Mercurial > dropbear

annotate ltc_prng.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 220f55d540ae
children 210f6b49df89
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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 #ifdef 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
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
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136
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 761
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137 #endif /* DROPBEAR_LTC_PRNG */