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crypto: skcipher - Add crypto_skcipher_has_setkey 

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

Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-01-11 21:26:50 +08:00
parent 6de62f15b5
commit a1383cd86a
2 changed files with 9 additions and 0 deletions
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2
crypto/skcipher.c
View File

@ -118,6 +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;
return 0;
}
@ -210,6 +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;
return 0;
}

7
include/crypto/skcipher.h
View File

@ -61,6 +61,8 @@ struct crypto_skcipher {
unsigned int ivsize;
unsigned int reqsize;
bool has_setkey;
struct crypto_tfm base;
};
@ -305,6 +307,11 @@ static inline int crypto_skcipher_setkey(struct crypto_skcipher *tfm,
return tfm->setkey(tfm, key, keylen);
}
static inline bool crypto_skcipher_has_setkey(struct crypto_skcipher *tfm)
{
return tfm->has_setkey;
}
/**
* crypto_skcipher_reqtfm() - obtain cipher handle from request
* @req: skcipher_request out of which the cipher handle is to be obtained