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annotate libtomcrypt/tests/no_prng.c @ 1690:2a06ef4ba80d
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author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 26 May 2020 23:16:11 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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1471
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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 no_prng.c |
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13 NO PRNG, Steffen Jaeckel |
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14 */ |
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15 |
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16 #ifdef LTC_PKCS_1 |
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17 |
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18 typedef struct |
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19 { |
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20 struct ltc_prng_descriptor desc; |
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21 char name[64]; |
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22 unsigned char entropy[1024]; |
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23 unsigned long len; |
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24 unsigned long offset; |
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25 } no_prng_desc_t; |
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26 |
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27 /** |
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28 Start the PRNG |
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29 @param prng [out] The PRNG state to initialize |
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30 @return CRYPT_OK if successful |
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31 */ |
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32 int no_prng_start(prng_state *prng) |
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33 { |
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34 no_prng_desc_t *no_prng = (no_prng_desc_t*) prng; |
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35 LTC_ARGCHK(no_prng != NULL); |
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36 LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name)); |
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37 no_prng->len = 0; |
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38 no_prng->offset = 0; |
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39 |
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40 return CRYPT_OK; |
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41 } |
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42 |
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43 /** |
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44 Add entropy to the PRNG state |
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45 @param in The data to add |
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46 @param inlen Length of the data to add |
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47 @param prng PRNG state to update |
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48 @return CRYPT_OK if successful |
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49 */ |
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50 int no_prng_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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51 { |
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52 no_prng_desc_t *no_prng = (no_prng_desc_t*) prng; |
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53 LTC_ARGCHK(no_prng != NULL); |
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54 LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name)); |
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55 LTC_ARGCHK(in != NULL); |
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56 LTC_ARGCHK(inlen <= sizeof(no_prng->entropy)); |
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57 |
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58 no_prng->len = MIN(inlen, sizeof(no_prng->entropy)); |
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59 memcpy(no_prng->entropy, in, no_prng->len); |
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60 no_prng->offset = 0; |
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61 |
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62 return CRYPT_OK; |
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63 |
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64 } |
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65 |
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66 /** |
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67 Make the PRNG ready to read from |
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68 @param prng The PRNG to make active |
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69 @return CRYPT_OK if successful |
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70 */ |
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71 int no_prng_ready(prng_state *prng) |
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72 { |
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73 LTC_ARGCHK(prng != NULL); |
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74 |
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75 return CRYPT_OK; |
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76 } |
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77 |
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78 /** |
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79 Read from the PRNG |
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80 @param out Destination |
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81 @param outlen Length of output |
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82 @param prng The active PRNG to read from |
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83 @return Number of octets read |
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84 */ |
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85 unsigned long no_prng_read(unsigned char *out, unsigned long outlen, prng_state *prng) |
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86 { |
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87 no_prng_desc_t *no_prng = (no_prng_desc_t*) prng; |
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88 LTC_ARGCHK(no_prng != NULL); |
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89 LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name)); |
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90 LTC_ARGCHK(out != NULL); |
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91 |
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92 outlen = MIN(outlen, no_prng->len - no_prng->offset); |
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93 memcpy(out, &no_prng->entropy[no_prng->offset], outlen); |
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94 no_prng->offset += outlen; |
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95 |
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96 return outlen; |
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97 } |
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98 |
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99 /** |
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100 Terminate the PRNG |
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101 @param prng The PRNG to terminate |
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102 @return CRYPT_OK if successful |
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103 */ |
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104 int no_prng_done(prng_state *prng) |
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105 { |
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106 LTC_UNUSED_PARAM(prng); |
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107 return CRYPT_OK; |
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108 } |
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109 |
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110 /** |
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111 Export the PRNG state |
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112 @param out [out] Destination |
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113 @param outlen [in/out] Max size and resulting size of the state |
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114 @param prng The PRNG to export |
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115 @return CRYPT_OK if successful |
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116 */ |
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117 int no_prng_export(unsigned char *out, unsigned long *outlen, prng_state *prng) |
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118 { |
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119 LTC_UNUSED_PARAM(out); |
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120 LTC_UNUSED_PARAM(outlen); |
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121 LTC_UNUSED_PARAM(prng); |
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122 return CRYPT_OK; |
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123 } |
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124 |
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125 /** |
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126 Import a PRNG state |
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127 @param in The PRNG state |
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128 @param inlen Size of the state |
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129 @param prng The PRNG to import |
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130 @return CRYPT_OK if successful |
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131 */ |
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132 int no_prng_import(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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133 { |
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134 LTC_UNUSED_PARAM(in); |
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135 LTC_UNUSED_PARAM(inlen); |
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136 LTC_UNUSED_PARAM(prng); |
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137 return CRYPT_OK; |
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138 } |
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139 |
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140 /** |
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141 PRNG self-test |
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142 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled |
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143 */ |
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144 int no_prng_test(void) |
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145 { |
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146 return CRYPT_OK; |
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147 } |
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148 |
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149 static const struct ltc_prng_descriptor no_prng_desc = |
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150 { |
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151 NULL, 0, |
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152 &no_prng_start, |
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153 &no_prng_add_entropy, |
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154 &no_prng_ready, |
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155 &no_prng_read, |
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156 &no_prng_done, |
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157 &no_prng_export, |
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158 &no_prng_import, |
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159 &no_prng_test |
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160 }; |
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161 |
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162 struct ltc_prng_descriptor* no_prng_desc_get(void) |
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163 { |
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164 no_prng_desc_t* no_prng = XMALLOC(sizeof(*no_prng)); |
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165 LTC_ARGCHK(no_prng != NULL); |
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166 XMEMCPY(&no_prng->desc, &no_prng_desc, sizeof(no_prng_desc)); |
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167 LTC_ARGCHK(snprintf(no_prng->name, sizeof(no_prng->name), "no_prng@%p", no_prng) < (int)sizeof(no_prng->name)); |
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168 no_prng->desc.name = no_prng->name; |
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169 return &no_prng->desc; |
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170 } |
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171 |
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172 void no_prng_desc_free(struct ltc_prng_descriptor* prng) |
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173 { |
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174 no_prng_desc_t *no_prng = (no_prng_desc_t*) prng; |
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175 LTC_ARGCHK(no_prng != NULL); |
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176 LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name)); |
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177 XFREE(no_prng); |
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178 } |
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179 |
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180 #endif |
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181 |
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182 |
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183 /* ref: $Format:%D$ */ |
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184 /* git commit: $Format:%H$ */ |
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185 /* commit time: $Format:%ai$ */ |