The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/opencrypto/skipjack.c

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    1 /*      $OpenBSD: skipjack.c,v 1.3 2001/05/05 00:31:34 angelos Exp $    */
    2 /* 
    3  * Further optimized test implementation of SKIPJACK algorithm 
    4  * Mark Tillotson <markt@chaos.org.uk>, 25 June 98

    5  * Optimizations suit RISC (lots of registers) machine best.
    6  *
    7  * based on unoptimized implementation of
    8  * Panu Rissanen <bande@lut.fi> 960624
    9  *
   10  * SKIPJACK and KEA Algorithm Specifications 
   11  * Version 2.0 
   12  * 29 May 1998
   13 */
   14 
   15 #include <sys/cdefs.h>
   16 __FBSDID("$FreeBSD: src/sys/opencrypto/skipjack.c,v 1.2 2003/06/11 05:57:50 obrien Exp $");
   17 
   18 #include <sys/param.h>
   19 
   20 #include <opencrypto/skipjack.h>
   21 
   22 static const u_int8_t ftable[0x100] =
   23 { 
   24         0xa3, 0xd7, 0x09, 0x83, 0xf8, 0x48, 0xf6, 0xf4, 
   25         0xb3, 0x21, 0x15, 0x78, 0x99, 0xb1, 0xaf, 0xf9, 
   26         0xe7, 0x2d, 0x4d, 0x8a, 0xce, 0x4c, 0xca, 0x2e, 
   27         0x52, 0x95, 0xd9, 0x1e, 0x4e, 0x38, 0x44, 0x28, 
   28         0x0a, 0xdf, 0x02, 0xa0, 0x17, 0xf1, 0x60, 0x68, 
   29         0x12, 0xb7, 0x7a, 0xc3, 0xe9, 0xfa, 0x3d, 0x53, 
   30         0x96, 0x84, 0x6b, 0xba, 0xf2, 0x63, 0x9a, 0x19, 
   31         0x7c, 0xae, 0xe5, 0xf5, 0xf7, 0x16, 0x6a, 0xa2, 
   32         0x39, 0xb6, 0x7b, 0x0f, 0xc1, 0x93, 0x81, 0x1b, 
   33         0xee, 0xb4, 0x1a, 0xea, 0xd0, 0x91, 0x2f, 0xb8, 
   34         0x55, 0xb9, 0xda, 0x85, 0x3f, 0x41, 0xbf, 0xe0, 
   35         0x5a, 0x58, 0x80, 0x5f, 0x66, 0x0b, 0xd8, 0x90, 
   36         0x35, 0xd5, 0xc0, 0xa7, 0x33, 0x06, 0x65, 0x69, 
   37         0x45, 0x00, 0x94, 0x56, 0x6d, 0x98, 0x9b, 0x76, 
   38         0x97, 0xfc, 0xb2, 0xc2, 0xb0, 0xfe, 0xdb, 0x20, 
   39         0xe1, 0xeb, 0xd6, 0xe4, 0xdd, 0x47, 0x4a, 0x1d, 
   40         0x42, 0xed, 0x9e, 0x6e, 0x49, 0x3c, 0xcd, 0x43, 
   41         0x27, 0xd2, 0x07, 0xd4, 0xde, 0xc7, 0x67, 0x18, 
   42         0x89, 0xcb, 0x30, 0x1f, 0x8d, 0xc6, 0x8f, 0xaa, 
   43         0xc8, 0x74, 0xdc, 0xc9, 0x5d, 0x5c, 0x31, 0xa4, 
   44         0x70, 0x88, 0x61, 0x2c, 0x9f, 0x0d, 0x2b, 0x87, 
   45         0x50, 0x82, 0x54, 0x64, 0x26, 0x7d, 0x03, 0x40, 
   46         0x34, 0x4b, 0x1c, 0x73, 0xd1, 0xc4, 0xfd, 0x3b, 
   47         0xcc, 0xfb, 0x7f, 0xab, 0xe6, 0x3e, 0x5b, 0xa5, 
   48         0xad, 0x04, 0x23, 0x9c, 0x14, 0x51, 0x22, 0xf0, 
   49         0x29, 0x79, 0x71, 0x7e, 0xff, 0x8c, 0x0e, 0xe2, 
   50         0x0c, 0xef, 0xbc, 0x72, 0x75, 0x6f, 0x37, 0xa1, 
   51         0xec, 0xd3, 0x8e, 0x62, 0x8b, 0x86, 0x10, 0xe8, 
   52         0x08, 0x77, 0x11, 0xbe, 0x92, 0x4f, 0x24, 0xc5, 
