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Subject[PATCH 3.19.y-ckt 004/170] crypto: skcipher - Add crypto_skcipher_has_setkey
Date
3.19.8-ckt18 -stable review patch.  If anyone has any objections, please let me know.

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

From: Herbert Xu <herbert@gondor.apana.org.au>

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@gondor.apana.org.au>
[bwh: Backported to 3.2: add to ablkcipher API instead]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
[kamal: plus bwh http://article.gmane.org/gmane.linux.kernel.stable/169083]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
crypto/ablkcipher.c | 2 ++
crypto/blkcipher.c | 1 +
include/linux/crypto.h | 8 ++++++++
3 files changed, 11 insertions(+)

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index f02fdbe..970b48e 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;
}
@@ -456,6 +457,7 @@ static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
crt->base = __crypto_ablkcipher_cast(tfm);
crt->ivsize = alg->ivsize;
+ crt->has_setkey = alg->max_keysize;

return 0;
}
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 7180cb2..3c551d4 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -471,6 +471,7 @@ static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
}
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
--
2.7.4
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