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authorDaniel P. Berrange <berrange@redhat.com>2016-08-24 16:28:15 +0100
committerDaniel P. Berrange <berrange@redhat.com>2016-09-12 12:00:06 +0100
commita5d2f44d0d3e7523670e103a8c37faed29ff2b76 (patch)
tree605c0414b74ebd8bdea7a31fde1da0205a056be0 /audio
parentc2a57aae9a1c3dd7de77daf5478df10379aeeebf (diff)
crypto: ensure XTS is only used with ciphers with 16 byte blocks
The XTS cipher mode needs to be used with a cipher which has a block size of 16 bytes. If a mis-matching block size is used, the code will either corrupt memory beyond the IV array, or not fully encrypt/decrypt the IV. This fixes a memory corruption crash when attempting to use cast5-128 with xts, since the former has an 8 byte block size. A test case is added to ensure the cipher creation fails with such an invalid combination. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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