https://github.com/torvalds/linux
Tip revision: 2cc14f52aeb78ce3f29677c2de1f06c0e91471ab authored by Linus Torvalds on 27 November 2023, 03:59:33 UTC
Linux 6.7-rc3
Linux 6.7-rc3
Tip revision: 2cc14f5
shash.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Synchronous Cryptographic Hash operations.
*
* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
*/
#include <crypto/scatterwalk.h>
#include <linux/cryptouser.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <net/netlink.h>
#include "hash.h"
static inline struct crypto_istat_hash *shash_get_stat(struct shash_alg *alg)
{
return hash_get_stat(&alg->halg);
}
static inline int crypto_shash_errstat(struct shash_alg *alg, int err)
{
if (!IS_ENABLED(CONFIG_CRYPTO_STATS))
return err;
if (err && err != -EINPROGRESS && err != -EBUSY)
atomic64_inc(&shash_get_stat(alg)->err_cnt);
return err;
}
int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen)
{
return -ENOSYS;
}
EXPORT_SYMBOL_GPL(shash_no_setkey);
static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
{
if (crypto_shash_alg_needs_key(alg))
crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
}
int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen)
{
struct shash_alg *shash = crypto_shash_alg(tfm);
int err;
err = shash->setkey(tfm, key, keylen);
if (unlikely(err)) {
shash_set_needkey(tfm, shash);
return err;
}
crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_shash_setkey);
int crypto_shash_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct shash_alg *shash = crypto_shash_alg(desc->tfm);
int err;
if (IS_ENABLED(CONFIG_CRYPTO_STATS))
atomic64_add(len, &shash_get_stat(shash)->hash_tlen);
err = shash->update(desc, data, len);
return crypto_shash_errstat(shash, err);
}
EXPORT_SYMBOL_GPL(crypto_shash_update);
int crypto_shash_final(struct shash_desc *desc, u8 *out)
{
struct shash_alg *shash = crypto_shash_alg(desc->tfm);
int err;
if (IS_ENABLED(CONFIG_CRYPTO_STATS))
atomic64_inc(&shash_get_stat(shash)->hash_cnt);
err = shash->final(desc, out);
return crypto_shash_errstat(shash, err);
}
EXPORT_SYMBOL_GPL(crypto_shash_final);
static int shash_default_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
struct shash_alg *shash = crypto_shash_alg(desc->tfm);
return shash->update(desc, data, len) ?:
shash->final(desc, out);
}
int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
struct crypto_shash *tfm = desc->tfm;
struct shash_alg *shash = crypto_shash_alg(tfm);
int err;
if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
struct crypto_istat_hash *istat = shash_get_stat(shash);
atomic64_inc(&istat->hash_cnt);
atomic64_add(len, &istat->hash_tlen);
}
err = shash->finup(desc, data, len, out);
return crypto_shash_errstat(shash, err);
}
EXPORT_SYMBOL_GPL(crypto_shash_finup);
static int shash_default_digest(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
struct shash_alg *shash = crypto_shash_alg(desc->tfm);
return shash->init(desc) ?:
shash->finup(desc, data, len, out);
}
int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
struct crypto_shash *tfm = desc->tfm;
struct shash_alg *shash = crypto_shash_alg(tfm);
int err;
if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
struct crypto_istat_hash *istat = shash_get_stat(shash);
atomic64_inc(&istat->hash_cnt);
atomic64_add(len, &istat->hash_tlen);
}
if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
err = -ENOKEY;
else
err = shash->digest(desc, data, len, out);
return crypto_shash_errstat(shash, err);
}
EXPORT_SYMBOL_GPL(crypto_shash_digest);
int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
unsigned int len, u8 *out)
{
SHASH_DESC_ON_STACK(desc, tfm);
int err;
desc->tfm = tfm;
err = crypto_shash_digest(desc, data, len, out);
shash_desc_zero(desc);
return err;
}
EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
int crypto_shash_export(struct shash_desc *desc, void *out)
{
struct crypto_shash *tfm = desc->tfm;
struct shash_alg *shash = crypto_shash_alg(tfm);
if (shash->export)
return shash->export(desc, out);
memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm));
return 0;
}
EXPORT_SYMBOL_GPL(crypto_shash_export);
int crypto_shash_import(struct shash_desc *desc, const void *in)
{
struct crypto_shash *tfm = desc->tfm;
struct shash_alg *shash = crypto_shash_alg(tfm);
if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
return -ENOKEY;
if (shash->import)
return shash->import(desc, in);
memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
return 0;
}
EXPORT_SYMBOL_GPL(crypto_shash_import);
static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_shash *hash = __crypto_shash_cast(tfm);
struct shash_alg *alg = crypto_shash_alg(hash);
alg->exit_tfm(hash);
}
static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_shash *hash = __crypto_shash_cast(tfm);
struct shash_alg *alg = crypto_shash_alg(hash);
int err;
hash->descsize = alg->descsize;
shash_set_needkey(hash, alg);
if (alg->exit_tfm)
tfm->exit = crypto_shash_exit_tfm;
if (!alg->init_tfm)
return 0;
err = alg->init_tfm(hash);
if (err)
return err;
/* ->init_tfm() may have increased the descsize. */
if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
if (alg->exit_tfm)
alg->exit_tfm(hash);
return -EINVAL;
}
return 0;
}
static void crypto_shash_free_instance(struct crypto_instance *inst)
{
struct shash_instance *shash = shash_instance(inst);
shash->free(shash);
}
static int __maybe_unused crypto_shash_report(
struct sk_buff *skb, struct crypto_alg *alg)
{
struct crypto_report_hash rhash;
struct shash_alg *salg = __crypto_shash_alg(alg);
