypto_ahash_final(struct ahash_request *req)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
if (IS_ENABLED(CONFIG_CRYPTO_STATS))
atomic64_inc(&hash_get_stat(alg)->hash_cnt);
return crypto_ahash_op(req, tfm->final, true);
}
EXPORT_SYMBOL_GPL(crypto_ahash_final);
int crypto_ahash_finup(struct ahash_request *req)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
struct crypto_istat_hash *istat = hash_get_stat(alg);
atomic64_inc(&istat->hash_cnt);
atomic64_add(req->nbytes, &istat->hash_tlen);
}
return crypto_ahash_op(req, tfm->finup, true);
}
EXPORT_SYMBOL_GPL(crypto_ahash_finup);
int crypto_ahash_digest(struct ahash_request *req)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
struct crypto_istat_hash *istat = hash_get_stat(alg);
atomic64_inc(&istat->hash_cnt);
atomic64_add(req->nbytes, &istat->hash_tlen);
}
if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
return crypto_hash_errstat(alg, -ENOKEY);
return crypto_ahash_op(req, tfm->digest, false);
}
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, err);
ahash_request_complete(areq, err);
}
static int ahash_def_finup_finish1(struct ahash_request *req, int err)
{
struct ahash_request *subreq = req->priv;
if (err)
goto out;
subreq->base.complete = ahash_def_finup_done2;
err = crypto_ahash_reqtfm(req)->final(subreq);
if (err == -EINPROGRESS || err == -EBUSY)
return err;
out:
ahash_restore_req(req, err);
return err;
}
static void ahash_def_finup_done1(void *data, int err)
{
struct ahash_request *areq = data;
struct ahash_request *subreq;
if (err == -EINPROGRESS)
goto out;
subreq = areq->priv;
subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
err = ahash_def_finup_finish1(areq, err);
if (err == -EINPROGRESS || err == -EBUSY)
return;
out:
ahash_request_complete(areq, err);
}
static int ahash_def_finup(struct ahash_request *req)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
int err;
err = ahash_save_req(req, ahash_def_finup_done1, true);
if (err)
return err;
err = tfm->update(req->priv);
if (err == -EINPROGRESS || err == -EBUSY)
return err;
return ahash_def_finup_finish1(req, err);
}
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);
alg->exit_tfm(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);
hash->setkey = ahash_nosetkey;
crypto_ahash_set_statesize(hash, alg->halg.statesize);
if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
return crypto_init_shash_ops_async(tfm);
hash->init = alg->init;
hash->update = alg->update;
hash->final = alg->final;
hash->finup = alg->finup ?: ahash_def_finup;
hash->digest = alg->digest;
hash->export = alg->export;
hash->import = alg->import;
if (alg->setkey) {
hash->setkey = alg->setkey;
ahash_set_needkey(hash);
}
if (alg->exit_tfm)
tfm->exit = crypto_ahash_exit_tfm;
return alg->init_tfm ? alg->init_tfm(hash) : 0;
}
static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
{
if (alg->cra_type != &crypto_ahash_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 crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
__maybe_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",
__crypto_hash_alg_common(alg)->digestsize);
}
static int __maybe_unused crypto_ahash_report_stat(
struct sk_buff *skb, struct crypto_alg *alg)
{
return crypto_hash_report_stat(skb, alg, "ahash");
}
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
#ifdef CONFIG_CRYPTO_STATS
.report_stat = crypto_ahash_report_stat,
#endif
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
.type = CRYPTO_ALG_TYPE_AHASH,
.tfmsize = offsetof(struct crypto_ahash, 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);
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 *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->init = hash->init;
nhash->update = hash->update;
nhash->final = hash->final;
nhash->finup = hash->finup;
nhash->digest = hash->digest;
nhash->export = hash->export;
nhash->import = hash->import;
nhash->setkey = hash->setkey;
nhash->reqsize = hash->reqsize;
nhash->statesize = hash->statesize;
if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
return crypto_clone_shash_ops_async(nhash, hash);
err = -ENOSYS;
alg = crypto_ahash_alg(hash);
if (!alg->clone_tfm)
goto out_free_nhash;
err = alg->clone_tfm(nhash, hash);
if (err)
goto out_free_nhash;
return nhash;
out_free_nhash:
crypto_free_ahash(nhash);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_clone_ahash);
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;
err = hash_prepare_alg(&alg->halg);
if (err)
return err;
base->cra_type = &crypto_ahash_type;
base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
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)
goto err;
}
return 0;
err:
for (--i; i >= 0; --i)
crypto_unregister_ahash(&algs[i]);
return ret;
}
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);
bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
{
struct crypto_alg *alg = &halg->base;
if (alg->cra_type != &crypto_ahash_type)
return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
return __crypto_ahash_alg(alg)->setkey != NULL;
}
EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Asynchronous cryptographic hash type");