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annotate rng_get_bytes.c @ 0:d7da3b1e1540 libtomcrypt

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put back the 0.95 makefile which was inadvertently merged over
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:21:40 +0000
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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 /* portable way to get secure random bits to feed a PRNG */
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12 #include "mycrypt.h"
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13
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14 #ifdef DEVRANDOM
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15 /* on *NIX read /dev/random */
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16 static unsigned long rng_nix(unsigned char *buf, unsigned long len,
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17 void (*callback)(void))
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18 {
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19 #ifdef NO_FILE
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20 return 0;
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21 #else
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22 FILE *f;
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23 unsigned long x;
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24 #ifdef TRY_URANDOM_FIRST
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25 f = fopen("/dev/urandom", "rb");
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26 if (f == NULL)
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27 #endif /* TRY_URANDOM_FIRST */
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28 f = fopen("/dev/random", "rb");
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29
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30 if (f == NULL) {
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31 return 0;
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32 }
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33
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34 /* disable buffering */
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35 if (setvbuf(f, NULL, _IONBF, 0) != 0) {
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36 fclose(f);
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37 return 0;
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38 }
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39
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40 x = (unsigned long)fread(buf, 1, (size_t)len, f);
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41 fclose(f);
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42 return x;
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43 #endif /* NO_FILE */
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44 }
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45
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46 #endif /* DEVRANDOM */
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47
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48 /* on ANSI C platforms with 100 < CLOCKS_PER_SEC < 10000 */
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49 #if defined(CLOCKS_PER_SEC)
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50
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51 #define ANSI_RNG
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52
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53 static unsigned long rng_ansic(unsigned char *buf, unsigned long len,
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54 void (*callback)(void))
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55 {
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56 clock_t t1;
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57 int l, acc, bits, a, b;
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58
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59 if (XCLOCKS_PER_SEC < 100 || XCLOCKS_PER_SEC > 10000) {
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60 return 0;
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61 }
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62
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63 l = len;
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64 bits = 8;
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65 acc = a = b = 0;
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66 while (len--) {
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67 if (callback != NULL) callback();
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68 while (bits--) {
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69 do {
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70 t1 = XCLOCK(); while (t1 == XCLOCK()) a ^= 1;
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71 t1 = XCLOCK(); while (t1 == XCLOCK()) b ^= 1;
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72 } while (a == b);
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73 acc = (acc << 1) | a;
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74 }
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75 *buf++ = acc;
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76 acc = 0;
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77 bits = 8;
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78 }
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79 acc = bits = a = b = 0;
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80 return l;
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81 }
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82
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83 #endif
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84
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85 /* Try the Microsoft CSP */
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86 #ifdef WIN32
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87 #define _WIN32_WINNT 0x0400
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88 #include <windows.h>
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89 #include <wincrypt.h>
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90
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91 static unsigned long rng_win32(unsigned char *buf, unsigned long len,
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92 void (*callback)(void))
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93 {
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94 HCRYPTPROV hProv = 0;
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95 if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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96 (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) &&
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97 !CryptAcquireContext (&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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98 CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET))
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99 return 0;
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100
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101 if (CryptGenRandom(hProv, len, buf) == TRUE) {
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102 CryptReleaseContext(hProv, 0);
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103 return len;
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104 } else {
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105 CryptReleaseContext(hProv, 0);
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106 return 0;
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107 }
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108 }
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109
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110 #endif /* WIN32 */
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111
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112 unsigned long rng_get_bytes(unsigned char *buf, unsigned long len,
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113 void (*callback)(void))
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114 {
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115 unsigned long x;
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116
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117 _ARGCHK(buf != NULL);
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118
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119 #if defined(DEVRANDOM)
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120 x = rng_nix(buf, len, callback); if (x != 0) { return x; }
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121 #endif
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122 #ifdef WIN32
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123 x = rng_win32(buf, len, callback); if (x != 0) { return x; }
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124 #endif
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125 #ifdef ANSI_RNG
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126 x = rng_ansic(buf, len, callback); if (x != 0) { return x; }
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127 #endif
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128 return 0;
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129 }