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crypto: ctr - Use skcipher in rfc3686 

This patch converts rfc3686 to use the new skcipher interface as
opposed to ablkcipher.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-07-12 13:17:37 +08:00
parent e75445a844
commit b2b39c2f97
1 changed files with 94 additions and 89 deletions
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183
crypto/ctr.c
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@ -26,13 +26,13 @@ struct crypto_ctr_ctx {
}; };
struct crypto_rfc3686_ctx { struct crypto_rfc3686_ctx {
struct crypto_ablkcipher *child; struct crypto_skcipher *child;
u8 nonce[CTR_RFC3686_NONCE_SIZE]; u8 nonce[CTR_RFC3686_NONCE_SIZE];
}; };
struct crypto_rfc3686_req_ctx { struct crypto_rfc3686_req_ctx {
u8 iv[CTR_RFC3686_BLOCK_SIZE]; u8 iv[CTR_RFC3686_BLOCK_SIZE];
struct ablkcipher_request subreq CRYPTO_MINALIGN_ATTR; struct skcipher_request subreq CRYPTO_MINALIGN_ATTR;
}; };
static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key, static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
@ -249,11 +249,11 @@ static struct crypto_template crypto_ctr_tmpl = {
.module = THIS_MODULE, .module = THIS_MODULE,
}; };
static int crypto_rfc3686_setkey(struct crypto_ablkcipher *parent, static int crypto_rfc3686_setkey(struct crypto_skcipher *parent,
const u8 *key, unsigned int keylen) const u8 *key, unsigned int keylen)
{ {
struct crypto_rfc3686_ctx *ctx = crypto_ablkcipher_ctx(parent); struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(parent);
struct crypto_ablkcipher *child = ctx->child; struct crypto_skcipher *child = ctx->child;
int err; int err;
/* the nonce is stored in bytes at end of key */ /* the nonce is stored in bytes at end of key */
@ -265,173 +265,178 @@ static int crypto_rfc3686_setkey(struct crypto_ablkcipher *parent,
keylen -= CTR_RFC3686_NONCE_SIZE; keylen -= CTR_RFC3686_NONCE_SIZE;
crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) & crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
CRYPTO_TFM_REQ_MASK); CRYPTO_TFM_REQ_MASK);
err = crypto_ablkcipher_setkey(child, key, keylen); err = crypto_skcipher_setkey(child, key, keylen);
crypto_ablkcipher_set_flags(parent, crypto_ablkcipher_get_flags(child) & crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
CRYPTO_TFM_RES_MASK); CRYPTO_TFM_RES_MASK);
return err; return err;
} }
static int crypto_rfc3686_crypt(struct ablkcipher_request *req) static int crypto_rfc3686_crypt(struct skcipher_request *req)
{ {
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct crypto_rfc3686_ctx *ctx = crypto_ablkcipher_ctx(tfm); struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_ablkcipher *child = ctx->child; struct crypto_skcipher *child = ctx->child;
unsigned long align = crypto_ablkcipher_alignmask(tfm); unsigned long align = crypto_skcipher_alignmask(tfm);
struct crypto_rfc3686_req_ctx *rctx = struct crypto_rfc3686_req_ctx *rctx =
(void *)PTR_ALIGN((u8 *)ablkcipher_request_ctx(req), align + 1); (void *)PTR_ALIGN((u8 *)skcipher_request_ctx(req), align + 1);
struct ablkcipher_request *subreq = &rctx->subreq; struct skcipher_request *subreq = &rctx->subreq;
u8 *iv = rctx->iv; u8 *iv = rctx->iv;
/* set up counter block */ /* set up counter block */
memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE); memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->info, CTR_RFC3686_IV_SIZE); memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->iv, CTR_RFC3686_IV_SIZE);
/* initialize counter portion of counter block */ /* initialize counter portion of counter block */
