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annotate libtommath/bn_mp_prime_rand.c @ 1927:dc615fdb7c06

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Fix declaration after statement Caught by just-added c89 build
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Mar 2022 14:32:49 +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)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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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),
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:
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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)
Steffen Jaeckel <s@jaeckel.eu>
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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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parents:
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
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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)) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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30 return MP_VAL;
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31 }
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32
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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33 /* MP_PRIME_SAFE implies MP_PRIME_BBS */
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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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 */
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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;
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45 }
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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*/
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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
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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
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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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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Steffen Jaeckel <s@jaeckel.eu>
parents:
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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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81 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
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82 }
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Steffen Jaeckel <s@jaeckel.eu>
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83
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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:
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86 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
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87 }
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Steffen Jaeckel <s@jaeckel.eu>
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88 if (res == MP_NO) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
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89 continue;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
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90 }
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Steffen Jaeckel <s@jaeckel.eu>
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91
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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) {
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98 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
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99 }
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Steffen Jaeckel <s@jaeckel.eu>
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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) {
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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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107
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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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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parents:
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111 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
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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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Steffen Jaeckel <s@jaeckel.eu>
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115 }
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Steffen Jaeckel <s@jaeckel.eu>
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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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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:
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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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parents:
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125 {
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126 (void)dat;
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parents:
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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:
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129 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
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