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authorHerbert Xu <herbert@gondor.apana.org.au>2023-11-28 14:33:19 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2023-12-08 11:59:46 +0800
commit662ea18d089ba6fa02859fbd64f2aa78d88c6648 (patch)
treec2e3651b30e2a421fb1be747352ec30771551787 /crypto/skcipher.c
parent0ae4dcc1ebf63118364d540b84c70352e8b2b2a4 (diff)
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>
Diffstat (limited to 'crypto/skcipher.c')
-rw-r--r--crypto/skcipher.c80
1 files changed, 78 insertions, 2 deletions
diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index ac8b8c042654..bc70e159d27d 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -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;