Mercurial > dropbear
annotate libtommath/bn_s_mp_exptmod.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> |
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date | Sun, 30 Jan 2022 10:14:56 +0800 |
parents | 1051e4eea25a |
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rev | line source |
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1 #include "tommath_private.h" |
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2 #ifdef BN_S_MP_EXPTMOD_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 |
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6 #ifdef MP_LOW_MEM |
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7 # define TAB_SIZE 32 |
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8 # define MAX_WINSIZE 5 |
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9 #else |
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10 # define TAB_SIZE 256 |
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11 # define MAX_WINSIZE 0 |
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12 #endif |
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13 |
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14 mp_err s_mp_exptmod(const mp_int *G, const mp_int *X, const mp_int *P, mp_int *Y, int redmode) |
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15 { |
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16 mp_int M[TAB_SIZE], res, mu; |
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17 mp_digit buf; |
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18 mp_err err; |
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19 int bitbuf, bitcpy, bitcnt, mode, digidx, x, y, winsize; |
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20 mp_err(*redux)(mp_int *x, const mp_int *m, const mp_int *mu); |
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21 |
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22 /* find window size */ |
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23 x = mp_count_bits(X); |
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24 if (x <= 7) { |
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25 winsize = 2; |
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26 } else if (x <= 36) { |
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27 winsize = 3; |
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28 } else if (x <= 140) { |
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29 winsize = 4; |
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30 } else if (x <= 450) { |
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31 winsize = 5; |
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32 } else if (x <= 1303) { |
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33 winsize = 6; |
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34 } else if (x <= 3529) { |
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35 winsize = 7; |
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36 } else { |
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37 winsize = 8; |
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38 } |
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39 |
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40 winsize = MAX_WINSIZE ? MP_MIN(MAX_WINSIZE, winsize) : winsize; |
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41 |
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42 /* init M array */ |
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43 /* init first cell */ |
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44 if ((err = mp_init(&M[1])) != MP_OKAY) { |
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45 return err; |
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46 } |
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47 |
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48 /* now init the second half of the array */ |
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49 for (x = 1<<(winsize-1); x < (1 << winsize); x++) { |
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50 if ((err = mp_init(&M[x])) != MP_OKAY) { |
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51 for (y = 1<<(winsize-1); y < x; y++) { |
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52 mp_clear(&M[y]); |
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53 } |
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54 mp_clear(&M[1]); |
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55 return err; |
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56 } |
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57 } |
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58 |
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59 /* create mu, used for Barrett reduction */ |
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60 if ((err = mp_init(&mu)) != MP_OKAY) goto LBL_M; |
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61 |
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62 if (redmode == 0) { |
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63 if ((err = mp_reduce_setup(&mu, P)) != MP_OKAY) goto LBL_MU; |
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64 redux = mp_reduce; |
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65 } else { |
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66 if ((err = mp_reduce_2k_setup_l(P, &mu)) != MP_OKAY) goto LBL_MU; |
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67 redux = mp_reduce_2k_l; |
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68 } |
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69 |
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70 /* create M table |
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71 * |
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72 * The M table contains powers of the base, |
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73 * e.g. M[x] = G**x mod P |
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74 * |
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75 * The first half of the table is not |
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76 * computed though accept for M[0] and M[1] |
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77 */ |
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78 if ((err = mp_mod(G, P, &M[1])) != MP_OKAY) goto LBL_MU; |
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79 |
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80 /* compute the value at M[1<<(winsize-1)] by squaring |
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81 * M[1] (winsize-1) times |
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82 */ |
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83 if ((err = mp_copy(&M[1], &M[(size_t)1 << (winsize - 1)])) != MP_OKAY) goto LBL_MU; |
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84 |
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85 for (x = 0; x < (winsize - 1); x++) { |
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86 /* square it */ |
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87 if ((err = mp_sqr(&M[(size_t)1 << (winsize - 1)], |
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88 &M[(size_t)1 << (winsize - 1)])) != MP_OKAY) goto LBL_MU; |
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89 |
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90 /* reduce modulo P */ |
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91 if ((err = redux(&M[(size_t)1 << (winsize - 1)], P, &mu)) != MP_OKAY) goto LBL_MU; |
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92 } |
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93 |
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94 /* create upper table, that is M[x] = M[x-1] * M[1] (mod P) |
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95 * for x = (2**(winsize - 1) + 1) to (2**winsize - 1) |
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96 */ |
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97 for (x = (1 << (winsize - 1)) + 1; x < (1 << winsize); x++) { |
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98 if ((err = mp_mul(&M[x - 1], &M[1], &M[x])) != MP_OKAY) goto LBL_MU; |
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99 if ((err = redux(&M[x], P, &mu)) != MP_OKAY) goto LBL_MU; |
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100 } |
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101 |
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102 /* setup result */ |
