Mercurial > dropbear

annotate libtommath/bn_mp_prime_random_ex.c @ 1460:58a74cb829b8

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Pointer parameter could be declared as pointing to const (callback)
author Francois Perrad <francois.perrad@gadz.org>
date Sat, 19 Aug 2017 22:39:53 +0200
parents 60fc6476e044
children 8bba51a55704
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1436
60fc6476e044 Update to libtommath v1.0
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1 #include <tommath_private.h>
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2 #ifdef BN_MP_PRIME_RANDOM_EX_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://libtom.org
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16 */
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17
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18 /* makes a truly random prime of a given size (bits),
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19 *
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20 * Flags are as follows:
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21 *
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22 * LTM_PRIME_BBS - make prime congruent to 3 mod 4
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23 * LTM_PRIME_SAFE - make sure (p-1)/2 is prime as well (implies LTM_PRIME_BBS)
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24 * LTM_PRIME_2MSB_ON - make the 2nd highest bit one
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25 *
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26 * You have to supply a callback which fills in a buffer with random bytes. "dat" is a parameter you can
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27 * have passed to the callback (e.g. a state or something). This function doesn't use "dat" itself
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28 * so it can be NULL
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29 *
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30 */
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31
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32 /* This is possibly the mother of all prime generation functions, muahahahahaha! */
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33 int mp_prime_random_ex(mp_int *a, int t, int size, int flags, ltm_prime_callback cb, void *dat)
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34 {
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35 unsigned char *tmp, maskAND, maskOR_msb, maskOR_lsb;
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36 int res, err, bsize, maskOR_msb_offset;
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37
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38 /* sanity check the input */
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39 if ((size <= 1) || (t <= 0)) {
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40 return MP_VAL;
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41 }
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42
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43 /* LTM_PRIME_SAFE implies LTM_PRIME_BBS */
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44 if ((flags & LTM_PRIME_SAFE) != 0) {
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45 flags |= LTM_PRIME_BBS;
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46 }
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47
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48 /* calc the byte size */
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49 bsize = (size>>3) + ((size&7)?1:0);
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50
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51 /* we need a buffer of bsize bytes */
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52 tmp = OPT_CAST(unsigned char) XMALLOC(bsize);
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53 if (tmp == NULL) {
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54 return MP_MEM;
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55 }
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56
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57 /* calc the maskAND value for the MSbyte*/
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58 maskAND = ((size&7) == 0) ? 0xFF : (0xFF >> (8 - (size & 7)));
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59
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60 /* calc the maskOR_msb */
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61 maskOR_msb = 0;
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62 maskOR_msb_offset = ((size & 7) == 1) ? 1 : 0;
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63 if ((flags & LTM_PRIME_2MSB_ON) != 0) {
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64 maskOR_msb |= 0x80 >> ((9 - size) & 7);
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65 }
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66
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67 /* get the maskOR_lsb */
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68 maskOR_lsb = 1;
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69 if ((flags & LTM_PRIME_BBS) != 0) {
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70 maskOR_lsb |= 3;
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71 }
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72
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73 do {
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74 /* read the bytes */
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75 if (cb(tmp, bsize, dat) != bsize) {
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76 err = MP_VAL;
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77 goto error;
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78 }
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79
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80 /* work over the MSbyte */
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81 tmp[0] &= maskAND;
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82 tmp[0] |= 1 << ((size - 1) & 7);
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83
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84 /* mix in the maskORs */
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85 tmp[maskOR_msb_offset] |= maskOR_msb;
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86 tmp[bsize-1] |= maskOR_lsb;
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87
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88 /* read it in */
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89 if ((err = mp_read_unsigned_bin(a, tmp, bsize)) != MP_OKAY) { goto error; }
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90
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91 /* is it prime? */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) { goto error; }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 if (res == MP_NO) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 continue;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96
1436
60fc6476e044 Update to libtommath v1.0
Matt Johnston <matt@ucc.asn.au>
parents: 389
diff changeset
97 if ((flags & LTM_PRIME_SAFE) != 0) {
284
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 /* see if (a-1)/2 is prime */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 if ((err = mp_sub_d(a, 1, a)) != MP_OKAY) { goto error; }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 if ((err = mp_div_2(a, a)) != MP_OKAY) { goto error; }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 /* is it prime? */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) { goto error; }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 } while (res == MP_NO);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106
1436
60fc6476e044 Update to libtommath v1.0
Matt Johnston <matt@ucc.asn.au>
parents: 389
diff changeset
107 if ((flags & LTM_PRIME_SAFE) != 0) {
284
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 /* restore a to the original value */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109 if ((err = mp_mul_2(a, a)) != MP_OKAY) { goto error; }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110 if ((err = mp_add_d(a, 1, a)) != MP_OKAY) { goto error; }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
111 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
112
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
113 err = MP_OKAY;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
114 error:
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
115 XFREE(tmp);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
116 return err;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
117 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
118
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
119
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
120 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
121
1436
60fc6476e044 Update to libtommath v1.0
Matt Johnston <matt@ucc.asn.au>
parents: 389
diff changeset
122 /* $Source$ */
60fc6476e044 Update to libtommath v1.0
Matt Johnston <matt@ucc.asn.au>
parents: 389
diff changeset
123 /* $Revision$ */
60fc6476e044 Update to libtommath v1.0
Matt Johnston <matt@ucc.asn.au>
parents: 389
diff changeset
124 /* $Date$ */