crypto: aead - Add crypto_aead_alg_ivsize/maxauthsize
AEAD algorithm implementors need to figure out a given algorithm's
IV size and maximum authentication size. During the transition
this is difficult to do as an algorithm could be new style or old
style.
This patch creates two helpers to make this easier.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/aead.c b/crypto/aead.c
index 5fa992a..c1f73a9 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -69,7 +69,7 @@
{
int err;
- if (authsize > tfm->maxauthsize)
+ if (authsize > crypto_aead_maxauthsize(tfm))
return -EINVAL;
if (tfm->setauthsize) {
@@ -162,8 +162,6 @@
crt->givdecrypt = aead_null_givdecrypt;
}
crt->child = __crypto_aead_cast(tfm);
- crt->ivsize = alg->ivsize;
- crt->maxauthsize = alg->maxauthsize;
crt->authsize = alg->maxauthsize;
return 0;
@@ -182,8 +180,6 @@
aead->encrypt = alg->encrypt;
aead->decrypt = alg->decrypt;
aead->child = __crypto_aead_cast(tfm);
- aead->ivsize = alg->ivsize;
- aead->maxauthsize = alg->maxauthsize;
aead->authsize = alg->maxauthsize;
return 0;
@@ -418,13 +414,8 @@
alg = crypto_spawn_aead_alg(spawn);
- if (alg->base.cra_aead.encrypt) {
- ivsize = alg->base.cra_aead.ivsize;
- maxauthsize = alg->base.cra_aead.maxauthsize;
- } else {
- ivsize = alg->ivsize;
- maxauthsize = alg->maxauthsize;
- }
+ ivsize = crypto_aead_alg_ivsize(alg);
+ maxauthsize = crypto_aead_alg_maxauthsize(alg);
err = -EINVAL;
if (!ivsize)