From 245bfdef8fe5a758d7ef94874e54914666f5f16a Mon Sep 17 00:00:00 2001
From: mdw <mdw>
Date: Sat, 17 Jun 2000 10:47:28 +0000
Subject: [PATCH] Emits Blowfish initial key data, derived from the digits of
 pi.

---
 blowfish-mktab.c | 194 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 194 insertions(+)
 create mode 100644 blowfish-mktab.c

diff --git a/blowfish-mktab.c b/blowfish-mktab.c
new file mode 100644
index 0000000..6d1015d
--- /dev/null
+++ b/blowfish-mktab.c
@@ -0,0 +1,194 @@
+/* -*-c-*-
+ *
+ * $Id: blowfish-mktab.c,v 1.1 2000/06/17 10:47:28 mdw Exp $
+ *
+ * Build Blowfish key table
+ *
+ * (c) 2000 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------* 
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ * 
+ * Catacomb 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 Library General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Revision history --------------------------------------------------* 
+ *
+ * $Log: blowfish-mktab.c,v $
+ * Revision 1.1  2000/06/17 10:47:28  mdw
+ * Emits Blowfish initial key data, derived from the digits of pi.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <mLib/bits.h>
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @spigot@ --- *
+ *
+ * Arguments:	@uint32 *buf@ = pointer to the output buffer
+ *		@size_t n@ = number of output digits wanted
+ *
+ * Returns:	---
+ *
+ * Use:		Writes digits of %$\pi$% to the given array.  The algorithm
+ *		is based on the Spigot algorithm by Stanley Rabinowitz and
+ *		Stan Wagon, published in Amer.Math.Monthly, March 1995, with
+ *		bug fixes by C. Haenel.  I then bodged it to output hex
+ *		digits rather than decimal ones, and to leave off the initial
+ *		`3'.
+ *
+ *		I've not analysed the algorithm very much.
+ */
+
+#define SPIGOT_WORDS (18 + 4 * 256ul)
+#define SPIGOT_BITS 8
+#define SPIGOT_RADIX (1ul << SPIGOT_BITS)
+#define SPIGOT_BUFLEN (SPIGOT_WORDS * 32)
+
+static void spigot(uint32 *buf, size_t n)
+{
+  uint32 acc = 0;
+  int b = -1;
+  unsigned a[SPIGOT_BUFLEN] = { 0 };
+  uint32 p = 0;
+  unsigned f = 0;
+  unsigned max = 32 * n;
+  size_t step = n / 60;
+
+  fputs("[                                                             ]\r[",
+	stderr);
+
+#define EMIT(z) do {							\
+  if (b == -1)								\
+    b = 0;								\
+  else {								\
+    acc = (acc << SPIGOT_BITS) | (z);					\
+    b += SPIGOT_BITS;							\
+    if (b == 32) {							\
+      *buf++ = acc;							\
+      acc = 0;								\
+      b = 0;								\
+      n--;								\
+      if (!n)								\
+	goto done;							\
+      if (n % step == 0)						\
+	fputc('.', stderr);						\
+    }									\
+  }									\
+} while (0)
+
+  while (n) {
+    uint32 q = 0;
+    uint32 i;
+    uint32 x;
+    uint32 k = max * 2 - 1;
+
+    for (i = max; i; i--) {
+      x = (b == -1 ? SPIGOT_RADIX * 2 : a[i - 1] << SPIGOT_BITS) + q * i;
+      q = x / k;
+      a[i - 1] = x - q * k;
+      k -= 2;
+    }
+
+    k = x & (SPIGOT_RADIX - 1);
+    if (k == SPIGOT_RADIX - 1)
+      f++;
+    else {
+      EMIT(p + (x >> SPIGOT_BITS));
+      if (f) {
+	unsigned d = (x >= SPIGOT_RADIX ? 0 : SPIGOT_RADIX - 1);
+	while (f) {
+	  EMIT(d);
+	  f--;
+	}
+      }
+      p = k;
+    }
+  }
+
+done:
+  fputc('\n', stderr);
+
+#undef EMIT
+}
+
+/* --- @main@ --- */
+
+int main(void)
+{
+  uint32 dbuf[SPIGOT_WORDS];
+  int i, j;
+  uint32 *d = dbuf;
+
+  spigot(d, SPIGOT_WORDS);
+
+  fputs("\
+/* -*-c-*-\n\
+ *\n\
+ * Blowfish initial key table [generated]\n\
+ */\n\
+\n\
+#ifndef CATACOMB_BLOWFISH_TAB_H\n\
+#define CATACOMB_BLOWFISH_TAB_H\n\
+\n\
+#define BLOWFISH_IKEY {							\\\n\
+  { ", stdout);
+
+  for (i = 0; i < 18; i++) {
+    printf("0x%08x", *d++);
+    if (i == 17)
+      fputs(" },						\\\n\
+									\\\n\
+  { ", stdout);
+    else if (i % 4 == 3)
+      fputs(",			\\\n    ", stdout);
+    else
+      fputs(", ", stdout);
+  }
+
+  for (j = 0; j < 4; j++) {
+    for (i = 0; i < 256; i++) {
+    printf("0x%08x", *d++);
+    if (i == 255) {
+      if (j == 3)
+	fputs(" }			\\\n}\n\n#endif\n", stdout);
+      else
+	fputs(" },			\\\n\
+									\\\n\
+  { ", stdout);
+    } else if (i % 4 == 3)
+      fputs(",			\\\n    ", stdout);
+    else
+      fputs(", ", stdout);
+    }
+  }
+
+  if (fclose(stdout)) {
+    fprintf(stderr, "error writing data\n");
+    exit(EXIT_FAILURE);
+  }
+  return (0);
+}
+
+/*----- That's all, folks -------------------------------------------------*/
-- 
2.11.0