Resurrected twofishdata.c, earlier known as generate_q.c.

1 files changed, 126 insertions, 0 deletions

diff --git a/twofishdata.c b/twofishdata.c
new file mode 100644
index 00000000..475cbef0
--- /dev/null
+++ b/twofishdata.c
@@ -0,0 +1,126 @@
+/*
+ * twofishdata.c - Generates the permutations q0 and q1 for twofish.
+ * Copyright (C) 1999 Ruud de Rooij <ruud@debian.org>
+ *
+ * This program 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 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
+ */
+
+#include <stdio.h>
+
+#include "nettle-stdint.h"
+
+#define ror4(x) (((x) >> 1) | (((x) & 1) << 3))
+
+static uint8_t q0(uint8_t x)
+{
+    static const uint8_t t0[16] = {
+      0x8, 0x1, 0x7, 0xD, 0x6, 0xF, 0x3, 0x2,
+      0x0, 0xB, 0x5, 0x9, 0xE, 0xC, 0xA, 0x4
+    };
+    static const uint8_t t1[16] = {
+      0xE, 0xC, 0xB, 0x8, 0x1, 0x2, 0x3, 0x5,
+      0xF, 0x4, 0xA, 0x6, 0x7, 0x0, 0x9, 0xD
+    };
+    static const uint8_t t2[16] = {
+      0xB, 0xA, 0x5, 0xE, 0x6, 0xD, 0x9, 0x0,
+      0xC, 0x8, 0xF, 0x3, 0x2, 0x4, 0x7, 0x1
+    };
+    static const uint8_t t3[16] = {
+      0xD, 0x7, 0xF, 0x4, 0x1, 0x2, 0x6, 0xE,
+      0x9, 0xB, 0x3, 0x0, 0x8, 0x5, 0xC, 0xA
+    };
+
+    uint8_t a0 = x / 16;
+    uint8_t b0 = x % 16;
+
+    uint8_t a1 = a0 ^ b0;
+    uint8_t b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
+
+    uint8_t a2 = t0[a1];
+    uint8_t b2 = t1[b1];
+
+    uint8_t a3 = a2 ^ b2;
+    uint8_t b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
+
+    uint8_t a4 = t2[a3];
+    uint8_t b4 = t3[b3];
+
+    uint8_t y = 16*b4 + a4;
+
+    return y;
+}
+
+static uint8_t q1(uint8_t x)
+{
+  static const uint8_t t0[16] = {
+    0x2, 0x8, 0xB, 0xD, 0xF, 0x7, 0x6, 0xE,
+    0x3, 0x1, 0x9, 0x4, 0x0, 0xA, 0xC, 0x5
+  };
+  static const uint8_t t1[16] = {
+    0x1, 0xE, 0x2, 0xB, 0x4, 0xC, 0x3, 0x7,
+    0x6, 0xD, 0xA, 0x5, 0xF, 0x9, 0x0, 0x8
+  };
+  static const uint8_t t2[16] = {
+    0x4, 0xC, 0x7, 0x5, 0x1, 0x6, 0x9, 0xA,
+    0x0, 0xE, 0xD, 0x8, 0x2, 0xB, 0x3, 0xF
+  };
+  static const uint8_t t3[16] = {
+    0xB, 0x9, 0x5, 0x1, 0xC, 0x3, 0xD, 0xE,
+    0x6, 0x4, 0x7, 0xF, 0x2, 0x0, 0x8, 0xA
+  };
+
+  uint8_t a0 = x / 16;
+  uint8_t b0 = x % 16;
+
+  uint8_t a1 = a0 ^ b0;
+  uint8_t b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
+
+  uint8_t a2 = t0[a1];
+  uint8_t b2 = t1[b1];
+
+  uint8_t a3 = a2 ^ b2;
+  uint8_t b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
+
+  uint8_t a4 = t2[a3];
+  uint8_t b4 = t3[b3];
+
+  uint8_t y = 16*b4 + a4;
+
+  return y;
+}
+
+int
+main(void)
+{
+  unsigned i, j;
+
+  printf("static const uint8_t q0[256] = {");
+  for (i = 0; i < 256; i++) {
+    if ( (i % 8) == 0)
+      printf("\n  ");
+    printf("0x%02X,", q0(i));
+  }
+  printf("\n};\n\n");
+
+  printf("static const uint8_t q1[256] = {");
+  for (i = 0; i < 256; i++) {
+    if ( (i % 8) == 0)
+      printf("\n  ");
+    printf("0x%02X,", q1(i));
+  }
+  printf("\n};\n");
+
+  return 0;
+}