gst/librfb/: VNC Authentication should be working now temperaly with fake password 'testtest'

Original commit message from CVS:
* gst/librfb/Makefile.am:
* gst/librfb/d3des.c:
* gst/librfb/d3des.h:
* gst/librfb/rfbdecoder.c:
* gst/librfb/vncauth.c:
* gst/librfb/vncauth.h:
VNC Authentication should be working now
temperaly with fake password 'testtest'

6 files changed, 776 insertions, 5 deletions

diff --git a/gst/librfb/Makefile.am b/gst/librfb/Makefile.am
index 74dbfbc7..626dc5b4 100644
--- a/gst/librfb/Makefile.am
+++ b/gst/librfb/Makefile.am
@@ -11,7 +11,9 @@ libgstrfbsrc_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 librfb_la_SOURCES = \
 	rfbbuffer.c \
 	rfbdecoder.c \
-	rfbbytestream.c
+	rfbbytestream.c \
+	d3des.c \
+	vncauth.c
 librfb_la_CFLAGS = $(GST_CFLAGS) -I$(srcdir)/..
 librfb_la_LIBADD = $(GLIB_LIBS)
 
@@ -22,4 +24,6 @@ noinst_HEADERS = \
 	rfbbytestream.h \
 	rfbcontext.h \
 	rfbutil.h \
-	gstrfbsrc.h
+	gstrfbsrc.h \
+	d3des.h \
+	vncauth.h
diff --git a/gst/librfb/d3des.c b/gst/librfb/d3des.c
new file mode 100644
index 00000000..0200573a
--- /dev/null
+++ b/gst/librfb/d3des.c
@@ -0,0 +1,477 @@
+/*
+ * This is D3DES (V5.09) by Richard Outerbridge with the double and
+ * triple-length support removed for use in VNC.  Also the bytebit[] array
+ * has been reversed so that the most significant bit in each byte of the
+ * key is ignored, not the least significant.
+ *
+ * These changes are:
+ *  Copyright (C) 1999 AT&T Laboratories Cambridge.  All Rights Reserved.
+ *
+ * This software 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.
+ */
+
+/* D3DES (V5.09) -
+ *
+ * A portable, public domain, version of the Data Encryption Standard.
+ *
+ * Written with Symantec's THINK (Lightspeed) C by Richard Outerbridge.
+ * Thanks to: Dan Hoey for his excellent Initial and Inverse permutation
+ * code;  Jim Gillogly & Phil Karn for the DES key schedule code; Dennis
+ * Ferguson, Eric Young and Dana How for comparing notes; and Ray Lau,
+ * for humouring me on.
+ *
+ * Copyright (c) 1988,1989,1990,1991,1992 by Richard Outerbridge.
+ * (GEnie : OUTER; CIS : [71755,204]) Graven Imagery, 1992.
+ */
+
+#include "config.h"
+#include "stdint.h"
+
+#include "d3des.h"
+
+static void scrunch (unsigned char *, unsigned long *);
+static void unscrun (unsigned long *, unsigned char *);
+static void desfunc (unsigned long *, unsigned long *);
+static void cookey (unsigned long *);
+
+static unsigned long KnL[32] = { 0L };
+
+//static unsigned long KnR[32] = { 0L };
+//static unsigned long Kn3[32] = { 0L };
+/* 
+ * static unsigned char Df_Key[24] = {
+ * 	0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,
+ * 	0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,
+ * 	0x89,0xab,0xcd,0xef,0x01,0x23,0x45,0x67 };
+ */
+
+static uint16_t bytebit[8] = {
+  01, 02, 04, 010, 020, 040, 0100, 0200
+};
+
+static unsigned long bigbyte[24] = {
+  0x800000L, 0x400000L, 0x200000L, 0x100000L,
+  0x80000L, 0x40000L, 0x20000L, 0x10000L,
+  0x8000L, 0x4000L, 0x2000L, 0x1000L,
+  0x800L, 0x400L, 0x200L, 0x100L,
+  0x80L, 0x40L, 0x20L, 0x10L,
+  0x8L, 0x4L, 0x2L, 0x1L
+};
+
+/* Use the key schedule specified in the Standard (ANSI X3.92-1981). */
+
+static unsigned char pc1[56] = {
+  56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
+  9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
+  62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
+  13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
+};
+
+static unsigned char totrot[16] = {
+  1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28
+};
+
+static unsigned char pc2[48] = {
+  13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
+  22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
+  40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
+  43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
+};
+
+void
+deskey (key, edf)               /* Thanks to James Gillogly & Phil Karn! */
+     unsigned char *key;
+     int32_t edf;
+{
+  register int32_t i, j, l, m, n;
+  unsigned char pc1m[56], pcr[56];
+  unsigned long kn[32];
+
+  for (j = 0; j < 56; j++) {
+    l = pc1[j];
+    m = l & 07;
+    pc1m[j] = (key[l >> 3] & bytebit[m]) ? 1 : 0;
+  }
+  for (i = 0; i < 16; i++) {
+    if (edf == DE1)
+      m = (15 - i) << 1;
+    else
+      m = i << 1;
+    n = m + 1;
+    kn[m] = kn[n] = 0L;
+    for (j = 0; j < 28; j++) {
+      l = j + totrot[i];
+      if (l < 28)
+        pcr[j] = pc1m[l];
+      else
+        pcr[j] = pc1m[l - 28];
+    }
+    for (j = 28; j < 56; j++) {
+      l = j + totrot[i];
+      if (l < 56)
+        pcr[j] = pc1m[l];
+      else
+        pcr[j] = pc1m[l - 28];
+    }
+    for (j = 0; j < 24; j++) {
+      if (pcr[pc2[j]])
+        kn[m] |= bigbyte[j];
+      if (pcr[pc2[j + 24]])
+        kn[n] |= bigbyte[j];
+    }
+  }
+  cookey (kn);
+  return;
+}
+
+static void
+cookey (raw1)
+     register unsigned long *raw1;
+{
+  register unsigned long *cook, *raw0;
