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gen-des-tables.c
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gen-des-tables.c
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/*
* FreeSec: libcrypt for NetBSD
*
* Copyright (c) 1994 David Burren
* All rights reserved.
*
* Adapted for FreeBSD-2.0 by Geoffrey M. Rehmet
* this file should now *only* export crypt(), in order to make
* binaries of libcrypt exportable from the USA
*
* Adapted for FreeBSD-4.0 by Mark R V Murray
* this file should now *only* export crypt_des(), in order to make
* a module that can be optionally included in libcrypt.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of other contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This is an original implementation of the DES and the crypt(3) interfaces
* by David Burren <[email protected]>.
*/
/*
* This program can regenerate the tables in alg-des-tables.c.
* It is preserved as documentation, but it should no longer be
* necessary to run it.
*/
#include "crypt-port.h"
#include <inttypes.h>
#include <stdio.h>
static const uint8_t IP[64] =
{
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
};
static uint8_t inv_key_perm[64];
static const uint8_t key_perm[56] =
{
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,
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
};
static uint8_t inv_comp_perm[56];
static const uint8_t comp_perm[48] =
{
14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
};
/*
* No E box is used, as it's replaced by some ANDs, shifts, and ORs.
*/
static uint8_t u_sbox[8][64];
static const uint8_t sbox[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
}
};
static uint8_t un_pbox[32];
static const uint8_t pbox[32] =
{
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
};
static const uint32_t *bits28, *bits24;
static uint8_t init_perm[64], final_perm[64];
static const uint32_t bits32[32] =
{
0x80000000, 0x40000000, 0x20000000, 0x10000000,
0x08000000, 0x04000000, 0x02000000, 0x01000000,
0x00800000, 0x00400000, 0x00200000, 0x00100000,
0x00080000, 0x00040000, 0x00020000, 0x00010000,
0x00008000, 0x00004000, 0x00002000, 0x00001000,
0x00000800, 0x00000400, 0x00000200, 0x00000100,
0x00000080, 0x00000040, 0x00000020, 0x00000010,
0x00000008, 0x00000004, 0x00000002, 0x00000001
};
static const uint8_t bits8[8] =
{ 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
static uint8_t m_sbox_[4][4096];
static uint32_t ip_maskl_[8][256], ip_maskr_[8][256];
static uint32_t fp_maskl_[8][256], fp_maskr_[8][256];
static uint32_t key_perm_maskl_[8][128], key_perm_maskr_[8][128];
static uint32_t comp_maskl_[8][128], comp_maskr_[8][128];
static uint32_t psbox_[4][256];
static void
des_init(void)
{
int i, j, b, k, inbit, obit;
uint32_t *p, *il, *ir, *fl, *fr;
bits24 = (bits28 = bits32 + 4) + 4;
/*
* Invert the S-boxes, reordering the input bits.
*/
for (i = 0; i < 8; i++)
for (j = 0; j < 64; j++)
{
b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf);
u_sbox[i][j] = sbox[i][b];
}
/*
* Convert the inverted S-boxes into 4 arrays of 8 bits.
* Each will handle 12 bits of the S-box input.
*/
for (b = 0; b < 4; b++)
for (i = 0; i < 64; i++)
for (j = 0; j < 64; j++)
m_sbox_[b][(i << 6) | j] =
(uint8_t)((u_sbox[(b << 1)][i] << 4) |
u_sbox[(b << 1) + 1][j]);
/*
* Set up the initial & final permutations into a useful form, and
* initialise the inverted key permutation.
*/
for (i = 0; i < 64; i++)
{
final_perm[i] = (uint8_t)(IP[i] - 1);
init_perm[final_perm[i]] = (uint8_t)i;
inv_key_perm[i] = 255;
}
/*
* Invert the key permutation and initialise the inverted key
* compression permutation.
*/
for (i = 0; i < 56; i++)
{
inv_key_perm[key_perm[i] - 1] = (uint8_t)i;
inv_comp_perm[i] = 255;
}
/*
* Invert the key compression permutation.
*/
for (i = 0; i < 48; i++)
{
inv_comp_perm[comp_perm[i] - 1] = (uint8_t)i;
}
/*
* Set up the OR-mask arrays for the initial and final permutations,
* and for the key initial and compression permutations.
