[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>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index f56ae8721bc9..48aa5959abbb 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -187,11 +187,12 @@ struct ablkcipher_alg {
 struct aead_alg {
         int (*setkey)(struct crypto_aead *tfm, const u8 *key,
                       unsigned int keylen);
+        int (*setauthsize)(struct crypto_aead *tfm, unsigned int authsize);
         int (*encrypt)(struct aead_request *req);
         int (*decrypt)(struct aead_request *req);
 
         unsigned int ivsize;
-        unsigned int authsize;
+        unsigned int maxauthsize;
 };
 
 struct blkcipher_alg {
@@ -754,6 +755,8 @@ static inline int crypto_aead_setkey(struct crypto_aead *tfm, const u8 *key,
         return crypto_aead_crt(tfm)->setkey(tfm, key, keylen);
 }
 
+int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize);
+
 static inline struct crypto_aead *crypto_aead_reqtfm(struct aead_request *req)
 {
         return __crypto_aead_cast(req->base.tfm);