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annotate libtomcrypt/tests/no_prng.c @ 1747:ff51d5967e2d

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Avoid passing NULL to memcpy
author Matt Johnston <matt@ucc.asn.au>
date Mon, 19 Oct 2020 21:38:20 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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: $Format:%ai$ */