Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/teletex_string/der_length_teletex_string.c @ 1928:333688ec53d0

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Handle ecdsa-sk flags, reject no-touch For the time being Dropbear will only allow SK auth with default parameters, user-presence needs to be set. In future handling of authorized_keys option "no-touch-required" can be added. This code would also be refactored to share between ecdsa and ed25519 once I get hardware/emulation to test ed25519.
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Mar 2022 21:06:15 +0800
parents 6dba84798cd5
children
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rev   line source
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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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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: $Format:%ai$ */