From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Thu, 21 Jan 2016 09:10:56 +0000 (+0800)
Subject: crypto: skcipher - Add default key size helper
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=973fb3fb50e3959d90179d09ed3ce454dd7bc6e4;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

crypto: skcipher - Add default key size helper

While converting ecryptfs over to skcipher I found that it needs
to pick a default key size if one isn't given.  Rather than having
it poke into the guts of the algorithm to get max_keysize, let's
provide a helper that is meant to give a sane default (just in
case we ever get an algorithm that has no maximum key size).

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index d199c0b1751c..69230e9d4ac9 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -118,7 +118,7 @@ static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm)
 	skcipher->decrypt = skcipher_decrypt_blkcipher;
 
 	skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher);
-	skcipher->has_setkey = calg->cra_blkcipher.max_keysize;
+	skcipher->keysize = calg->cra_blkcipher.max_keysize;
 
 	return 0;
 }
@@ -211,7 +211,7 @@ static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
 	skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
 	skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) +
 			    sizeof(struct ablkcipher_request);
-	skcipher->has_setkey = calg->cra_ablkcipher.max_keysize;
+	skcipher->keysize = calg->cra_ablkcipher.max_keysize;
 
 	return 0;
 }
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
index fd8742a40ff3..2f07b4fce3e0 100644
--- a/include/crypto/skcipher.h
+++ b/include/crypto/skcipher.h
@@ -60,8 +60,7 @@ struct crypto_skcipher {
 
 	unsigned int ivsize;
 	unsigned int reqsize;
-
-	bool has_setkey;
+	unsigned int keysize;
 
 	struct crypto_tfm base;
 };
@@ -309,7 +308,13 @@ static inline int crypto_skcipher_setkey(struct crypto_skcipher *tfm,
 
 static inline bool crypto_skcipher_has_setkey(struct crypto_skcipher *tfm)
 {
-	return tfm->has_setkey;
+	return tfm->keysize;
+}
+
+static inline unsigned int crypto_skcipher_default_keysize(
+	struct crypto_skcipher *tfm)
+{
+	return tfm->keysize;
 }
 
 /**