libbb/sha1: add config-selectable fully unrolled version, closes 14391

function                                             old     new   delta
sha1_process_block64                                 364    4167   +3803
static.rconsts                                        16       -     -16
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/0 up/down: 3803/-16)         Total: 3787 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 18 insertions, 7 deletions

diff --git a/libbb/Config.src b/libbb/Config.src
index 24b31fad9..13188ef03 100644
--- a/libbb/Config.src
+++ b/libbb/Config.src
@@ -42,21 +42,32 @@ config MD5_SMALL
         default 1  # all "fast or small" options default to small
         range 0 3
         help
-        Trade binary size versus speed for the md5sum algorithm.
+        Trade binary size versus speed for the md5 algorithm.
         Approximate values running uClibc and hashing
         linux-2.4.4.tar.bz2 were:
-        value               user times (sec)  text size (386)
-        0 (fastest)         1.1                6144
-        1                   1.4                5392
-        2                   3.0                5088
-        3 (smallest)        5.1                4912
+        value           user times (sec)  text size (386)
+        0 (fastest)     1.1               6144
+        1               1.4               5392
+        2               3.0               5088
+        3 (smallest)    5.1               4912
+
+config SHA1_SMALL
+        int "SHA1: Trade bytes for speed (0:fast, 3:slow)"
+        default 3  # all "fast or small" options default to small
+        range 0 3
+        help
+        Trade binary size versus speed for the sha1 algorithm.
+                        throughput MB/s   size of sha1_process_block64
+        value           486  x86-64       486   x86-64
+        0               339  374          4149  4167
+        1,2,3           200  195           358   380
 
 config SHA3_SMALL
         int "SHA3: Trade bytes for speed (0:fast, 1:slow)"
         default 1  # all "fast or small" options default to small
         range 0 1
         help
-        Trade binary size versus speed for the sha3sum algorithm.
+        Trade binary size versus speed for the sha3 algorithm.
         SHA3_SMALL=0 compared to SHA3_SMALL=1 (approximate):
         64-bit x86: +270 bytes of code, 45% faster
         32-bit x86: +450 bytes of code, 75% faster