AES bitsliced implementation added

AES bitsliced implementation that is cache attack safe.
Configure with:
  --enable-aes-bitslice
or define:
  WC_AES_BITSLICE
  HAVE_AES_ECB
  HAVE_AES_DIRECT
Very slow for CBC, CFB, OFB and any mode that uses a previous encrypt
block to calculate current.
CTR, GCM, XTS can parallelize the data and be much faster.

Added AES-ECB test to test.c.

configure.ac

@@ -2397,6 +2397,16 @@ then
     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_AES_CFB"
 fi
 
+AC_ARG_ENABLE([aes-bitsliced],
+    [AS_HELP_STRING([--enable-aes-bitsliced],[Enable bitsliced implementation of AES (default: disabled)])],
+    [ ENABLED_AESBS=$enableval ],
+    [ ENABLED_AESBS=no ]
+    )
+
+if test "$ENABLED_AESBS" = "yes"
+then
+    AM_CFLAGS="$AM_CFLAGS -DWC_AES_BITSLICED -DHAVE_AES_ECB -DHAVE_AES_DIRECT"
+fi
 
 # SM4
 ENABLED_SM4="no"
@@ -9394,6 +9404,7 @@ echo "   * AES-CFB:                    $ENABLED_AESCFB"
 echo "   * AES-OFB:                    $ENABLED_AESOFB"
 echo "   * AES-SIV:                    $ENABLED_AESSIV"
 echo "   * AES-EAX:                    $ENABLED_AESEAX"
+echo "   * AES Bitspliced:             $ENABLED_AESBS"
 echo "   * ARIA:                       $ENABLED_ARIA"
 echo "   * DES3:                       $ENABLED_DES3"
 echo "   * Camellia:                   $ENABLED_CAMELLIA"