[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>
diff --git a/crypto/aead.c b/crypto/aead.c
index 84a3501..f23c2b0 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -53,6 +53,24 @@
return aead->setkey(tfm, key, keylen);
}
+int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
+{
+ int err;
+
+ if (authsize > crypto_aead_alg(tfm)->maxauthsize)
+ return -EINVAL;
+
+ if (crypto_aead_alg(tfm)->setauthsize) {
+ err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
+ if (err)
+ return err;
+ }
+
+ crypto_aead_crt(tfm)->authsize = authsize;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
+
static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
u32 mask)
{
@@ -64,14 +82,14 @@
struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
struct aead_tfm *crt = &tfm->crt_aead;
- if (max(alg->authsize, alg->ivsize) > PAGE_SIZE / 8)
+ if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
return -EINVAL;
crt->setkey = setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
crt->ivsize = alg->ivsize;
- crt->authsize = alg->authsize;
+ crt->authsize = alg->maxauthsize;
return 0;
}
@@ -85,7 +103,7 @@
seq_printf(m, "type : aead\n");
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
seq_printf(m, "ivsize : %u\n", aead->ivsize);
- seq_printf(m, "authsize : %u\n", aead->authsize);
+ seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
}
const struct crypto_type crypto_aead_type = {