Mercurial > dropbear

annotate libtomcrypt/tests/no_prng.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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: $Format:%ai$ */