memset(&rhash, 0, sizeof(rhash));
strscpy(rhash.type, "shash", sizeof(rhash.type));
rhash.blocksize = alg->cra_blocksize;
rhash.digestsize = salg->digestsize;
return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
}
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
__maybe_unused;
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
{
struct shash_alg *salg = __crypto_shash_alg(alg);
seq_printf(m, "type : shash\n");
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
seq_printf(m, "digestsize : %u\n", salg->digestsize);
}
static int __maybe_unused crypto_shash_report_stat(
struct sk_buff *skb, struct crypto_alg *alg)
{
return crypto_hash_report_stat(skb, alg, "shash");
}
const struct crypto_type crypto_shash_type = {
.extsize = crypto_alg_extsize,
.init_tfm = crypto_shash_init_tfm,
.free = crypto_shash_free_instance,
#ifdef CONFIG_PROC_FS
.show = crypto_shash_show,
#endif
#if IS_ENABLED(CONFIG_CRYPTO_USER)
.report = crypto_shash_report,
#endif
#ifdef CONFIG_CRYPTO_STATS
.report_stat = crypto_shash_report_stat,
#endif
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
.maskset = CRYPTO_ALG_TYPE_MASK,
.type = CRYPTO_ALG_TYPE_SHASH,
.tfmsize = offsetof(struct crypto_shash, base),
};
int crypto_grab_shash(struct crypto_shash_spawn *spawn,
struct crypto_instance *inst,
const char *name, u32 type, u32 mask)
{
spawn->base.frontend = &crypto_shash_type;
return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_shash);
struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
u32 mask)
{
return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_shash);
int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
{
return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_has_shash);
struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash)
{
struct crypto_tfm *tfm = crypto_shash_tfm(hash);
struct shash_alg *alg = crypto_shash_alg(hash);
struct crypto_shash *nhash;
int err;
if (!crypto_shash_alg_has_setkey(alg)) {
tfm = crypto_tfm_get(tfm);
if (IS_ERR(tfm))
return ERR_CAST(tfm);
return hash;
}
if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init))
return ERR_PTR(-ENOSYS);
nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
if (IS_ERR(nhash))
return nhash;
nhash->descsize = hash->descsize;
if (alg->clone_tfm) {
err = alg->clone_tfm(nhash, hash);
if (err) {
crypto_free_shash(nhash);
return ERR_PTR(err);
}
}
return nhash;
}
EXPORT_SYMBOL_GPL(crypto_clone_shash);
int hash_prepare_alg(struct hash_alg_common *alg)
{
struct crypto_istat_hash *istat = hash_get_stat(alg);
struct crypto_alg *base = &alg->base;
if (alg->digestsize > HASH_MAX_DIGESTSIZE)
return -EINVAL;
/* alignmask is not useful for hashes, so it is not supported. */
if (base->cra_alignmask)
return -EINVAL;
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
if (IS_ENABLED(CONFIG_CRYPTO_STATS))
memset(istat, 0, sizeof(*istat));
return 0;
}
static int shash_prepare_alg(struct shash_alg *alg)
{
struct crypto_alg *base = &alg->halg.base;
int err;
if (alg->descsize > HASH_MAX_DESCSIZE)
return -EINVAL;
if ((alg->export && !alg->import) || (alg->import && !alg->export))
return -EINVAL;
err = hash_prepare_alg(&alg->halg);
if (err)
return err;
base->cra_type = &crypto_shash_type;
base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
/*
* Handle missing optional functions. For each one we can either
* install a default here, or we can leave the pointer as NULL and check
* the pointer for NULL in crypto_shash_*(), avoiding an indirect call
* when the default behavior is desired. For ->finup and ->digest we
* install defaults, since for optimal performance algorithms should
* implement these anyway. On the other hand, for ->import and
* ->export the common case and best performance comes from the simple
* memcpy of the shash_desc_ctx, so when those pointers are NULL we
* leave them NULL and provide the memcpy with no indirect call.
*/
if (!alg->finup)
alg->finup = shash_default_finup;
if (!alg->digest)
alg->digest = shash_default_digest;
if (!alg->export)
alg->halg.statesize = alg->descsize;
if (!alg->setkey)
alg->setkey = shash_no_setkey;
return 0;
}
int crypto_register_shash(struct shash_alg *alg)
{
struct crypto_alg *base = &alg->base;
int err;
err = shash_prepare_alg(alg);
if (err)
return err;
return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_shash);
void crypto_unregister_shash(struct shash_alg *alg)
{
crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_shash);
int crypto_register_shashes(struct shash_alg *algs, int count)
{
int i, ret;
for (i = 0; i < count; i++) {
ret = crypto_register_shash(&algs[i]);
if (ret)
goto err;
}
return 0;
err:
for (--i; i >= 0; --i)
crypto_unregister_shash(&algs[i]);
return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_shashes);
void crypto_unregister_shashes(struct shash_alg *algs, int count)
{
int i;
for (i = count - 1; i >= 0; --i)
crypto_unregister_shash(&algs[i]);
}
EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
int shash_register_instance(struct crypto_template *tmpl,
struct shash_instance *inst)
{
int err;
if (WARN_ON(!inst->free))
return -EINVAL;
err = shash_prepare_alg(&inst->alg);
if (err)
return err;
return crypto_register_instance(tmpl, shash_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(shash_register_instance);
void shash_free_singlespawn_instance(struct shash_instance *inst)
{
crypto_drop_spawn(shash_instance_ctx(inst));
kfree(inst);
}
EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Synchronous cryptographic hash type");