mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 06:04:23 +08:00
crypto: skcipher - Make use of internal state
This patch adds code to the skcipher/lskcipher API to make use of the internal state if present. In particular, the skcipher lskcipher wrapper will allocate a buffer for the IV/state and feed that to the underlying lskcipher algorithm. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
0ae4dcc1eb
commit
662ea18d08
@ -90,6 +90,7 @@ static int crypto_lskcipher_crypt_unaligned(
|
||||
u8 *iv, int (*crypt)(struct crypto_lskcipher *tfm, const u8 *src,
|
||||
u8 *dst, unsigned len, u8 *iv, u32 flags))
|
||||
{
|
||||
unsigned statesize = crypto_lskcipher_statesize(tfm);
|
||||
unsigned ivsize = crypto_lskcipher_ivsize(tfm);
|
||||
unsigned bs = crypto_lskcipher_blocksize(tfm);
|
||||
unsigned cs = crypto_lskcipher_chunksize(tfm);
|
||||
@ -104,7 +105,7 @@ static int crypto_lskcipher_crypt_unaligned(
|
||||
if (!tiv)
|
||||
return -ENOMEM;
|
||||
|
||||
memcpy(tiv, iv, ivsize);
|
||||
memcpy(tiv, iv, ivsize + statesize);
|
||||
|
||||
p = kmalloc(PAGE_SIZE, GFP_ATOMIC);
|
||||
err = -ENOMEM;
|
||||
@ -132,7 +133,7 @@ static int crypto_lskcipher_crypt_unaligned(
|
||||
err = len ? -EINVAL : 0;
|
||||
|
||||
out:
|
||||
memcpy(iv, tiv, ivsize);
|
||||
memcpy(iv, tiv, ivsize + statesize);
|
||||
kfree_sensitive(p);
|
||||
kfree_sensitive(tiv);
|
||||
return err;
|
||||
@ -197,25 +198,45 @@ EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt);
|
||||
static int crypto_lskcipher_crypt_sg(struct skcipher_request *req,
|
||||
int (*crypt)(struct crypto_lskcipher *tfm,
|
||||
const u8 *src, u8 *dst,
|
||||
unsigned len, u8 *iv,
|
||||
unsigned len, u8 *ivs,
|
||||
u32 flags))
|
||||
{
|
||||
struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
|
||||
struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
|
||||
u8 *ivs = skcipher_request_ctx(req);
|
||||
struct crypto_lskcipher *tfm = *ctx;
|
||||
struct skcipher_walk walk;
|
||||
unsigned ivsize;
|
||||
u32 flags;
|
||||
int err;
|
||||
|
||||
ivsize = crypto_lskcipher_ivsize(tfm);
|
||||
ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1);
|
||||
|
||||
flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
|
||||
if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT)
|
||||
flags |= CRYPTO_LSKCIPHER_FLAG_CONT;
|
||||
else
|
||||
memcpy(ivs, req->iv, ivsize);
|
||||
|
||||
if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL))
|
||||
flags |= CRYPTO_LSKCIPHER_FLAG_FINAL;
|
||||
|
||||
err = skcipher_walk_virt(&walk, req, false);
|
||||
|
||||
while (walk.nbytes) {
|
||||
err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr,
|
||||
walk.nbytes, walk.iv,
|
||||
walk.nbytes == walk.total ?
|
||||
CRYPTO_LSKCIPHER_FLAG_FINAL : 0);
|
||||
walk.nbytes, ivs,
|
||||
flags & ~(walk.nbytes == walk.total ?
|
||||
0 : CRYPTO_LSKCIPHER_FLAG_FINAL));
|
||||
err = skcipher_walk_done(&walk, err);
|
||||
flags |= CRYPTO_LSKCIPHER_FLAG_CONT;
|
||||
}
|
||||
|
||||
if (flags & CRYPTO_LSKCIPHER_FLAG_FINAL)
|
||||
memcpy(req->iv, ivs, ivsize);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
@ -278,6 +299,7 @@ static void __maybe_unused crypto_lskcipher_show(
|
||||
seq_printf(m, "max keysize : %u\n", skcipher->co.max_keysize);
|
||||
seq_printf(m, "ivsize : %u\n", skcipher->co.ivsize);
|
||||
seq_printf(m, "chunksize : %u\n", skcipher->co.chunksize);
|
||||
seq_printf(m, "statesize : %u\n", skcipher->co.statesize);
|
||||
}
|
||||
|
||||
static int __maybe_unused crypto_lskcipher_report(
|
||||
|
||||
@ -698,6 +698,64 @@ int crypto_skcipher_decrypt(struct skcipher_request *req)
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt);
|
||||
|
||||
static int crypto_lskcipher_export(struct skcipher_request *req, void *out)
|
||||
{
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
u8 *ivs = skcipher_request_ctx(req);
|
||||
|
||||
ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1);
|
||||
|
||||
memcpy(out, ivs + crypto_skcipher_ivsize(tfm),
|
||||
crypto_skcipher_statesize(tfm));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int crypto_lskcipher_import(struct skcipher_request *req, const void *in)
|
||||
{
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
u8 *ivs = skcipher_request_ctx(req);
|
||||
|
||||
ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1);
|
||||
|
||||
memcpy(ivs + crypto_skcipher_ivsize(tfm), in,
|
||||
crypto_skcipher_statesize(tfm));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int skcipher_noexport(struct skcipher_request *req, void *out)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int skcipher_noimport(struct skcipher_request *req, const void *in)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
