+2019-03-24 Niels Möller <nisse@lysator.liu.se>
+
+ From Simo Sorce:
+ * xts.h: New file.
+ * xts.c: New file.
+ (BE_SHIFT): New macro.
+ (xts_shift, check_length, xts_encrypt_message)
+ (xts_decrypt_message): New functions.
+ * xts-aes128.c (xts_aes128_set_encrypt_key)
+ (xts_aes128_set_decrypt_key, xts_aes128_encrypt_message)
+ (xts_aes128_decrypt_message): New file, new functions.
+ * xts-aes256.c (xts_aes256_set_encrypt_key)
+ (xts_aes256_set_decrypt_key, xts_aes256_encrypt_message)
+ (xts_aes256_decrypt_message): New file, new functions.
+ * nettle.texinfo (XTS): Document XTS mode.
+ * Makefile.in (nettle_SOURCES): Add xts sourcce files.
+ (HEADERS): New installed header xts.h.
+ * testsuite/xts-test.c: New file.
+ * testsuite/Makefile.in (TS_NETTLE_SOURCES): Add xts-test.c.
+
2019-02-06 Niels Möller <nisse@lysator.liu.se>
* gosthash94.h (struct gosthash94_ctx): Move block buffer last in