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crypto: caam - update xts sector size for large input length

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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: c6415a6016 ("crypto: caam - add support for acipher xts(aes)")
Cc: <stable@vger.kernel.org> # v4.12+
Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Andrei Botila 2020-02-28 12:46:48 +02:00 committed by Herbert Xu
parent 3a5a9e1ef3
commit 3f142b6a7b
1 changed files with 14 additions and 2 deletions
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16
drivers/crypto/caam/caamalg_desc.c
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@ -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);