*/
for (k = 0; k < 8; k++)
{
for (i = 0; i < 256; i++)
{
*(il = &ip_maskl_[k][i]) = 0L;
*(ir = &ip_maskr_[k][i]) = 0L;
*(fl = &fp_maskl_[k][i]) = 0L;
*(fr = &fp_maskr_[k][i]) = 0L;
for (j = 0; j < 8; j++)
{
inbit = 8 * k + j;
if (i & bits8[j])
{
if ((obit = init_perm[inbit]) < 32)
*il |= bits32[obit];
else
*ir |= bits32[obit-32];
if ((obit = final_perm[inbit]) < 32)
*fl |= bits32[obit];
else
*fr |= bits32[obit - 32];
}
}
}
for (i = 0; i < 128; i++)
{
*(il = &key_perm_maskl_[k][i]) = 0L;
*(ir = &key_perm_maskr_[k][i]) = 0L;
for (j = 0; j < 7; j++)
{
inbit = 8 * k + j;
if (i & bits8[j + 1])
{
if ((obit = inv_key_perm[inbit]) == 255)
continue;
if (obit < 28)
*il |= bits28[obit];
else
*ir |= bits28[obit - 28];
}
}
*(il = &comp_maskl_[k][i]) = 0L;
*(ir = &comp_maskr_[k][i]) = 0L;
for (j = 0; j < 7; j++)
{
inbit = 7 * k + j;
if (i & bits8[j + 1])
{
if ((obit=inv_comp_perm[inbit]) == 255)
continue;
if (obit < 24)
*il |= bits24[obit];
else
*ir |= bits24[obit - 24];
}
}
}
}
/*
* Invert the P-box permutation, and convert into OR-masks for
* handling the output of the S-box arrays setup above.
*/
for (i = 0; i < 32; i++)
un_pbox[pbox[i] - 1] = (uint8_t)i;
for (b = 0; b < 4; b++)
for (i = 0; i < 256; i++)
{
*(p = &psbox_[b][i]) = 0L;
for (j = 0; j < 8; j++)
{
if (i & bits8[j])
*p |= bits32[un_pbox[8 * b + j]];
}
}
}
static void
write_table_u8(size_t m, size_t n, const uint8_t *tbl, const char *name)
{
printf("\nconst uint8_t %s[%zu][%zu] = {\n", name, m, n);
for (size_t i = 0; i < m; i++)
{
fputs(" {", stdout);
for (size_t j = 0; j < n; j++)
{
if (j % 12 == 0)
fputs("\n ", stdout);
printf(" 0x%02x,", (unsigned int)tbl[i*n + j]);
}
puts("\n },");
}
puts("};");
}
static void
write_table_u32(size_t m, size_t n, const uint32_t *tbl, const char *name)
{
printf("\nconst uint32_t %s[%zu][%zu] = {\n", name, m, n);
for (size_t i = 0; i < m; i++)
{
fputs(" {", stdout);
for (size_t j = 0; j < n; j++)
{
if (j % 6 == 0)
fputs("\n ", stdout);
printf(" 0x%08"PRIx32",", tbl[i*n + j]);
}
puts("\n },");
}
puts("};");
}
int
main(void)
{
des_init();
write_table_u8(4, 4096, &m_sbox_[0][0], "m_sbox");
write_table_u32(8, 256, &ip_maskl_[0][0], "ip_maskl");
write_table_u32(8, 256, &ip_maskr_[0][0], "ip_maskr");
write_table_u32(8, 256, &fp_maskl_[0][0], "fp_maskl");
write_table_u32(8, 256, &fp_maskr_[0][0], "fp_maskr");
write_table_u32(8, 128, &key_perm_maskl_[0][0], "key_perm_maskl");
write_table_u32(8, 128, &key_perm_maskr_[0][0], "key_perm_maskr");
write_table_u32(8, 128, &comp_maskl_[0][0], "comp_maskl");
write_table_u32(8, 128, &comp_maskr_[0][0], "comp_maskr");
write_table_u32(4, 256, &psbox_[0][0], "psbox");
}