   53         0x32, 0x36, 0x9d, 0xcf, 0xf3, 0xa6, 0xbb, 0xac, 
   54         0x5e, 0x6c, 0xa9, 0x13, 0x57, 0x25, 0xb5, 0xe3, 
   55         0xbd, 0xa8, 0x3a, 0x01, 0x05, 0x59, 0x2a, 0x46
   56 };
   57 
   58 /*
   59  * For each key byte generate a table to represent the function 
   60  *    ftable [in ^ keybyte]
   61  *
   62  * These tables used to save an XOR in each stage of the G-function
   63  * the tables are hopefully pointed to by register allocated variables
   64  * k0, k1..k9
   65  */
   66 
   67 void
   68 subkey_table_gen (u_int8_t *key, u_int8_t **key_tables)
   69 {
   70         int i, k;
   71 
   72         for (k = 0; k < 10; k++) {
   73                 u_int8_t   key_byte = key [k];
   74                 u_int8_t * table = key_tables[k];
   75                 for (i = 0; i < 0x100; i++)
   76                         table [i] = ftable [i ^ key_byte];
   77         }
   78 }
   79 
   80 
   81 #define g(k0, k1, k2, k3, ih, il, oh, ol) \
   82 { \
   83         oh = k##k0 [il] ^ ih; \
   84         ol = k##k1 [oh] ^ il; \
   85         oh = k##k2 [ol] ^ oh; \
   86         ol = k##k3 [oh] ^ ol; \
   87 }
   88 
   89 #define g0(ih, il, oh, ol) g(0, 1, 2, 3, ih, il, oh, ol)
   90 #define g4(ih, il, oh, ol) g(4, 5, 6, 7, ih, il, oh, ol)
   91 #define g8(ih, il, oh, ol) g(8, 9, 0, 1, ih, il, oh, ol)
   92 #define g2(ih, il, oh, ol) g(2, 3, 4, 5, ih, il, oh, ol)
   93 #define g6(ih, il, oh, ol) g(6, 7, 8, 9, ih, il, oh, ol)
   94 
   95  
   96 #define g_inv(k0, k1, k2, k3, ih, il, oh, ol) \
   97 { \
   98         ol = k##k3 [ih] ^ il; \
   99         oh = k##k2 [ol] ^ ih; \
  100         ol = k##k1 [oh] ^ ol; \
  101         oh = k##k0 [ol] ^ oh; \
  102 }
  103 
  104 
  105 #define g0_inv(ih, il, oh, ol) g_inv(0, 1, 2, 3, ih, il, oh, ol)
  106 #define g4_inv(ih, il, oh, ol) g_inv(4, 5, 6, 7, ih, il, oh, ol)
  107 #define g8_inv(ih, il, oh, ol) g_inv(8, 9, 0, 1, ih, il, oh, ol)
  108 #define g2_inv(ih, il, oh, ol) g_inv(2, 3, 4, 5, ih, il, oh, ol)
  109 #define g6_inv(ih, il, oh, ol) g_inv(6, 7, 8, 9, ih, il, oh, ol)
  110 
  111 /* optimized version of Skipjack algorithm
  112  *
  113  * the appropriate g-function is inlined for each round
  114  *
  115  * the data movement is minimized by rotating the names of the 
  116  * variables w1..w4, not their contents (saves 3 moves per round)
  117  *
  118  * the loops are completely unrolled (needed to staticize choice of g)
  119  *
  120  * compiles to about 470 instructions on a Sparc (gcc -O)
  121  * which is about 58 instructions per byte, 14 per round.
  122  * gcc seems to leave in some unnecessary and with 0xFF operations
  123  * but only in the latter part of the functions.  Perhaps it
  124  * runs out of resources to properly optimize long inlined function?
