diff options
Diffstat (limited to 'libdes/f_sched.c')
| -rw-r--r-- | libdes/f_sched.c | 335 |
1 files changed, 0 insertions, 335 deletions
diff --git a/libdes/f_sched.c b/libdes/f_sched.c deleted file mode 100644 index 82ff800..0000000 --- a/libdes/f_sched.c +++ /dev/null @@ -1,335 +0,0 @@ -/* - * Copyright (c) 1990 Dennis Ferguson. All rights reserved. - * - * Commercial use is permitted only if products which are derived from - * or include this software are made available for purchase and/or use - * in Canada. Otherwise, redistribution and use in source and binary - * forms are permitted. - */ - -/* - * des_make_sched.c - permute a DES key, returning the resulting key schedule - */ -#include "des.h" -#include "f_tables.h" -/* - * Permuted choice 1 tables. These are used to extract bits - * from the left and right parts of the key to form Ci and Di. - * The code that uses these tables knows which bits from which - * part of each key are used to form Ci and Di. - */ -static unsigned long PC1_CL[8] = { - 0x00000000, 0x00000010, 0x00001000, 0x00001010, - 0x00100000, 0x00100010, 0x00101000, 0x00101010 -}; - -static unsigned long PC1_DL[16] = { - 0x00000000, 0x00100000, 0x00001000, 0x00101000, - 0x00000010, 0x00100010, 0x00001010, 0x00101010, - 0x00000001, 0x00100001, 0x00001001, 0x00101001, - 0x00000011, 0x00100011, 0x00001011, 0x00101011 -}; - -static unsigned long PC1_CR[16] = { - 0x00000000, 0x00000001, 0x00000100, 0x00000101, - 0x00010000, 0x00010001, 0x00010100, 0x00010101, - 0x01000000, 0x01000001, 0x01000100, 0x01000101, - 0x01010000, 0x01010001, 0x01010100, 0x01010101 -}; - -static unsigned long PC1_DR[8] = { - 0x00000000, 0x01000000, 0x00010000, 0x01010000, - 0x00000100, 0x01000100, 0x00010100, 0x01010100 -}; - - -/* - * At the start of some iterations of the key schedule we do - * a circular left shift by one place, while for others we do a shift by - * two places. This has bits set for the iterations where we do 2 bit - * shifts, starting at the low order bit. - */ -#define TWO_BIT_SHIFTS 0x7efc - -/* - * Permuted choice 2 tables. The first actually produces the low order - * 24 bits of the subkey Ki from the 28 bit value of Ci. The second produces - * the high order 24 bits from Di. The tables are indexed by six bit - * segments of Ci and Di respectively. The code is handcrafted to compute - * the appropriate 6 bit chunks. - * - * Note that for ease of computation, the 24 bit values are produced with - * six bits going into each byte. Note also that the table has been byte - * rearranged to produce keys which match the order we will apply them - * in in the des code. - */ -static unsigned long PC2_C[4][64] = { - 0x00000000, 0x00000004, 0x00010000, 0x00010004, - 0x00000400, 0x00000404, 0x00010400, 0x00010404, - 0x00000020, 0x00000024, 0x00010020, 0x00010024, - 0x00000420, 0x00000424, 0x00010420, 0x00010424, - 0x01000000, 0x01000004, 0x01010000, 0x01010004, - 0x01000400, 0x01000404, 0x01010400, 0x01010404, - 0x01000020, 0x01000024, 0x01010020, 0x01010024, - 0x01000420, 0x01000424, 0x01010420, 0x01010424, - 0x00020000, 0x00020004, 0x00030000, 0x00030004, - 0x00020400, 0x00020404, 0x00030400, 0x00030404, - 0x00020020, 0x00020024, 0x00030020, 0x00030024, - 0x00020420, 0x00020424, 0x00030420, 