+  unsigned long dough[32];
+  register int32_t i;
+
+  cook = dough;
+  for (i = 0; i < 16; i++, raw1++) {
+    raw0 = raw1++;
+    *cook = (*raw0 & 0x00fc0000L) << 6;
+    *cook |= (*raw0 & 0x00000fc0L) << 10;
+    *cook |= (*raw1 & 0x00fc0000L) >> 10;
+    *cook++ |= (*raw1 & 0x00000fc0L) >> 6;
+    *cook = (*raw0 & 0x0003f000L) << 12;
+    *cook |= (*raw0 & 0x0000003fL) << 16;
+    *cook |= (*raw1 & 0x0003f000L) >> 4;
+    *cook++ |= (*raw1 & 0x0000003fL);
+  }
+  usekey (dough);
+  return;
+}
+
+void
+cpkey (into)
+     register unsigned long *into;
+{
+  register unsigned long *from, *endp;
+
+  from = KnL, endp = &KnL[32];
+  while (from < endp)
+    *into++ = *from++;
+  return;
+}
+
+void
+usekey (from)
+     register unsigned long *from;
+{
+  register unsigned long *to, *endp;
+
+  to = KnL, endp = &KnL[32];
+  while (to < endp)
+    *to++ = *from++;
+  return;
+}
+
+void
+des (inblock, outblock)
+     unsigned char *inblock, *outblock;
+{
+  unsigned long work[2];
+
+  scrunch (inblock, work);
+  desfunc (work, KnL);
+  unscrun (work, outblock);
+  return;
+}
+
+static void
+scrunch (outof, into)
+     register unsigned char *outof;
+     register unsigned long *into;
+{
+  *into = (*outof++ & 0xffL) << 24;
+  *into |= (*outof++ & 0xffL) << 16;
+  *into |= (*outof++ & 0xffL) << 8;
+  *into++ |= (*outof++ & 0xffL);
+  *into = (*outof++ & 0xffL) << 24;
+  *into |= (*outof++ & 0xffL) << 16;
+  *into |= (*outof++ & 0xffL) << 8;
+  *into |= (*outof & 0xffL);
+  return;
+}
+
+static void
+unscrun (outof, into)
+     register unsigned long *outof;
+     register unsigned char *into;
+{
+  *into++ = (*outof >> 24) & 0xffL;
+  *into++ = (*outof >> 16) & 0xffL;
+  *into++ = (*outof >> 8) & 0xffL;
+  *into++ = *outof++ & 0xffL;
+  *into++ = (*outof >> 24) & 0xffL;
+  *into++ = (*outof >> 16) & 0xffL;
+  *into++ = (*outof >> 8) & 0xffL;
+  *into = *outof & 0xffL;
+  return;
+}
+
+static unsigned long SP1[64] = {
+  0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L,
+  0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L,
+  0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L,
+  0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L,
+  0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L,
+  0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L,
+  0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L,
+  0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L,
+  0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L,
+  0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L,
+  0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L,
+  0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L,
+  0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L,
+  0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L,
+  0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L,
+  0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L
+};
+
+static unsigned long SP2[64] = {
+  0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L,
+  0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L,
+  0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L,
+  0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L,
+  0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L,
+  0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L,
+  0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L,
+  0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L,
+  0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L,
+  0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L,
+  0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L,
+  0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L,
+  0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L,
+  0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L,
+  0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L,
+  0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L
+};
+
+static unsigned long SP3[64] = {
+  0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L,
+  0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L,
+  0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L,
+  0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L,
+  0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L,
+  0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L,
+  0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L,
+  0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L,
+  0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L,
+  0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L,
+  0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L,
+  0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L,
+  0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L,
+  0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L,
+  0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L,
+  0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L
+};
+
+static unsigned long SP4[64] = {
