Re: [PATCH 1/2] blkcipher: Copy iv from desc even for 0-len walks

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sun, Dec 06, 2015 at 02:51:37AM +0100, Jason A. Donenfeld wrote:
> Some ciphers actually support encrypting zero length plaintexts. For
> example, many AEAD modes support this. The resulting ciphertext for
> those winds up being only the authentication tag, which is a result of
> the key, the iv, the additional data, and the fact that the plaintext
> had zero length. The blkcipher constructors won't copy the IV to the
> right place, however, when using a zero length input, resulting in
> some significant problems when ciphers call their initialization
> routines, only to find that the ->iv parameter is uninitialized. One
> such example of this would be using chacha20poly1305 with a zero length
> input, which then calls chacha20, which calls the key setup routine,
> which eventually OOPSes due to the uninitialized ->iv member.
> 
> Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx>

Applied to crypto.
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
To unsubscribe from this list: send the line "unsubscribe linux-crypto" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel]     [Gnu Classpath]     [Gnu Crypto]     [DM Crypt]     [Netfilter]     [Bugtraq]

  Powered by Linux