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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-02 18:49:21 +1100
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:16:29 +1100
commit7ba683a6deba70251756aa5a021cdaa5c875a7a2 (patch)
tree80f63039b56bef0287fdf878163a5fe109821e58 /crypto/authenc.c
parente29bc6ad0e84e3157e0f49130a15b278cb232c72 (diff)
[CRYPTO] aead: Make authsize a run-time parameter
As it is authsize is an algorithm paramter which cannot be changed at run-time. This is inconvenient because hardware that implements such algorithms would have to register each authsize that they support separately. Since authsize is a property common to all AEAD algorithms, we can add a function setauthsize that sets it at run-time, just like setkey. This patch does exactly that and also changes authenc so that authsize is no longer a parameter of its template. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/authenc.c')
-rw-r--r--crypto/authenc.c39
1 files changed, 12 insertions, 27 deletions
diff --git a/crypto/authenc.c b/crypto/authenc.c
index 66fb2aa5c325..5df5fb169cbe 100644
--- a/crypto/authenc.c
+++ b/crypto/authenc.c
@@ -24,7 +24,6 @@ struct authenc_instance_ctx {
struct crypto_spawn auth;
struct crypto_spawn enc;
- unsigned int authsize;
unsigned int enckeylen;
};
@@ -76,8 +75,6 @@ out:
static int crypto_authenc_hash(struct aead_request *req)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
- struct authenc_instance_ctx *ictx =
- crypto_instance_ctx(crypto_aead_alg_instance(authenc));
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct crypto_hash *auth = ctx->auth;
struct hash_desc desc = {
@@ -111,7 +108,8 @@ auth_unlock:
if (err)
return err;
- scatterwalk_map_and_copy(hash, dst, cryptlen, ictx->authsize, 1);
+ scatterwalk_map_and_copy(hash, dst, cryptlen,
+ crypto_aead_authsize(authenc), 1);
return 0;
}
@@ -147,8 +145,6 @@ static int crypto_authenc_encrypt(struct aead_request *req)
static int crypto_authenc_verify(struct aead_request *req)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
- struct authenc_instance_ctx *ictx =
- crypto_instance_ctx(crypto_aead_alg_instance(authenc));
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct crypto_hash *auth = ctx->auth;
struct hash_desc desc = {
@@ -186,7 +182,7 @@ auth_unlock:
if (err)
return err;
- authsize = ictx->authsize;
+ authsize = crypto_aead_authsize(authenc);
scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
return memcmp(ihash, ohash, authsize) ? -EINVAL : 0;
}
@@ -224,18 +220,12 @@ static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_hash *auth;
struct crypto_ablkcipher *enc;
- unsigned int digestsize;
int err;
auth = crypto_spawn_hash(&ictx->auth);
if (IS_ERR(auth))
return PTR_ERR(auth);
- err = -EINVAL;
- digestsize = crypto_hash_digestsize(auth);
- if (ictx->authsize > digestsize)
- goto err_free_hash;
-
enc = crypto_spawn_ablkcipher(&ictx->enc);
err = PTR_ERR(enc);
if (IS_ERR(enc))
@@ -246,7 +236,7 @@ static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
tfm->crt_aead.reqsize = max_t(unsigned int,
(crypto_hash_alignmask(auth) &
~(crypto_tfm_ctx_alignment() - 1)) +
- digestsize * 2,
+ crypto_hash_digestsize(auth) * 2,
sizeof(struct ablkcipher_request) +
crypto_ablkcipher_reqsize(enc));
@@ -273,7 +263,6 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
struct crypto_alg *auth;
struct crypto_alg *enc;
struct authenc_instance_ctx *ctx;
- unsigned int authsize;
unsigned int enckeylen;
int err;
@@ -286,18 +275,13 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
if (IS_ERR(auth))
return ERR_PTR(PTR_ERR(auth));
- err = crypto_attr_u32(tb[2], &authsize);
- inst = ERR_PTR(err);
- if (err)
- goto out_put_auth;
-
- enc = crypto_attr_alg(tb[3], CRYPTO_ALG_TYPE_BLKCIPHER,
+ 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))
goto out_put_auth;
- err = crypto_attr_u32(tb[4], &enckeylen);
+ err = crypto_attr_u32(tb[3], &enckeylen);
if (err)
goto out_put_enc;
@@ -308,18 +292,17 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
- "authenc(%s,%u,%s,%u)", auth->cra_name, authsize,
+ "authenc(%s,%s,%u)", auth->cra_name,
enc->cra_name, enckeylen) >= CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
- "authenc(%s,%u,%s,%u)", auth->cra_driver_name,
- authsize, enc->cra_driver_name, enckeylen) >=
+ "authenc(%s,%s,%u)", auth->cra_driver_name,
+ enc->cra_driver_name, enckeylen) >=
CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
ctx = crypto_instance_ctx(inst);
- ctx->authsize = authsize;
ctx->enckeylen = enckeylen;
err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
@@ -337,7 +320,9 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
inst->alg.cra_type = &crypto_aead_type;
inst->alg.cra_aead.ivsize = enc->cra_blkcipher.ivsize;
- inst->alg.cra_aead.authsize = authsize;
+ inst->alg.cra_aead.maxauthsize = auth->cra_type == &crypto_hash_type ?
+ auth->cra_hash.digestsize :
+ auth->cra_digest.dia_digestsize;
inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);