Merge branch 'support-cfb' into master-updates

diff --cc ChangeLog
index 91c3fd78c19cf1146abbfa0a89886053c31dd3cb,6b52bfe18cbbde3670820d938235b6a7a3408729..24e266eed125c8878053a5af33330a9cf5f93a91
--- 1/ChangeLog
--- 2/ChangeLog
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+ 2017-10-16  Niels Möller  <nisse@lysator.liu.se>
+ 
+       CFB support, contributed by Dmitry Eremin-Solenikov.
+       * cfb.c (cfb_encrypt, cfb_decrypt): New file, new functions.
+       * cfb.h: New header file.
+       (CFB_CTX, CFB_SET_IV, CFB_ENCRYPT, CFB_DECRYPT): New macros.
+       * Makefile.in (nettle_SOURCES): Add cfb.c.
+       (HEADERS): Add cfb.h.
+       * testsuite/cfb-test.c: New test case.
+       * testsuite/testutils.c (test_cipher_cfb): New function.
+       * nettle.texinfo (CFB): Documentation.
+ 
 +2017-10-16  Niels Möller  <nisse@lysator.liu.se>
 +
 +      * aclocal.m4 (GMP_PROG_CC_FOR_BUILD): Add -g when compiling with
 +      gcc.
 +
  2017-09-24  Niels Möller  <nisse@lysator.liu.se>
  
        * tools/pkcs1-conv.c (base64_decode_in_place): New helper