Mercurial > dropbear

annotate libtomcrypt/src/prngs/sprng.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file sprng.c
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13 Secure PRNG, Tom St Denis
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14 */
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15
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16 /* A secure PRNG using the RNG functions. Basically this is a
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17 * wrapper that allows you to use a secure RNG as a PRNG
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18 * in the various other functions.
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19 */
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20
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21 #ifdef LTC_SPRNG
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23 const struct ltc_prng_descriptor sprng_desc =
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24 {
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25 "sprng", 0,
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26 &sprng_start,
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27 &sprng_add_entropy,
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28 &sprng_ready,
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29 &sprng_read,
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30 &sprng_done,
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31 &sprng_export,
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32 &sprng_import,
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33 &sprng_test
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34 };
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35
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36 /**
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37 Start the PRNG
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38 @param prng [out] The PRNG state to initialize
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39 @return CRYPT_OK if successful
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40 */
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41 int sprng_start(prng_state *prng)
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42 {
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43 LTC_UNUSED_PARAM(prng);
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44 return CRYPT_OK;
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45 }
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46
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47 /**
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48 Add entropy to the PRNG state
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49 @param in The data to add
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50 @param inlen Length of the data to add
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51 @param prng PRNG state to update
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52 @return CRYPT_OK if successful
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53 */
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54 int sprng_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng)
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55 {
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56 LTC_UNUSED_PARAM(in);
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57 LTC_UNUSED_PARAM(inlen);
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58 LTC_UNUSED_PARAM(prng);
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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 Make the PRNG ready to read from
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64 @param prng The PRNG to make active
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65 @return CRYPT_OK if successful
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 */
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67 int sprng_ready(prng_state *prng)
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68 {
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69 LTC_UNUSED_PARAM(prng);
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70 return CRYPT_OK;
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71 }
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72
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73 /**
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74 Read from the PRNG
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75 @param out Destination
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76 @param outlen Length of output
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77 @param prng The active PRNG to read from
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78 @return Number of octets read
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79 */
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80 unsigned long sprng_read(unsigned char *out, unsigned long outlen, prng_state *prng)
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81 {
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82 LTC_ARGCHK(out != NULL);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 LTC_UNUSED_PARAM(prng);
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84 return rng_get_bytes(out, outlen, NULL);
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85 }
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86
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87 /**
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88 Terminate the PRNG
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89 @param prng The PRNG to terminate
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90 @return CRYPT_OK if successful
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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91 */
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92 int sprng_done(prng_state *prng)
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93 {
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94 LTC_UNUSED_PARAM(prng);
285
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diff changeset
95 return CRYPT_OK;
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96 }
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97
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98 /**
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diff changeset
99 Export the PRNG state
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100 @param out [out] Destination
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101 @param outlen [in/out] Max size and resulting size of the state
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102 @param prng The PRNG to export
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103 @return CRYPT_OK if successful
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104 */
285
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diff changeset
105 int sprng_export(unsigned char *out, unsigned long *outlen, prng_state *prng)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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107 LTC_ARGCHK(outlen != NULL);
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108 LTC_UNUSED_PARAM(out);
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109 LTC_UNUSED_PARAM(prng);
285
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diff changeset
110
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
111 *outlen = 0;
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112 return CRYPT_OK;
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113 }
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114
285
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115 /**
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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116 Import a PRNG state
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117 @param in The PRNG state
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118 @param inlen Size of the state
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119 @param prng The PRNG to import
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120 @return CRYPT_OK if successful
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121 */
285
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122 int sprng_import(const unsigned char *in, unsigned long inlen, prng_state *prng)
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123 {
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124 LTC_UNUSED_PARAM(in);
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125 LTC_UNUSED_PARAM(inlen);
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126 LTC_UNUSED_PARAM(prng);
285
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127 return CRYPT_OK;
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128 }
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129
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130 /**
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131 PRNG self-test
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132 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
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133 */
285
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diff changeset
134 int sprng_test(void)
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diff changeset
135 {
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136 #ifndef LTC_TEST
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137 return CRYPT_NOP;
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138 #else
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139 prng_state st;
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140 unsigned char en[] = { 0x01, 0x02, 0x03, 0x04 };
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141 unsigned char out[1000];
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142 int err;
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143
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144 if ((err = sprng_start(&st)) != CRYPT_OK) return err;
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145 if ((err = sprng_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err;
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146 if ((err = sprng_ready(&st)) != CRYPT_OK) return err;
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147 if (sprng_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */
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148 if ((err = sprng_done(&st)) != CRYPT_OK) return err;
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149
285
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150 return CRYPT_OK;
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diff changeset
151 #endif
285
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152 }
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153
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
154 #endif
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155
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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156
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157
285
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diff changeset
158
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159 /* ref: $Format:%D$ */
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diff changeset
160 /* git commit: $Format:%H$ */
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diff changeset
161 /* commit time: $Format:%ai$ */