  125  * in theory should get about 11 instructions per round, not 14
  126  */
  127 
  128 void
  129 skipjack_forwards(u_int8_t *plain, u_int8_t *cipher, u_int8_t **key_tables)
  130 {
  131         u_int8_t wh1 = plain[0];  u_int8_t wl1 = plain[1];
  132         u_int8_t wh2 = plain[2];  u_int8_t wl2 = plain[3];
  133         u_int8_t wh3 = plain[4];  u_int8_t wl3 = plain[5];
  134         u_int8_t wh4 = plain[6];  u_int8_t wl4 = plain[7];
  135 
  136         u_int8_t * k0 = key_tables [0];
  137         u_int8_t * k1 = key_tables [1];
  138         u_int8_t * k2 = key_tables [2];
  139         u_int8_t * k3 = key_tables [3];
  140         u_int8_t * k4 = key_tables [4];
  141         u_int8_t * k5 = key_tables [5];
  142         u_int8_t * k6 = key_tables [6];
  143         u_int8_t * k7 = key_tables [7];
  144         u_int8_t * k8 = key_tables [8];
  145         u_int8_t * k9 = key_tables [9];
  146 
  147         /* first 8 rounds */
  148         g0 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 1; wh4 ^= wh1;
  149         g4 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 2; wh3 ^= wh4;
  150         g8 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 3; wh2 ^= wh3;
  151         g2 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 4; wh1 ^= wh2;
  152         g6 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 5; wh4 ^= wh1;
  153         g0 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 6; wh3 ^= wh4;
  154         g4 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 7; wh2 ^= wh3;
  155         g8 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 8; wh1 ^= wh2;
  156 
  157         /* second 8 rounds */
  158         wh2 ^= wh1; wl2 ^= wl1 ^ 9 ; g2 (wh1,wl1, wh1,wl1);
  159         wh1 ^= wh4; wl1 ^= wl4 ^ 10; g6 (wh4,wl4, wh4,wl4);
  160         wh4 ^= wh3; wl4 ^= wl3 ^ 11; g0 (wh3,wl3, wh3,wl3);
  161         wh3 ^= wh2; wl3 ^= wl2 ^ 12; g4 (wh2,wl2, wh2,wl2);
  162         wh2 ^= wh1; wl2 ^= wl1 ^ 13; g8 (wh1,wl1, wh1,wl1);
  163         wh1 ^= wh4; wl1 ^= wl4 ^ 14; g2 (wh4,wl4, wh4,wl4);
  164         wh4 ^= wh3; wl4 ^= wl3 ^ 15; g6 (wh3,wl3, wh3,wl3);
  165         wh3 ^= wh2; wl3 ^= wl2 ^ 16; g0 (wh2,wl2, wh2,wl2);
  166 
  167         /* third 8 rounds */
  168         g4 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 17; wh4 ^= wh1;
  169         g8 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 18; wh3 ^= wh4;
  170         g2 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 19; wh2 ^= wh3;
  171         g6 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 20; wh1 ^= wh2;
  172         g0 (wh1,wl1, wh1,wl1); wl4 ^= wl1 ^ 21; wh4 ^= wh1;
  173         g4 (wh4,wl4, wh4,wl4); wl3 ^= wl4 ^ 22; wh3 ^= wh4;
  174         g8 (wh3,wl3, wh3,wl3); wl2 ^= wl3 ^ 23; wh2 ^= wh3;
  175         g2 (wh2,wl2, wh2,wl2); wl1 ^= wl2 ^ 24; wh1 ^= wh2;
  176 
  177         /* last 8 rounds */
  178         wh2 ^= wh1; wl2 ^= wl1 ^ 25; g6 (wh1,wl1, wh1,wl1);
  179         wh1 ^= wh4; wl1 ^= wl4 ^ 26; g0 (wh4,wl4, wh4,wl4);
  180         wh4 ^= wh3; wl4 ^= wl3 ^ 27; g4 (wh3,wl3, wh3,wl3);
  181         wh3 ^= wh2; wl3 ^= wl2 ^ 28; g8 (wh2,wl2, wh2,wl2);
  182         wh2 ^= wh1; wl2 ^= wl1 ^ 29; g2 (wh1,wl1, wh1,wl1);
  183         wh1 ^= wh4; wl1 ^= wl4 ^ 30; g6 (wh4,wl4, wh4,wl4);
  184         wh4 ^= wh3; wl4 ^= wl3 ^ 31; g0 (wh3,wl3, wh3,wl3);
  185         wh3 ^= wh2; wl3 ^= wl2 ^ 32; g4 (wh2,wl2, wh2,wl2);
  186 
  187         /* pack into byte vector */
  188         cipher [0] = wh1;  cipher [1] = wl1;
  189         cipher [2] = wh2;  cipher [3] = wl2;
  190         cipher [4] = wh3;  cipher [5] = wl3;
  191         cipher [6] = wh4;  cipher [7] = wl4;
  192 }
  193 
  194 
  195 void
  196 skipjack_backwards (u_int8_t *cipher, u_int8_t *plain, u_int8_t **key_tables)
