crypto: skcipher - Add crypto_skcipher_has_setkey
This patch adds a way for skcipher users to determine whether a key
is required by a transform.
Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 7591928..d199c0b 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -118,6 +118,7 @@
skcipher->decrypt = skcipher_decrypt_blkcipher;
skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher);
+ skcipher->has_setkey = calg->cra_blkcipher.max_keysize;
return 0;
}
@@ -210,6 +211,7 @@
skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) +
sizeof(struct ablkcipher_request);
+ skcipher->has_setkey = calg->cra_ablkcipher.max_keysize;
return 0;
}
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
index d8dd41f..fd8742a 100644
--- a/include/crypto/skcipher.h
+++ b/include/crypto/skcipher.h
@@ -61,6 +61,8 @@
unsigned int ivsize;
unsigned int reqsize;
+ bool has_setkey;
+
struct crypto_tfm base;
};
@@ -305,6 +307,11 @@
return tfm->setkey(tfm, key, keylen);
}
+static inline bool crypto_skcipher_has_setkey(struct crypto_skcipher *tfm)
+{
+ return tfm->has_setkey;
+}
+
/**
* crypto_skcipher_reqtfm() - obtain cipher handle from request
* @req: skcipher_request out of which the cipher handle is to be obtained
