Mercurial > dropbear

annotate src/prngs/sprng.c @ 222:36160290a1b2 libtomcrypt LTC_DB_0.46

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* change include path of options.h * don't use the constant ROL/ROR operations, since compilers seem to have problems
author Matt Johnston <matt@ucc.asn.au>
date Fri, 08 Jul 2005 19:13:24 +0000
parents 39d5d58461d6
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 * 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 sprng.c
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15 Secure PRNG, Tom St Denis
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16 */
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17
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18 /* A secure PRNG using the RNG functions. Basically this is a
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19 * wrapper that allows you to use a secure RNG as a PRNG
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20 * in the various other functions.
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21 */
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22
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23 #ifdef SPRNG
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24
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25 const struct ltc_prng_descriptor sprng_desc =
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26 {
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27 "sprng", 0,
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28 &sprng_start,
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29 &sprng_add_entropy,
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30 &sprng_ready,
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31 &sprng_read,
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32 &sprng_done,
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33 &sprng_export,
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34 &sprng_import,
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35 &sprng_test
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36 };
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37
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38 /**
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39 Start the PRNG
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40 @param prng [out] The PRNG state to initialize
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41 @return CRYPT_OK if successful
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42 */
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43 int sprng_start(prng_state *prng)
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44 {
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45 return CRYPT_OK;
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46 }
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47
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48 /**
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49 Add entropy to the PRNG state
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50 @param in The data to add
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51 @param inlen Length of the data to add
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52 @param prng PRNG state to update
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53 @return CRYPT_OK if successful
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54 */
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55 int sprng_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng)
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56 {
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57 return CRYPT_OK;
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58 }
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59
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60 /**
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61 Make the PRNG ready to read from
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62 @param prng The PRNG to make active
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63 @return CRYPT_OK if successful
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64 */
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65 int sprng_ready(prng_state *prng)
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66 {
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67 return CRYPT_OK;
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68 }
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69
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70 /**
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71 Read from the PRNG
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72 @param out Destination
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73 @param outlen Length of output
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74 @param prng The active PRNG to read from
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75 @return Number of octets read
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76 */
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77 unsigned long sprng_read(unsigned char *out, unsigned long outlen, prng_state *prng)
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78 {
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79 LTC_ARGCHK(out != NULL);
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80 return rng_get_bytes(out, outlen, NULL);
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81 }
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82
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83 /**
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84 Terminate the PRNG
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85 @param prng The PRNG to terminate
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86 @return CRYPT_OK if successful
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87 */
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88 int sprng_done(prng_state *prng)
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89 {
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90 return CRYPT_OK;
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91 }
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92
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93 /**
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94 Export the PRNG state
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95 @param out [out] Destination
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96 @param outlen [in/out] Max size and resulting size of the state
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97 @param prng The PRNG to export
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98 @return CRYPT_OK if successful
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99 */
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100 int sprng_export(unsigned char *out, unsigned long *outlen, prng_state *prng)
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101 {
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102 LTC_ARGCHK(outlen != NULL);
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103
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104 *outlen = 0;
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105 return CRYPT_OK;
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106 }
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107
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108 /**
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109 Import a PRNG state
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110 @param in The PRNG state
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111 @param inlen Size of the state
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112 @param prng The PRNG to import
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113 @return CRYPT_OK if successful
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114 */
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115 int sprng_import(const unsigned char *in, unsigned long inlen, prng_state *prng)
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116 {
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117 return CRYPT_OK;
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118 }
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119
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120 /**
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121 PRNG self-test
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122 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
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123 */
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124 int sprng_test(void)
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125 {
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126 return CRYPT_OK;
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127 }
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128
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129 #endif
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130
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131
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132
209
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133
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134 /* $Source: /cvs/libtom/libtomcrypt/src/prngs/sprng.c,v $ */
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135 /* $Revision: 1.3 $ */
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136 /* $Date: 2005/05/05 14:35:59 $ */