Skip to content

Commit

Permalink
---
Browse files Browse the repository at this point in the history 
yaml
---
r: 351599
b: refs/heads/master
c: 69d3150
h: refs/heads/master
i:
  351597: 204797f
  351595: 9264dd8
  351591: a3c61c0
  351583: 1effa1a
v: v3
  • Loading branch information
Jussi Kivilinna authored and Steffen Klassert committed Jan 8, 2013
1 parent 896f307 commit 02f0017
Show file tree
Hide file tree
Showing 4 changed files with 116 additions and 64 deletions.
2 changes: 1 addition & 1 deletion [refs]
View file
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 71331da500cc13dc3c7e5db397d553c80b2e9994
refs/heads/master: 69d3150cfc2075d1693d17dc711de61bf4e4a6c4
173 changes: 110 additions & 63 deletions trunk/crypto/ctr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@

#include <crypto/algapi.h>
#include <crypto/ctr.h>
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
Expand All @@ -25,10 +26,15 @@ struct crypto_ctr_ctx {
};

struct crypto_rfc3686_ctx {
struct crypto_blkcipher *child;
struct crypto_ablkcipher *child;
u8 nonce[CTR_RFC3686_NONCE_SIZE];
};

struct crypto_rfc3686_req_ctx {
u8 iv[CTR_RFC3686_BLOCK_SIZE];
struct ablkcipher_request subreq CRYPTO_MINALIGN_ATTR;
};

static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
unsigned int keylen)
{
Expand Down Expand Up @@ -243,11 +249,11 @@ static struct crypto_template crypto_ctr_tmpl = {
.module = THIS_MODULE,
};

static int crypto_rfc3686_setkey(struct crypto_tfm *parent, const u8 *key,
unsigned int keylen)
static int crypto_rfc3686_setkey(struct crypto_ablkcipher *parent,
const u8 *key, unsigned int keylen)
{
struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(parent);
struct crypto_blkcipher *child = ctx->child;
struct crypto_rfc3686_ctx *ctx = crypto_ablkcipher_ctx(parent);
struct crypto_ablkcipher *child = ctx->child;
int err;

/* the nonce is stored in bytes at end of key */
Expand All @@ -259,134 +265,175 @@ static int crypto_rfc3686_setkey(struct crypto_tfm *parent, const u8 *key,

keylen -= CTR_RFC3686_NONCE_SIZE;

crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
CRYPTO_TFM_REQ_MASK);
err = crypto_blkcipher_setkey(child, key, keylen);
crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
CRYPTO_TFM_RES_MASK);
crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
CRYPTO_TFM_REQ_MASK);
err = crypto_ablkcipher_setkey(child, key, keylen);
crypto_ablkcipher_set_flags(parent, crypto_ablkcipher_get_flags(child) &
CRYPTO_TFM_RES_MASK);

return err;
}

static int crypto_rfc3686_crypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
static int crypto_rfc3686_crypt(struct ablkcipher_request *req)
{
struct crypto_blkcipher *tfm = desc->tfm;
struct crypto_rfc3686_ctx *ctx = crypto_blkcipher_ctx(tfm);
struct crypto_blkcipher *child = ctx->child;
unsigned long alignmask = crypto_blkcipher_alignmask(tfm);
u8 ivblk[CTR_RFC3686_BLOCK_SIZE + alignmask];
u8 *iv = PTR_ALIGN(ivblk + 0, alignmask + 1);
u8 *info = desc->info;
int err;
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct crypto_rfc3686_ctx *ctx = crypto_ablkcipher_ctx(tfm);
struct crypto_ablkcipher *child = ctx->child;
unsigned long align = crypto_ablkcipher_alignmask(tfm);
struct crypto_rfc3686_req_ctx *rctx =
(void *)PTR_ALIGN((u8 *)ablkcipher_request_ctx(req), align + 1);
struct ablkcipher_request *subreq = &rctx->subreq;
u8 *iv = rctx->iv;

/* set up counter block */
memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
memcpy(iv + CTR_RFC3686_NONCE_SIZE, info, CTR_RFC3686_IV_SIZE);
memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->info, CTR_RFC3686_IV_SIZE);

/* initialize counter portion of counter block */
*(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
cpu_to_be32(1);

desc->tfm = child;
desc->info = iv;
err = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
desc->tfm = tfm;
desc->info = info;
ablkcipher_request_set_tfm(subreq, child);
ablkcipher_request_set_callback(subreq, req->base.flags,
req->base.complete, req->base.data);
ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->nbytes,
iv);

return err;
return crypto_ablkcipher_encrypt(subreq);
}

static int crypto_rfc3686_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_instance *inst = (void *)tfm->__crt_alg;
struct crypto_spawn *spawn = crypto_instance_ctx(inst);
struct crypto_skcipher_spawn *spawn = crypto_instance_ctx(inst);
struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_blkcipher *cipher;
struct crypto_ablkcipher *cipher;
unsigned long align;

cipher = crypto_spawn_blkcipher(spawn);
cipher = crypto_spawn_skcipher(spawn);
if (IS_ERR(cipher))
return PTR_ERR(cipher);

ctx->child = cipher;

align = crypto_tfm_alg_alignmask(tfm);
align &= ~(crypto_tfm_ctx_alignment() - 1);
tfm->crt_ablkcipher.reqsize = align +
sizeof(struct crypto_rfc3686_req_ctx) +
crypto_ablkcipher_reqsize(cipher);

return 0;
}

static void crypto_rfc3686_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);

