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crypto: skcipher - Add default key size helper

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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>
This commit is contained in:
Herbert Xu 2016-01-21 17:10:56 +08:00
parent 7768fb2ee9
commit 973fb3fb50
2 changed files with 10 additions and 5 deletions
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4
crypto/skcipher.c
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@ -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;
}

11
include/crypto/skcipher.h
View File

@ -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;
}
/**