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annotate libtommath/bn_mp_rand.c @ 1656:a36e545fb43d

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Prime-related bugfixes (#81) * Merge pull request #180 from czurnieden/isprimeerror Fixed bug in mp_prime_isprime (cherry picked from commit f3ff7064f3301a2fc11b84d389fd67769862d437) * do 2 MR rounds for numbers >=2048bits * back-port modified mp_prime_next_prime()
author Steffen Jaeckel <s@jaeckel.eu>
date Tue, 17 Sep 2019 16:11:09 +0200
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_RAND_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 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* First the OS-specific special cases
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16 * - *BSD
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17 * - Windows
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18 */
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19 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
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20 #define MP_ARC4RANDOM
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21 #define MP_GEN_RANDOM_MAX 0xffffffffu
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22 #define MP_GEN_RANDOM_SHIFT 32
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23
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24 static int s_read_arc4random(mp_digit *p)
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25 {
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26 mp_digit d = 0, msk = 0;
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27 do {
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28 d <<= MP_GEN_RANDOM_SHIFT;
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29 d |= ((mp_digit) arc4random());
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30 msk <<= MP_GEN_RANDOM_SHIFT;
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31 msk |= (MP_MASK & MP_GEN_RANDOM_MAX);
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32 } while ((MP_MASK & msk) != MP_MASK);
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33 *p = d;
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34 return MP_OKAY;
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35 }
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36 #endif
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37
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38 #if defined(_WIN32) || defined(_WIN32_WCE)
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39 #define MP_WIN_CSP
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40
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41 #ifndef _WIN32_WINNT
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42 #define _WIN32_WINNT 0x0400
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43 #endif
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44 #ifdef _WIN32_WCE
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45 #define UNDER_CE
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46 #define ARM
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47 #endif
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48
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49 #define WIN32_LEAN_AND_MEAN
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50 #include <windows.h>
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51 #include <wincrypt.h>
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52
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53 static HCRYPTPROV hProv = 0;
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54
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55 static void s_cleanup_win_csp(void)
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56 {
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57 CryptReleaseContext(hProv, 0);
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58 hProv = 0;
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59 }
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60
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61 static int s_read_win_csp(mp_digit *p)
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62 {
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63 int ret = -1;
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64 if (hProv == 0) {
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65 if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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66 (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) &&
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67 !CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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68 CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET)) {
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69 hProv = 0;
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70 return ret;
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71 }
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72 atexit(s_cleanup_win_csp);
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73 }
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74 if (CryptGenRandom(hProv, sizeof(*p), (void *)p) == TRUE) {
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75 ret = MP_OKAY;
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76 }
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77 return ret;
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78 }
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79 #endif /* WIN32 */
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80
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81 #if !defined(MP_WIN_CSP) && defined(__linux__) && defined(__GLIBC_PREREQ)
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82 #if __GLIBC_PREREQ(2, 25)
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83 #define MP_GETRANDOM
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84 #include <sys/random.h>
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85 #include <errno.h>
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86
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87 static int s_read_getrandom(mp_digit *p)
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88 {
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89 int ret;
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90 do {
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91 ret = getrandom(p, sizeof(*p), 0);
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92 } while ((ret == -1) && (errno == EINTR));
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93 if (ret == sizeof(*p)) return MP_OKAY;
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94 return -1;
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95 }
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96 #endif
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97 #endif
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98
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99 /* We assume all platforms besides windows provide "/dev/urandom".
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100 * In case yours doesn't, define MP_NO_DEV_URANDOM at compile-time.
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101 */
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102 #if !defined(MP_WIN_CSP) && !defined(MP_NO_DEV_URANDOM)
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103 #ifndef MP_DEV_URANDOM
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104 #define MP_DEV_URANDOM "/dev/urandom"
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105 #endif
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106 #include <fcntl.h>
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107 #include <errno.h>
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108 #include <unistd.h>
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109
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110 static int s_read_dev_urandom(mp_digit *p)
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111 {
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112 ssize_t r;
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113 int fd;
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114 do {
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115 fd = open(MP_DEV_URANDOM, O_RDONLY);
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116 } while ((fd == -1) && (errno == EINTR));
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117 if (fd == -1) return -1;
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118 do {
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119 r = read(fd, p, sizeof(*p));
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120 } while ((r == -1) && (errno == EINTR));
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121 close(fd);
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122 if (r != sizeof(*p)) return -1;
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123 return MP_OKAY;
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124 }
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125 #endif
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126
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127 #if defined(MP_PRNG_ENABLE_LTM_RNG)
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128 unsigned long (*ltm_rng)(unsigned char *out, unsigned long outlen, void (*callback)(void));
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129 void (*ltm_rng_callback)(void);
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130
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131 static int s_read_ltm_rng(mp_digit *p)
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132 {
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133 unsigned long ret;
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134 if (ltm_rng == NULL) return -1;
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135 ret = ltm_rng((void *)p, sizeof(*p), ltm_rng_callback);
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136 if (ret != sizeof(*p)) return -1;
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137 return MP_OKAY;
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138 }
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139 #endif
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140
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141 static int s_rand_digit(mp_digit *p)
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142 {
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143 int ret = -1;
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144
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145 #if defined(MP_ARC4RANDOM)
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146 ret = s_read_arc4random(p);
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147 if (ret == MP_OKAY) return ret;
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148 #endif
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149
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150 #if defined(MP_WIN_CSP)
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151 ret = s_read_win_csp(p);
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152 if (ret == MP_OKAY) return ret;
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153 #else
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154
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155 #if defined(MP_GETRANDOM)
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156 ret = s_read_getrandom(p);
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157 if (ret == MP_OKAY) return ret;
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158 #endif
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159 #if defined(MP_DEV_URANDOM)
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160 ret = s_read_dev_urandom(p);
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161 if (ret == MP_OKAY) return ret;
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162 #endif
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163
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164 #endif /* MP_WIN_CSP */
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165
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166 #if defined(MP_PRNG_ENABLE_LTM_RNG)
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167 ret = s_read_ltm_rng(p);
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168 if (ret == MP_OKAY) return ret;
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169 #endif
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170
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171 return ret;
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172 }
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173
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174 /* makes a pseudo-random int of a given size */
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175 int mp_rand_digit(mp_digit *r)
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176 {
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177 int ret = s_rand_digit(r);
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178 *r &= MP_MASK;
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179 return ret;
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180 }
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181
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182 int mp_rand(mp_int *a, int digits)
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183 {
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184 int res;
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185 mp_digit d;
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186
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187 mp_zero(a);
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188 if (digits <= 0) {
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189 return MP_OKAY;
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190 }
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191
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192 /* first place a random non-zero digit */
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193 do {
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194 if (mp_rand_digit(&d) != MP_OKAY) {
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195 return MP_VAL;
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196 }
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197 } while (d == 0u);
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198
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199 if ((res = mp_add_d(a, d, a)) != MP_OKAY) {
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200 return res;
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201 }
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202
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diff changeset
203 while (--digits > 0) {
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204 if ((res = mp_lshd(a, 1)) != MP_OKAY) {
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205 return res;
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206 }
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207
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208 if (mp_rand_digit(&d) != MP_OKAY) {
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209 return MP_VAL;
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210 }
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211 if ((res = mp_add_d(a, d, a)) != MP_OKAY) {
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212 return res;
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213 }
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214 }
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215
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216 return MP_OKAY;
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parents: 1470
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217 }
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218 #endif
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219
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220 /* ref: HEAD -> master, tag: v1.1.0 */
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221 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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222 /* commit time: 2019-01-28 20:32:32 +0100 */