+  0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
+  0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L,
+  0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L,
+  0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L,
+  0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L,
+  0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L,
+  0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L,
+  0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L,
+  0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L,
+  0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L,
+  0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L,
+  0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
+  0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L,
+  0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L,
+  0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L,
+  0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L
+};
+
+static unsigned long SP5[64] = {
+  0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L,
+  0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L,
+  0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L,
+  0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L,
+  0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L,
+  0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L,
+  0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L,
+  0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L,
+  0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L,
+  0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L,
+  0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L,
+  0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L,
+  0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L,
+  0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L,
+  0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L,
+  0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L
+};
+
+static unsigned long SP6[64] = {
+  0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L,
+  0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L,
+  0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L,
+  0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L,
+  0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L,
+  0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L,
+  0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L,
+  0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L,
+  0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L,
+  0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L,
+  0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L,
+  0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L,
+  0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L,
+  0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L,
+  0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L,
+  0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L
+};
+
+static unsigned long SP7[64] = {
+  0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L,
+  0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L,
+  0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L,
+  0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L,
+  0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L,
+  0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L,
+  0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L,
+  0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L,
+  0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L,
+  0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L,
+  0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L,
+  0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L,
+  0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L,
+  0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L,
+  0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L,
+  0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L
+};
+
+static unsigned long SP8[64] = {
+  0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L,
+  0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L,
+  0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L,
+  0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L,
+  0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L,
+  0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L,
+  0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L,
+  0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L,
+  0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L,
+  0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L,
+  0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L,
+  0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L,
+  0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L,
+  0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L,
+  0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L,
+  0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L