*(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) = *(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
cpu_to_be32(1); cpu_to_be32(1);
ablkcipher_request_set_tfm(subreq, child); skcipher_request_set_tfm(subreq, child);
ablkcipher_request_set_callback(subreq, req->base.flags, skcipher_request_set_callback(subreq, req->base.flags,
req->base.complete, req->base.data); req->base.complete, req->base.data);
ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->nbytes, skcipher_request_set_crypt(subreq, req->src, req->dst,
iv); req->cryptlen, iv);
return crypto_ablkcipher_encrypt(subreq); return crypto_skcipher_encrypt(subreq);
} }
static int crypto_rfc3686_init_tfm(struct crypto_tfm *tfm) static int crypto_rfc3686_init_tfm(struct crypto_skcipher *tfm)
{ {
struct crypto_instance *inst = (void *)tfm->__crt_alg; struct skcipher_instance *inst = skcipher_alg_instance(tfm);
struct crypto_skcipher_spawn *spawn = crypto_instance_ctx(inst); struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst);
struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm); struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_ablkcipher *cipher; struct crypto_skcipher *cipher;
unsigned long align; unsigned long align;
unsigned int reqsize;
cipher = crypto_spawn_skcipher(spawn); cipher = crypto_spawn_skcipher2(spawn);
if (IS_ERR(cipher)) if (IS_ERR(cipher))
return PTR_ERR(cipher); return PTR_ERR(cipher);
ctx->child = cipher; ctx->child = cipher;
align = crypto_tfm_alg_alignmask(tfm); align = crypto_skcipher_alignmask(tfm);
align &= ~(crypto_tfm_ctx_alignment() - 1); align &= ~(crypto_tfm_ctx_alignment() - 1);
tfm->crt_ablkcipher.reqsize = align + reqsize = align + sizeof(struct crypto_rfc3686_req_ctx) +
sizeof(struct crypto_rfc3686_req_ctx) + crypto_skcipher_reqsize(cipher);
crypto_ablkcipher_reqsize(cipher); crypto_skcipher_set_reqsize(tfm, reqsize);
return 0; return 0;
} }
static void crypto_rfc3686_exit_tfm(struct crypto_tfm *tfm) static void crypto_rfc3686_exit_tfm(struct crypto_skcipher *tfm)
{ {
struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm); struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm);
crypto_free_ablkcipher(ctx->child); crypto_free_skcipher(ctx->child);
} }
static struct crypto_instance *crypto_rfc3686_alloc(struct rtattr **tb) static void crypto_rfc3686_free(struct skcipher_instance *inst)
{
struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst);
crypto_drop_skcipher(spawn);
kfree(inst);
}
static int crypto_rfc3686_create(struct crypto_template *tmpl,
struct rtattr **tb)
{ {
struct crypto_attr_type *algt; struct crypto_attr_type *algt;
struct crypto_instance *inst; struct skcipher_instance *inst;
struct crypto_alg *alg; struct skcipher_alg *alg;
struct crypto_skcipher_spawn *spawn; struct crypto_skcipher_spawn *spawn;
const char *cipher_name; const char *cipher_name;
int err; int err;
algt = crypto_get_attr_type(tb); algt = crypto_get_attr_type(tb);
if (IS_ERR(algt)) if (IS_ERR(algt))
return ERR_CAST(algt); return PTR_ERR(algt);
if ((algt->type ^ CRYPTO_ALG_TYPE_BLKCIPHER) & algt->mask) if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
return ERR_PTR(-EINVAL); return -EINVAL;
cipher_name = crypto_attr_alg_name(tb[1]); cipher_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(cipher_name)) if (IS_ERR(cipher_name))
return ERR_CAST(cipher_name); return PTR_ERR(cipher_name);
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst) if (!inst)
return ERR_PTR(-ENOMEM); return -ENOMEM;
spawn = crypto_instance_ctx(inst); spawn = skcipher_instance_ctx(inst);
crypto_set_skcipher_spawn(spawn, inst); crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst));
