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annotate libtommath/bn_mp_rand.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents f52919ffd3b1
children 1051e4eea25a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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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 */