+};
+
+static void
+desfunc (block, keys)
+     register unsigned long *block, *keys;
+{
+  register unsigned long fval, work, right, leftt;
+  register int32_t round;
+
+  leftt = block[0];
+  right = block[1];
+  work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;
+  right ^= work;
+  leftt ^= (work << 4);
+  work = ((leftt >> 16) ^ right) & 0x0000ffffL;
+  right ^= work;
+  leftt ^= (work << 16);
+  work = ((right >> 2) ^ leftt) & 0x33333333L;
+  leftt ^= work;
+  right ^= (work << 2);
+  work = ((right >> 8) ^ leftt) & 0x00ff00ffL;
+  leftt ^= work;
+  right ^= (work << 8);
+  right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL;
+  work = (leftt ^ right) & 0xaaaaaaaaL;
+  leftt ^= work;
+  right ^= work;
+  leftt = ((leftt << 1) | ((leftt >> 31) & 1L)) & 0xffffffffL;
+
+  for (round = 0; round < 8; round++) {
+    work = (right << 28) | (right >> 4);
+    work ^= *keys++;
+    fval = SP7[work & 0x3fL];
+    fval |= SP5[(work >> 8) & 0x3fL];
+    fval |= SP3[(work >> 16) & 0x3fL];
+    fval |= SP1[(work >> 24) & 0x3fL];
+    work = right ^ *keys++;
+    fval |= SP8[work & 0x3fL];
+    fval |= SP6[(work >> 8) & 0x3fL];
+    fval |= SP4[(work >> 16) & 0x3fL];
+    fval |= SP2[(work >> 24) & 0x3fL];
+    leftt ^= fval;
+    work = (leftt << 28) | (leftt >> 4);
+    work ^= *keys++;
+    fval = SP7[work & 0x3fL];
+    fval |= SP5[(work >> 8) & 0x3fL];
+    fval |= SP3[(work >> 16) & 0x3fL];
+    fval |= SP1[(work >> 24) & 0x3fL];
+    work = leftt ^ *keys++;
+    fval |= SP8[work & 0x3fL];
+    fval |= SP6[(work >> 8) & 0x3fL];
+    fval |= SP4[(work >> 16) & 0x3fL];
+    fval |= SP2[(work >> 24) & 0x3fL];
+    right ^= fval;
+  }
+
+  right = (right << 31) | (right >> 1);
+  work = (leftt ^ right) & 0xaaaaaaaaL;
+  leftt ^= work;
+  right ^= work;
+  leftt = (leftt << 31) | (leftt >> 1);
+  work = ((leftt >> 8) ^ right) & 0x00ff00ffL;
+  right ^= work;
+  leftt ^= (work << 8);
+  work = ((leftt >> 2) ^ right) & 0x33333333L;
+  right ^= work;
+  leftt ^= (work << 2);
+  work = ((right >> 16) ^ leftt) & 0x0000ffffL;
+  leftt ^= work;
+  right ^= (work << 16);
+  work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;
+  leftt ^= work;
+  right ^= (work << 4);
+  *block++ = right;
+  *block = leftt;
+  return;
+}
+
+/* Validation sets:
+ *
+ * Single-length key, single-length plaintext -
+ * Key	  : 0123 4567 89ab cdef
+ * Plain  : 0123 4567 89ab cde7
+ * Cipher : c957 4425 6a5e d31d
+ *
+ * Double-length key, single-length plaintext -
+ * Key	  : 0123 4567 89ab cdef fedc ba98 7654 3210
+ * Plain  : 0123 4567 89ab cde7
+ * Cipher : 7f1d 0a77 826b 8aff
+ *
+ * Double-length key, double-length plaintext -
+ * Key	  : 0123 4567 89ab cdef fedc ba98 7654 3210
+ * Plain  : 0123 4567 89ab cdef 0123 4567 89ab cdff
+ * Cipher : 27a0 8440 406a df60 278f 47cf 42d6 15d7
+ *
+ * Triple-length key, single-length plaintext -
+ * Key	  : 0123 4567 89ab cdef fedc ba98 7654 3210 89ab cdef 0123 4567
+ * Plain  : 0123 4567 89ab cde7
+ * Cipher : de0b 7c06 ae5e 0ed5
+ *
+ * Triple-length key, double-length plaintext -
+ * Key	  : 0123 4567 89ab cdef fedc ba98 7654 3210 89ab cdef 0123 4567
+ * Plain  : 0123 4567 89ab cdef 0123 4567 89ab cdff
+ * Cipher : ad0d 1b30 ac17 cf07 0ed1 1c63 81e4 4de5
+ *
+ * d3des V5.0a rwo 9208.07 18:44 Graven Imagery
+ **********************************************************************/
diff --git a/gst/librfb/d3des.h b/gst/librfb/d3des.h
new file mode 100644
index 00000000..e647fc12
--- /dev/null
+++ b/gst/librfb/d3des.h
@@ -0,0 +1,52 @@
+/*
+ * This is D3DES (V5.09) by Richard Outerbridge with the double and
+ * triple-length support removed for use in VNC.
+ *
+ * These changes are:
+ *  Copyright (C) 1999 AT&T Laboratories Cambridge.  All Rights Reserved.
+ *
+ * This software 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.
+ */
+
+/* d3des.h -
+ *
+ *	Headers and defines for d3des.c
+ *	Graven Imagery, 1992.
+ *
+ * Copyright (c) 1988,1989,1990,1991,1992 by Richard Outerbridge
+ *	(GEnie : OUTER; CIS : [71755,204])
+ */
+
+#define EN0	0	/* MODE == encrypt */
+#define DE1	1	/* MODE == decrypt */
+
+extern void deskey(unsigned char *, int);
+/*		      hexkey[8]     MODE
+ * Sets the internal key register according to the hexadecimal
+ * key contained in the 8 bytes of hexkey, according to the DES,
+ * for encryption or decryption according to MODE.
+ */
+
+extern void usekey(unsigned long *);
+/*		    cookedkey[32]
+ * Loads the internal key register with the data in cookedkey.
+ */
+
+extern void cpkey(unsigned long *);
+/*		   cookedkey[32]
+ * Copies the contents of the internal key register into the storage
+ * located at &cookedkey[0].
+ */
+
+extern void des(unsigned char *, unsigned char *);
+/*		    from[8]	      to[8]
+ * Encrypts/Decrypts (according to the key currently loaded in the
+ * internal key register) one block of eight bytes at address 'from'
+ * into the block at address 'to'.  They can be the same.