err = crypto_grab_skcipher(spawn, cipher_name, 0, err = crypto_grab_skcipher2(spawn, cipher_name, 0,
crypto_requires_sync(algt->type, crypto_requires_sync(algt->type,
algt->mask)); algt->mask));
if (err) if (err)
goto err_free_inst; goto err_free_inst;
alg = crypto_skcipher_spawn_alg(spawn); alg = crypto_spawn_skcipher_alg(spawn);
/* We only support 16-byte blocks. */ /* We only support 16-byte blocks. */
err = -EINVAL; err = -EINVAL;
if (alg->cra_ablkcipher.ivsize != CTR_RFC3686_BLOCK_SIZE) if (crypto_skcipher_alg_ivsize(alg) != CTR_RFC3686_BLOCK_SIZE)
goto err_drop_spawn; goto err_drop_spawn;
/* Not a stream cipher? */ /* Not a stream cipher? */
if (alg->cra_blocksize != 1) if (alg->base.cra_blocksize != 1)
goto err_drop_spawn; goto err_drop_spawn;
err = -ENAMETOOLONG; err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "rfc3686(%s)", if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
alg->cra_name) >= CRYPTO_MAX_ALG_NAME) "rfc3686(%s)", alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
goto err_drop_spawn; goto err_drop_spawn;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"rfc3686(%s)", alg->cra_driver_name) >= "rfc3686(%s)", alg->base.cra_driver_name) >=
CRYPTO_MAX_ALG_NAME) CRYPTO_MAX_ALG_NAME)
goto err_drop_spawn; goto err_drop_spawn;
inst->alg.cra_priority = alg->cra_priority; inst->alg.base.cra_priority = alg->base.cra_priority;
inst->alg.cra_blocksize = 1; inst->alg.base.cra_blocksize = 1;
inst->alg.cra_alignmask = alg->cra_alignmask; inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
(alg->cra_flags & CRYPTO_ALG_ASYNC);
inst->alg.cra_type = &crypto_ablkcipher_type;
inst->alg.cra_ablkcipher.ivsize = CTR_RFC3686_IV_SIZE; inst->alg.ivsize = CTR_RFC3686_IV_SIZE;
inst->alg.cra_ablkcipher.min_keysize = inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg);
alg->cra_ablkcipher.min_keysize + CTR_RFC3686_NONCE_SIZE; inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg) +
inst->alg.cra_ablkcipher.max_keysize = CTR_RFC3686_NONCE_SIZE;
alg->cra_ablkcipher.max_keysize + CTR_RFC3686_NONCE_SIZE; inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg) +
CTR_RFC3686_NONCE_SIZE;
inst->alg.cra_ablkcipher.geniv = "seqiv"; inst->alg.setkey = crypto_rfc3686_setkey;
inst->alg.encrypt = crypto_rfc3686_crypt;
inst->alg.decrypt = crypto_rfc3686_crypt;
inst->alg.cra_ablkcipher.setkey = crypto_rfc3686_setkey; inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx);
inst->alg.cra_ablkcipher.encrypt = crypto_rfc3686_crypt;
inst->alg.cra_ablkcipher.decrypt = crypto_rfc3686_crypt;
inst->alg.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx); inst->alg.init = crypto_rfc3686_init_tfm;
inst->alg.exit = crypto_rfc3686_exit_tfm;
inst->alg.cra_init = crypto_rfc3686_init_tfm; inst->free = crypto_rfc3686_free;
inst->alg.cra_exit = crypto_rfc3686_exit_tfm;
return inst; err = skcipher_register_instance(tmpl, inst);
if (err)
goto err_drop_spawn;
out:
return err;
err_drop_spawn: err_drop_spawn:
crypto_drop_skcipher(spawn); crypto_drop_skcipher(spawn);
err_free_inst: err_free_inst:
kfree(inst); kfree(inst);
return ERR_PTR(err); goto out;
}
static void crypto_rfc3686_free(struct crypto_instance *inst)
{
struct crypto_skcipher_spawn *spawn = crypto_instance_ctx(inst);
crypto_drop_skcipher(spawn);
kfree(inst);
} }
static struct crypto_template crypto_rfc3686_tmpl = { static struct crypto_template crypto_rfc3686_tmpl = {
.name = "rfc3686", .name = "rfc3686",
.alloc = crypto_rfc3686_alloc, .create = crypto_rfc3686_create,
.free = crypto_rfc3686_free,
.module = THIS_MODULE, .module = THIS_MODULE,
}; };