Mercurial > dropbear
annotate libtommath/bn_mp_prime_rand.c @ 1723:5386011b740d
Disable toom and karatsuba for new libtommath
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 18 Jun 2020 19:12:07 +0800 |
parents | 1051e4eea25a |
children |
rev | line source |
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1692
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Update LibTomMath to 1.2.0 (#84)
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1 #include "tommath_private.h" |
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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 |
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6 /* makes a truly random prime of a given size (bits), |
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7 * |
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8 * Flags are as follows: |
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9 * |
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10 * MP_PRIME_BBS - make prime congruent to 3 mod 4 |
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11 * MP_PRIME_SAFE - make sure (p-1)/2 is prime as well (implies MP_PRIME_BBS) |
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12 * MP_PRIME_2MSB_ON - make the 2nd highest bit one |
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13 * |
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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 |
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15 * have passed to the callback (e.g. a state or something). This function doesn't use "dat" itself |
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16 * so it can be NULL |
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17 * |
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18 */ |
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19 |
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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 |
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41 /* we need a buffer of bsize bytes */ |
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42 tmp = (unsigned char *) MP_MALLOC((size_t)bsize); |
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43 if (tmp == NULL) { |
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44 return MP_MEM; |
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45 } |
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46 |
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47 /* calc the maskAND value for the MSbyte*/ |
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48 maskAND = ((size&7) == 0) ? 0xFFu : (unsigned char)(0xFFu >> (8 - (size & 7))); |
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49 |
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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; |
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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 |
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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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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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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"*/ |
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80 if ((err = mp_from_ubin(a, tmp, (size_t)bsize)) != MP_OKAY) { |
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81 goto error; |
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82 } |
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83 |
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84 /* is it prime? */ |
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85 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) { |
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86 goto error; |
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87 } |
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88 if (res == MP_NO) { |
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89 continue; |
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90 } |
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91 |
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92 if ((flags & MP_PRIME_SAFE) != 0) { |
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93 /* see if (a-1)/2 is prime */ |
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94 if ((err = mp_sub_d(a, 1uL, a)) != MP_OKAY) { |
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95 goto error; |
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96 } |
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97 if ((err = mp_div_2(a, a)) != MP_OKAY) { |
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98 goto error; |
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99 } |
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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) { |
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103 goto error; |
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104 } |
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105 } |
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106 } while (res == MP_NO); |
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107 |
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108 if ((flags & MP_PRIME_SAFE) != 0) { |
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109 /* restore a to the original value */ |
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110 if ((err = mp_mul_2(a, a)) != MP_OKAY) { |
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111 goto error; |
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112 } |
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113 if ((err = mp_add_d(a, 1uL, a)) != MP_OKAY) { |
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114 goto error; |
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115 } |
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116 } |
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117 |
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118 err = MP_OKAY; |
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119 error: |
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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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123 |
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124 static int s_mp_rand_cb(unsigned char *dst, int len, void *dat) |
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125 { |
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126 (void)dat; |
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127 if (len <= 0) { |
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128 return len; |
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129 } |
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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 |