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@@ -0,0 +1,294 @@
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+/* From Andy Tanenbaum's book "Computer Networks",
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+ rewritten in C
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+*/
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+
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+struct block {
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+ unsigned char b_data[64];
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+};
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+
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+struct ordering {
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+ unsigned char o_data[64];
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+};
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+
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+static struct block key;
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+
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+static struct ordering InitialTr = {
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+ 58,50,42,34,26,18,10, 2,60,52,44,36,28,20,12, 4,
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+ 62,54,46,38,30,22,14, 6,64,56,48,40,32,24,16, 8,
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+ 57,49,41,33,25,17, 9, 1,59,51,43,35,27,19,11, 3,
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+ 61,53,45,37,29,21,13, 5,63,55,47,39,31,23,15, 7,
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+};
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+
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+static struct ordering FinalTr = {
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+ 40, 8,48,16,56,24,64,32,39, 7,47,15,55,23,63,31,
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+ 38, 6,46,14,54,22,62,30,37, 5,45,13,53,21,61,29,
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+ 36, 4,44,12,52,20,60,28,35, 3,43,11,51,19,59,27,
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+ 34, 2,42,10,50,18,58,26,33, 1,41, 9,49,17,57,25,
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+};
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+
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+static struct ordering swap = {
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+ 33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
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+ 49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
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+ 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,
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+ 17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
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+};
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+
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+static struct ordering KeyTr1 = {
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+ 57,49,41,33,25,17, 9, 1,58,50,42,34,26,18,
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+ 10, 2,59,51,43,35,27,19,11, 3,60,52,44,36,
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+ 63,55,47,39,31,23,15, 7,62,54,46,38,30,22,
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+ 14, 6,61,53,45,37,29,21,13, 5,28,20,12, 4,
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+};
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+
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+static struct ordering KeyTr2 = {
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+ 14,17,11,24, 1, 5, 3,28,15, 6,21,10,
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+ 23,19,12, 4,26, 8,16, 7,27,20,13, 2,
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+ 41,52,31,37,47,55,30,40,51,45,33,48,
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+ 44,49,39,56,34,53,46,42,50,36,29,32,
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+};
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+
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+static struct ordering etr = {
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+ 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9,
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+ 8, 9,10,11,12,13,12,13,14,15,16,17,
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+ 16,17,18,19,20,21,20,21,22,23,24,25,
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+ 24,25,26,27,28,29,28,29,30,31,32, 1,
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+};
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+
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+static struct ordering ptr = {
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+ 16, 7,20,21,29,12,28,17, 1,15,23,26, 5,18,31,10,
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+ 2, 8,24,14,32,27, 3, 9,19,13,30, 6,22,11, 4,25,
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+};
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+
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+static unsigned char s_boxes[8][64] = {
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+{ 14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7,
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+ 0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8,
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+ 4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0,
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+ 15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13,
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+},
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+
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+{ 15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10,
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+ 3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5,
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+ 0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15,
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+ 13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9,
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+},
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+
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+{ 10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8,
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+ 13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1,
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+ 13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7,
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+ 1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12,
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+},
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+
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+{ 7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15,
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+ 13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9,
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+ 10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4,
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+ 3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14,
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+},
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+
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+{ 2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9,
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+ 14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6,
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+ 4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14,
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+ 11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3,
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+},
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+
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+{ 12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11,
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+ 10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8,
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+ 9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6,
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+ 4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13,
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+},
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+
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+{ 4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1,
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+ 13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6,
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+ 1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2,
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+ 6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12,
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+},
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+
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+{ 13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7,
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+ 1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2,
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+ 7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8,
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+ 2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11,
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+},
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+};
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+
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+static int rots[] = {
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+ 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,
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+};
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+
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+static
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+transpose(data, t, n)
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+ register struct block *data;
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+ register struct ordering *t;
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+ register int n;
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+{
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+ struct block x;
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+
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+ x = *data;
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+
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+ while (n-- > 0) {
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+ data->b_data[n] = x.b_data[t->o_data[n] - 1];
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+ }
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+}
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+
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+static
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+rotate(key)
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+ register struct block *key;
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+{
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+ register unsigned char *p = key->b_data;
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+ register unsigned char *ep = &(key->b_data[55]);
