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[CRYPTO] gcm: Use crypto_grab_skcipher

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

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2007-12-07 19:26:11 +08:00
parent d00aa19b50
commit 1472e5ebaa
1 changed files with 23 additions and 26 deletions
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49
crypto/gcm.c
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@ -8,8 +8,8 @@
* by the Free Software Foundation.
*/
#include <crypto/algapi.h>
#include <crypto/gf128mul.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <linux/completion.h>
#include <linux/err.h>
@ -18,10 +18,8 @@
#include <linux/module.h>
#include <linux/slab.h>
#include "internal.h"
struct gcm_instance_ctx {
struct crypto_spawn ctr;
struct crypto_skcipher_spawn ctr;
};
struct crypto_gcm_ctx {
@ -386,7 +384,7 @@ static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
unsigned long align;
int err;
ctr = crypto_spawn_ablkcipher(&ictx->ctr);
ctr = crypto_spawn_skcipher(&ictx->ctr);
err = PTR_ERR(ctr);
if (IS_ERR(ctr))
return err;
@ -431,15 +429,22 @@ static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return ERR_PTR(-EINVAL);
ctr = crypto_alg_mod_lookup(ctr_name, CRYPTO_ALG_TYPE_BLKCIPHER,
CRYPTO_ALG_TYPE_MASK);
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
if (!inst)
return ERR_PTR(-ENOMEM);
if (IS_ERR(ctr))
return ERR_PTR(PTR_ERR(ctr));
ctx = crypto_instance_ctx(inst);
crypto_set_skcipher_spawn(&ctx->ctr, inst);
err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
if (err)
goto err_free_inst;
ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
/* We only support 16-byte blocks. */
if ((ctr->cra_type == &crypto_blkcipher_type ?
ctr->cra_blkcipher.ivsize : ctr->cra_ablkcipher.ivsize) != 16)
if (ctr->cra_ablkcipher.ivsize != 16)
goto out_put_ctr;
/* Not a stream cipher? */
@ -447,25 +452,16 @@ static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
if (ctr->cra_blocksize != 1)
goto out_put_ctr;
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
err = -ENOMEM;
if (!inst)
goto out_put_ctr;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"gcm_base(%s)", ctr->cra_driver_name) >=
CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
ctx = crypto_instance_ctx(inst);
err = crypto_init_spawn(&ctx->ctr, ctr, inst, CRYPTO_ALG_TYPE_MASK);
if (err)
goto err_free_inst;
goto out_put_ctr;
memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
inst->alg.cra_priority = ctr->cra_priority;
inst->alg.cra_blocksize = 1;
inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
@ -480,11 +476,12 @@ static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
out:
crypto_mod_put(ctr);
return inst;
out_put_ctr:
crypto_drop_skcipher(&ctx->ctr);
err_free_inst:
kfree(inst);
out_put_ctr:
inst = ERR_PTR(err);
goto out;
}
@ -516,7 +513,7 @@ static void crypto_gcm_free(struct crypto_instance *inst)
{
struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
crypto_drop_spawn(&ctx->ctr);
crypto_drop_skcipher(&ctx->ctr);
kfree(inst);
}