1 files changed, 68 insertions, 0 deletions
diff --git a/board/aspeed/ast2300/rc4.c b/board/aspeed/ast2300/rc4.c
new file mode 100755
index 0000000000..32e0ffa0ff
--- /dev/null
+++ b/board/aspeed/ast2300/rc4.c
@@ -0,0 +1,68 @@
+/*
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+struct rc4_state
+{
+    int x, y, m[256];
+};
+
+void rc4_setup( struct rc4_state *s, unsigned char *key,  int length )
+{
+    int i, j, k, *m, a;
+
+    s->x = 0;
+    s->y = 0;
+    m = s->m;
+
+    for( i = 0; i < 256; i++ )
+    {
+        m[i] = i;
+    }
+
+    j = k = 0;
+
+    for( i = 0; i < 256; i++ )
+    {
+        a = m[i];
+        j = (unsigned char) ( j + a + key[k] );
+        m[i] = m[j]; m[j] = a;
+        if( ++k >= length ) k = 0;
+    }
+}
+
+void rc4_crypt( struct rc4_state *s, unsigned char *data, int length )
+{ 
+    int i, x, y, *m, a, b;
+
+    x = s->x;
+    y = s->y;
+    m = s->m;
+
+    for( i = 0; i < length; i++ )
+    {
+        x = (unsigned char) ( x + 1 ); a = m[x];
+        y = (unsigned char) ( y + a );
+        m[x] = b = m[y];
+        m[y] = a;
+        data[i] ^= m[(unsigned char) ( a + b )];
+    }
+
+    s->x = x;
+    s->y = y;
+}
+
+void rc4_crypt_sw(unsigned char *data, int ulMsgLength, unsigned char *rc4_key, unsigned long ulKeyLength )
+{
+    struct rc4_state s;
+    
+    rc4_setup( &s, rc4_key, ulKeyLength );
+                                    
+    rc4_crypt( &s, data, ulMsgLength );    
+}