  197 {
  198         /* setup 4 16-bit portions */
  199         u_int8_t wh1 = cipher[0];  u_int8_t wl1 = cipher[1];
  200         u_int8_t wh2 = cipher[2];  u_int8_t wl2 = cipher[3];
  201         u_int8_t wh3 = cipher[4];  u_int8_t wl3 = cipher[5];
  202         u_int8_t wh4 = cipher[6];  u_int8_t wl4 = cipher[7];
  203 
  204         u_int8_t * k0 = key_tables [0];
  205         u_int8_t * k1 = key_tables [1];
  206         u_int8_t * k2 = key_tables [2];
  207         u_int8_t * k3 = key_tables [3];
  208         u_int8_t * k4 = key_tables [4];
  209         u_int8_t * k5 = key_tables [5];
  210         u_int8_t * k6 = key_tables [6];
  211         u_int8_t * k7 = key_tables [7];
  212         u_int8_t * k8 = key_tables [8];
  213         u_int8_t * k9 = key_tables [9];
  214 
  215         /* first 8 rounds */
  216         g4_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 32; wh3 ^= wh2;
  217         g0_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 31; wh4 ^= wh3;
  218         g6_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 30; wh1 ^= wh4;
  219         g2_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 29; wh2 ^= wh1;
  220         g8_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 28; wh3 ^= wh2;
  221         g4_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 27; wh4 ^= wh3;
  222         g0_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 26; wh1 ^= wh4;
  223         g6_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 25; wh2 ^= wh1;
  224 
  225         /* second 8 rounds */
  226         wh1 ^= wh2; wl1 ^= wl2 ^ 24; g2_inv (wh2,wl2, wh2,wl2);
  227         wh2 ^= wh3; wl2 ^= wl3 ^ 23; g8_inv (wh3,wl3, wh3,wl3);
  228         wh3 ^= wh4; wl3 ^= wl4 ^ 22; g4_inv (wh4,wl4, wh4,wl4);
  229         wh4 ^= wh1; wl4 ^= wl1 ^ 21; g0_inv (wh1,wl1, wh1,wl1);
  230         wh1 ^= wh2; wl1 ^= wl2 ^ 20; g6_inv (wh2,wl2, wh2,wl2);
  231         wh2 ^= wh3; wl2 ^= wl3 ^ 19; g2_inv (wh3,wl3, wh3,wl3);
  232         wh3 ^= wh4; wl3 ^= wl4 ^ 18; g8_inv (wh4,wl4, wh4,wl4);
  233         wh4 ^= wh1; wl4 ^= wl1 ^ 17; g4_inv (wh1,wl1, wh1,wl1);
  234 
  235         /* third 8 rounds */
  236         g0_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 16; wh3 ^= wh2;
  237         g6_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 15; wh4 ^= wh3;
  238         g2_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 14; wh1 ^= wh4;
  239         g8_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 13; wh2 ^= wh1;
  240         g4_inv (wh2,wl2, wh2,wl2); wl3 ^= wl2 ^ 12; wh3 ^= wh2;
  241         g0_inv (wh3,wl3, wh3,wl3); wl4 ^= wl3 ^ 11; wh4 ^= wh3;
  242         g6_inv (wh4,wl4, wh4,wl4); wl1 ^= wl4 ^ 10; wh1 ^= wh4;
  243         g2_inv (wh1,wl1, wh1,wl1); wl2 ^= wl1 ^ 9;  wh2 ^= wh1;
  244 
  245         /* last 8 rounds */
  246         wh1 ^= wh2; wl1 ^= wl2 ^ 8; g8_inv (wh2,wl2, wh2,wl2);
  247         wh2 ^= wh3; wl2 ^= wl3 ^ 7; g4_inv (wh3,wl3, wh3,wl3);
  248         wh3 ^= wh4; wl3 ^= wl4 ^ 6; g0_inv (wh4,wl4, wh4,wl4);
  249         wh4 ^= wh1; wl4 ^= wl1 ^ 5; g6_inv (wh1,wl1, wh1,wl1);
  250         wh1 ^= wh2; wl1 ^= wl2 ^ 4; g2_inv (wh2,wl2, wh2,wl2);
  251         wh2 ^= wh3; wl2 ^= wl3 ^ 3; g8_inv (wh3,wl3, wh3,wl3);
  252         wh3 ^= wh4; wl3 ^= wl4 ^ 2; g4_inv (wh4,wl4, wh4,wl4);
  253         wh4 ^= wh1; wl4 ^= wl1 ^ 1; g0_inv (wh1,wl1, wh1,wl1);
  254 
  255         /* pack into byte vector */
  256         plain [0] = wh1;  plain [1] = wl1;
  257         plain [2] = wh2;  plain [3] = wl2;
  258         plain [4] = wh3;  plain [5] = wl3;
  259         plain [6] = wh4;  plain [7] = wl4;
  260 }

Cache object: e06f1b59b5db1315c42014ffd8bdfefb


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