0x00030424, - 0x01020000, 0x01020004, 0x01030000, 0x01030004, - 0x01020400, 0x01020404, 0x01030400, 0x01030404, - 0x01020020, 0x01020024, 0x01030020, 0x01030024, - 0x01020420, 0x01020424, 0x01030420, 0x01030424, - - 0x00000000, 0x02000000, 0x00000800, 0x02000800, - 0x00080000, 0x02080000, 0x00080800, 0x02080800, - 0x00000001, 0x02000001, 0x00000801, 0x02000801, - 0x00080001, 0x02080001, 0x00080801, 0x02080801, - 0x00000100, 0x02000100, 0x00000900, 0x02000900, - 0x00080100, 0x02080100, 0x00080900, 0x02080900, - 0x00000101, 0x02000101, 0x00000901, 0x02000901, - 0x00080101, 0x02080101, 0x00080901, 0x02080901, - 0x10000000, 0x12000000, 0x10000800, 0x12000800, - 0x10080000, 0x12080000, 0x10080800, 0x12080800, - 0x10000001, 0x12000001, 0x10000801, 0x12000801, - 0x10080001, 0x12080001, 0x10080801, 0x12080801, - 0x10000100, 0x12000100, 0x10000900, 0x12000900, - 0x10080100, 0x12080100, 0x10080900, 0x12080900, - 0x10000101, 0x12000101, 0x10000901, 0x12000901, - 0x10080101, 0x12080101, 0x10080901, 0x12080901, - - 0x00000000, 0x00040000, 0x00002000, 0x00042000, - 0x00100000, 0x00140000, 0x00102000, 0x00142000, - 0x20000000, 0x20040000, 0x20002000, 0x20042000, - 0x20100000, 0x20140000, 0x20102000, 0x20142000, - 0x00000008, 0x00040008, 0x00002008, 0x00042008, - 0x00100008, 0x00140008, 0x00102008, 0x00142008, - 0x20000008, 0x20040008, 0x20002008, 0x20042008, - 0x20100008, 0x20140008, 0x20102008, 0x20142008, - 0x00200000, 0x00240000, 0x00202000, 0x00242000, - 0x00300000, 0x00340000, 0x00302000, 0x00342000, - 0x20200000, 0x20240000, 0x20202000, 0x20242000, - 0x20300000, 0x20340000, 0x20302000, 0x20342000, - 0x00200008, 0x00240008, 0x00202008, 0x00242008, - 0x00300008, 0x00340008, 0x00302008, 0x00342008, - 0x20200008, 0x20240008, 0x20202008, 0x20242008, - 0x20300008, 0x20340008, 0x20302008, 0x20342008, - - 0x00000000, 0x00000010, 0x08000000, 0x08000010, - 0x00000200, 0x00000210, 0x08000200, 0x08000210, - 0x00000002, 0x00000012, 0x08000002, 0x08000012, - 0x00000202, 0x00000212, 0x08000202, 0x08000212, - 0x04000000, 0x04000010, 0x0c000000, 0x0c000010, - 0x04000200, 0x04000210, 0x0c000200, 0x0c000210, - 0x04000002, 0x04000012, 0x0c000002, 0x0c000012, - 0x04000202, 0x04000212, 0x0c000202, 0x0c000212, - 0x00001000, 0x00001010, 0x08001000, 0x08001010, - 0x00001200, 0x00001210, 0x08001200, 0x08001210, - 0x00001002, 0x00001012, 0x08001002, 0x08001012, - 0x00001202, 0x00001212, 0x08001202, 0x08001212, - 0x04001000, 0x04001010, 0x0c001000, 0x0c001010, - 0x04001200, 0x04001210, 0x0c001200, 0x0c001210, - 0x04001002, 0x04001012, 0x0c001002, 0x0c001012, - 0x04001202, 0x04001212, 0x0c001202, 0x0c001212 -}; - -static unsigned long PC2_D[4][64] = { - 0x00000000, 0x02000000, 0x00020000, 0x02020000, - 0x00000100, 0x02000100, 0x00020100, 0x02020100, - 0x00000008, 0x02000008, 0x00020008, 0x02020008, - 0x00000108, 0x02000108, 0x00020108, 0x02020108, - 0x00200000, 0x02200000, 0x00220000, 0x02220000, - 0x00200100, 0x02200100, 0x00220100, 0x02220100, - 0x00200008, 0x02200008, 0x00220008, 0x02220008, - 0x00200108, 0x02200108, 0x00220108, 0x02220108, - 0x00000200, 0x02000200, 0x00020200, 0x02020200, - 0x00000300, 0x02000300, 0x00020300, 0x02020300, - 0x00000208, 0x02000208, 0x00020208, 0x02020208, - 0x00000308, 0x02000308, 0x00020308, 