Mercurial > dropbear
annotate libtomcrypt/src/prngs/rng_get_bytes.c @ 598:7ec26a5b92e7
Changelog for 0.53, bump version
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 24 Feb 2011 14:19:36 +0000 (2011-02-24) |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
rev | line source |
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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 * |
382
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9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com |
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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) && !defined(WINCE) |
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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 #if defined(WIN32) || defined(WINCE) |
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91 #define _WIN32_WINNT 0x0400 |
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92 #ifdef WINCE |
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93 #define UNDER_CE |
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94 #define ARM |
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95 #endif |
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96 #include <windows.h> |
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97 #include <wincrypt.h> |
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98 |
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99 static unsigned long rng_win32(unsigned char *buf, unsigned long len, |
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100 void (*callback)(void)) |
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101 { |
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102 HCRYPTPROV hProv = 0; |
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103 if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, |
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104 (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) && |
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105 !CryptAcquireContext (&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, |
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106 CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET)) |
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107 return 0; |
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108 |
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109 if (CryptGenRandom(hProv, len, buf) == TRUE) { |
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110 CryptReleaseContext(hProv, 0); |
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111 return len; |
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112 } else { |
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113 CryptReleaseContext(hProv, 0); |
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114 return 0; |
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115 } |
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116 } |
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117 |
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118 #endif /* WIN32 */ |
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119 |
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120 /** |
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121 Read the system RNG |
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122 @param out Destination |
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123 @param outlen Length desired (octets) |
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124 @param callback Pointer to void function to act as "callback" when RNG is slow. This can be NULL |
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125 @return Number of octets read |
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126 */ |
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127 unsigned long rng_get_bytes(unsigned char *out, unsigned long outlen, |
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128 void (*callback)(void)) |
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129 { |
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130 unsigned long x; |
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131 |
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132 LTC_ARGCHK(out != NULL); |
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133 |
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134 #if defined(DEVRANDOM) |
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135 x = rng_nix(out, outlen, callback); if (x != 0) { return x; } |
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136 #endif |
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137 #ifdef WIN32 |
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138 x = rng_win32(out, outlen, callback); if (x != 0) { return x; } |
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139 #endif |
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140 #ifdef ANSI_RNG |
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141 x = rng_ansic(out, outlen, callback); if (x != 0) { return x; } |
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142 #endif |
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143 return 0; |
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144 } |
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145 |
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146 /* $Source: /cvs/libtom/libtomcrypt/src/prngs/rng_get_bytes.c,v $ */ |
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147 /* $Revision: 1.5 $ */ |
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148 /* $Date: 2006/12/06 02:01:29 $ */ |