--- XFree86-4.0.1/xc/config/cf/xf86site.def~	Wed Nov  8 18:24:28 2000
+++ XFree86-4.0.1/xc/config/cf/xf86site.def	Wed Nov  8 18:37:12 2000
@@ -555,8 +555,8 @@
 /*
  * If you want XDMAUTH support (if you have Wraphelp.c), uncomment this.
  *
-#define HasXdmAuth		YES
  */
+#define HasXdmAuth		YES
 
 /*
  * If you have Linux DECnet support, and want to build XFree86 with support
--- /dev/null	Tue May 27 20:49:58 1997
+++ XFree86-4.0.1/xc/lib/Xdmcp/Wraphelp.c	Sat Feb 26 02:04:11 2000
@@ -0,0 +1,401 @@
+/*
+ * This program implements the
+ * Proposed Federal Information Processing
+ *  Data Encryption Standard.
+ * See Federal Register, March 17, 1975 (40FR12134)
+ */
+
+/*
+ * Initial permutation,
+ */
+static	char	IP[] = {
+	58,50,42,34,26,18,10, 2,
+	60,52,44,36,28,20,12, 4,
+	62,54,46,38,30,22,14, 6,
+	64,56,48,40,32,24,16, 8,
+	57,49,41,33,25,17, 9, 1,
+	59,51,43,35,27,19,11, 3,
+	61,53,45,37,29,21,13, 5,
+	63,55,47,39,31,23,15, 7,
+};
+
+/*
+ * Final permutation, FP = IP^(-1)
+ */
+static	char	FP[] = {
+	40, 8,48,16,56,24,64,32,
+	39, 7,47,15,55,23,63,31,
+	38, 6,46,14,54,22,62,30,
+	37, 5,45,13,53,21,61,29,
+	36, 4,44,12,52,20,60,28,
+	35, 3,43,11,51,19,59,27,
+	34, 2,42,10,50,18,58,26,
+	33, 1,41, 9,49,17,57,25,
+};
+
+/*
+ * Permuted-choice 1 from the key bits
+ * to yield C and D.
+ * Note that bits 8,16... are left out:
+ * They are intended for a parity check.
+ */
+static	char	PC1_C[] = {
+	57,49,41,33,25,17, 9,
+	 1,58,50,42,34,26,18,
+	10, 2,59,51,43,35,27,
+	19,11, 3,60,52,44,36,
+};
+
+static	char	PC1_D[] = {
+	63,55,47,39,31,23,15,
+	 7,62,54,46,38,30,22,
+	14, 6,61,53,45,37,29,
+	21,13, 5,28,20,12, 4,
+};
+
+/*
+ * Sequence of shifts used for the key schedule.
+*/
+static	char	shifts[] = {
+	1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,
+};
+
+/*
+ * Permuted-choice 2, to pick out the bits from
+ * the CD array that generate the key schedule.
+ */
+static	char	PC2_C[] = {
+	14,17,11,24, 1, 5,
+	 3,28,15, 6,21,10,
+	23,19,12, 4,26, 8,
+	16, 7,27,20,13, 2,
+};
+
+static	char	PC2_D[] = {
+	41,52,31,37,47,55,
+	30,40,51,45,33,48,
+	44,49,39,56,34,53,
+	46,42,50,36,29,32,
+};
+
+/*
+ * The C and D arrays used to calculate the key schedule.
+ */
+
+static	char	C[28];
+static	char	D[28];
+
+/*
+ * The key schedule.
+ * Generated from the key.
+ */
+static	char	KS[16][48];
+
+/*
+ * The E bit-selection table.
+ */
+static	char	E[48];
+static	char	e[] = {
+	32, 1, 2, 3, 4, 5,
+	 4, 5, 6, 7, 8, 9,
+	 8, 9,10,11,12,13,
+	12,13,14,15,16,17,
+	16,17,18,19,20,21,
+	20,21,22,23,24,25,
+	24,25,26,27,28,29,
+	28,29,30,31,32, 1,
+};
+
+/*
+ * Set up the key schedule from the key.
+ */
+
+static
+setkey(key)
+char *key;
+{
+	int	i, j, k;
+	int	t;
+	char	*ptr;
+
+	/*
+	 * First, generate C and D by permuting
+	 * the key.  The low order bit of each
+	 * 8-bit char is not used, so C and D are only 28
+	 * bits apiece.
+	 */
+	for (i=0; i<28; i++) {
+		C[i] = key[PC1_C[i]-1];
+		D[i] = key[PC1_D[i]-1];
+	}
+	/*
+	 * To generate Ki, rotate C and D according
+	 * to schedule and pick up a permutation
+	 * using PC2.
+	 */
+	for (i=0; i<16; i++) {
+		/*
+		 * rotate.
+		 */
+		for (k=0; k<shifts[i]; k++) {
+			t = C[0];
+			ptr = C;
+			for (j=0; j<28-1; j++)
+			{
+				*ptr = ptr[1];
+				ptr++;
+			}
+			C[27] = t;
+			t = D[0];
+			ptr = D;
+			for (j=0; j<28-1; j++)
+			{
+				*ptr = ptr[1];
+				ptr++;
+			}
+			D[27] = t;
+		}
+		/*
+		 * get Ki. Note C and D are concatenated.
+		 */
+		ptr = &KS[i][0];
+		for (j=0; j<24; j++) {
+			ptr[j] = C[PC2_C[j]-1];
+			ptr[j+24] = D[PC2_D[j]-28-1];
+		}
+	}
+
+	for(i=0;i<48;i++)
+		E[i] = e[i];
+}
+
+/*
+ * The 8 selection functions.
+ * For some reason, they give a 0-origin
+ * index, unlike everything else.
