From f3f13f97944828b9a94dcddbc2d660df262f20e8 Mon Sep 17 00:00:00 2001 From: Andrei Botila Date: Fri, 28 Feb 2020 12:46:48 +0200 Subject: [PATCH] crypto: caam - update xts sector size for large input length MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit 3f142b6a7b573bde6cff926f246da05652c61eb4 upstream. Since in the software implementation of XTS-AES there is no notion of sector every input length is processed the same way. CAAM implementation has the notion of sector which causes different results between the software implementation and the one in CAAM for input lengths bigger than 512 bytes. Increase sector size to maximum value on 16 bits. Fixes: c6415a6016bf ("crypto: caam - add support for acipher xts(aes)") Cc: # v4.12+ Signed-off-by: Andrei Botila Reviewed-by: Horia Geantă Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- drivers/crypto/caam/caamalg_desc.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/caam/caamalg_desc.c b/drivers/crypto/caam/caamalg_desc.c index 6171a81..d6c5818 100644 --- a/drivers/crypto/caam/caamalg_desc.c +++ b/drivers/crypto/caam/caamalg_desc.c @@ -1524,7 +1524,13 @@ EXPORT_SYMBOL(cnstr_shdsc_skcipher_decap); */ void cnstr_shdsc_xts_skcipher_encap(u32 * const desc, struct alginfo *cdata) { - __be64 sector_size = cpu_to_be64(512); + /* + * Set sector size to a big value, practically disabling + * sector size segmentation in xts implementation. We cannot + * take full advantage of this HW feature with existing + * crypto API / dm-crypt SW architecture. + */ + __be64 sector_size = cpu_to_be64(BIT(15)); u32 *key_jump_cmd; init_sh_desc(desc, HDR_SHARE_SERIAL | HDR_SAVECTX); @@ -1577,7 +1583,13 @@ EXPORT_SYMBOL(cnstr_shdsc_xts_skcipher_encap); */ void cnstr_shdsc_xts_skcipher_decap(u32 * const desc, struct alginfo *cdata) { - __be64 sector_size = cpu_to_be64(512); + /* + * Set sector size to a big value, practically disabling + * sector size segmentation in xts implementation. We cannot + * take full advantage of this HW feature with existing + * crypto API / dm-crypt SW architecture. + */ + __be64 sector_size = cpu_to_be64(BIT(15)); u32 *key_jump_cmd; init_sh_desc(desc, HDR_SHARE_SERIAL | HDR_SAVECTX); -- 2.7.4