feature: SHA-1 Hashing

- Add SHA-1 hashing implementation with Init/Update/Final API and inline test in kernel,
  following the same interface as MD5 & the fpc rtl.

src/kernel.pas

@@ -69,7 +69,8 @@ uses
      video, vesa, doublebuffer, color, lvgl, desktop, uidebug, windows,
      vterminal,
      graphicsrefresh, usbhotplug,
-     fifo, cfifo, cfifols, lifo, circ, minh, maxh, prio;
+     fifo, cfifo, cfifols, lifo, circ, minh, maxh, prio,
+     sha1;
  
 procedure kmain(mbinfo: Pmultiboot_info_t; mbmagic: uint32); stdcall;
  
@@ -104,6 +105,9 @@ var
    dds             : uint32;
    keyboard_layout : array [0..1] of TKeyInfo;
    i : uint32;
+   sha1ctx         : TSHA1Context;
+   sha1dig         : TSHA1Digest;
+   sha1msg         : array[0..9] of uint8;
    
 begin
      { Init the base system unit }
@@ -264,6 +268,25 @@ begin
      maxh.UnitTest;
      prio.UnitTest;
 
+     { SHA1 test: hash 'Helloworld' }
+     sha1msg[0] := $48; { H }
+     sha1msg[1] := $65; { e }
+     sha1msg[2] := $6C; { l }
+     sha1msg[3] := $6C; { l }
+     sha1msg[4] := $6F; { o }
+     sha1msg[5] := $77; { w }
+     sha1msg[6] := $6F; { o }
+     sha1msg[7] := $72; { r }
+     sha1msg[8] := $6C; { l }
+     sha1msg[9] := $64; { d }
+     SHA1Init(@sha1ctx);
+     SHA1Update(@sha1ctx, @sha1msg[0], 10);
+     SHA1Final(@sha1ctx, @sha1dig);
+     syslog.log('SHA1', 'Helloworld = ');
+     for i := 0 to 19 do
+         syslog.writehexpair(sha1dig[i]);
+     syslog.writestringln('');
+
      { Register timer-driven tasks }
      graphicsrefresh.init;
      usbhotplug.init;