crypto: vmac - Make VMAC work when blocks aren't aligned

VMAC implementation, as it is, does not work with blocks that
are not multiples of 128-bytes.  Furthermore, this is a problem
when using the implementation on scatterlists, even
when the complete plain text is 128-byte multiple, as the pieces
that get passed to vmac_update can be pretty much any size.

I also added test cases for unaligned blocks.

Signed-off-by: Salman Qazi <sqazi@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/crypto/vmac.h b/include/crypto/vmac.h
index c4467c55df1..6b700c7b2fe 100644
--- a/include/crypto/vmac.h
+++ b/include/crypto/vmac.h
@@ -56,6 +56,8 @@ typedef u64 vmac_t;
 struct vmac_ctx_t {
         struct crypto_cipher *child;
         struct vmac_ctx __vmac_ctx;
+        u8 partial[VMAC_NHBYTES];       /* partial block */
+        int partial_size;               /* size of the partial block */
 };
 
 #endif /* __CRYPTO_VMAC_H */