Mercurial > dropbear

annotate libtomcrypt/src/prngs/rng_get_bytes.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +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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36
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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45 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84 #endif
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85
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86 /* Try the Microsoft CSP */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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95
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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: $Format:%ai$ */