crypto_free_blkcipher(ctx->child);
crypto_free_ablkcipher(ctx->child);
}

static struct crypto_instance *crypto_rfc3686_alloc(struct rtattr **tb)
{
struct crypto_attr_type *algt;
struct crypto_instance *inst;
struct crypto_alg *alg;
struct crypto_skcipher_spawn *spawn;
const char *cipher_name;
int err;

err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
if (err)
algt = crypto_get_attr_type(tb);
err = PTR_ERR(algt);
if (IS_ERR(algt))
return ERR_PTR(err);

alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_BLKCIPHER,
CRYPTO_ALG_TYPE_MASK);
err = PTR_ERR(alg);
if (IS_ERR(alg))
if ((algt->type ^ CRYPTO_ALG_TYPE_BLKCIPHER) & algt->mask)
return ERR_PTR(-EINVAL);

cipher_name = crypto_attr_alg_name(tb[1]);
err = PTR_ERR(cipher_name);
if (IS_ERR(cipher_name))
return ERR_PTR(err);

inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst)
return ERR_PTR(-ENOMEM);

spawn = crypto_instance_ctx(inst);

crypto_set_skcipher_spawn(spawn, inst);
err = crypto_grab_skcipher(spawn, cipher_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
if (err)
goto err_free_inst;

alg = crypto_skcipher_spawn_alg(spawn);

/* We only support 16-byte blocks. */
err = -EINVAL;
if (alg->cra_blkcipher.ivsize != CTR_RFC3686_BLOCK_SIZE)
goto out_put_alg;
if (alg->cra_ablkcipher.ivsize != CTR_RFC3686_BLOCK_SIZE)
goto err_drop_spawn;

/* Not a stream cipher? */
if (alg->cra_blocksize != 1)
goto out_put_alg;
goto err_drop_spawn;

inst = crypto_alloc_instance("rfc3686", alg);
if (IS_ERR(inst))
goto out;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "rfc3686(%s)",
alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
goto err_drop_spawn;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"rfc3686(%s)", alg->cra_driver_name) >=
CRYPTO_MAX_ALG_NAME)
goto err_drop_spawn;

inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
inst->alg.cra_priority = alg->cra_priority;
inst->alg.cra_blocksize = 1;
inst->alg.cra_alignmask = alg->cra_alignmask;
inst->alg.cra_type = &crypto_blkcipher_type;

inst->alg.cra_blkcipher.ivsize = CTR_RFC3686_IV_SIZE;
inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize
+ CTR_RFC3686_NONCE_SIZE;
inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize
+ CTR_RFC3686_NONCE_SIZE;
inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
(alg->cra_flags & CRYPTO_ALG_ASYNC);
inst->alg.cra_type = &crypto_ablkcipher_type;

inst->alg.cra_ablkcipher.ivsize = CTR_RFC3686_IV_SIZE;
inst->alg.cra_ablkcipher.min_keysize =
alg->cra_ablkcipher.min_keysize + CTR_RFC3686_NONCE_SIZE;
inst->alg.cra_ablkcipher.max_keysize =
alg->cra_ablkcipher.max_keysize + CTR_RFC3686_NONCE_SIZE;

inst->alg.cra_blkcipher.geniv = "seqiv";
inst->alg.cra_ablkcipher.geniv = "seqiv";

inst->alg.cra_ablkcipher.setkey = crypto_rfc3686_setkey;
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.cra_init = crypto_rfc3686_init_tfm;
inst->alg.cra_exit = crypto_rfc3686_exit_tfm;

inst->alg.cra_blkcipher.setkey = crypto_rfc3686_setkey;
inst->alg.cra_blkcipher.encrypt = crypto_rfc3686_crypt;
inst->alg.cra_blkcipher.decrypt = crypto_rfc3686_crypt;

out:
crypto_mod_put(alg);
return inst;

out_put_alg:
inst = ERR_PTR(err);
goto out;
err_drop_spawn:
crypto_drop_skcipher(spawn);
err_free_inst:
kfree(inst);
return ERR_PTR(err);
}

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 = {
.name = "rfc3686",
.alloc = crypto_rfc3686_alloc,
.free = crypto_ctr_free,
.free = crypto_rfc3686_free,
.module = THIS_MODULE,
};

Expand Down
4 changes: 4 additions & 0 deletions trunk/crypto/tcrypt.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1591,6 +1591,10 @@ static int do_test(int m)
speed_template_16_24_32);
test_acipher_speed("ofb(aes)", DECRYPT, sec, NULL, 0,
speed_template_16_24_32);
test_acipher_speed("rfc3686(ctr(aes))", ENCRYPT, sec, NULL, 0,
speed_template_20_28_36);
test_acipher_speed("rfc3686(ctr(aes))", DECRYPT, sec, NULL, 0,
speed_template_20_28_36);
break;

case 501:
Expand Down
1 change: 1 addition & 0 deletions trunk/crypto/tcrypt.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@ static u8 speed_template_8_16[] = {8, 16, 0};
static u8 speed_template_8_32[] = {8, 32, 0};
static u8 speed_template_16_32[] = {16, 32, 0};
static u8 speed_template_16_24_32[] = {16, 24, 32, 0};
static u8 speed_template_20_28_36[] = {20, 28, 36, 0};
static u8 speed_template_32_40_48[] = {32, 40, 48, 0};
static u8 speed_template_32_48[] = {32, 48, 0};
static u8 speed_template_32_48_64[] = {32, 48, 64, 0};
Expand Down

0 comments on commit 02f0017

Please sign in to comment.