#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/compiler.h>
-
-struct crypto_pcbc_ctx {
- struct crypto_cipher *child;
-};
-
-static int crypto_pcbc_setkey(struct crypto_skcipher *parent, const u8 *key,
- unsigned int keylen)
-{
- 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_skcipher_get_flags(parent) &
- CRYPTO_TFM_REQ_MASK);
- err = crypto_cipher_setkey(child, key, keylen);
- crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(child) &
- CRYPTO_TFM_RES_MASK);
- return err;
-}
static int crypto_pcbc_encrypt_segment(struct skcipher_request *req,
struct skcipher_walk *walk,
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
u8 *dst = walk->dst.virt.addr;
- u8 *iv = walk->iv;
+ u8 * const iv = walk->iv;
do {
crypto_xor(iv, src, bsize);
int bsize = crypto_cipher_blocksize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
- u8 *iv = walk->iv;
+ u8 * const iv = walk->iv;
u8 tmpbuf[MAX_CIPHER_BLOCKSIZE];
do {
src += bsize;
} while ((nbytes -= bsize) >= bsize);
- memcpy(walk->iv, iv, bsize);
-
return nbytes;
}
static int crypto_pcbc_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct crypto_cipher *child = ctx->child;
+ struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
while ((nbytes = walk.nbytes)) {
if (walk.src.virt.addr == walk.dst.virt.addr)
nbytes = crypto_pcbc_encrypt_inplace(req, &walk,
- child);
+ cipher);
else
nbytes = crypto_pcbc_encrypt_segment(req, &walk,
- child);
+ cipher);
err = skcipher_walk_done(&walk, nbytes);
}
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
u8 *dst = walk->dst.virt.addr;
- u8 *iv = walk->iv;
+ u8 * const iv = walk->iv;
do {
crypto_cipher_decrypt_one(tfm, dst, src);
dst += bsize;
} while ((nbytes -= bsize) >= bsize);
- memcpy(walk->iv, iv, bsize);
-
return nbytes;
}
int bsize = crypto_cipher_blocksize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
- u8 *iv = walk->iv;
+ u8 * const iv = walk->iv;
u8 tmpbuf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(u32));
do {
src += bsize;
} while ((nbytes -= bsize) >= bsize);
- memcpy(walk->iv, iv, bsize);
-
return nbytes;
}
static int crypto_pcbc_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct crypto_cipher *child = ctx->child;
+ struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
while ((nbytes = walk.nbytes)) {
if (walk.src.virt.addr == walk.dst.virt.addr)
nbytes = crypto_pcbc_decrypt_inplace(req, &walk,
- child);
+ cipher);
else
nbytes = crypto_pcbc_decrypt_segment(req, &walk,
- child);
+ cipher);
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
-static int crypto_pcbc_init_tfm(struct crypto_skcipher *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);
- if (IS_ERR(cipher))
- return PTR_ERR(cipher);
-
- ctx->child = cipher;
- return 0;
-}
-
-static void crypto_pcbc_exit_tfm(struct crypto_skcipher *tfm)
-{
- struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
-
- crypto_free_cipher(ctx->child);
-}
-
-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 skcipher_instance *inst;
- struct crypto_attr_type *algt;
- struct crypto_spawn *spawn;
struct crypto_alg *alg;
int 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;
-
- 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))
- goto err_free_inst;
-
- spawn = skcipher_instance_ctx(inst);
- err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst),
- CRYPTO_ALG_TYPE_MASK);
- if (err)
- goto err_put_alg;
-
- err = crypto_inst_setname(skcipher_crypto_instance(inst), "pcbc", alg);
- if (err)
- goto err_drop_spawn;
+ inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+ if (IS_ERR(inst))
+ return PTR_ERR(inst);
- 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;
-
- 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.base.cra_ctxsize = sizeof(struct crypto_pcbc_ctx);
-
- inst->alg.init = crypto_pcbc_init_tfm;
- inst->alg.exit = crypto_pcbc_exit_tfm;
-
- inst->alg.setkey = crypto_pcbc_setkey;
inst->alg.encrypt = crypto_pcbc_encrypt;
inst->alg.decrypt = crypto_pcbc_decrypt;
- inst->free = crypto_pcbc_free;
-
err = skcipher_register_instance(tmpl, inst);
if (err)
- goto err_drop_spawn;
+ inst->free(inst);
crypto_mod_put(alg);
-
-out:
return err;
-
-err_drop_spawn:
- crypto_drop_spawn(spawn);
-err_put_alg:
- crypto_mod_put(alg);
-err_free_inst:
- kfree(inst);
- goto out;
}
static struct crypto_template crypto_pcbc_tmpl = {
module_exit(crypto_pcbc_module_exit);
MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("PCBC block cipher algorithm");
+MODULE_DESCRIPTION("PCBC block cipher mode of operation");
MODULE_ALIAS_CRYPTO("pcbc");
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