+ */
+
+/* d3des.h V5.09 rwo 9208.04 15:06 Graven Imagery
+ ********************************************************************/
+
diff --git a/gst/librfb/rfbdecoder.c b/gst/librfb/rfbdecoder.c
index eedfefce..6f6050ff 100644
--- a/gst/librfb/rfbdecoder.c
+++ b/gst/librfb/rfbdecoder.c
@@ -13,6 +13,8 @@
 #include <arpa/inet.h>
 #include <errno.h>
 
+#include "vncauth.h"
+
 #define RFB_GET_UINT32(ptr) GUINT32_FROM_BE (*(guint32 *)(ptr))
 #define RFB_GET_UINT16(ptr) GUINT16_FROM_BE (*(guint16 *)(ptr))
 #define RFB_GET_UINT8(ptr) (*(guint8 *)(ptr))
@@ -39,6 +41,7 @@ static gboolean rfb_decoder_state_send_client_initialisation (RfbDecoder *
     decoder);
 static gboolean rfb_decoder_state_wait_for_server_initialisation (RfbDecoder *
     decoder);
+static gboolean rfb_decoder_state_security_result (RfbDecoder * decoder);
 static gboolean rfb_decoder_state_normal (RfbDecoder * decoder);
 static gboolean rfb_decoder_state_framebuffer_update (RfbDecoder * decoder);
 static gboolean rfb_decoder_state_framebuffer_update_rectangle (RfbDecoder *
@@ -279,8 +282,7 @@ rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
    */
   if (decoder->protocol_major == 3 && decoder->protocol_minor == 3) {
     ret = rfb_bytestream_read (decoder->bytestream, &buffer, 4);
-    if (ret < 4)
-      return FALSE;
+    g_return_val_if_fail (ret == 4, FALSE);
 
     decoder->security_type = RFB_GET_UINT32 (buffer->data);
     GST_DEBUG ("security = %d", decoder->security_type);
@@ -294,15 +296,54 @@ rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
   switch (decoder->security_type) {
     case SECURITY_NONE:
       GST_DEBUG ("Security type is None");
+      /* \TODO version 3.8 goes to the security result */
+      decoder->state = rfb_decoder_state_send_client_initialisation;
       break;
     case SECURITY_VNC:
+        /**
+         * VNC authentication is to be used and protocol data is to be sent unencrypted. The
+         * server sends a random 16-byte challenge
+         */
       GST_DEBUG ("Security type is VNC Authentication");
-      /* \TODO Check if for the correct password */
+
+      ret = rfb_bytestream_read (decoder->bytestream, &buffer, 16);
+      g_return_val_if_fail (ret == 16, FALSE);
+      vncEncryptBytes ((unsigned char *) buffer->data, "testtest");
+      rfb_decoder_send (decoder, buffer->data, 16);
+
+      GST_DEBUG ("Encrypted challenge send to server");
+
+      decoder->state = rfb_decoder_state_security_result;
       break;
     default:
+      GST_INFO ("Security type is not known");
+      return FALSE;
       break;
   }
+  return TRUE;
+}
+
+/**
+ * The server sends a word to inform the client whether the security handshaking was
+ * successful.
+ */
+static gboolean
+rfb_decoder_state_security_result (RfbDecoder * decoder)
+{
+  RfbBuffer *buffer;
+  gint ret;
+
+  ret = rfb_bytestream_read (decoder->bytestream, &buffer, 4);
+  g_return_val_if_fail (ret == 4, FALSE);
+  if (RFB_GET_UINT32 (buffer->data) != 0) {
+    GST_INFO ("Security handshaking failed");
+    /* \TODO version 3.8 gives a reason why it failed */
+    return FALSE;
+  }
+
+  GST_DEBUG ("Security handshaking succesfull");
   decoder->state = rfb_decoder_state_send_client_initialisation;
+
   return TRUE;
 }
 
diff --git a/gst/librfb/vncauth.c b/gst/librfb/vncauth.c
new file mode 100644
index 00000000..19083088
--- /dev/null
+++ b/gst/librfb/vncauth.c
@@ -0,0 +1,166 @@
+/*
+ *  Copyright (C) 1999 AT&T Laboratories Cambridge.  All Rights Reserved.
+ *
+ *  This is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This software 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.
+ */
+
+/*
+ * vncauth.c - Functions for VNC password management and authentication.
