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annotate libtommath/bn_s_mp_rand_platform.c @ 1724:ca75bb513359

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_GNU_SOURCE for random
author Matt Johnston <matt@ucc.asn.au>
date Tue, 23 Jun 2020 21:38:46 +0800
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1692
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1 #include "tommath_private.h"
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2 #ifdef BN_S_MP_RAND_PLATFORM_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 /* First the OS-specific special cases
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7 * - *BSD
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8 * - Windows
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9 */
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10 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
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11 #define BN_S_READ_ARC4RANDOM_C
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12 static mp_err s_read_arc4random(void *p, size_t n)
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13 {
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14 arc4random_buf(p, n);
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15 return MP_OKAY;
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16 }
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17 #endif
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18
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19 #if defined(_WIN32) || defined(_WIN32_WCE)
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20 #define BN_S_READ_WINCSP_C
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21
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22 #ifndef _WIN32_WINNT
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23 #define _WIN32_WINNT 0x0400
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24 #endif
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25 #ifdef _WIN32_WCE
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26 #define UNDER_CE
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27 #define ARM
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28 #endif
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29
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30 #define WIN32_LEAN_AND_MEAN
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31 #include <windows.h>
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32 #include <wincrypt.h>
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33
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34 static mp_err s_read_wincsp(void *p, size_t n)
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35 {
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36 static HCRYPTPROV hProv = 0;
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37 if (hProv == 0) {
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38 HCRYPTPROV h = 0;
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39 if (!CryptAcquireContext(&h, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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40 (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) &&
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41 !CryptAcquireContext(&h, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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42 CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET)) {
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43 return MP_ERR;
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44 }
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45 hProv = h;
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46 }
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47 return CryptGenRandom(hProv, (DWORD)n, (BYTE *)p) == TRUE ? MP_OKAY : MP_ERR;
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48 }
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49 #endif /* WIN32 */
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50
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51 #if !defined(BN_S_READ_WINCSP_C) && defined(__linux__) && defined(__GLIBC_PREREQ)
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52 #if __GLIBC_PREREQ(2, 25)
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53 #define BN_S_READ_GETRANDOM_C
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54 #include <sys/random.h>
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55 #include <errno.h>
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56
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57 static mp_err s_read_getrandom(void *p, size_t n)
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58 {
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59 char *q = (char *)p;
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60 while (n > 0u) {
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61 ssize_t ret = getrandom(q, n, 0);
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62 if (ret < 0) {
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63 if (errno == EINTR) {
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64 continue;
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65 }
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66 return MP_ERR;
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67 }
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68 q += ret;
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69 n -= (size_t)ret;
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70 }
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71 return MP_OKAY;
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72 }
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73 #endif
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74 #endif
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75
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76 /* We assume all platforms besides windows provide "/dev/urandom".
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77 * In case yours doesn't, define MP_NO_DEV_URANDOM at compile-time.
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78 */
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79 #if !defined(BN_S_READ_WINCSP_C) && !defined(MP_NO_DEV_URANDOM)
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80 #define BN_S_READ_URANDOM_C
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81 #ifndef MP_DEV_URANDOM
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82 #define MP_DEV_URANDOM "/dev/urandom"
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83 #endif
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84 #include <fcntl.h>
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85 #include <errno.h>
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86 #include <unistd.h>
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87
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88 static mp_err s_read_urandom(void *p, size_t n)
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89 {
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90 int fd;
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91 char *q = (char *)p;
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92
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93 do {
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94 fd = open(MP_DEV_URANDOM, O_RDONLY);
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95 } while ((fd == -1) && (errno == EINTR));
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96 if (fd == -1) return MP_ERR;
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97
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98 while (n > 0u) {
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99 ssize_t ret = read(fd, p, n);
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100 if (ret < 0) {
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101 if (errno == EINTR) {
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102 continue;
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103 }
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104 close(fd);
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105 return MP_ERR;
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106 }
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107 q += ret;
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108 n -= (size_t)ret;
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109 }
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110
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111 close(fd);
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112 return MP_OKAY;
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113 }
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114 #endif
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115
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116 #if defined(MP_PRNG_ENABLE_LTM_RNG)
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117 #define BN_S_READ_LTM_RNG
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118 unsigned long (*ltm_rng)(unsigned char *out, unsigned long outlen, void (*callback)(void));
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119 void (*ltm_rng_callback)(void);
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120
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121 static mp_err s_read_ltm_rng(void *p, size_t n)
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122 {
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123 unsigned long res;
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124 if (ltm_rng == NULL) return MP_ERR;
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125 res = ltm_rng(p, n, ltm_rng_callback);
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126 if (res != n) return MP_ERR;
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127 return MP_OKAY;
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128 }
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129 #endif
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130
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131 mp_err s_read_arc4random(void *p, size_t n);
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132 mp_err s_read_wincsp(void *p, size_t n);
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133 mp_err s_read_getrandom(void *p, size_t n);
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134 mp_err s_read_urandom(void *p, size_t n);
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135 mp_err s_read_ltm_rng(void *p, size_t n);
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136
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137 mp_err s_mp_rand_platform(void *p, size_t n)
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138 {
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139 mp_err err = MP_ERR;
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140 if ((err != MP_OKAY) && MP_HAS(S_READ_ARC4RANDOM)) err = s_read_arc4random(p, n);
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141 if ((err != MP_OKAY) && MP_HAS(S_READ_WINCSP)) err = s_read_wincsp(p, n);
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142 if ((err != MP_OKAY) && MP_HAS(S_READ_GETRANDOM)) err = s_read_getrandom(p, n);
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143 if ((err != MP_OKAY) && MP_HAS(S_READ_URANDOM)) err = s_read_urandom(p, n);
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144 if ((err != MP_OKAY) && MP_HAS(S_READ_LTM_RNG)) err = s_read_ltm_rng(p, n);
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145 return err;
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146 }
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147
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148 #endif