[v3 PATCH 8/16] crypto: pcbc - Convert to skcipher

Herbert Xu
2016-11-22T12:08:46Z

This patch converts lrw over to the skcipher interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

crypto/pcbc.c | 201 +++++++++++++++++++++++++++++++---------------------------
1 file changed, 109 insertions(+), 92 deletions(-)

diff --git a/crypto/pcbc.c b/crypto/pcbc.c
index f654965..e4538e0 100644
--- a/crypto/pcbc.c
+++ b/crypto/pcbc.c
@@ -14,40 +14,37 @@
*
*/

-#include <crypto/algapi.h>
+#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/scatterlist.h>
#include <linux/slab.h>

struct crypto_pcbc_ctx {
struct crypto_cipher *child;
};

-static int crypto_pcbc_setkey(struct crypto_tfm *parent, const u8 *key,
+static int crypto_pcbc_setkey(struct crypto_skcipher *parent, const u8 *key,
unsigned int keylen)
{
- struct crypto_pcbc_ctx *ctx = crypto_tfm_ctx(parent);
+ struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(parent);
struct crypto_cipher *child = ctx->child;
int err;

crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
- crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
- CRYPTO_TFM_REQ_MASK);
+ crypto_cipher_set_flags(child, crypto_skcipher_get_flags(parent) &
+ CRYPTO_TFM_REQ_MASK);
err = crypto_cipher_setkey(child, key, keylen);
- crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
- CRYPTO_TFM_RES_MASK);
+ crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(child) &
+ CRYPTO_TFM_RES_MASK);
return err;
}

-static int crypto_pcbc_encrypt_segment(struct blkcipher_desc *desc,
- struct blkcipher_walk *walk,
+static int crypto_pcbc_encrypt_segment(struct skcipher_request *req,
+ struct skcipher_walk *walk,
struct crypto_cipher *tfm)
{
- void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
- crypto_cipher_alg(tfm)->cia_encrypt;
int bsize = crypto_cipher_blocksize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
@@ -56,7 +53,7 @@ static int crypto_pcbc_encrypt_segment(struct blkcipher_desc *desc,

do {
crypto_xor(iv, src, bsize);
- fn(crypto_cipher_tfm(tfm), dst, iv);
+ crypto_cipher_encrypt_one(tfm, dst, iv);
memcpy(iv, dst, bsize);
crypto_xor(iv, src, bsize);

@@ -67,12 +64,10 @@ static int crypto_pcbc_encrypt_segment(struct blkcipher_desc *desc,
return nbytes;
}

-static int crypto_pcbc_encrypt_inplace(struct blkcipher_desc *desc,
- struct blkcipher_walk *walk,
+static int crypto_pcbc_encrypt_inplace(struct skcipher_request *req,
+ struct skcipher_walk *walk,
struct crypto_cipher *tfm)
{
- void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
- crypto_cipher_alg(tfm)->cia_encrypt;
int bsize = crypto_cipher_blocksize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
@@ -82,7 +77,7 @@ static int crypto_pcbc_encrypt_inplace(struct blkcipher_desc *desc,
do {
memcpy(tmpbuf, src, bsize);
crypto_xor(iv, src, bsize);
- fn(crypto_cipher_tfm(tfm), src, iv);
+ crypto_cipher_encrypt_one(tfm, src, iv);
memcpy(iv, tmpbuf, bsize);
crypto_xor(iv, src, bsize);

@@ -94,38 +89,34 @@ static int crypto_pcbc_encrypt_inplace(struct blkcipher_desc *desc,
return nbytes;
}

-static int crypto_pcbc_encrypt(struct blkcipher_desc *desc,
- struct scatterlist *dst, struct scatterlist *src,
- unsigned int nbytes)
+static int crypto_pcbc_encrypt(struct skcipher_request *req)
{
- struct blkcipher_walk walk;
- struct crypto_blkcipher *tfm = desc->tfm;
- struct crypto_pcbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_cipher *child = ctx->child;
+ struct skcipher_walk walk;
+ unsigned int nbytes;
int err;

