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annotate ltc_prng.c @ 755:b07eb3dc23ec ecc

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refactor kexdh code a bit, start working on ecdh etc
author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 Mar 2013 01:35:22 +0800
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children 76fba0856749
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755
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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 "random.h"
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17
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18 /**
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19 @file sprng.c
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20 Secure PRNG, Tom St Denis
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21 */
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22
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23 /* A secure PRNG using the RNG functions. Basically this is a
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24 * wrapper that allows you to use a secure RNG as a PRNG
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25 * in the various other functions.
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26 */
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27
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28 #ifdef DROPBEAR_LTC_PRNG
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29
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30 /**
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31 Start the PRNG
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32 @param prng [out] The PRNG state to initialize
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33 @return CRYPT_OK if successful
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34 */
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35 int dropbear_prng_start(prng_state *prng)
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36 {
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37 return CRYPT_OK;
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38 }
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39
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40 /**
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41 Add entropy to the PRNG state
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42 @param in The data to add
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43 @param inlen Length of the data to add
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44 @param prng PRNG state to update
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45 @return CRYPT_OK if successful
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46 */
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47 int dropbear_prng_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng)
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48 {
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49 return CRYPT_OK;
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50 }
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51
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52 /**
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53 Make the PRNG ready to read from
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54 @param prng The PRNG to make active
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55 @return CRYPT_OK if successful
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56 */
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57 int dropbear_prng_ready(prng_state *prng)
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58 {
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59 return CRYPT_OK;
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60 }
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61
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62 /**
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63 Read from the PRNG
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64 @param out Destination
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65 @param outlen Length of output
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66 @param prng The active PRNG to read from
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67 @return Number of octets read
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68 */
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69 unsigned long dropbear_prng_read(unsigned char *out, unsigned long outlen, prng_state *prng)
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70 {
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71 LTC_ARGCHK(out != NULL);
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72 genrandom(out, outlen);
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73 return CRYPT_OK;
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74 }
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75
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76 /**
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77 Terminate the PRNG
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78 @param prng The PRNG to terminate
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79 @return CRYPT_OK if successful
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80 */
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81 int dropbear_prng_done(prng_state *prng)
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82 {
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83 return CRYPT_OK;
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84 }
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85
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86 /**
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87 Export the PRNG state
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88 @param out [out] Destination
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89 @param outlen [in/out] Max size and resulting size of the state
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90 @param prng The PRNG to export
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91 @return CRYPT_OK if successful
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92 */
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93 int dropbear_prng_export(unsigned char *out, unsigned long *outlen, prng_state *prng)
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94 {
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95 LTC_ARGCHK(outlen != NULL);
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96
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97 *outlen = 0;
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98 return CRYPT_OK;
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99 }
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100
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101 /**
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102 Import a PRNG state
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103 @param in The PRNG state
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104 @param inlen Size of the state
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105 @param prng The PRNG to import
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106 @return CRYPT_OK if successful
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107 */
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108 int dropbear_prng_import(const unsigned char *in, unsigned long inlen, prng_state *prng)
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109 {
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110 return CRYPT_OK;
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111 }
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112
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113 /**
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114 PRNG self-test
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115 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
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116 */
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117 int dropbear_prng_test(void)
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118 {
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119 return CRYPT_OK;
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120 }
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121
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122 const struct ltc_prng_descriptor dropbear_prng_desc =
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123 {
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124 "dropbear_prng", 0,
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125 &dropbear_prng_start,
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126 &dropbear_prng_add_entropy,
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127 &dropbear_prng_ready,
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128 &dropbear_prng_read,
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129 &dropbear_prng_done,
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130 &dropbear_prng_export,
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131 &dropbear_prng_import,
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132 &dropbear_prng_test
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133 };
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134
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135
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136 #endif // DROPBEAR_LTC_PRNG