diff options
Diffstat (limited to 'usr.sbin/xntpd/authstuff/makePC2.c')
| -rw-r--r-- | usr.sbin/xntpd/authstuff/makePC2.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/usr.sbin/xntpd/authstuff/makePC2.c b/usr.sbin/xntpd/authstuff/makePC2.c new file mode 100644 index 0000000..d92d2b2 --- /dev/null +++ b/usr.sbin/xntpd/authstuff/makePC2.c @@ -0,0 +1,238 @@ +/* makePC2.c,v 3.1 1993/07/06 01:05:01 jbj Exp + * makePC2 - build custom permutted choice 2 tables + */ + +#include <stdio.h> +#include <sys/types.h> + +#include "ntp_stdlib.h" + +#define STREQ(a, b) (*(a) == *(b) && strcmp((a), (b)) == 0) + +char *progname; +int debug; + +static void permc P((u_char *, U_LONG *)); +static void permd P((u_char *, U_LONG *)); +static void doit P((void)); + +/* + * main - parse arguments and handle options + */ +void +main(argc, argv) +int argc; +char *argv[]; +{ + int c; + int errflg = 0; + extern int optind; + extern char *optarg; + + progname = argv[0]; + while ((c = getopt_l(argc, argv, "d")) != EOF) + switch (c) { + case 'd': + ++debug; + break; + default: + errflg++; + break; + } + if (errflg) { + (void) fprintf(stderr, "usage: %s [-d]\n", progname); + exit(2); + } + doit(); + exit(0); +} + +/* + * Permuted choice 2 table. This actually produces the low order 24 + * bits of the subkey Ki from the 28 bit value of Ci. This has had + * 1 subtracted from it to give a zero base. + */ +static u_char PC2_C[24] = { + 13, 16, 10, 23, 0, 4, + 2, 27, 14, 5, 20, 9, + 22, 18, 11, 3, 25, 7, + 15, 6, 26, 19, 12, 1 +}; + +/* + * Permuted choice 2 table, operating on the 28 Di bits to produce the + * high order 24 bits of subkey Ki. This has had 29 subtracted from + * it to give it a zero base into our D bit array. + */ +static u_char PC2_D[24] = { + 12, 23, 2, 8, 18, 26, + 1, 11, 22, 16, 4, 19, + 15, 20, 10, 27, 5, 24, + 17, 13, 21, 7, 0, 3 +}; + +U_LONG masks[4] = { 0x40000000, 0x400000, 0x4000, 0x40 }; + + +/* + * permc - permute C, producing a four byte result + */ +static void +permc(bits, resp) + u_char *bits; + U_LONG *resp; +{ + register int part; + register int i; + register U_LONG mask; + u_char res[24]; + + bzero((char *)res, sizeof res); + + for (i = 0; i < 24; i++) { + res[i] = bits[PC2_C[i]]; + } + + *resp = 0; + for (part = 0; part < 4; part++) { + mask = masks[part]; + for (i = part*6; i < (part+1)*6; i++) { + mask >>= 1; + if (res[i]) + *resp |= mask; + } + } +} + +/* + * permd - permute D, producing a four byte result + */ +static void +permd(bits, resp) + u_char *bits; + U_LONG *resp; +{ + register int part; + register int i; + register U_LONG mask; + u_char res[24]; + + bzero((char *)res, sizeof res); + + for (i = 0; i < 24; i++) { + res[i] = bits[PC2_D[i]]; + } + + *resp = 0; + for (part = 0; part < 4; part++) { + mask = masks[part]; + for (i = part*6; i < (part+1)*6; i++) { + mask >>= 1; + if (res[i]) + *resp |= mask; + } + } +} + + +/* + * bits used for each round in C + */ +static int cbits[4][6] = { + 0, 1, 2, 3, 4, 5, + 6, 7, 9, 10, 11, 12, + 13, 14, 15, 16, 22, 23, + 18, 19, 20, 25, 26, 27 +}; + + +/* + * bits used for each round in D + */ +static int dbits[4][6] = { + 0, 1, 2, 3, 4, 5, + 7, 8, 10, 11, 12, 13, + 15, 16, 17, 18, 19, 20, + 21, 22, 23, 24, 26, 27 +}; + + +/* + * doit - compute and print the four PC1 tables + */ +static void +doit() +{ + int i; + int comb; + U_LONG res; + u_char bits[28]; + + bzero((char *)bits, sizeof bits); + + printf("static U_LONG PC2_C[4][64] = {"); + for (i = 0; i < 4; i++) { + for (comb = 0; comb < 64; comb++) { + if (comb & 0x20) + bits[cbits[i][0]] = 1; + if (comb & 0x10) + bits[cbits[i][1]] = 1; + if (comb & 0x8) + bits[cbits[i][2]] = 1; + if (comb & 0x4) + bits[cbits[i][3]] = 1; + if (comb & 0x2) + bits[cbits[i][4]] = 1; + if (comb & 0x1) + bits[cbits[i][5]] = 1; + permc(bits, &res); + bits[cbits[i][0]] = 0; + bits[cbits[i][1]] = 0; + bits[cbits[i][2]] = 0; + bits[cbits[i][3]] = 0; + bits[cbits[i][4]] = 0; + bits[cbits[i][5]] = 0; + if ((comb & 0x3) == 0) + printf("\n\t0x%08x,", res); + else if (comb == 63 && i == 3) + printf(" 0x%08x\n};\n\n", res); + else if (comb == 63) + printf(" 0x%08x,\n", res); + else + printf(" 0x%08x,", res); + } + } + + printf("static U_LONG PC2_D[4][64] = {"); + for (i = 0; i < 4; i++) { + for (comb = 0; comb < 64; comb++) { + if (comb & 0x20) + bits[dbits[i][0]] = 1; + if (comb & 0x10) + bits[dbits[i][1]] = 1; + if (comb & 0x8) + bits[dbits[i][2]] = 1; + if (comb & 0x4) + bits[dbits[i][3]] = 1; + if (comb & 0x2) + bits[dbits[i][4]] = 1; + if (comb & 0x1) + bits[dbits[i][5]] = 1; + permd(bits, &res); + bits[dbits[i][0]] = 0; + bits[dbits[i][1]] = 0; + bits[dbits[i][2]] = 0; + bits[dbits[i][3]] = 0; + bits[dbits[i][4]] = 0; + bits[dbits[i][5]] = 0; + if ((comb & 0x3) == 0) + printf("\n\t0x%08x,", res); + else if (comb == 63 && i == 3) + printf(" 0x%08x\n};\n\n", res); + else if (comb == 63) + printf(" 0x%08x,\n", res); + else + printf(" 0x%08x,", res); + } + } +} |
