From: Herbert Xu herbert@gondor.apana.org.au
commit 5b0fe9552336338acb52756daf65dd7a4eeca73f upstream.
When algif_skcipher does a partial operation it always process data that is a multiple of blocksize. However, for algorithms such as CTR this is wrong because even though it can process any number of bytes overall, the partial block must come at the very end and not in the middle.
This is exactly what chunksize is meant to describe so this patch changes blocksize to chunksize.
Fixes: 8ff590903d5f ("crypto: algif_skcipher - User-space...") Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Acked-by: Ard Biesheuvel ard.biesheuvel@linaro.org Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- crypto/algif_skcipher.c | 2 +- include/crypto/internal/skcipher.h | 30 ------------------------------ include/crypto/skcipher.h | 30 ++++++++++++++++++++++++++++++ 3 files changed, 31 insertions(+), 31 deletions(-)
--- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -56,7 +56,7 @@ static int _skcipher_recvmsg(struct sock struct alg_sock *pask = alg_sk(psk); struct af_alg_ctx *ctx = ask->private; struct crypto_skcipher *tfm = pask->private; - unsigned int bs = crypto_skcipher_blocksize(tfm); + unsigned int bs = crypto_skcipher_chunksize(tfm); struct af_alg_async_req *areq; int err = 0; size_t len = 0; --- a/include/crypto/internal/skcipher.h +++ b/include/crypto/internal/skcipher.h @@ -205,19 +205,6 @@ static inline unsigned int crypto_skciph return alg->max_keysize; }
-static inline unsigned int crypto_skcipher_alg_chunksize( - 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->chunksize; -} - static inline unsigned int crypto_skcipher_alg_walksize( struct skcipher_alg *alg) { @@ -232,23 +219,6 @@ static inline unsigned int crypto_skciph }
/** - * crypto_skcipher_chunksize() - obtain chunk size - * @tfm: cipher handle - * - * The block size is set to one for ciphers such as CTR. However, - * you still need to provide incremental updates in multiples of - * the underlying block size as the IV does not have sub-block - * granularity. This is known in this API as the chunk size. - * - * Return: chunk size in bytes - */ -static inline unsigned int crypto_skcipher_chunksize( - struct crypto_skcipher *tfm) -{ - return crypto_skcipher_alg_chunksize(crypto_skcipher_alg(tfm)); -} - -/** * crypto_skcipher_walksize() - obtain walk size * @tfm: cipher handle * --- a/include/crypto/skcipher.h +++ b/include/crypto/skcipher.h @@ -304,6 +304,36 @@ static inline unsigned int crypto_skciph return crypto_tfm_alg_blocksize(crypto_skcipher_tfm(tfm)); }
+static inline unsigned int crypto_skcipher_alg_chunksize( + 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->chunksize; +} + +/** + * crypto_skcipher_chunksize() - obtain chunk size + * @tfm: cipher handle + * + * The block size is set to one for ciphers such as CTR. However, + * you still need to provide incremental updates in multiples of + * the underlying block size as the IV does not have sub-block + * granularity. This is known in this API as the chunk size. + * + * Return: chunk size in bytes + */ +static inline unsigned int crypto_skcipher_chunksize( + struct crypto_skcipher *tfm) +{ + return crypto_skcipher_alg_chunksize(crypto_skcipher_alg(tfm)); +} + static inline unsigned int crypto_sync_skcipher_blocksize( struct crypto_sync_skcipher *tfm) {