[3.19.y-ckt stable] Patch "crypto: skcipher - Add crypto_skcipher_has_setkey" has been added to the 3.19.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    crypto: skcipher - Add crypto_skcipher_has_setkey

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt18.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From 7af7e06695d2516244f429cad7eec43d9ebc72b1 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert at gondor.apana.org.au>
Date: Mon, 11 Jan 2016 21:26:50 +0800
Subject: crypto: skcipher - Add crypto_skcipher_has_setkey

commit a1383cd86a062fc798899ab20f0ec2116cce39cb upstream.

This patch adds a way for skcipher users to determine whether a key
is required by a transform.

Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
[bwh: Backported to 3.2: add to ablkcipher API instead]
Signed-off-by: Ben Hutchings <ben at decadent.org.uk>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 crypto/ablkcipher.c    | 1 +
 include/linux/crypto.h | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index f02fdbe..5da1652 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -375,6 +375,7 @@ static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
 	}
 	crt->base = __crypto_ablkcipher_cast(tfm);
 	crt->ivsize = alg->ivsize;
+	crt->has_setkey = alg->max_keysize;

 	return 0;
 }
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 9c8776d..4948de9 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -594,6 +594,7 @@ struct ablkcipher_tfm {

 	unsigned int ivsize;
 	unsigned int reqsize;
+	bool has_setkey;
 };

 struct aead_tfm {
@@ -997,6 +998,13 @@ static inline int crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm,
 	return crt->setkey(crt->base, key, keylen);
 }

+static inline bool crypto_ablkcipher_has_setkey(struct crypto_ablkcipher *tfm)
+{
+	struct ablkcipher_tfm *crt = crypto_ablkcipher_crt(tfm);
+
+	return crt->has_setkey;
+}
+
 /**
  * crypto_ablkcipher_reqtfm() - obtain cipher handle from request
  * @req: ablkcipher_request out of which the cipher handle is to be obtained
--
2.7.0