[CRYPTO] gcm: Use crypto_grab_skcipher
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>
diff --git a/crypto/gcm.c b/crypto/gcm.c
index e87e5de..d539f5e 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -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 @@
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 @@
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 @@
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 @@
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 @@
{
struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
- crypto_drop_spawn(&ctx->ctr);
+ crypto_drop_skcipher(&ctx->ctr);
kfree(inst);
}