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[CRYPTO] authenc: Use crypto_grab_skcipher

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This patch converts the authenc algorithm over to crypto_grab_skcipher
which is a prerequisite for IV generation.

This patch also changes authenc to set its ASYNC status depending on
the ASYNC status of the underlying skcipher.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2007-12-17 20:12:49 +08:00
parent b9c55aa475
commit 9ffde35a8e
1 changed files with 38 additions and 27 deletions
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65
crypto/authenc.c
View File

@ -10,7 +10,7 @@
*
*/
#include <crypto/algapi.h>
#include <crypto/internal/skcipher.h>
#include <crypto/authenc.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
@ -23,7 +23,7 @@
struct authenc_instance_ctx {
struct crypto_spawn auth;
struct crypto_spawn enc;
struct crypto_skcipher_spawn enc;
};
struct crypto_authenc_ctx {
@ -237,7 +237,7 @@ static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
if (IS_ERR(auth))
return PTR_ERR(auth);
enc = crypto_spawn_ablkcipher(&ictx->enc);
enc = crypto_spawn_skcipher(&ictx->enc);
err = PTR_ERR(enc);
if (IS_ERR(enc))
goto err_free_hash;
@ -270,42 +270,36 @@ static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
{
struct crypto_attr_type *algt;
struct crypto_instance *inst;
struct crypto_alg *auth;
struct crypto_alg *enc;
struct authenc_instance_ctx *ctx;
const char *enc_name;
int err;
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD);
if (err)
algt = crypto_get_attr_type(tb);
err = PTR_ERR(algt);
if (IS_ERR(algt))
return ERR_PTR(err);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return ERR_PTR(-EINVAL);
auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_HASH_MASK);
if (IS_ERR(auth))
return ERR_PTR(PTR_ERR(auth));
enc = crypto_attr_alg(tb[2], CRYPTO_ALG_TYPE_BLKCIPHER,
CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
inst = ERR_PTR(PTR_ERR(enc));
if (IS_ERR(enc))
enc_name = crypto_attr_alg_name(tb[2]);
err = PTR_ERR(enc_name);
if (IS_ERR(enc_name))
goto out_put_auth;
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
err = -ENOMEM;
if (!inst)
goto out_put_enc;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
"authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"authenc(%s,%s)", auth->cra_driver_name,
enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
goto out_put_auth;
ctx = crypto_instance_ctx(inst);
@ -313,11 +307,28 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
if (err)
goto err_free_inst;
err = crypto_init_spawn(&ctx->enc, enc, inst, CRYPTO_ALG_TYPE_MASK);
crypto_set_skcipher_spawn(&ctx->enc, inst);
err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
if (err)
goto err_drop_auth;
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
enc = crypto_skcipher_spawn_alg(&ctx->enc);
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
"authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
CRYPTO_MAX_ALG_NAME)
goto err_drop_enc;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"authenc(%s,%s)", auth->cra_driver_name,
enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
goto err_drop_enc;
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
inst->alg.cra_blocksize = enc->cra_blocksize;
inst->alg.cra_alignmask = auth->cra_alignmask | enc->cra_alignmask;
@ -338,16 +349,16 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
out:
crypto_mod_put(enc);
out_put_auth:
crypto_mod_put(auth);
return inst;
err_drop_enc:
crypto_drop_skcipher(&ctx->enc);
err_drop_auth:
crypto_drop_spawn(&ctx->auth);
err_free_inst:
kfree(inst);
out_put_enc:
out_put_auth:
inst = ERR_PTR(err);
goto out;
}
@ -356,7 +367,7 @@ static void crypto_authenc_free(struct crypto_instance *inst)
{
struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
crypto_drop_spawn(&ctx->enc);
crypto_drop_skcipher(&ctx->enc);
crypto_drop_spawn(&ctx->auth);
kfree(inst);
}