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annotate src/prngs/rng_get_bytes.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
parents
children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file rng_get_bytes.c
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15 portable way to get secure random bits to feed a PRNG (Tom St Denis)
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16 */
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17
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18 #ifdef DEVRANDOM
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19 /* on *NIX read /dev/random */
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20 static unsigned long rng_nix(unsigned char *buf, unsigned long len,
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21 void (*callback)(void))
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22 {
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23 #ifdef LTC_NO_FILE
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24 return 0;
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25 #else
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26 FILE *f;
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27 unsigned long x;
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28 #ifdef TRY_URANDOM_FIRST
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29 f = fopen("/dev/urandom", "rb");
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30 if (f == NULL)
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31 #endif /* TRY_URANDOM_FIRST */
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32 f = fopen("/dev/random", "rb");
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33
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34 if (f == NULL) {
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35 return 0;
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36 }
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37
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38 /* disable buffering */
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39 if (setvbuf(f, NULL, _IONBF, 0) != 0) {
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40 fclose(f);
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41 return 0;
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42 }
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43
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44 x = (unsigned long)fread(buf, 1, (size_t)len, f);
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45 fclose(f);
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46 return x;
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47 #endif /* LTC_NO_FILE */
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48 }
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49
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50 #endif /* DEVRANDOM */
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51
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52 /* on ANSI C platforms with 100 < CLOCKS_PER_SEC < 10000 */
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53 #if defined(CLOCKS_PER_SEC)
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54
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55 #define ANSI_RNG
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56
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57 static unsigned long rng_ansic(unsigned char *buf, unsigned long len,
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58 void (*callback)(void))
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59 {
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60 clock_t t1;
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61 int l, acc, bits, a, b;
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62
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63 if (XCLOCKS_PER_SEC < 100 || XCLOCKS_PER_SEC > 10000) {
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64 return 0;
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65 }
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66
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67 l = len;
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68 bits = 8;
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69 acc = a = b = 0;
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70 while (len--) {
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71 if (callback != NULL) callback();
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72 while (bits--) {
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73 do {
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74 t1 = XCLOCK(); while (t1 == XCLOCK()) a ^= 1;
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75 t1 = XCLOCK(); while (t1 == XCLOCK()) b ^= 1;
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76 } while (a == b);
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77 acc = (acc << 1) | a;
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78 }
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79 *buf++ = acc;
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80 acc = 0;
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81 bits = 8;
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82 }
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83 acc = bits = a = b = 0;
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84 return l;
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85 }
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86
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87 #endif
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88
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89 /* Try the Microsoft CSP */
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90 #ifdef WIN32
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91 #define _WIN32_WINNT 0x0400
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92 #include <windows.h>
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93 #include <wincrypt.h>
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94
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95 static unsigned long rng_win32(unsigned char *buf, unsigned long len,
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96 void (*callback)(void))
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97 {
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98 HCRYPTPROV hProv = 0;
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99 if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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100 (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) &&
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101 !CryptAcquireContext (&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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102 CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET))
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103 return 0;
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104
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105 if (CryptGenRandom(hProv, len, buf) == TRUE) {
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106 CryptReleaseContext(hProv, 0);
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107 return len;
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108 } else {
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109 CryptReleaseContext(hProv, 0);
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110 return 0;
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111 }
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112 }
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113
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114 #endif /* WIN32 */
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115
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116 /**
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117 Read the system RNG
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118 @param out Destination
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119 @param outlen Length desired (octets)
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120 @param callback Pointer to void function to act as "callback" when RNG is slow. This can be NULL
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121 @return Number of octets read
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122 */
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123 unsigned long rng_get_bytes(unsigned char *out, unsigned long outlen,
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124 void (*callback)(void))
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125 {
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126 unsigned long x;
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127
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128 LTC_ARGCHK(out != NULL);
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129
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130 #if defined(DEVRANDOM)
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131 x = rng_nix(out, outlen, callback); if (x != 0) { return x; }
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132 #endif
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133 #ifdef WIN32
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134 x = rng_win32(out, outlen, callback); if (x != 0) { return x; }
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135 #endif
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136 #ifdef ANSI_RNG
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137 x = rng_ansic(out, outlen, callback); if (x != 0) { return x; }
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138 #endif
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139 return 0;
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140 }