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authorHerbert Xu <herbert@gondor.apana.org.au>2015-07-09 07:17:22 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2015-07-14 14:56:46 +0800
commit5964f26c9f6003e9badedb768a0735eaf034ac56 (patch)
tree306cb5e1d0be7cce24026c80a4ae9cc9030e5be7 /crypto
parent5499b1a7311f5ec301ac2baa04a3482ee89ac0ab (diff)
downloadlinux-5964f26c9f6003e9badedb768a0735eaf034ac56.tar.bz2
crypto: seqiv - Replace seqniv with seqiv
This patch replaces the seqniv generator with seqiv when the underlying algorithm understands the new calling convention. This not only makes more sense as now seqiv is solely responsible for IV generation rather than also determining how the IV is going to be used, it also allows for optimisations in the underlying implementation. For example, the space for the IV could be used to add padding for authentication. This patch also removes the unnecessary copying of IV to dst during seqiv decryption as the IV is part of the AD and not cipher text. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/seqiv.c34
1 files changed, 19 insertions, 15 deletions
diff --git a/crypto/seqiv.c b/crypto/seqiv.c
index 122c56e3491b..45d0563f681a 100644
--- a/crypto/seqiv.c
+++ b/crypto/seqiv.c
@@ -467,9 +467,6 @@ static int seqiv_aead_decrypt(struct aead_request *req)
aead_request_set_ad(subreq, req->assoclen + ivsize);
scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
- if (req->src != req->dst)
- scatterwalk_map_and_copy(req->iv, req->dst,
- req->assoclen, ivsize, 1);
return crypto_aead_decrypt(subreq);
}
@@ -516,9 +513,9 @@ static int seqiv_old_aead_init(struct crypto_tfm *tfm)
return err ?: aead_geniv_init(tfm);
}
-static int seqiv_aead_init_common(struct crypto_tfm *tfm, unsigned int reqsize)
+static int seqiv_aead_init_common(struct crypto_aead *geniv,
+ unsigned int reqsize)
{
- struct crypto_aead *geniv = __crypto_aead_cast(tfm);
struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv);
int err;
@@ -541,7 +538,7 @@ static int seqiv_aead_init_common(struct crypto_tfm *tfm, unsigned int reqsize)
if (IS_ERR(ctx->null))
goto out;
- err = aead_geniv_init(tfm);
+ err = aead_geniv_init(crypto_aead_tfm(geniv));
if (err)
goto drop_null;
@@ -556,19 +553,19 @@ drop_null:
goto out;
}
-static int seqiv_aead_init(struct crypto_tfm *tfm)
+static int seqiv_aead_init(struct crypto_aead *tfm)
{
return seqiv_aead_init_common(tfm, sizeof(struct aead_request));
}
-static int seqniv_aead_init(struct crypto_tfm *tfm)
+static int seqniv_aead_init(struct crypto_aead *tfm)
{
return seqiv_aead_init_common(tfm, sizeof(struct seqniv_request_ctx));
}
-static void seqiv_aead_exit(struct crypto_tfm *tfm)
+static void seqiv_aead_exit(struct crypto_aead *tfm)
{
- struct seqiv_aead_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct seqiv_aead_ctx *ctx = crypto_aead_ctx(tfm);
crypto_free_aead(ctx->geniv.child);
crypto_put_default_null_skcipher();
@@ -666,11 +663,11 @@ static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->alg.encrypt = seqiv_aead_encrypt;
inst->alg.decrypt = seqiv_aead_decrypt;
- inst->alg.base.cra_init = seqiv_aead_init;
- inst->alg.base.cra_exit = seqiv_aead_exit;
+ inst->alg.init = seqiv_aead_init;
+ inst->alg.exit = seqiv_aead_exit;
inst->alg.base.cra_ctxsize = sizeof(struct seqiv_aead_ctx);
- inst->alg.base.cra_ctxsize += inst->alg.base.cra_aead.ivsize;
+ inst->alg.base.cra_ctxsize += inst->alg.ivsize;
done:
err = aead_register_instance(tmpl, inst);
@@ -727,8 +724,15 @@ static int seqniv_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->alg.encrypt = seqniv_aead_encrypt;
inst->alg.decrypt = seqniv_aead_decrypt;
- inst->alg.base.cra_init = seqniv_aead_init;
- inst->alg.base.cra_exit = seqiv_aead_exit;
+ inst->alg.init = seqniv_aead_init;
+ inst->alg.exit = seqiv_aead_exit;
+
+ if ((alg->base.cra_flags & CRYPTO_ALG_AEAD_NEW)) {
+ inst->alg.encrypt = seqiv_aead_encrypt;
+ inst->alg.decrypt = seqiv_aead_decrypt;
+
+ inst->alg.init = seqiv_aead_init;
+ }
inst->alg.base.cra_alignmask |= __alignof__(u32) - 1;
inst->alg.base.cra_ctxsize = sizeof(struct seqiv_aead_ctx);