tree 8987b80f9b613c8a30280f73873dad1239247a83
parent 3d5b1ecdea6fb94f8c61554fcb2ba776a2d3d0e6
author Jason A. Donenfeld <Jason@zx2c4.com> 1449366698 +0100
committer Herbert Xu <herbert@gondor.apana.org.au> 1449663364 +0800

crypto: chacha20poly1305 - Skip encryption/decryption for 0-len

If the length of the plaintext is zero, there's no need to waste cycles
on encryption and decryption. Using the chacha20poly1305 construction
for zero-length plaintexts is a common way of using a shared encryption
key for AAD authentication.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>