[checksum] enable x86 acceleration if the CPU supports it

* Newer Intel and AMD CPUs have SSE extensions for SHA-1 and SHA-256 acceleration.
* Add new cpu.c/cpu.h sources to detect the extensions, and use them in checksum.c
  if available.
* Acceleration code is taken from https://github.com/noloader/SHA-Intrinsics.

.vs/rufus.vcxproj

@@ -349,6 +349,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\src\badblocks.c" />
+    <ClCompile Include="..\src\cpu.c" />
     <ClCompile Include="..\src\dos_locale.c" />
     <ClCompile Include="..\src\drive.c" />
     <ClCompile Include="..\src\format.c" />
@@ -380,6 +381,7 @@
     <ClInclude Include="..\res\grub\grub_version.h" />
     <ClInclude Include="..\src\badblocks.h" />
     <ClInclude Include="..\src\bled\bled.h" />
+    <ClInclude Include="..\src\cpu.h" />
     <ClInclude Include="..\src\drive.h" />
     <ClInclude Include="..\src\format.h" />
     <ClInclude Include="..\src\gpt_types.h" />

.vs/rufus.vcxproj.filters

@@ -93,6 +93,9 @@
     <ClCompile Include="..\src\wue.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\cpu.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\src\rufus.h">
@@ -191,6 +194,9 @@
     <ClInclude Include="..\src\vhd.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\src\cpu.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\res\rufus.ico">

src/Makefile.am

@@ -14,8 +14,8 @@ AM_V_WINDRES   = $(AM_V_WINDRES_$(V))
 %_rc.o: %.rc ../res/loc/embedded.loc
 	$(AM_V_WINDRES) $(AM_RCFLAGS) -i $< -o $@
 
-rufus_SOURCES = badblocks.c checksum.c dev.c dos.c dos_locale.c drive.c format.c format_ext.c format_fat32.c icon.c iso.c localization.c \
-	net.c parser.c pki.c process.c re.c rufus.c smart.c stdfn.c stdio.c stdlg.c syslinux.c ui.c vhd.c wue.c
+rufus_SOURCES = badblocks.c checksum.c cpu.c dev.c dos.c dos_locale.c drive.c format.c format_ext.c format_fat32.c icon.c iso.c \
+	localization.c net.c parser.c pki.c process.c re.c rufus.c smart.c stdfn.c stdio.c stdlg.c syslinux.c ui.c vhd.c wue.c
 rufus_CFLAGS = -I$(srcdir)/ms-sys/inc -I$(srcdir)/syslinux/libfat -I$(srcdir)/syslinux/libinstaller -I$(srcdir)/syslinux/win -I$(srcdir)/libcdio $(AM_CFLAGS) \
 	-DEXT2_FLAT_INCLUDES=0 -DSOLUTION=rufus
 rufus_LDFLAGS = $(AM_LDFLAGS) -mwindows -L ../.mingw

src/Makefile.in

@@ -88,7 +88,7 @@ CONFIG_CLEAN_FILES =
 CONFIG_CLEAN_VPATH_FILES =
 PROGRAMS = $(noinst_PROGRAMS)
 am_rufus_OBJECTS = rufus-badblocks.$(OBJEXT) rufus-checksum.$(OBJEXT) \
-	rufus-dev.$(OBJEXT) rufus-dos.$(OBJEXT) \
+	rufus-cpu.$(OBJEXT) rufus-dev.$(OBJEXT) rufus-dos.$(OBJEXT) \
 	rufus-dos_locale.$(OBJEXT) rufus-drive.$(OBJEXT) \
 	rufus-format.$(OBJEXT) rufus-format_ext.$(OBJEXT) \
 	rufus-format_fat32.$(OBJEXT) rufus-icon.$(OBJEXT) \
@@ -281,8 +281,8 @@ AM_V_WINDRES_0 = @echo "  RC     $@";$(WINDRES)
 AM_V_WINDRES_1 = $(WINDRES)
 AM_V_WINDRES_ = $(AM_V_WINDRES_$(AM_DEFAULT_VERBOSITY))
 AM_V_WINDRES = $(AM_V_WINDRES_$(V))
-rufus_SOURCES = badblocks.c checksum.c dev.c dos.c dos_locale.c drive.c format.c format_ext.c format_fat32.c icon.c iso.c localization.c \
-	net.c parser.c pki.c process.c re.c rufus.c smart.c stdfn.c stdio.c stdlg.c syslinux.c ui.c vhd.c wue.c
+rufus_SOURCES = badblocks.c checksum.c cpu.c dev.c dos.c dos_locale.c drive.c format.c format_ext.c format_fat32.c icon.c iso.c \
+	localization.c net.c parser.c pki.c process.c re.c rufus.c smart.c stdfn.c stdio.c stdlg.c syslinux.c ui.c vhd.c wue.c
 
 rufus_CFLAGS = -I$(srcdir)/ms-sys/inc -I$(srcdir)/syslinux/libfat -I$(srcdir)/syslinux/libinstaller -I$(srcdir)/syslinux/win -I$(srcdir)/libcdio $(AM_CFLAGS) \
 	-DEXT2_FLAT_INCLUDES=0 -DSOLUTION=rufus
@@ -357,6 +357,12 @@ rufus-checksum.o: checksum.c
 rufus-checksum.obj: checksum.c
 	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(rufus_CFLAGS) $(CFLAGS) -c -o rufus-checksum.obj `if test -f 'checksum.c'; then $(CYGPATH_W) 'checksum.c'; else $(CYGPATH_W) '$(srcdir)/checksum.c'; fi`
 
+rufus-cpu.o: cpu.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(rufus_CFLAGS) $(CFLAGS) -c -o rufus-cpu.o `test -f 'cpu.c' || echo '$(srcdir)/'`cpu.c
+
+rufus-cpu.obj: cpu.c
+	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(rufus_CFLAGS) $(CFLAGS) -c -o rufus-cpu.obj `if test -f 'cpu.c'; then $(CYGPATH_W) 'cpu.c'; else $(CYGPATH_W) '$(srcdir)/cpu.c'; fi`
+
 rufus-dev.o: dev.c
 	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(rufus_CFLAGS) $(CFLAGS) -c -o rufus-dev.o `test -f 'dev.c' || echo '$(srcdir)/'`dev.c