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authorHerbert Xu <herbert@gondor.apana.org.au>2016-01-21 17:10:56 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2016-01-25 22:42:11 +0800
commit973fb3fb50e3959d90179d09ed3ce454dd7bc6e4 (patch)
tree9233f42856ad51fb3c92703aa7d2541b8fd3a864
parent7768fb2ee9e907bfa91d13cb698fa68880ddc80a (diff)
downloadlinux-973fb3fb50e3959d90179d09ed3ce454dd7bc6e4.tar.bz2
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>
-rw-r--r--crypto/skcipher.c4
-rw-r--r--include/crypto/skcipher.h11
2 files changed, 10 insertions, 5 deletions
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;
}
/**