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| author | Tero Kristo <t-kristo@ti.com> | 2016-08-04 13:28:40 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2016-09-13 20:20:56 +0800 |
| commit | cb8d5c8346640f3622bc832fede4b514096f762e (patch) | |
| tree | 7f62a6dc9daf45eb4c6b1117176765b067c44c5c /drivers/crypto/omap-sham.c | |
| parent | 5a793bcadbe97df7823598b429c0af052e50df1c (diff) | |
| download | linux-cb8d5c8346640f3622bc832fede4b514096f762e.tar.bz2 | |
crypto: omap-sham - fix SW fallback HMAC handling for omap2/omap3
If software fallback is used on older hardware accelerator setup (OMAP2/
OMAP3), the first block of data must be purged from the buffer. The
first block contains the pre-generated ipad value required by the HW,
but the software fallback algorithm generates its own, causing wrong
results.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/omap-sham.c')
| -rw-r--r-- | drivers/crypto/omap-sham.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c index f788319f7ba7..cf9f617cfcd7 100644 --- a/drivers/crypto/omap-sham.c +++ b/drivers/crypto/omap-sham.c @@ -1143,9 +1143,20 @@ static int omap_sham_final_shash(struct ahash_request *req) { struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm); struct omap_sham_reqctx *ctx = ahash_request_ctx(req); + int offset = 0; + + /* + * If we are running HMAC on limited hardware support, skip + * the ipad in the beginning of the buffer if we are going for + * software fallback algorithm. + */ + if (test_bit(FLAGS_HMAC, &ctx->flags) && + !test_bit(FLAGS_AUTO_XOR, &ctx->dd->flags)) + offset = get_block_size(ctx); return omap_sham_shash_digest(tctx->fallback, req->base.flags, - ctx->buffer, ctx->bufcnt, req->result); + ctx->buffer + offset, + ctx->bufcnt - offset, req->result); } static int omap_sham_final(struct ahash_request *req) |