* [PATCH] crypto: aead - Do not allow authsize=0 if auth. alg has digestsize>0
@ 2019-08-09 15:51 Pascal van Leeuwen
2019-08-15 12:07 ` Herbert Xu
0 siblings, 1 reply; 2+ messages in thread
From: Pascal van Leeuwen @ 2019-08-09 15:51 UTC (permalink / raw)
To: linux-crypto; +Cc: herbert, davem, Pascal van Leeuwen
Return -EINVAL on an attempt to set the authsize to 0 with an auth.
algorithm with a non-zero digestsize (i.e. anything but digest_null)
as authenticating the data and then throwing away the result does not
make any sense at all.
The digestsize zero exception is for use with digest_null for testing
purposes only.
Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
---
crypto/aead.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/crypto/aead.c b/crypto/aead.c
index 4908b5e..e423107 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -75,7 +75,8 @@ int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
{
int err;
- if (authsize > crypto_aead_maxauthsize(tfm))
+ if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
+ authsize > crypto_aead_maxauthsize(tfm))
return -EINVAL;
if (crypto_aead_alg(tfm)->setauthsize) {
--
1.8.3.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] crypto: aead - Do not allow authsize=0 if auth. alg has digestsize>0
2019-08-09 15:51 [PATCH] crypto: aead - Do not allow authsize=0 if auth. alg has digestsize>0 Pascal van Leeuwen
@ 2019-08-15 12:07 ` Herbert Xu
0 siblings, 0 replies; 2+ messages in thread
From: Herbert Xu @ 2019-08-15 12:07 UTC (permalink / raw)
To: Pascal van Leeuwen; +Cc: linux-crypto, davem, Pascal van Leeuwen
On Fri, Aug 09, 2019 at 05:51:07PM +0200, Pascal van Leeuwen wrote:
> Return -EINVAL on an attempt to set the authsize to 0 with an auth.
> algorithm with a non-zero digestsize (i.e. anything but digest_null)
> as authenticating the data and then throwing away the result does not
> make any sense at all.
>
> The digestsize zero exception is for use with digest_null for testing
> purposes only.
>
> Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
> ---
> crypto/aead.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
Patch applied. Thanks.
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2019-08-15 12:07 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-08-09 15:51 [PATCH] crypto: aead - Do not allow authsize=0 if auth. alg has digestsize>0 Pascal van Leeuwen
2019-08-15 12:07 ` Herbert Xu
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).