libbb: add optionl support for SHA256/512 encrypted passwords

function                                             old     new   delta
sha_crypt                                              -    2423   +2423
cryptpw_main                                         128     183     +55
to64                                                   -      29     +29
pw_encrypt                                           974    1000     +26
str_rounds                                             -      11     +11
login_main                                          1532    1541      +9
packed_usage                                       25215   25200     -15
__md5_to64                                            29       -     -29
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 3/1 up/down: 2553/-44)         Total: 2509 bytes

1 files changed, 5 insertions, 0 deletions

diff --git a/include/usage.h b/include/usage.h
index 75b44a25b..71f221828 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -557,8 +557,13 @@
      "\n        -r      Delete crontab" \
      "\n        FILE    Replace crontab by FILE ('-': stdin)" \
 
+#if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
+#define cryptpw_trivial_usage \
+       "[-a des|md5|sha256/512] [string]"
+#else
 #define cryptpw_trivial_usage \
        "[-a des|md5] [string]"
+#endif
 #define cryptpw_full_usage "\n\n" \
        "Output crypted string.\n" \
        "If string isn't supplied on cmdline, read it from stdin.\n" \