int crypto_skcipher_export(struct skcipher_request *req, void *out)
|
||||
{
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
|
||||
|
||||
if (alg->co.base.cra_type != &crypto_skcipher_type)
|
||||
return crypto_lskcipher_export(req, out);
|
||||
return alg->export(req, out);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(crypto_skcipher_export);
|
||||
|
||||
int crypto_skcipher_import(struct skcipher_request *req, const void *in)
|
||||
{
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
|
||||
|
||||
if (alg->co.base.cra_type != &crypto_skcipher_type)
|
||||
return crypto_lskcipher_import(req, in);
|
||||
return alg->import(req, in);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(crypto_skcipher_import);
|
||||
|
||||
static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
|
||||
@ -713,8 +771,17 @@ static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
|
||||
|
||||
skcipher_set_needkey(skcipher);
|
||||
|
||||
if (tfm->__crt_alg->cra_type != &crypto_skcipher_type)
|
||||
if (tfm->__crt_alg->cra_type != &crypto_skcipher_type) {
|
||||
unsigned am = crypto_skcipher_alignmask(skcipher);
|
||||
unsigned reqsize;
|
||||
|
||||
reqsize = am & ~(crypto_tfm_ctx_alignment() - 1);
|
||||
reqsize += crypto_skcipher_ivsize(skcipher);
|
||||
reqsize += crypto_skcipher_statesize(skcipher);
|
||||
crypto_skcipher_set_reqsize(skcipher, reqsize);
|
||||
|
||||
return crypto_init_lskcipher_ops_sg(tfm);
|
||||
}
|
||||
|
||||
if (alg->exit)
|
||||
skcipher->base.exit = crypto_skcipher_exit_tfm;
|
||||
@ -756,6 +823,7 @@ static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
|
||||
seq_printf(m, "ivsize : %u\n", skcipher->ivsize);
|
||||
seq_printf(m, "chunksize : %u\n", skcipher->chunksize);
|
||||
seq_printf(m, "walksize : %u\n", skcipher->walksize);
|
||||
seq_printf(m, "statesize : %u\n", skcipher->statesize);
|
||||
}
|
||||
|
||||
static int __maybe_unused crypto_skcipher_report(
|
||||
@ -870,7 +938,9 @@ int skcipher_prepare_alg_common(struct skcipher_alg_common *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)
|
||||
if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 ||
|
||||
alg->statesize > PAGE_SIZE / 2 ||
|
||||
(alg->ivsize + alg->statesize) > PAGE_SIZE / 2)
|
||||
return -EINVAL;
|
||||
|
||||
if (!alg->chunksize)
|
||||
@ -899,6 +969,12 @@ static int skcipher_prepare_alg(struct skcipher_alg *alg)
|
||||
if (!alg->walksize)
|
||||
alg->walksize = alg->chunksize;
|
||||
|
||||
if (!alg->statesize) {
|
||||
alg->import = skcipher_noimport;
|
||||
alg->export = skcipher_noexport;
|
||||
} else if (!(alg->import && alg->export))
|
||||
return -EINVAL;
|
||||
|
||||
base->cra_type = &crypto_skcipher_type;
|
||||
base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
|
||||
|
||||
|
||||
@ -746,6 +746,39 @@ int crypto_skcipher_encrypt(struct skcipher_request *req);
|
||||
*/
|
||||
int crypto_skcipher_decrypt(struct skcipher_request *req);
|
||||
|
||||
/**
|
||||
* crypto_skcipher_export() - export partial state
|
||||
* @req: reference to the skcipher_request handle that holds all information
|
||||
* needed to perform the operation
|
||||
* @out: output buffer of sufficient size that can hold the state
|
||||
*
|
||||
* Export partial state of the transformation. This function dumps the
|
||||
* entire state of the ongoing transformation into a provided block of
|
||||
* data so it can be @import 'ed back later on. This is useful in case
|
||||
* you want to save partial result of the transformation after
|
||||
* processing certain amount of data and reload this partial result
|
||||
* multiple times later on for multiple re-use. No data processing
|
||||
* happens at this point.
|
||||
*
|
||||
* Return: 0 if the cipher operation was successful; < 0 if an error occurred
|
||||
*/
|
||||
int crypto_skcipher_export(struct skcipher_request *req, void *out);
|
||||
|
||||
/**
|
||||
* crypto_skcipher_import() - import partial state
|
||||
* @req: reference to the skcipher_request handle that holds all information
|
||||
* needed to perform the operation
|
||||
* @in: buffer holding the state
|
||||
*
|
||||
* Import partial state of the transformation. This function loads the
|
||||
* entire state of the ongoing transformation from a provided block of
|
||||
* data so the transformation can continue from this point onward. No
|
||||
* data processing happens at this point.
|
||||
*
|
||||
* Return: 0 if the cipher operation was successful; < 0 if an error occurred
|
||||
*/
|
||||
int crypto_skcipher_import(struct skcipher_request *req, const void *in);
|
||||
|
||||
/**
|
||||
* crypto_lskcipher_encrypt() - encrypt plaintext
|
||||
* @tfm: lskcipher handle
|
||||
|
||||
Loading…
Reference in New Issue
Block a user