Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/teletex_string/der_length_teletex_string.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +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 der_length_teletex_string.c
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13 ASN.1 DER, get length of teletex STRING
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14 */
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15
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16 #ifdef LTC_DER
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17
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18 static const struct {
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19 int code, value;
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20 } teletex_table[] = {
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21 { '\0', 0 },
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22 { '\a', 7 },
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23 { '\b', 8 },
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24 { '\t', 9 },
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25 { '\n', 10 },
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26 { '\v', 11 },
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27 { '\f', 12 },
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28 { '\r', 13 },
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29 { ' ', 32 },
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30 { '!', 33 },
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31 { '"', 34 },
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32 { '%', 37 },
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33 { '&', 38 },
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34 { '\'', 39 },
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35 { '(', 40 },
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36 { ')', 41 },
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37 { '+', 43 },
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38 { ',', 44 },
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42 { '0', 48 },
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43 { '1', 49 },
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48 { '6', 54 },
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59 { 'A', 65 },
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60 { 'B', 66 },
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137 { 0xbe, 190 },
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138 { 0xbf, 191 },
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139 };
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140
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141 int der_teletex_char_encode(int c)
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142 {
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143 int x;
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144 for (x = 0; x < (int)(sizeof(teletex_table)/sizeof(teletex_table[0])); x++) {
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145 if (teletex_table[x].code == c) {
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146 return teletex_table[x].value;
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147 }
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148 }
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149 return -1;
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150 }
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151
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152 int der_teletex_value_decode(int v)
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153 {
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154 int x;
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155 for (x = 0; x < (int)(sizeof(teletex_table)/sizeof(teletex_table[0])); x++) {
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156 if (teletex_table[x].value == v) {
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157 return teletex_table[x].code;
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158 }
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159 }
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160 return -1;
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161 }
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162
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163 /**
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164 Gets length of DER encoding of teletex STRING
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165 @param octets The values you want to encode
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166 @param noctets The number of octets in the string to encode
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167 @param outlen [out] The length of the DER encoding for the given string
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168 @return CRYPT_OK if successful
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169 */
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170 int der_length_teletex_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen)
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171 {
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172 unsigned long x;
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173
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174 LTC_ARGCHK(outlen != NULL);
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175 LTC_ARGCHK(octets != NULL);
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176
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177 /* scan string for validity */
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178 for (x = 0; x < noctets; x++) {
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179 if (der_teletex_char_encode(octets[x]) == -1) {
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180 return CRYPT_INVALID_ARG;
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181 }
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182 }
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183
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184 if (noctets < 128) {
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185 /* 16 LL DD DD DD ... */
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186 *outlen = 2 + noctets;
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187 } else if (noctets < 256) {
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188 /* 16 81 LL DD DD DD ... */
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189 *outlen = 3 + noctets;
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190 } else if (noctets < 65536UL) {
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191 /* 16 82 LL LL DD DD DD ... */
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192 *outlen = 4 + noctets;
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193 } else if (noctets < 16777216UL) {
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194 /* 16 83 LL LL LL DD DD DD ... */
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195 *outlen = 5 + noctets;
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196 } else {
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197 return CRYPT_INVALID_ARG;
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198 }
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199
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200 return CRYPT_OK;
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201 }
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202
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203 #endif
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204
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205
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206 /* ref: $Format:%D$ */
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207 /* git commit: $Format:%H$ */
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208 /* commit time: $Format:%ai$ */