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annotate ltc_prng.c @ 1509:3520d7c25363 coverity

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author Matt Johnston <matt@ucc.asn.au>
date Sat, 10 Feb 2018 19:06:13 +0800
parents 750ec4ec4cbe
children d68d61e7056a
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1 /* Copied from libtomcrypt/src/prngs/sprng.c and modified to
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2 * use Dropbear's genrandom(). */
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3
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4 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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5 *
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6 * LibTomCrypt is a library that provides various cryptographic
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7 * algorithms in a highly modular and flexible manner.
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8 *
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9 * The library is free for all purposes without any express
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10 * guarantee it works.
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11 *
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12 * Tom St Denis, [email protected], http://libtomcrypt.com
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13 */
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14 #include "options.h"
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15 #include "includes.h"
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16 #include "dbrandom.h"
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17 #include "ltc_prng.h"
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18
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19 /**
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20 @file sprng.c
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21 Secure PRNG, Tom St Denis
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22 */
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23
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24 /* A secure PRNG using the RNG functions. Basically this is a
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25 * wrapper that allows you to use a secure RNG as a PRNG
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26 * in the various other functions.
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27 */
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28
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29 #if DROPBEAR_LTC_PRNG
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30
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31 /**
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32 Start the PRNG
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33 @param prng [out] The PRNG state to initialize
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34 @return CRYPT_OK if successful
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35 */
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36 int dropbear_prng_start(prng_state* UNUSED(prng))
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37 {
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38 return CRYPT_OK;
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39 }
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40
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41 /**
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42 Add entropy to the PRNG state
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43 @param in The data to add
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44 @param inlen Length of the data to add
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45 @param prng PRNG state to update
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46 @return CRYPT_OK if successful
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47 */
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48 int dropbear_prng_add_entropy(const unsigned char* UNUSED(in), unsigned long UNUSED(inlen), prng_state* UNUSED(prng))
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49 {
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50 return CRYPT_OK;
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51 }
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52
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53 /**
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54 Make the PRNG ready to read from
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55 @param prng The PRNG to make active
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56 @return CRYPT_OK if successful
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57 */
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58 int dropbear_prng_ready(prng_state* UNUSED(prng))
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59 {
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60 return CRYPT_OK;
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61 }
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62
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63 /**
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64 Read from the PRNG
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65 @param out Destination
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66 @param outlen Length of output
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67 @param prng The active PRNG to read from
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68 @return Number of octets read
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69 */
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70 unsigned long dropbear_prng_read(unsigned char* out, unsigned long outlen, prng_state* UNUSED(prng))
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71 {
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72 LTC_ARGCHK(out != NULL);
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73 genrandom(out, outlen);
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74 return outlen;
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75 }
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76
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77 /**
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78 Terminate the PRNG
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79 @param prng The PRNG to terminate
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80 @return CRYPT_OK if successful
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81 */
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82 int dropbear_prng_done(prng_state* UNUSED(prng))
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83 {
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84 return CRYPT_OK;
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85 }
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86
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87 /**
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88 Export the PRNG state
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89 @param out [out] Destination
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90 @param outlen [in/out] Max size and resulting size of the state
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91 @param prng The PRNG to export
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92 @return CRYPT_OK if successful
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93 */
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94 int dropbear_prng_export(unsigned char* UNUSED(out), unsigned long* outlen, prng_state* UNUSED(prng))
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95 {
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96 LTC_ARGCHK(outlen != NULL);
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97
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98 *outlen = 0;
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99 return CRYPT_OK;
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100 }
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101
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102 /**
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103 Import a PRNG state
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104 @param in The PRNG state
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105 @param inlen Size of the state
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106 @param prng The PRNG to import
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107 @return CRYPT_OK if successful
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108 */
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109 int dropbear_prng_import(const unsigned char* UNUSED(in), unsigned long UNUSED(inlen), prng_state* UNUSED(prng))
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110 {
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111 return CRYPT_OK;
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112 }
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113
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114 /**
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115 PRNG self-test
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116 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
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117 */
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118 int dropbear_prng_test(void)
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119 {
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120 return CRYPT_OK;
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121 }
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122
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123 const struct ltc_prng_descriptor dropbear_prng_desc =
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124 {
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125 "dropbear_prng", 0,
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126 dropbear_prng_start,
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127 dropbear_prng_add_entropy,
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128 dropbear_prng_ready,
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129 dropbear_prng_read,
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130 dropbear_prng_done,
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131 dropbear_prng_export,
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132 dropbear_prng_import,
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133 dropbear_prng_test
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134 };
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135
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136
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137 #endif /* DROPBEAR_LTC_PRNG */