crypto: hash - add zero length message hash for shax and md5
Some crypto drivers cannot process empty data message and return a
precalculated hash for md5/sha1/sha224/sha256.
This patch add thoses precalculated hash in include/crypto.
Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/crypto/md5.h b/include/crypto/md5.h
index 146af825..327deac 100644
--- a/include/crypto/md5.h
+++ b/include/crypto/md5.h
@@ -13,6 +13,8 @@
#define MD5_H2 0x98badcfeUL
#define MD5_H3 0x10325476UL
+extern const u8 md5_zero_message_hash[MD5_DIGEST_SIZE];
+
struct md5_state {
u32 hash[MD5_HASH_WORDS];
u32 block[MD5_BLOCK_WORDS];