0x02020308, - 0x00200200, 0x02200200, 0x00220200, 0x02220200, - 0x00200300, 0x02200300, 0x00220300, 0x02220300, - 0x00200208, 0x02200208, 0x00220208, 0x02220208, - 0x00200308, 0x02200308, 0x00220308, 0x02220308, - - 0x00000000, 0x00001000, 0x00000020, 0x00001020, - 0x00100000, 0x00101000, 0x00100020, 0x00101020, - 0x08000000, 0x08001000, 0x08000020, 0x08001020, - 0x08100000, 0x08101000, 0x08100020, 0x08101020, - 0x00000004, 0x00001004, 0x00000024, 0x00001024, - 0x00100004, 0x00101004, 0x00100024, 0x00101024, - 0x08000004, 0x08001004, 0x08000024, 0x08001024, - 0x08100004, 0x08101004, 0x08100024, 0x08101024, - 0x00000400, 0x00001400, 0x00000420, 0x00001420, - 0x00100400, 0x00101400, 0x00100420, 0x00101420, - 0x08000400, 0x08001400, 0x08000420, 0x08001420, - 0x08100400, 0x08101400, 0x08100420, 0x08101420, - 0x00000404, 0x00001404, 0x00000424, 0x00001424, - 0x00100404, 0x00101404, 0x00100424, 0x00101424, - 0x08000404, 0x08001404, 0x08000424, 0x08001424, - 0x08100404, 0x08101404, 0x08100424, 0x08101424, - - 0x00000000, 0x10000000, 0x00010000, 0x10010000, - 0x00000002, 0x10000002, 0x00010002, 0x10010002, - 0x00002000, 0x10002000, 0x00012000, 0x10012000, - 0x00002002, 0x10002002, 0x00012002, 0x10012002, - 0x00040000, 0x10040000, 0x00050000, 0x10050000, - 0x00040002, 0x10040002, 0x00050002, 0x10050002, - 0x00042000, 0x10042000, 0x00052000, 0x10052000, - 0x00042002, 0x10042002, 0x00052002, 0x10052002, - 0x20000000, 0x30000000, 0x20010000, 0x30010000, - 0x20000002, 0x30000002, 0x20010002, 0x30010002, - 0x20002000, 0x30002000, 0x20012000, 0x30012000, - 0x20002002, 0x30002002, 0x20012002, 0x30012002, - 0x20040000, 0x30040000, 0x20050000, 0x30050000, - 0x20040002, 0x30040002, 0x20050002, 0x30050002, - 0x20042000, 0x30042000, 0x20052000, 0x30052000, - 0x20042002, 0x30042002, 0x20052002, 0x30052002, - - 0x00000000, 0x04000000, 0x00000001, 0x04000001, - 0x01000000, 0x05000000, 0x01000001, 0x05000001, - 0x00000010, 0x04000010, 0x00000011, 0x04000011, - 0x01000010, 0x05000010, 0x01000011, 0x05000011, - 0x00080000, 0x04080000, 0x00080001, 0x04080001, - 0x01080000, 0x05080000, 0x01080001, 0x05080001, - 0x00080010, 0x04080010, 0x00080011, 0x04080011, - 0x01080010, 0x05080010, 0x01080011, 0x05080011, - 0x00000800, 0x04000800, 0x00000801, 0x04000801, - 0x01000800, 0x05000800, 0x01000801, 0x05000801, - 0x00000810, 0x04000810, 0x00000811, 0x04000811, - 0x01000810, 0x05000810, 0x01000811, 0x05000811, - 0x00080800, 0x04080800, 0x00080801, 0x04080801, - 0x01080800, 0x05080800, 0x01080801, 0x05080801, - 0x00080810, 0x04080810, 0x00080811, 0x04080811, - 0x01080810, 0x05080810, 0x01080811, 0x05080811 -}; - - - -/* - * Permute the key to give us our key schedule. - */ -int -make_key_sched(key, schedule) - des_cblock *key; - des_key_schedule schedule; -{ - register unsigned long c, d; - - { - /* - * Need a pointer for the keys and a temporary long - */ - register unsigned char *k; - register unsigned long tmp; - - /* - * Fetch the key into something we can work with - */ - k = (unsigned char *)key; - - /* - * The first permutted choice gives us the 28 bits for C0 and - * 28 for D0. C0 gets 12 bits from the left key and 16 from - * the right, while D0 gets 16 from the left and 12 from the - * right. The code knows which