- blkcipher_walk_init(&walk, dst, src, nbytes);
- err = blkcipher_walk_virt(desc, &walk);
+ err = skcipher_walk_virt(&walk, req, false);

while ((nbytes = walk.nbytes)) {
if (walk.src.virt.addr == walk.dst.virt.addr)
- nbytes = crypto_pcbc_encrypt_inplace(desc, &walk,
+ nbytes = crypto_pcbc_encrypt_inplace(req, &walk,
child);
else
- nbytes = crypto_pcbc_encrypt_segment(desc, &walk,
+ nbytes = crypto_pcbc_encrypt_segment(req, &walk,
child);
- err = blkcipher_walk_done(desc, &walk, nbytes);
+ err = skcipher_walk_done(&walk, nbytes);
}

return err;
}

-static int crypto_pcbc_decrypt_segment(struct blkcipher_desc *desc,
- struct blkcipher_walk *walk,
+static int crypto_pcbc_decrypt_segment(struct skcipher_request *req,
+ struct skcipher_walk *walk,
struct crypto_cipher *tfm)
{
- void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
- crypto_cipher_alg(tfm)->cia_decrypt;
int bsize = crypto_cipher_blocksize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
@@ -133,7 +124,7 @@ static int crypto_pcbc_decrypt_segment(struct blkcipher_desc *desc,
u8 *iv = walk->iv;

do {
- fn(crypto_cipher_tfm(tfm), dst, src);
+ crypto_cipher_decrypt_one(tfm, dst, src);
crypto_xor(dst, iv, bsize);
memcpy(iv, src, bsize);
crypto_xor(iv, dst, bsize);
@@ -147,21 +138,19 @@ static int crypto_pcbc_decrypt_segment(struct blkcipher_desc *desc,
return nbytes;
}

-static int crypto_pcbc_decrypt_inplace(struct blkcipher_desc *desc,
- struct blkcipher_walk *walk,
+static int crypto_pcbc_decrypt_inplace(struct skcipher_request *req,
+ struct skcipher_walk *walk,
struct crypto_cipher *tfm)
{
- void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
- crypto_cipher_alg(tfm)->cia_decrypt;
int bsize = crypto_cipher_blocksize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
u8 *iv = walk->iv;
- u8 tmpbuf[bsize];
+ u8 tmpbuf[bsize] __attribute__ ((aligned(__alignof__(u32))));

do {
memcpy(tmpbuf, src, bsize);
- fn(crypto_cipher_tfm(tfm), src, src);
+ crypto_cipher_decrypt_one(tfm, src, src);
crypto_xor(src, iv, bsize);
memcpy(iv, tmpbuf, bsize);
crypto_xor(iv, src, bsize);
@@ -174,37 +163,35 @@ static int crypto_pcbc_decrypt_inplace(struct blkcipher_desc *desc,
return nbytes;
}

-static int crypto_pcbc_decrypt(struct blkcipher_desc *desc,
- struct scatterlist *dst, struct scatterlist *src,
- unsigned int nbytes)
+static int crypto_pcbc_decrypt(struct skcipher_request *req)
{
- struct blkcipher_walk walk;
- struct crypto_blkcipher *tfm = desc->tfm;
- struct crypto_pcbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_cipher *child = ctx->child;
+ struct skcipher_walk walk;
+ unsigned int nbytes;
int err;

- blkcipher_walk_init(&walk, dst, src, nbytes);
- err = blkcipher_walk_virt(desc, &walk);
+ err = skcipher_walk_virt(&walk, req, false);

while ((nbytes = walk.nbytes)) {
if (walk.src.virt.addr == walk.dst.virt.addr)
- nbytes = crypto_pcbc_decrypt_inplace(desc, &walk,
+ nbytes = crypto_pcbc_decrypt_inplace(req, &walk,
child);
else
- nbytes = crypto_pcbc_decrypt_segment(desc, &walk,
+ nbytes = crypto_pcbc_decrypt_segment(req, &walk,
child);
- err = blkcipher_walk_done(desc, &walk, nbytes);
+ err = skcipher_walk_done(&walk, nbytes);
}

return err;
}

-static int crypto_pcbc_init_tfm(struct crypto_tfm *tfm)
+static int crypto_pcbc_init_tfm(struct crypto_skcipher *tfm)
{
- struct crypto_instance *inst = (void *)tfm->__crt_alg;
- struct crypto_spawn *spawn = crypto_instance_ctx(inst);
- struct crypto_pcbc_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct skcipher_instance *inst = skcipher_alg_instance(tfm);
+ struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
+ struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_cipher *cipher;

cipher = crypto_spawn_cipher(spawn);
@@ -215,68 +202,98 @@ static int crypto_pcbc_init_tfm(struct crypto_tfm *tfm)
return 0;
}

-static void crypto_pcbc_exit_tfm(struct crypto_tfm *tfm)
+static void crypto_pcbc_exit_tfm(struct crypto_skcipher *tfm)
{
- struct crypto_pcbc_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
+
crypto_free_cipher(ctx->child);
}

