Mercurial > dropbear

annotate libtomcrypt/src/prngs/sprng.c @ 1717:295377ecbf49

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Add DEVELOPING.md
author Matt Johnston <matt@ucc.asn.au>
date Mon, 15 Jun 2020 22:30:28 +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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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 */
285
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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);
285
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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
285
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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 */
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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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
285
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150 return CRYPT_OK;
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151 #endif
285
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152 }
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153
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diff changeset
154 #endif
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155
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156
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157
285
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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: $Format:%ai$ */