annotate libtommath/bn_mp_prime_rand.c @ 1861:2b3a8026a6ce

Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
1 #include "tommath_private.h"
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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2 #ifdef BN_MP_PRIME_RAND_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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6 /* makes a truly random prime of a given size (bits),
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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7 *
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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8 * Flags are as follows:
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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9 *
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10 * MP_PRIME_BBS - make prime congruent to 3 mod 4
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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11 * MP_PRIME_SAFE - make sure (p-1)/2 is prime as well (implies MP_PRIME_BBS)
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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12 * MP_PRIME_2MSB_ON - make the 2nd highest bit one
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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13 *
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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14 * You have to supply a callback which fills in a buffer with random bytes. "dat" is a parameter you can
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
15 * have passed to the callback (e.g. a state or something). This function doesn't use "dat" itself
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
16 * so it can be NULL
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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17 *
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18 */
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19
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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20 /* This is possibly the mother of all prime generation functions, muahahahahaha! */
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21 mp_err s_mp_prime_random_ex(mp_int *a, int t, int size, int flags, private_mp_prime_callback cb, void *dat)
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22 {
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23 unsigned char *tmp, maskAND, maskOR_msb, maskOR_lsb;
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24 int bsize, maskOR_msb_offset;
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25 mp_bool res;
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26 mp_err err;
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27
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28 /* sanity check the input */
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29 if ((size <= 1) || (t <= 0)) {
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30 return MP_VAL;
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31 }
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32
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33 /* MP_PRIME_SAFE implies MP_PRIME_BBS */
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34 if ((flags & MP_PRIME_SAFE) != 0) {
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35 flags |= MP_PRIME_BBS;
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36 }
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37
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38 /* calc the byte size */
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39 bsize = (size>>3) + ((size&7)?1:0);
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40
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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41 /* we need a buffer of bsize bytes */
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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42 tmp = (unsigned char *) MP_MALLOC((size_t)bsize);
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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43 if (tmp == NULL) {
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44 return MP_MEM;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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45 }
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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46
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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47 /* calc the maskAND value for the MSbyte*/
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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48 maskAND = ((size&7) == 0) ? 0xFFu : (unsigned char)(0xFFu >> (8 - (size & 7)));
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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49
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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50 /* calc the maskOR_msb */
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51 maskOR_msb = 0;
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52 maskOR_msb_offset = ((size & 7) == 1) ? 1 : 0;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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53 if ((flags & MP_PRIME_2MSB_ON) != 0) {
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54 maskOR_msb |= (unsigned char)(0x80 >> ((9 - size) & 7));
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55 }
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56
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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57 /* get the maskOR_lsb */
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58 maskOR_lsb = 1u;
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59 if ((flags & MP_PRIME_BBS) != 0) {
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60 maskOR_lsb |= 3u;
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61 }
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62
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63 do {
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64 /* read the bytes */
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65 if (cb(tmp, bsize, dat) != bsize) {
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66 err = MP_VAL;
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67 goto error;
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68 }
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69
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70 /* work over the MSbyte */
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71 tmp[0] &= maskAND;
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72 tmp[0] |= (unsigned char)(1 << ((size - 1) & 7));
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diff changeset
73
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74 /* mix in the maskORs */
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75 tmp[maskOR_msb_offset] |= maskOR_msb;
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diff changeset
76 tmp[bsize-1] |= maskOR_lsb;
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77
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78 /* read it in */
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79 /* TODO: casting only for now until all lengths have been changed to the type "size_t"*/
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
80 if ((err = mp_from_ubin(a, tmp, (size_t)bsize)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
81 goto error;
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82 }
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diff changeset
83
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
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84 /* is it prime? */
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parents:
diff changeset
85 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
86 goto error;
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87 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
88 if (res == MP_NO) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
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89 continue;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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90 }
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diff changeset
91
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parents:
diff changeset
92 if ((flags & MP_PRIME_SAFE) != 0) {
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parents:
diff changeset
93 /* see if (a-1)/2 is prime */
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parents:
diff changeset
94 if ((err = mp_sub_d(a, 1uL, a)) != MP_OKAY) {
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parents:
diff changeset
95 goto error;
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96 }
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97 if ((err = mp_div_2(a, a)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
98 goto error;
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99 }
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diff changeset
100
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101 /* is it prime? */
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102 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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103 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
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104 }
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Steffen Jaeckel <s@jaeckel.eu>
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105 }
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Steffen Jaeckel <s@jaeckel.eu>
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106 } while (res == MP_NO);
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parents:
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107
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
108 if ((flags & MP_PRIME_SAFE) != 0) {
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parents:
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109 /* restore a to the original value */
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parents:
diff changeset
110 if ((err = mp_mul_2(a, a)) != MP_OKAY) {
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Steffen Jaeckel <s@jaeckel.eu>
parents:
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111 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
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112 }
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parents:
diff changeset
113 if ((err = mp_add_d(a, 1uL, a)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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114 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
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115 }
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Steffen Jaeckel <s@jaeckel.eu>
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diff changeset
116 }
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117
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118 err = MP_OKAY;
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parents:
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119 error:
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parents:
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120 MP_FREE_BUFFER(tmp, (size_t)bsize);
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121 return err;
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122 }
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parents:
diff changeset
123
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124 static int s_mp_rand_cb(unsigned char *dst, int len, void *dat)
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parents:
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125 {
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parents:
diff changeset
126 (void)dat;
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diff changeset
127 if (len <= 0) {
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parents:
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128 return len;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
129 }
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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130 if (s_mp_rand_source(dst, (size_t)len) != MP_OKAY) {
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131 return 0;
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132 }
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133 return len;
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134 }
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135
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136 mp_err mp_prime_rand(mp_int *a, int t, int size, int flags)
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137 {
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138 return s_mp_prime_random_ex(a, t, size, flags, s_mp_rand_cb, NULL);
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139 }
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140
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141 #endif