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103 if ((err = mp_init(&res)) != MP_OKAY) goto LBL_MU; |
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104 mp_set(&res, 1uL); |
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105 |
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106 /* set initial mode and bit cnt */ |
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107 mode = 0; |
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108 bitcnt = 1; |
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109 buf = 0; |
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110 digidx = X->used - 1; |
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111 bitcpy = 0; |
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112 bitbuf = 0; |
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113 |
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114 for (;;) { |
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115 /* grab next digit as required */ |
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116 if (--bitcnt == 0) { |
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117 /* if digidx == -1 we are out of digits */ |
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118 if (digidx == -1) { |
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119 break; |
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120 } |
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121 /* read next digit and reset the bitcnt */ |
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122 buf = X->dp[digidx--]; |
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123 bitcnt = (int)MP_DIGIT_BIT; |
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124 } |
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125 |
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126 /* grab the next msb from the exponent */ |
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127 y = (buf >> (mp_digit)(MP_DIGIT_BIT - 1)) & 1uL; |
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128 buf <<= (mp_digit)1; |
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129 |
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130 /* if the bit is zero and mode == 0 then we ignore it |
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131 * These represent the leading zero bits before the first 1 bit |
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132 * in the exponent. Technically this opt is not required but it |
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133 * does lower the # of trivial squaring/reductions used |
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134 */ |
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135 if ((mode == 0) && (y == 0)) { |
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136 continue; |
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137 } |
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138 |
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139 /* if the bit is zero and mode == 1 then we square */ |
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140 if ((mode == 1) && (y == 0)) { |
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Update LibTomMath to 1.2.0 (#84)
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141 if ((err = mp_sqr(&res, &res)) != MP_OKAY) goto LBL_RES; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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142 if ((err = redux(&res, P, &mu)) != MP_OKAY) goto LBL_RES; |
1655
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|
143 continue; |
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|
144 } |
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145 |
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146 /* else we add it to the window */ |
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147 bitbuf |= (y << (winsize - ++bitcpy)); |
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148 mode = 2; |
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149 |
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150 if (bitcpy == winsize) { |
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151 /* ok window is filled so square as required and multiply */ |
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152 /* square first */ |
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153 for (x = 0; x < winsize; x++) { |
1692
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Update LibTomMath to 1.2.0 (#84)
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|
154 if ((err = mp_sqr(&res, &res)) != MP_OKAY) goto LBL_RES; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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|
155 if ((err = redux(&res, P, &mu)) != MP_OKAY) goto LBL_RES; |
1655
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|
156 } |
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|
157 |
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|
158 /* then multiply */ |
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Update LibTomMath to 1.2.0 (#84)
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159 if ((err = mp_mul(&res, &M[bitbuf], &res)) != MP_OKAY) goto LBL_RES; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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|
160 if ((err = redux(&res, P, &mu)) != MP_OKAY) goto LBL_RES; |
1655
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161 |
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162 /* empty window and reset */ |
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|
163 bitcpy = 0; |
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|
164 bitbuf = 0; |
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165 mode = 1; |
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|
166 } |
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|
167 } |
284
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|
168 |
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169 /* if bits remain then square/multiply */ |
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170 if ((mode == 2) && (bitcpy > 0)) { |
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171 /* square then multiply if the bit is set */ |
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|
172 for (x = 0; x < bitcpy; x++) { |
1692
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|
173 if ((err = mp_sqr(&res, &res)) != MP_OKAY) goto LBL_RES; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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|
174 if ((err = redux(&res, P, &mu)) != MP_OKAY) goto LBL_RES; |
1655
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|
175 |
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176 bitbuf <<= 1; |
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177 if ((bitbuf & (1 << winsize)) != 0) { |
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|
178 /* then multiply */ |
1692
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|
179 if ((err = mp_mul(&res, &M[1], &res)) != MP_OKAY) goto LBL_RES; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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|
180 if ((err = redux(&res, P, &mu)) != MP_OKAY) goto LBL_RES; |
1655
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|
181 } |
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|
182 } |
1655
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183 } |
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184 |
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185 mp_exch(&res, Y); |
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186 err = MP_OKAY; |
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187 LBL_RES: |
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188 mp_clear(&res); |
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189 LBL_MU: |
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190 mp_clear(&mu); |
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191 LBL_M: |
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192 mp_clear(&M[1]); |
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193 for (x = 1<<(winsize-1); x < (1 << winsize); x++) { |
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194 mp_clear(&M[x]); |
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195 } |
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196 return err; |
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197 } |
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198 #endif |