mknewpc2.c
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上传日期:2007-01-12
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- /*
- * mknewpc2.c
- *
- * Generate PC-2 tables for DES-150 library
- *
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the DES-150 library.
- *
- * The Initial Developer of the Original Code is Nelson B. Bolyard,
- * nelsonb@iname.com. Portions created by Nelson B. Bolyard are
- * Copyright (C) 1990, 2000 Nelson B. Bolyard, All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the GPL.
- */
- typedef unsigned char BYTE;
- typedef unsigned int HALF;
- #define DES_ENCRYPT 0
- #define DES_DECRYPT 1
- /* two 28-bit registers defined in key schedule production process */
- static HALF C0, D0;
- static HALF L0, R0;
- /* key schedule, 16 internal keys, each with 8 6-bit parts */
- static BYTE KS [8] [16];
- /*
- * This table takes the 56 bits in C0 and D0 and shows show they are
- * permuted into the 8 6-bit parts of the key in the key schedule.
- * The bits of C0 are numbered left to right, 1-28.
- * The bits of D0 are numbered left to right, 29-56.
- * Zeros in this table represent bits that are always zero.
- * Note that all the bits in the first 4 rows come from C0,
- * and all the bits in the second 4 rows come from D0.
- */
- static const BYTE PC2[64] = {
- 14, 17, 11, 24, 1, 5, 0, 0, /* S1 */
- 3, 28, 15, 6, 21, 10, 0, 0, /* S2 */
- 23, 19, 12, 4, 26, 8, 0, 0, /* S3 */
- 16, 7, 27, 20, 13, 2, 0, 0, /* S4 */
- 41, 52, 31, 37, 47, 55, 0, 0, /* S5 */
- 30, 40, 51, 45, 33, 48, 0, 0, /* S6 */
- 44, 49, 39, 56, 34, 53, 0, 0, /* S7 */
- 46, 42, 50, 36, 29, 32, 0, 0 /* S8 */
- };
- /* This table represents the same info as PC2, except that
- * The bits of C0 and D0 are each numbered right to left, 0-27.
- * -1 values indicate bits that are always zero.
- * As before all the bits in the first 4 rows come from C0,
- * and all the bits in the second 4 rows come from D0.
- */
- static signed char PC2a[64] = {
- /* bits of C0 */
- 14, 11, 17, 4, 27, 23, -1, -1, /* S1 */
- 25, 0, 13, 22, 7, 18, -1, -1, /* S2 */
- 5, 9, 16, 24, 2, 20, -1, -1, /* S3 */
- 12, 21, 1, 8, 15, 26, -1, -1, /* S4 */
- /* bits of D0 */
- 15, 4, 25, 19, 9, 1, -1, -1, /* S5 */
- 26, 16, 5, 11, 23, 8, -1, -1, /* S6 */
- 12, 7, 17, 0, 22, 3, -1, -1, /* S7 */
- 10, 14, 6, 20, 27, 24, -1, -1 /* S8 */
- };
- /* This table represents the same info as PC2a, except that
- * The order of of the rows has been changed to increase the efficiency
- * with which the key sechedule is created.
- * Fewer shifts and ANDs are required to make the KS from these.
- */
- static const signed char PC2b[64] = {
- /* bits of C0 */
- 14, 11, 17, 4, 27, 23, -1, -1, /* S1 */
- 5, 9, 16, 24, 2, 20, -1, -1, /* S3 */
- 25, 0, 13, 22, 7, 18, -1, -1, /* S2 */
- 12, 21, 1, 8, 15, 26, -1, -1, /* S4 */
- /* bits of D0 */
- 26, 16, 5, 11, 23, 8, -1, -1, /* S6 */
- 10, 14, 6, 20, 27, 24, -1, -1, /* S8 */
- 15, 4, 25, 19, 9, 1, -1, -1, /* S5 */
- 12, 7, 17, 0, 22, 3, -1, -1 /* S7 */
- };
- /* Only 24 of the 28 bits in C0 and D0 are used in PC2.
- * The used bits of C0 and D0 are grouped into 4 groups of 6,
- * so that the PC2 permutation can be accomplished with 4 lookups
- * in tables of 64 entries.
- * The following table shows how the bits of C0 and D0 are grouped
- * into indexes for the respective table lookups.
