Mercurial > dropbear
annotate libtomcrypt/src/prngs/sober128.c @ 1861:2b3a8026a6ce
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 | e9dba7abd939 |
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| rev | line source |
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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 |
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10 #include "tomcrypt.h" |
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11 |
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12 /** |
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13 @file prngs/sober128.c |
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14 Implementation of SOBER-128 by Tom St Denis. |
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15 Based on s128fast.c reference code supplied by Greg Rose of QUALCOMM. |
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16 */ |
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17 |
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18 #ifdef LTC_SOBER128 |
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19 |
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20 const struct ltc_prng_descriptor sober128_desc = |
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21 { |
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22 "sober128", |
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23 40, |
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24 &sober128_start, |
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25 &sober128_add_entropy, |
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26 &sober128_ready, |
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27 &sober128_read, |
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28 &sober128_done, |
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29 &sober128_export, |
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30 &sober128_import, |
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31 &sober128_test |
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32 }; |
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33 |
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34 /** |
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35 Start the PRNG |
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36 @param prng [out] The PRNG state to initialize |
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37 @return CRYPT_OK if successful |
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38 */ |
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39 int sober128_start(prng_state *prng) |
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40 { |
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41 LTC_ARGCHK(prng != NULL); |
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42 prng->ready = 0; |
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43 XMEMSET(&prng->sober128.ent, 0, sizeof(prng->sober128.ent)); |
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44 prng->sober128.idx = 0; |
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45 LTC_MUTEX_INIT(&prng->lock) |
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46 return CRYPT_OK; |
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47 } |
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48 |
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49 /** |
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50 Add entropy to the PRNG state |
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51 @param in The data to add |
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52 @param inlen Length of the data to add |
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53 @param prng PRNG state to update |
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54 @return CRYPT_OK if successful |
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55 */ |
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56 int sober128_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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57 { |
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58 unsigned char buf[40]; |
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59 unsigned long i; |
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60 int err; |
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61 |
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62 LTC_ARGCHK(prng != NULL); |
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63 LTC_ARGCHK(in != NULL); |
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64 LTC_ARGCHK(inlen > 0); |
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65 |
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66 LTC_MUTEX_LOCK(&prng->lock); |
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67 if (prng->ready) { |
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68 /* sober128_ready() was already called, do "rekey" operation */ |
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69 if ((err = sober128_stream_keystream(&prng->sober128.s, buf, sizeof(buf))) != CRYPT_OK) goto LBL_UNLOCK; |
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70 for(i = 0; i < inlen; i++) buf[i % sizeof(buf)] ^= in[i]; |
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71 /* key 32 bytes, 20 rounds */ |
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72 if ((err = sober128_stream_setup(&prng->sober128.s, buf, 32)) != CRYPT_OK) goto LBL_UNLOCK; |
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73 /* iv 8 bytes */ |
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74 if ((err = sober128_stream_setiv(&prng->sober128.s, buf + 32, 8)) != CRYPT_OK) goto LBL_UNLOCK; |
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75 /* clear KEY + IV */ |
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76 zeromem(buf, sizeof(buf)); |
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77 } |
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78 else { |
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79 /* sober128_ready() was not called yet, add entropy to ent buffer */ |
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80 while (inlen--) prng->sober128.ent[prng->sober128.idx++ % sizeof(prng->sober128.ent)] ^= *in++; |
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81 } |
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82 err = CRYPT_OK; |
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83 LBL_UNLOCK: |
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84 LTC_MUTEX_UNLOCK(&prng->lock); |
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85 return err; |
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86 } |
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87 |
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88 /** |
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89 Make the PRNG ready to read from |
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90 @param prng The PRNG to make active |
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91 @return CRYPT_OK if successful |
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92 */ |
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93 int sober128_ready(prng_state *prng) |
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94 { |
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95 int err; |
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96 |
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97 LTC_ARGCHK(prng != NULL); |
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98 |
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99 LTC_MUTEX_LOCK(&prng->lock); |
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100 if (prng->ready) { err = CRYPT_OK; goto LBL_UNLOCK; } |
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101 /* key 32 bytes, 20 rounds */ |
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102 if ((err = sober128_stream_setup(&prng->sober128.s, prng->sober128.ent, 32)) != CRYPT_OK) goto LBL_UNLOCK; |
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103 /* iv 8 bytes */ |
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104 if ((err = sober128_stream_setiv(&prng->sober128.s, prng->sober128.ent + 32, 8)) != CRYPT_OK) goto LBL_UNLOCK; |
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105 XMEMSET(&prng->sober128.ent, 0, sizeof(prng->sober128.ent)); |
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106 prng->sober128.idx = 0; |
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107 prng->ready = 1; |
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108 LBL_UNLOCK: |
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109 LTC_MUTEX_UNLOCK(&prng->lock); |
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110 return err; |
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111 } |
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112 |
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113 /** |
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114 Read from the PRNG |
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115 @param out Destination |
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116 @param outlen Length of output |
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117 @param prng The active PRNG to read from |
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118 @return Number of octets read |
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119 */ |
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120 unsigned long sober128_read(unsigned char *out, unsigned long outlen, prng_state *prng) |
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121 { |
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122 if (outlen == 0 || prng == NULL || out == NULL) return 0; |
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123 LTC_MUTEX_LOCK(&prng->lock); |
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124 if (!prng->ready) { outlen = 0; goto LBL_UNLOCK; } |
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125 if (sober128_stream_keystream(&prng->sober128.s, out, outlen) != CRYPT_OK) outlen = 0; |
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126 LBL_UNLOCK: |
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127 LTC_MUTEX_UNLOCK(&prng->lock); |
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128 return outlen; |
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129 } |
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130 |
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131 /** |
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132 Terminate the PRNG |
