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crypto: aegis - fix handling chunked inputs

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commit 0f533e67d26f228ea5dfdacc8a4bdeb487af5208 upstream.

The generic AEGIS implementations all fail the improved AEAD tests
because they produce the wrong result with some data layouts.  The issue
is that they assume that if the skcipher_walk API gives 'nbytes' not
aligned to the walksize (a.k.a. walk.stride), then it is the end of the
data.  In fact, this can happen before the end.  Fix them.

Fixes: f606a88e58 ("crypto: aegis - Add generic AEGIS AEAD implementations")
Cc: <stable@vger.kernel.org> # v4.18+
Cc: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Biggers 2019-01-31 23:51:36 -08:00 committed by Greg Kroah-Hartman
parent 736807d691
commit 4c152af938
3 changed files with 21 additions and 21 deletions
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14
crypto/aegis128.c
View file

@ -290,19 +290,19 @@ static void crypto_aegis128_process_crypt(struct aegis_state *state,
const struct aegis128_ops *ops)
{
struct skcipher_walk walk;
u8 *src, *dst;
unsigned int chunksize;
ops->skcipher_walk_init(&walk, req, false);
while (walk.nbytes) {
src = walk.src.virt.addr;
dst = walk.dst.virt.addr;
chunksize = walk.nbytes;
unsigned int nbytes = walk.nbytes;
ops->crypt_chunk(state, dst, src, chunksize);
if (nbytes < walk.total)
nbytes = round_down(nbytes, walk.stride);
skcipher_walk_done(&walk, 0);
ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
nbytes);
skcipher_walk_done(&walk, walk.nbytes - nbytes);
}
}

14
crypto/aegis128l.c
View file

@ -353,19 +353,19 @@ static void crypto_aegis128l_process_crypt(struct aegis_state *state,
const struct aegis128l_ops *ops)
{
struct skcipher_walk walk;
u8 *src, *dst;
unsigned int chunksize;
ops->skcipher_walk_init(&walk, req, false);
while (walk.nbytes) {
src = walk.src.virt.addr;
dst = walk.dst.virt.addr;
chunksize = walk.nbytes;
unsigned int nbytes = walk.nbytes;
ops->crypt_chunk(state, dst, src, chunksize);
if (nbytes < walk.total)
nbytes = round_down(nbytes, walk.stride);
skcipher_walk_done(&walk, 0);
ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
nbytes);
skcipher_walk_done(&walk, walk.nbytes - nbytes);
}
}

14
crypto/aegis256.c
View file

@ -303,19 +303,19 @@ static void crypto_aegis256_process_crypt(struct aegis_state *state,
const struct aegis256_ops *ops)
{
struct skcipher_walk walk;
u8 *src, *dst;
unsigned int chunksize;
ops->skcipher_walk_init(&walk, req, false);
while (walk.nbytes) {
src = walk.src.virt.addr;
dst = walk.dst.virt.addr;
chunksize = walk.nbytes;
unsigned int nbytes = walk.nbytes;
ops->crypt_chunk(state, dst, src, chunksize);
if (nbytes < walk.total)
nbytes = round_down(nbytes, walk.stride);
skcipher_walk_done(&walk, 0);
ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
nbytes);
skcipher_walk_done(&walk, walk.nbytes - nbytes);
}
}