- * Bits are numbered right-to-left, 0-27, as in PC2b.
- */
- static BYTE NDX[48] = {
- /* Bits of C0 */
- 27, 26, 25, 24, 23, 22, /* C0 table 0 */
- 18, 17, 16, 15, 14, 13, /* C0 table 1 */
- 9, 8, 7, 2, 1, 0, /* C0 table 2 */
- 5, 4, 21, 20, 12, 11, /* C0 table 3 */
- /* bits of D0 */
- 27, 26, 25, 24, 23, 22, /* D0 table 0 */
- 20, 19, 17, 16, 15, 14, /* D0 table 1 */
- 12, 11, 10, 9, 8, 7, /* D0 table 2 */
- 6, 5, 4, 3, 1, 0 /* D0 table 3 */
- };
- /* Here's the code that does that grouping.
- left = PC2LOOKUP(0, 0, ((c0 >> 22) & 0x3F) );
- left |= PC2LOOKUP(0, 1, ((c0 >> 13) & 0x3F) );
- left |= PC2LOOKUP(0, 2, ((c0 >> 4) & 0x38) | (c0 & 0x7) );
- left |= PC2LOOKUP(0, 3, ((c0>>18)&0xC) | ((c0>>11)&0x3) | (c0&0x30));
- right = PC2LOOKUP(1, 0, ((d0 >> 22) & 0x3F) );
- right |= PC2LOOKUP(1, 1, ((d0 >> 15) & 0x30) | ((d0 >> 14) & 0xf) );
- right |= PC2LOOKUP(1, 2, ((d0 >> 7) & 0x3F) );
- right |= PC2LOOKUP(1, 3, ((d0 >> 1) & 0x3C) | (d0 & 0x3));
- */
- void
- make_pc2a( void )
- {
- int i, j;
- for ( i = 0; i < 64; ++i ) {
- j = PC2[i];
- if (j == 0)
- j = -1;
- else if ( j < 29 )
- j = 28 - j ;
- else
- j = 56 - j;
- PC2a[i] = j;
- }
- for ( i = 0; i < 64; i += 8 ) {
- printf("%3d,%3d,%3d,%3d,%3d,%3d,%3d,%3d,n",
- PC2a[i+0],PC2a[i+1],PC2a[i+2],PC2a[i+3],
- PC2a[i+4],PC2a[i+5],PC2a[i+6],PC2a[i+7] );
- }
- }
- HALF PC2cd0[64];
- HALF PC_2H[8][64];
- void
- mktable( )
- {
- int i;
- int table;
- const BYTE * ndx = NDX;
- HALF mask;
- mask = 0x80000000;
- for (i = 0; i < 32; ++i, mask >>= 1) {
- int bit = PC2b[i];
- if (bit < 0)
- continue;
- PC2cd0[bit + 32] = mask;
- }
- mask = 0x80000000;
- for (i = 32; i < 64; ++i, mask >>= 1) {
- int bit = PC2b[i];
- if (bit < 0)
- continue;
- PC2cd0[bit] = mask;
- }
- #if DEBUG
- for (i = 0; i < 64; ++i) {
- printf("0x%08x,n", PC2cd0[i]);
- }
- #endif
- for (i = 0; i < 24; ++i) {
- NDX[i] += 32; /* because c0 is the upper half */
- }
- for (table = 0; table < 8; ++table) {
- HALF bitvals[6];
- for (i = 0; i < 6; ++i) {
- bitvals[5-i] = PC2cd0[*ndx++];
- }
- for (i = 0; i < 64; ++i) {
- int j;
- int k = 0;
- HALF value = 0;
- for (j = i; j; j >>= 1, ++k) {
- if (j & 1) {
- value |= bitvals[k];
- }
- }
- PC_2H[table][i] = value;
- }
- printf("/* table %d */ {n", table );
- for (i = 0; i < 64; i += 4) {
- printf(" 0x%08x, 0x%08x, 0x%08x, 0x%08x, n",
- PC_2H[table][i], PC_2H[table][i+1],
- PC_2H[table][i+2], PC_2H[table][i+3]);
- }
- printf(" },n");
- }
- }
- int
- main(void)
- {
- /* make_pc2a(); */
- mktable();
- return 0;
- }