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+ int data0 = key->b_data[0], data28 = key->b_data[28];
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+
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+ while (p++ < ep) *(p-1) = *p;
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+ key->b_data[27] = data0;
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+ key->b_data[55] = data28;
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+}
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+
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+static struct ordering *EP = &etr;
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+
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+static
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+f(i, key, a, x)
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+ struct block *key, *a;
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+ register struct block *x;
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+{
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+ struct block e, ikey, y;
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+ int k;
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+ register unsigned char *p, *q, *r;
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+
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+ e = *a;
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+ transpose(&e, EP, 48);
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+ for (k = rots[i]; k; k--) rotate(key);
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+ ikey = *key;
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+ transpose(&ikey, &KeyTr2, 48);
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+ p = &(y.b_data[48]);
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+ q = &(e.b_data[48]);
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+ r = &(ikey.b_data[48]);
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+ while (p > y.b_data) {
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+ *--p = *--q ^ *--r;
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+ }
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+ q = x->b_data;
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+ for (k = 0; k < 8; k++) {
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+ register int xb, r;
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+
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+ r = *p++ << 5;
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+ r += *p++ << 3;
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+ r += *p++ << 2;
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+ r += *p++ << 1;
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+ r += *p++;
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+ r += *p++ << 4;
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+
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+ xb = s_boxes[k][r];
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+
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+ *q++ = (xb >> 3) & 1;
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+ *q++ = (xb>>2) & 1;
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+ *q++ = (xb>>1) & 1;
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+ *q++ = (xb & 1);
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+ }
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+ transpose(x, &ptr, 32);
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+}
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+
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+setkey(k)
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+ register char *k;
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+{
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+
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+ key = *((struct block *) k);
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+ transpose(&key, &KeyTr1, 56);
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+}
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+
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+encrypt(blck, edflag)
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+ char *blck;
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+{
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+ register struct block *p = (struct block *) blck;
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+ register int i;
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+
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+ transpose(p, &InitialTr, 64);
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+ for (i = 15; i>= 0; i--) {
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+ int j = edflag ? i : 15 - i;
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+ register int k;
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+ struct block b, x;
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+
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+ b = *p;
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+ for (k = 31; k >= 0; k--) {
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+ p->b_data[k] = b.b_data[k + 32];
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+ }
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+ f(j, &key, p, &x);
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+ for (k = 31; k >= 0; k--) {
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+ p->b_data[k+32] = b.b_data[k] ^ x.b_data[k];
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+ }
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+ }
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+ transpose(p, &swap, 64);
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+ transpose(p, &FinalTr, 64);
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+}
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+
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+char *
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+crypt(pw,salt)
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+ register char *pw;
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+ char *salt;
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+{
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+ /* Unfortunately, I had to look at the sources of V7 crypt.
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+ There was no other way to find out what this routine
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+ actually does.
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+ */
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+
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+ char pwb[66];
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+ static char result[16];
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+ register char *p = pwb;
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+ struct ordering new_etr;
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+ register int i;
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+
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+ while (*pw && p < &pwb[64]) {
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+ register int j = 7;
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+
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+ while (j--) {
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+ *p++ = (*pw >> j) & 01;
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+ }
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+ pw++;
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+ *p++ = 0;
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+ }
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+ while (p < &pwb[64]) *p++ = 0;
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+
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+ setkey(p = pwb);
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+
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+ while (p < &pwb[66]) *p++ = 0;
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+
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+ new_etr = etr;
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+ EP = &new_etr;
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+ for (i = 0; i < 2; i++) {
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+ register char c = *salt++;
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+ register int j;
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+
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+ result[i] = c;
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+ if ( c > 'Z') c -= 6 + 7 + '.'; /* c was a lower case letter */
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+ else if ( c > '9') c -= 7 + '.';/* c was upper case letter */
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+ else c -= '.'; /* c was digit, '.' or '/'. */
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+ /* now, 0 <= c <= 63 */
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+ for (j = 0; j < 6; j++) {
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+ if ((c >> j) & 01) {
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+ int t = 6*i + j;
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+ int temp = new_etr.o_data[t];
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+ new_etr.o_data[t] = new_etr.o_data[t+24];
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+ new_etr.o_data[t+24] = temp;
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+ }
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+ }
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+ }
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+
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+ if (result[1] == 0) result[1] = result[0];
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+
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+ for (i = 0; i < 25; i++) encrypt(pwb,0);
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+ EP = &etr;
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+
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+ p = pwb;
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+ pw = result+2;
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+ while (p < &pwb[66]) {
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+ register int c = 0;
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+ register int j = 6;
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+
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+ while (j--) {
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+ c <<= 1;
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+ c |= *p++;
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+ }
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+ c += '.'; /* becomes >= '.' */
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+ if (c > '9') c += 7; /* not in [./0-9], becomes upper */
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+ if (c > 'Z') c += 6; /* not in [A-Z], becomes lower */
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+ *pw++ = c;
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+ }
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+ *pw = 0;
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+ return result;
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+}
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