crypto: hash - Make setkey optional
Since most cryptographic hash algorithms have no keys, this patch
makes the setkey function optional for ahash and shash.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/ahash.c b/crypto/ahash.c
index 9f98956..ba5292d 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -162,6 +162,12 @@
return ahash->setkey(tfm, key, keylen);
}
+static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ return -ENOSYS;
+}
+
int crypto_ahash_import(struct ahash_request *req, const u8 *in)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
@@ -194,7 +200,7 @@
crt->update = alg->update;
crt->final = alg->final;
crt->digest = alg->digest;
- crt->setkey = ahash_setkey;
+ crt->setkey = alg->setkey ? ahash_setkey : ahash_nosetkey;
crt->digestsize = alg->digestsize;
return 0;