diff options
Diffstat (limited to 'include/crypto/skcipher.h')
| -rw-r--r-- | include/crypto/skcipher.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h index 750b14f1ada4..562001cb412b 100644 --- a/include/crypto/skcipher.h +++ b/include/crypto/skcipher.h @@ -115,6 +115,9 @@ struct crypto_skcipher { * IV of exactly that size to perform the encrypt or decrypt operation. * @chunksize: Equal to the block size except for stream ciphers such as * CTR where it is set to the underlying block size. + * @walksize: Equal to the chunk size except in cases where the algorithm is + * considerably more efficient if it can operate on multiple chunks + * in parallel. Should be a multiple of chunksize. * @base: Definition of a generic crypto algorithm. * * All fields except @ivsize are mandatory and must be filled. @@ -131,6 +134,7 @@ struct skcipher_alg { unsigned int max_keysize; unsigned int ivsize; unsigned int chunksize; + unsigned int walksize; struct crypto_alg base; }; @@ -289,6 +293,19 @@ static inline unsigned int crypto_skcipher_alg_chunksize( return alg->chunksize; } +static inline unsigned int crypto_skcipher_alg_walksize( + struct skcipher_alg *alg) +{ + if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) == + CRYPTO_ALG_TYPE_BLKCIPHER) + return alg->base.cra_blocksize; + + if (alg->base.cra_ablkcipher.encrypt) + return alg->base.cra_blocksize; + + return alg->walksize; +} + /** * crypto_skcipher_chunksize() - obtain chunk size * @tfm: cipher handle @@ -307,6 +324,23 @@ static inline unsigned int crypto_skcipher_chunksize( } /** + * crypto_skcipher_walksize() - obtain walk size + * @tfm: cipher handle + * + * In some cases, algorithms can only perform optimally when operating on + * multiple blocks in parallel. This is reflected by the walksize, which + * must be a multiple of the chunksize (or equal if the concern does not + * apply) + * + * Return: walk size in bytes + */ +static inline unsigned int crypto_skcipher_walksize( + struct crypto_skcipher *tfm) +{ + return crypto_skcipher_alg_walksize(crypto_skcipher_alg(tfm)); +} + +/** * crypto_skcipher_blocksize() - obtain block size of cipher * @tfm: cipher handle * |