bits go where. - */ - tmp = ((u_int32)(*(k)++)) << 24; - tmp |= ((u_int32)(*(k)++)) << 16; - tmp |= ((u_int32)(*(k)++)) << 8; - tmp |= (u_int32)(*(k)++); /* left part of key */ - c = PC1_CL[(tmp >> 29) & 0x7] - | (PC1_CL[(tmp >> 21) & 0x7] << 1) - | (PC1_CL[(tmp >> 13) & 0x7] << 2) - | (PC1_CL[(tmp >> 5) & 0x7] << 3); - d = PC1_DL[(tmp >> 25) & 0xf] - | (PC1_DL[(tmp >> 17) & 0xf] << 1) - | (PC1_DL[(tmp >> 9) & 0xf] << 2) - | (PC1_DL[(tmp >> 1) & 0xf] << 3); - - tmp = ((u_int32)(*(k)++)) << 24; - tmp |= ((u_int32)(*(k)++)) << 16; - tmp |= ((u_int32)(*(k)++)) << 8; - tmp |= (u_int32)(*(k)++); /* right part of key */ - c |= PC1_CR[(tmp >> 28) & 0xf] - | (PC1_CR[(tmp >> 20) & 0xf] << 1) - | (PC1_CR[(tmp >> 12) & 0xf] << 2) - | (PC1_CR[(tmp >> 4) & 0xf] << 3); - d |= PC1_DR[(tmp >> 25) & 0x7] - | (PC1_DR[(tmp >> 17) & 0x7] << 1) - | (PC1_DR[(tmp >> 9) & 0x7] << 2) - | (PC1_DR[(tmp >> 1) & 0x7] << 3); - } - - { - /* - * Need several temporaries in here - */ - register unsigned long ltmp, rtmp; - register u_int32 *k; - register int two_bit_shifts; - register int i; - /* - * Now iterate to compute the key schedule. Note that we - * record the entire set of subkeys in 6 bit chunks since - * they are used that way. At 6 bits/char, we need - * 48/6 char's/subkey * 16 subkeys/encryption == 128 bytes. - * The schedule must be this big. - */ - k = (u_int32 *)schedule; - two_bit_shifts = TWO_BIT_SHIFTS; - for (i = 16; i > 0; i--) { - /* - * Do the rotation. One bit and two bit rotations - * are done separately. Note C and D are 28 bits. - */ - if (two_bit_shifts & 0x1) { - c = ((c << 2) & 0xffffffc) | (c >> 26); - d = ((d << 2) & 0xffffffc) | (d >> 26); - } else { - c = ((c << 1) & 0xffffffe) | (c >> 27); - d = ((d << 1) & 0xffffffe) | (d >> 27); - } - two_bit_shifts >>= 1; - - /* - * Apply permutted choice 2 to C to get the first - * 24 bits worth of keys. Note that bits 9, 18, 22 - * and 25 (using DES numbering) in C are unused. The - * shift-mask stuff is done to delete these bits from - * the indices, since this cuts the table size in half. - * - * The table is torqued, by the way. If the standard - * byte order for this (high to low order) is 1234, - * the table actually gives us 4132. - */ - ltmp = PC2_C[0][((c >> 22) & 0x3f)] - | PC2_C[1][((c >> 15) & 0xf) | ((c >> 16) & 0x30)] - | PC2_C[2][((c >> 4) & 0x3) | ((c >> 9) & 0x3c)] - | PC2_C[3][((c ) & 0x7) | ((c >> 4) & 0x38)]; - /* - * Apply permutted choice 2 to D to get the other half. - * Here, bits 7, 10, 15 and 26 go unused. The sqeezing - * actually turns out to be cheaper here. - * - * This table is similarly torqued. If the standard - * byte order is 5678, the table has the bytes permuted - * to give us 7685. - */ - rtmp = PC2_D[0][((d >> 22) & 0x3f)] - | PC2_D[1][((d >> 14) & 0xf) | ((d >> 15) & 0x30)] - | PC2_D[2][((d >> 7) & 0x3f)] - | PC2_D[3][((d ) & 0x3) | ((d >> 1) & 0x3c)]; - - /* - * Make up two words of the key schedule, with a - * byte order which is convenient for the DES - * inner loop. The high order (first) word will - * hold bytes 7135 (high to low order) while the - * second holds bytes 4682. - */ - *k++ = (ltmp & 0x00ffff00) | (rtmp & 0xff0000ff); - *k++ = (ltmp & 0xff0000ff) | (rtmp & 0x00ffff00); - } - } - return (0); -} |