-static struct crypto_instance *crypto_pcbc_alloc(struct rtattr **tb)
+static void crypto_pcbc_free(struct skcipher_instance *inst)
+{
+ crypto_drop_skcipher(skcipher_instance_ctx(inst));
+ kfree(inst);
+}
+
+static int crypto_pcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
{
- struct crypto_instance *inst;
+ struct skcipher_instance *inst;
+ struct crypto_attr_type *algt;
+ struct crypto_spawn *spawn;
struct crypto_alg *alg;
int err;

- err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
- if (err)
- return ERR_PTR(err);
+ algt = crypto_get_attr_type(tb);
+ if (IS_ERR(algt))
+ return PTR_ERR(algt);
+
+ if (((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) &
+ ~CRYPTO_ALG_INTERNAL)
+ return -EINVAL;

- alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
- CRYPTO_ALG_TYPE_MASK);
+ inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+ if (!inst)
+ return -ENOMEM;
+
+ alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER |
+ (algt->type & CRYPTO_ALG_INTERNAL),
+ CRYPTO_ALG_TYPE_MASK |
+ (algt->mask & CRYPTO_ALG_INTERNAL));
+ err = PTR_ERR(alg);
if (IS_ERR(alg))
- return ERR_CAST(alg);
+ goto err_free_inst;
+
+ spawn = skcipher_instance_ctx(inst);
+ err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst),
+ CRYPTO_ALG_TYPE_MASK);
+ crypto_mod_put(alg);
+ if (err)
+ goto err_free_inst;

- inst = crypto_alloc_instance("pcbc", alg);
- if (IS_ERR(inst))
- goto out_put_alg;
+ err = crypto_inst_setname(skcipher_crypto_instance(inst), "pcbc", alg);
+ if (err)
+ goto err_drop_spawn;

- inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
- inst->alg.cra_priority = alg->cra_priority;
- inst->alg.cra_blocksize = alg->cra_blocksize;
- inst->alg.cra_alignmask = alg->cra_alignmask;
- inst->alg.cra_type = &crypto_blkcipher_type;
+ inst->alg.base.cra_flags = alg->cra_flags & CRYPTO_ALG_INTERNAL;
+ inst->alg.base.cra_priority = alg->cra_priority;
+ inst->alg.base.cra_blocksize = alg->cra_blocksize;
+ inst->alg.base.cra_alignmask = alg->cra_alignmask;

/* We access the data as u32s when xoring. */
- inst->alg.cra_alignmask |= __alignof__(u32) - 1;
+ inst->alg.base.cra_alignmask |= __alignof__(u32) - 1;

- inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
- inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
- inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
+ inst->alg.ivsize = alg->cra_blocksize;
+ inst->alg.min_keysize = alg->cra_cipher.cia_min_keysize;
+ inst->alg.max_keysize = alg->cra_cipher.cia_max_keysize;

- inst->alg.cra_ctxsize = sizeof(struct crypto_pcbc_ctx);
+ inst->alg.base.cra_ctxsize = sizeof(struct crypto_pcbc_ctx);

- inst->alg.cra_init = crypto_pcbc_init_tfm;
- inst->alg.cra_exit = crypto_pcbc_exit_tfm;
+ inst->alg.init = crypto_pcbc_init_tfm;
+ inst->alg.exit = crypto_pcbc_exit_tfm;

- inst->alg.cra_blkcipher.setkey = crypto_pcbc_setkey;
- inst->alg.cra_blkcipher.encrypt = crypto_pcbc_encrypt;
- inst->alg.cra_blkcipher.decrypt = crypto_pcbc_decrypt;
+ inst->alg.setkey = crypto_pcbc_setkey;
+ inst->alg.encrypt = crypto_pcbc_encrypt;
+ inst->alg.decrypt = crypto_pcbc_decrypt;

-out_put_alg:
- crypto_mod_put(alg);
- return inst;
-}
+ inst->free = crypto_pcbc_free;

-static void crypto_pcbc_free(struct crypto_instance *inst)
-{
- crypto_drop_spawn(crypto_instance_ctx(inst));
+ err = skcipher_register_instance(tmpl, inst);
+ if (err)
+ goto err_drop_spawn;
+
+out:
+ return err;
+
+err_drop_spawn:
+ crypto_drop_spawn(spawn);
+err_free_inst:
kfree(inst);
+ goto out;
}

static struct crypto_template crypto_pcbc_tmpl = {
.name = "pcbc",
- .alloc = crypto_pcbc_alloc,
- .free = crypto_pcbc_free,
+ .create = crypto_pcbc_create,
.module = THIS_MODULE,
};