+ */
+static	char	S[8][64] = {
+	14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7,
+	 0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8,
+	 4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0,
+	15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13,
+
+	15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10,
+	 3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5,
+	 0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15,
+	13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9,
+
+	10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8,
+	13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1,
+	13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7,
+	 1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12,
+
+	 7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15,
+	13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9,
+	10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4,
+	 3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14,
+
+	 2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9,
+	14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6,
+	 4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14,
+	11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3,
+
+	12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11,
+	10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8,
+	 9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6,
+	 4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13,
+
+	 4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1,
+	13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6,
+	 1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2,
+	 6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12,
+
+	13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7,
+	 1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2,
+	 7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8,
+	 2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11,
+};
+
+/*
+ * P is a permutation on the selected combination
+ * of the current L and key.
+ */
+static	char	P[] = {
+	16, 7,20,21,
+	29,12,28,17,
+	 1,15,23,26,
+	 5,18,31,10,
+	 2, 8,24,14,
+	32,27, 3, 9,
+	19,13,30, 6,
+	22,11, 4,25,
+};
+
+/*
+ * The current block, divided into 2 halves.
+ */
+
+static	char	L[64];
+#define R   (L + 32)
+static	char	tempL[32];
+static	char	f[32];
+
+/*
+ * The combination of the key and the input, before selection.
+ */
+static	char	preS[48];
+
+/*
+ * The payoff: encrypt a block.
+ */
+
+static
+encrypt (block, edflag)
+char *block;
+{
+	int i, ii;
+	register t, j, k;
+
+	/*
+	 * First, permute the bits in the input
+	 */
+	for (j=0; j<64; j++)
+		L[j] = block[IP[j]-1];
+	/*
+	 * Perform an encryption operation 16 times.
+	 */
+	for (ii=0; ii<16; ii++) {
+/*		print_bits ("L R", L); */
+		/*
+		 * Set direction
+		 */
+		if (edflag)
+			i = 15-ii;
+		else
+			i = ii;
+		/*
+		 * Save the R array,
+		 * which will be the new L.
+		 */
+		for (j=0; j<32; j++)
+			tempL[j] = R[j];
+		/*
+		 * Expand R to 48 bits using the E selector;
+		 * exclusive-or with the current key bits.
+		 */
+		for (j=0; j<48; j++)
+			preS[j] = R[E[j]-1] ^ KS[i][j];
+		/*
+		 * The pre-select bits are now considered
+		 * in 8 groups of 6 bits each.
+		 * The 8 selection functions map these
+		 * 6-bit quantities into 4-bit quantities
+		 * and the results permuted
+		 * to make an f(R, K).
+		 * The indexing into the selection functions
+		 * is peculiar; it could be simplified by
+		 * rewriting the tables.
+		 */
+		for (j=0; j<8; j++) {
+			t = 6*j;
+			k = S[j][(preS[t+0]<<5)+
+				(preS[t+1]<<3)+
+				(preS[t+2]<<2)+
+				(preS[t+3]<<1)+
+				(preS[t+4]<<0)+
+				(preS[t+5]<<4)];
+			t = 4*j;
+			f[t+0] = (k>>3)&01;
+			f[t+1] = (k>>2)&01;
+			f[t+2] = (k>>1)&01;
+			f[t+3] = (k>>0)&01;
+		}
+		/*
+		 * The new R is L ^ f(R, K).
+		 * The f here has to be permuted first, though.
+		 */
+		for (j=0; j<32; j++)
+			R[j] = L[j] ^ f[P[j]-1];
+		/*
+		 * Finally, the new L (the original R)
+		 * is copied back.
+		 */
+		for (j=0; j<32; j++)
+			L[j] = tempL[j];
+	}
+	/*
+	 * The output L and R are reversed.
+	 */
+	for (j=0; j<32; j++) {
+		t = L[j];
+		L[j] = R[j];
+		R[j] = t;
+	}
+	/*
+	 * The final output
+	 * gets the inverse permutation of the very original.
+	 */
+	for (j=0; j<64; j++)
+		block[j] = L[FP[j]-1];
+}
+
+static
+bytes_to_bits (bytes, bits)
+    unsigned char   *bytes;
+    char	    *bits;
+{
+    int	    bit, byte, value;
+
+    for (byte = 0; byte < 8; byte++)
+    {
+	value = *bytes++;
+	for (bit = 0; bit < 8; bit++)
+	    *bits++ = (value >> (7-bit)) & 1;
+    }
+}
+
+static
+bits_to_bytes (bits, bytes)
+    char	    *bits;
+    unsigned char   *bytes;
+{
+    int	    bit, byte, value;
+
+    for (byte = 0; byte < 8; byte++)
+    {
+	value = 0;
+	for (bit = 0; bit < 8; bit++)
+	    value |= *bits++ << (7-bit);
+	*bytes++ = value;
+    }
+}
+
+/*
+ * Interface compatible with Kerberos DES implementation
+ */
+
+# include   "Wrap.h"
+
+/*ARGSUSED*/
+_XdmcpAuthSetup (key, schedule)
+    auth_cblock		key;
+    auth_wrapper_schedule	schedule;
+{
+    char    expand_key[64];
+
+    bytes_to_bits ((unsigned char *) key, expand_key);
+    setkey (expand_key);
+}
+
+/*ARGSUSED*/
+_XdmcpAuthDoIt (input, output, schedule, edflag)
+    auth_cblock		input, output;
+    auth_wrapper_schedule	schedule;
+    int			edflag;
+{
+    char    expand_input[64];
+
+    bytes_to_bits ((unsigned char *) input, expand_input);
+    encrypt (expand_input, !edflag);
+    bits_to_bytes (expand_input, (unsigned char *) output);
+}