Mercurial > dropbear

annotate libtomcrypt/src/prngs/rng_get_bytes.c @ 1769:0e178f767ada

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Merge from main
author Matt Johnston <matt@ucc.asn.au>
date Thu, 29 Oct 2020 21:51:41 +0800
parents 6dba84798cd5
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9 #include "tomcrypt.h"
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10
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11 #ifdef LTC_RNG_GET_BYTES
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12 /**
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13 @file rng_get_bytes.c
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14 portable way to get secure random bits to feed a PRNG (Tom St Denis)
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15 */
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16
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17 #if defined(LTC_DEVRANDOM) && !defined(_WIN32)
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18 /* on *NIX read /dev/random */
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19 static unsigned long _rng_nix(unsigned char *buf, unsigned long len,
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20 void (*callback)(void))
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21 {
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22 #ifdef LTC_NO_FILE
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23 LTC_UNUSED_PARAM(callback);
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24 LTC_UNUSED_PARAM(buf);
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25 LTC_UNUSED_PARAM(len);
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26 return 0;
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27 #else
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28 FILE *f;
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29 unsigned long x;
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30 LTC_UNUSED_PARAM(callback);
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31 #ifdef LTC_TRY_URANDOM_FIRST
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32 f = fopen("/dev/urandom", "rb");
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33 if (f == NULL)
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34 #endif /* LTC_TRY_URANDOM_FIRST */
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35 f = fopen("/dev/random", "rb");
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37 if (f == NULL) {
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38 return 0;
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39 }
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40
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41 /* disable buffering */
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42 if (setvbuf(f, NULL, _IONBF, 0) != 0) {
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43 fclose(f);
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44 return 0;
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45 }
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46
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47 x = (unsigned long)fread(buf, 1, (size_t)len, f);
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48 fclose(f);
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49 return x;
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50 #endif /* LTC_NO_FILE */
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51 }
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52
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53 #endif /* LTC_DEVRANDOM */
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54
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55 #if !defined(_WIN32_WCE)
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56
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57 #define ANSI_RNG
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58
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59 static unsigned long _rng_ansic(unsigned char *buf, unsigned long len,
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60 void (*callback)(void))
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61 {
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62 clock_t t1;
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63 int l, acc, bits, a, b;
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64
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65 l = len;
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66 bits = 8;
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67 acc = a = b = 0;
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68 while (len--) {
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69 if (callback != NULL) callback();
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70 while (bits--) {
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71 do {
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72 t1 = XCLOCK(); while (t1 == XCLOCK()) a ^= 1;
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73 t1 = XCLOCK(); while (t1 == XCLOCK()) b ^= 1;
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74 } while (a == b);
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75 acc = (acc << 1) | a;
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76 }
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77 *buf++ = acc;
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78 acc = 0;
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79 bits = 8;
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80 }
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81 return l;
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82 }
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83
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84 #endif
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85
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86 /* Try the Microsoft CSP */
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87 #if defined(_WIN32) || defined(_WIN32_WCE)
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88 #ifndef _WIN32_WINNT
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89 #define _WIN32_WINNT 0x0400
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90 #endif
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91 #ifdef _WIN32_WCE
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92 #define UNDER_CE
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93 #define ARM
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94 #endif
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95
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96 #define WIN32_LEAN_AND_MEAN
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97 #include <windows.h>
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98 #include <wincrypt.h>
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99
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100 static unsigned long _rng_win32(unsigned char *buf, unsigned long len,
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101 void (*callback)(void))
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102 {
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103 HCRYPTPROV hProv = 0;
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104 LTC_UNUSED_PARAM(callback);
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105 if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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106 (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) &&
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107 !CryptAcquireContext (&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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108 CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET))
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109 return 0;
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110
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111 if (CryptGenRandom(hProv, len, buf) == TRUE) {
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112 CryptReleaseContext(hProv, 0);
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113 return len;
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114 } else {
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115 CryptReleaseContext(hProv, 0);
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116 return 0;
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117 }
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118 }
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119
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120 #endif /* WIN32 */
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121
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122 /**
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123 Read the system RNG
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124 @param out Destination
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125 @param outlen Length desired (octets)
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126 @param callback Pointer to void function to act as "callback" when RNG is slow. This can be NULL
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127 @return Number of octets read
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128 */
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129 unsigned long rng_get_bytes(unsigned char *out, unsigned long outlen,
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130 void (*callback)(void))
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131 {
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132 unsigned long x;
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133
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134 LTC_ARGCHK(out != NULL);
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135
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136 #ifdef LTC_PRNG_ENABLE_LTC_RNG
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137 if (ltc_rng) {
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138 x = ltc_rng(out, outlen, callback);
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139 if (x != 0) {
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140 return x;
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141 }
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142 }
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143 #endif
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144
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145 #if defined(_WIN32) || defined(_WIN32_WCE)
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146 x = _rng_win32(out, outlen, callback); if (x != 0) { return x; }
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147 #elif defined(LTC_DEVRANDOM)
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148 x = _rng_nix(out, outlen, callback); if (x != 0) { return x; }
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149 #endif
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150 #ifdef ANSI_RNG
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151 x = _rng_ansic(out, outlen, callback); if (x != 0) { return x; }
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152 #endif
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153 return 0;
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154 }
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155 #endif /* #ifdef LTC_RNG_GET_BYTES */
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156
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157 /* ref: $Format:%D$ */
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158 /* git commit: $Format:%H$ */
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159 /* commit time: $Format:%ai$ */