Mercurial > dropbear
annotate libtomcrypt/src/prngs/sprng.c @ 1854:cba37fe1ddc8
Fix accidentally committed debug message
Was added Oct 18 2021
"Only redirect stderr after the session login."
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 22 Jan 2022 12:46:08 +0800 |
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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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22 |
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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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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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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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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); |
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95 return CRYPT_OK; |
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96 } |
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97 |
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98 /** |
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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 */ |
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105 int sprng_export(unsigned char *out, unsigned long *outlen, prng_state *prng) |
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106 { |
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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); |
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110 |
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111 *outlen = 0; |
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112 return CRYPT_OK; |
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113 } |
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114 |
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115 /** |
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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 */ |
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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); |
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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 */ |
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134 int sprng_test(void) |
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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 |
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150 return CRYPT_OK; |
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151 #endif |
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152 } |
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153 |
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154 #endif |
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155 |
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156 |
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157 |
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158 |
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159 /* ref: $Format:%D$ */ |
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160 /* git commit: $Format:%H$ */ |
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161 /* commit time: $Format:%ai$ */ |