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crypto: skcipher - Add lskcipher

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Add a new API type lskcipher designed for taking straight kernel
pointers instead of SG lists.  Its relationship to skcipher will
be analogous to that between shash and ahash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
2023-09-14 16:28:24 +08:00
parent b64d143b75
commit 31865c4c4d
8 changed files with 1086 additions and 45 deletions
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75
crypto/skcipher.c
View File

@@ -24,8 +24,9 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <net/netlink.h>
#include "skcipher.h"
#include "internal.h"
#define CRYPTO_ALG_TYPE_SKCIPHER_MASK 0x0000000e
enum {
SKCIPHER_WALK_PHYS = 1 << 0,
@@ -43,6 +44,8 @@ struct skcipher_walk_buffer {
u8 buffer[];
};
static const struct crypto_type crypto_skcipher_type;
static int skcipher_walk_next(struct skcipher_walk *walk);
static inline void skcipher_map_src(struct skcipher_walk *walk)
@@ -89,11 +92,7 @@ static inline struct skcipher_alg *__crypto_skcipher_alg(
static inline struct crypto_istat_cipher *skcipher_get_stat(
struct skcipher_alg *alg)
{
#ifdef CONFIG_CRYPTO_STATS
return &alg->stat;
#else
return NULL;
#endif
return skcipher_get_stat_common(&alg->co);
}
static inline int crypto_skcipher_errstat(struct skcipher_alg *alg, int err)
@@ -468,6 +467,7 @@ static int skcipher_walk_skcipher(struct skcipher_walk *walk,
struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
walk->total = req->cryptlen;
walk->nbytes = 0;
@@ -485,10 +485,14 @@ static int skcipher_walk_skcipher(struct skcipher_walk *walk,
SKCIPHER_WALK_SLEEP : 0;
walk->blocksize = crypto_skcipher_blocksize(tfm);
walk->stride = crypto_skcipher_walksize(tfm);
walk->ivsize = crypto_skcipher_ivsize(tfm);
walk->alignmask = crypto_skcipher_alignmask(tfm);
if (alg->co.base.cra_type != &crypto_skcipher_type)
walk->stride = alg->co.chunksize;
else
walk->stride = alg->walksize;
return skcipher_walk_first(walk);
}
@@ -616,6 +620,11 @@ int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned long alignmask = crypto_skcipher_alignmask(tfm);
int err;
if (cipher->co.base.cra_type != &crypto_skcipher_type) {
err = crypto_lskcipher_setkey_sg(tfm, key, keylen);
goto out;
}
if (keylen < cipher->min_keysize || keylen > cipher->max_keysize)
return -EINVAL;
@@ -624,6 +633,7 @@ int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
else
err = cipher->setkey(tfm, key, keylen);
out:
if (unlikely(err)) {
skcipher_set_needkey(tfm);
return err;
@@ -649,6 +659,8 @@ int crypto_skcipher_encrypt(struct skcipher_request *req)
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
ret = -ENOKEY;
else if (alg->co.base.cra_type != &crypto_skcipher_type)
ret = crypto_lskcipher_encrypt_sg(req);
else
ret = alg->encrypt(req);
@@ -671,6 +683,8 @@ int crypto_skcipher_decrypt(struct skcipher_request *req)
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
ret = -ENOKEY;
else if (alg->co.base.cra_type != &crypto_skcipher_type)
ret = crypto_lskcipher_decrypt_sg(req);
else
ret = alg->decrypt(req);
@@ -693,6 +707,9 @@ static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
skcipher_set_needkey(skcipher);
if (tfm->__crt_alg->cra_type != &crypto_skcipher_type)
return crypto_init_lskcipher_ops_sg(tfm);
if (alg->exit)
skcipher->base.exit = crypto_skcipher_exit_tfm;
@@ -702,6 +719,14 @@ static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
return 0;
}
static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg)
{
if (alg->cra_type != &crypto_skcipher_type)
return sizeof(struct crypto_lskcipher *);
return crypto_alg_extsize(alg);
}
static void crypto_skcipher_free_instance(struct crypto_instance *inst)
{
struct skcipher_instance *skcipher =
@@ -770,7 +795,7 @@ static int __maybe_unused crypto_skcipher_report_stat(
}
static const struct crypto_type crypto_skcipher_type = {
.extsize = crypto_alg_extsize,
.extsize = crypto_skcipher_extsize,
.init_tfm = crypto_skcipher_init_tfm,
.free = crypto_skcipher_free_instance,
#ifdef CONFIG_PROC_FS
@@ -783,7 +808,7 @@ static const struct crypto_type crypto_skcipher_type = {
.report_stat = crypto_skcipher_report_stat,
#endif
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
.maskset = CRYPTO_ALG_TYPE_MASK,
.maskset = CRYPTO_ALG_TYPE_SKCIPHER_MASK,
.type = CRYPTO_ALG_TYPE_SKCIPHER,
.tfmsize = offsetof(struct crypto_skcipher, base),
};
@@ -834,27 +859,43 @@ int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask)
}
EXPORT_SYMBOL_GPL(crypto_has_skcipher);
static int skcipher_prepare_alg(struct skcipher_alg *alg)
int skcipher_prepare_alg_common(struct skcipher_alg_common *alg)
{
struct crypto_istat_cipher *istat = skcipher_get_stat(alg);
struct crypto_istat_cipher *istat = skcipher_get_stat_common(alg);
struct crypto_alg *base = &alg->base;
if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 ||
alg->walksize > PAGE_SIZE / 8)
if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8)
return -EINVAL;
if (!alg->chunksize)
alg->chunksize = base->cra_blocksize;
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
if (IS_ENABLED(CONFIG_CRYPTO_STATS))
memset(istat, 0, sizeof(*istat));
return 0;
}
static int skcipher_prepare_alg(struct skcipher_alg *alg)
{
struct crypto_alg *base = &alg->base;
int err;
err = skcipher_prepare_alg_common(&alg->co);
if (err)
return err;
if (alg->walksize > PAGE_SIZE / 8)
return -EINVAL;
if (!alg->walksize)
alg->walksize = alg->chunksize;
base->cra_type = &crypto_skcipher_type;
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
if (IS_ENABLED(CONFIG_CRYPTO_STATS))
memset(istat, 0, sizeof(*istat));
return 0;
}