crypto: morus - Add generic MORUS AEAD implementations

This patch adds the generic implementation of the MORUS family of AEAD
algorithms (MORUS-640 and MORUS-1280). The original authors of MORUS
are Hongjun Wu and Tao Huang.

At the time of writing, MORUS is one of the finalists in CAESAR, an
open competition intended to select a portfolio of alternatives to
the problematic AES-GCM:

https://competitions.cr.yp.to/caesar-submissions.html
https://competitions.cr.yp.to/round3/morusv2.pdf

Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/Kconfig b/crypto/Kconfig
index d8d123e..7c53547 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -334,6 +334,18 @@
 	help
 	 AESNI+SSE2 implementation of the AEGSI-256 dedicated AEAD algorithm.
 
+config CRYPTO_MORUS640
+	tristate "MORUS-640 AEAD algorithm"
+	select CRYPTO_AEAD
+	help
+	  Support for the MORUS-640 dedicated AEAD algorithm.
+
+config CRYPTO_MORUS1280
+	tristate "MORUS-1280 AEAD algorithm"
+	select CRYPTO_AEAD
+	help
+	  Support for the MORUS-1280 dedicated AEAD algorithm.
+
 config CRYPTO_SEQIV
 	tristate "Sequence Number IV Generator"
 	select CRYPTO_AEAD