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133 @param prng The PRNG to terminate |
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134 @return CRYPT_OK if successful |
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135 */ |
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136 int sober128_done(prng_state *prng) |
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137 { |
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138 int err; |
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139 LTC_ARGCHK(prng != NULL); |
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140 LTC_MUTEX_LOCK(&prng->lock); |
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141 prng->ready = 0; |
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142 err = sober128_stream_done(&prng->sober128.s); |
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143 LTC_MUTEX_UNLOCK(&prng->lock); |
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144 LTC_MUTEX_DESTROY(&prng->lock); |
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145 return err; |
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146 } |
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147 |
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148 /** |
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149 Export the PRNG state |
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150 @param out [out] Destination |
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151 @param outlen [in/out] Max size and resulting size of the state |
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152 @param prng The PRNG to export |
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153 @return CRYPT_OK if successful |
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154 */ |
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155 int sober128_export(unsigned char *out, unsigned long *outlen, prng_state *prng) |
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156 { |
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157 unsigned long len = sober128_desc.export_size; |
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158 |
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159 LTC_ARGCHK(prng != NULL); |
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160 LTC_ARGCHK(out != NULL); |
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161 LTC_ARGCHK(outlen != NULL); |
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162 |
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163 if (*outlen < len) { |
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164 *outlen = len; |
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165 return CRYPT_BUFFER_OVERFLOW; |
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166 } |
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167 |
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168 if (sober128_read(out, len, prng) != len) { |
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169 return CRYPT_ERROR_READPRNG; |
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170 } |
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171 |
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172 *outlen = len; |
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173 return CRYPT_OK; |
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174 } |
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175 |
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176 /** |
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177 Import a PRNG state |
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178 @param in The PRNG state |
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179 @param inlen Size of the state |
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180 @param prng The PRNG to import |
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181 @return CRYPT_OK if successful |
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182 */ |
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183 int sober128_import(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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184 { |
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185 int err; |
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186 |
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187 LTC_ARGCHK(prng != NULL); |
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188 LTC_ARGCHK(in != NULL); |
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189 if (inlen < (unsigned long)sober128_desc.export_size) return CRYPT_INVALID_ARG; |
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190 |
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191 if ((err = sober128_start(prng)) != CRYPT_OK) return err; |
| 1711 | 192 if ((err = sober128_add_entropy(in, inlen, prng)) != CRYPT_OK) return err; |
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193 return CRYPT_OK; |
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194 } |
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195 |
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196 /** |
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197 PRNG self-test |
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198 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled |
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199 */ |
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200 int sober128_test(void) |
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201 { |
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202 #ifndef LTC_TEST |
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203 return CRYPT_NOP; |
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204 #else |
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205 prng_state st; |
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206 unsigned char en[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, |
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207 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, |
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208 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, |
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209 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, |
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210 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32 }; |
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211 unsigned char dmp[300]; |
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212 unsigned long dmplen = sizeof(dmp); |
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213 unsigned char out[500]; |
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214 unsigned char t1[] = { 0x31, 0x82, 0xA7, 0xA5, 0x8B, 0xD7, 0xCB, 0x39, 0x86, 0x1A }; |
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215 unsigned char t2[] = { 0x6B, 0x43, 0x9E, 0xBC, 0xE7, 0x62, 0x9B, 0xE6, 0x9B, 0x83 }; |
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216 unsigned char t3[] = { 0x4A, 0x0E, 0x6C, 0xC1, 0xCF, 0xB4, 0x73, 0x49, 0x99, 0x05 }; |
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217 int err; |
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218 |
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219 if ((err = sober128_start(&st)) != CRYPT_OK) return err; |
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220 /* add entropy to uninitialized prng */ |
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221 if ((err = sober128_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err; |
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222 if ((err = sober128_ready(&st)) != CRYPT_OK) return err; |
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223 if (sober128_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */ |
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224 if (compare_testvector(out, 10, t1, sizeof(t1), "SOBER128-PRNG", 1)) return CRYPT_FAIL_TESTVECTOR; |
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225 if (sober128_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ |
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226 /* add entropy to already initialized prng */ |
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227 if ((err = sober128_add_entropy(en, sizeof(en), &st)) != CRYPT_OK) return err; |
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228 if (sober128_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ |
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229 if ((err = sober128_export(dmp, &dmplen, &st)) != CRYPT_OK) return err; |
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230 if (sober128_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ |
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231 if (sober128_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */ |
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232 if (compare_testvector(out, 10, t2, sizeof(t2), "SOBER128-PRNG", 2)) return CRYPT_FAIL_TESTVECTOR; |
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233 if ((err = sober128_done(&st)) != CRYPT_OK) return err; |
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234 if ((err = sober128_import(dmp, dmplen, &st)) != CRYPT_OK) return err; |
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235 if ((err = sober128_ready(&st)) != CRYPT_OK) return err; |
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236 if (sober128_read(out, 500, &st) != 500) return CRYPT_ERROR_READPRNG; /* skip 500 bytes */ |
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237 if (sober128_read(out, 10, &st) != 10) return CRYPT_ERROR_READPRNG; /* 10 bytes for testing */ |
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238 if (compare_testvector(out, 10, t3, sizeof(t3), "SOBER128-PRNG", 3)) return CRYPT_FAIL_TESTVECTOR; |
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239 if ((err = sober128_done(&st)) != CRYPT_OK) return err; |
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240 |
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241 return CRYPT_OK; |
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242 #endif |
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243 } |
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244 |
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245 #endif |
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246 |
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247 /* ref: $Format:%D$ */ |
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248 /* git commit: $Format:%H$ */ |
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249 /* commit time: $Format:%ai$ */ |