+ */
+
+#include "config.h"
+#include "stdint.h"
+#include "stdio.h"
+#include "stdlib.h"
+#include "string.h"
+#include "time.h"
+#include "vncauth.h"
+#include "d3des.h"
+
+#include "sys/stat.h"
+
+
+/*
+ * We use a fixed key to store passwords, since we assume that our local
+ * file system is secure but nonetheless don't want to store passwords
+ * as plaintext.
+ */
+
+unsigned char fixedkey[8] = { 23, 82, 107, 6, 35, 78, 88, 7 };
+
+
+/*
+ * Encrypt a password and store it in a file.  Returns 0 if successful,
+ * 1 if the file could not be written.
+ */
+
+int32_t
+vncEncryptAndStorePasswd (char *passwd, char *fname)
+{
+  FILE *fp;
+  uint32_t i;
+  unsigned char encryptedPasswd[8];
+
+  if ((fp = fopen (fname, "w")) == NULL)
+    return 1;
+
+  chmod (fname, S_IRUSR | S_IWUSR);
+
+  /* pad password with nulls */
+
+  for (i = 0; i < 8; i++) {
+    if (i < strlen (passwd)) {
+      encryptedPasswd[i] = passwd[i];
+    } else {
+      encryptedPasswd[i] = 0;
+    }
+  }
+
+  /* Do encryption in-place - this way we overwrite our copy of the plaintext
+     password */
+
+  deskey (fixedkey, EN0);
+  des (encryptedPasswd, encryptedPasswd);
+
+  for (i = 0; i < 8; i++) {
+    putc (encryptedPasswd[i], fp);
+  }
+
+  fclose (fp);
+  return 0;
+}
+
+
+/*
+ * Decrypt a password from a file.  Returns a pointer to a newly allocated
+ * string containing the password or a null pointer if the password could
+ * not be retrieved for some reason.
+ */
+
+char *
+vncDecryptPasswdFromFile (char *fname)
+{
+  FILE *fp;
+  int32_t i, ch;
+  unsigned char *passwd = (unsigned char *) malloc (9);
+
+  if ((fp = fopen (fname, "r")) == NULL)
+    return NULL;
+
+  for (i = 0; i < 8; i++) {
+    ch = getc (fp);
+    if (ch == EOF) {
+      fclose (fp);
+      return NULL;
+    }
+    passwd[i] = ch;
+  }
+
+  fclose (fp);
+
+  deskey (fixedkey, DE1);
+  des (passwd, passwd);
+
+  passwd[8] = 0;
+
+  return (char *) passwd;
+}
+
+
+/*
+ * Generate CHALLENGESIZE random bytes for use in challenge-response
+ * authentication.
+ */
+
+void
+vncRandomBytes (unsigned char *bytes)
+{
+  int32_t i;
+  uint32_t seed = (uint32_t) time (0);
+
+  srandom (seed);
+  for (i = 0; i < CHALLENGESIZE; i++) {
+    bytes[i] = (unsigned char) (random () & 255);
+  }
+}
+
+
+/*
+ * Encrypt CHALLENGESIZE bytes in memory using a password.
+ */
+
+void
+vncEncryptBytes (unsigned char *bytes, char *passwd)
+{
+  unsigned char key[8];
+  uint32_t i;
+
+  /* key is simply password padded with nulls */
+
+  for (i = 0; i < 8; i++) {
+    if (i < strlen (passwd)) {
+      key[i] = passwd[i];
+    } else {
+      key[i] = 0;
+    }
+  }
+
+  deskey (key, EN0);
+
+  for (i = 0; i < CHALLENGESIZE; i += 8) {
+    des (bytes + i, bytes + i);
+  }
+}
diff --git a/gst/librfb/vncauth.h b/gst/librfb/vncauth.h
new file mode 100644
index 00000000..2a4deaeb
--- /dev/null
+++ b/gst/librfb/vncauth.h
@@ -0,0 +1,31 @@
+/*
+ *  Copyright (C) 1999 AT&T Laboratories Cambridge.  All Rights Reserved.
+ *
+ *  This is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This software 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 software; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ *  USA.
+ */
+
+/* 
+ * vncauth.h - describes the functions provided by the vncauth library.
+ */
+
+#define MAXPWLEN 8
+#define CHALLENGESIZE 16
+
+extern int vncEncryptAndStorePasswd(char *passwd, char *fname);
+extern char *vncDecryptPasswdFromFile(char *fname);
+extern void vncRandomBytes(unsigned char *bytes);
+extern void vncEncryptBytes(unsigned char *bytes, char *passwd);
+