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authorJason A. Donenfeld <Jason@zx2c4.com>2015-12-06 02:51:38 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2015-12-09 20:16:04 +0800
commit161151d79ff4f7ed35d4ebb0eb7727a517c34ef2 (patch)
tree8987b80f9b613c8a30280f73873dad1239247a83 /crypto/drbg.c
parent3d5b1ecdea6fb94f8c61554fcb2ba776a2d3d0e6 (diff)
downloadlinux-161151d79ff4f7ed35d4ebb0eb7727a517c34ef2.tar.bz2
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>
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