Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.c @ 994:5c5ade336926
Prefer stronger algorithms in algorithm negotiation.
Prefer diffie-hellman-group14-sha1 (2048 bit) over
diffie-hellman-group1-sha1 (1024 bit).
Due to meet-in-the-middle attacks the effective key length of
three key 3DES is 112 bits. AES is stronger and faster then 3DES.
Prefer to delay the start of compression until after authentication
has completed. This avoids exposing compression code to attacks
from unauthenticated users.
(github pull request #9)
author | Fedor Brunner <fedor.brunner@azet.sk> |
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date | Fri, 23 Jan 2015 23:00:25 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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 * |
382
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9 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file der_length_printable_string.c |
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15 ASN.1 DER, get length of Printable STRING, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef LTC_DER |
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19 |
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20 static const struct { |
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21 int code, value; |
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22 } printable_table[] = { |
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23 { ' ', 32 }, |
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24 { '\'', 39 }, |
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25 { '(', 40 }, |
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26 { ')', 41 }, |
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27 { '+', 43 }, |
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28 { ',', 44 }, |
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29 { '-', 45 }, |
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30 { '.', 46 }, |
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32 { '0', 48 }, |
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33 { '1', 49 }, |
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34 { '2', 50 }, |
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35 { '3', 51 }, |
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38 { '6', 54 }, |
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42 { ':', 58 }, |
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47 { 'C', 67 }, |
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48 { 'D', 68 }, |
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50 { 'F', 70 }, |
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51 { 'G', 71 }, |
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52 { 'H', 72 }, |
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82 { 'l', 108 }, |
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83 { 'm', 109 }, |
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84 { 'n', 110 }, |
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85 { 'o', 111 }, |
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86 { 'p', 112 }, |
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87 { 'q', 113 }, |
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88 { 'r', 114 }, |
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89 { 's', 115 }, |
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90 { 't', 116 }, |
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91 { 'u', 117 }, |
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92 { 'v', 118 }, |
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93 { 'w', 119 }, |
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94 { 'x', 120 }, |
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95 { 'y', 121 }, |
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96 { 'z', 122 }, |
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97 }; |
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98 |
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99 int der_printable_char_encode(int c) |
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100 { |
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101 int x; |
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102 for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) { |
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103 if (printable_table[x].code == c) { |
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104 return printable_table[x].value; |
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105 } |
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106 } |
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107 return -1; |
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108 } |
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109 |
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110 int der_printable_value_decode(int v) |
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111 { |
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112 int x; |
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113 for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) { |
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114 if (printable_table[x].value == v) { |
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115 return printable_table[x].code; |
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116 } |
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117 } |
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118 return -1; |
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119 } |
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120 |
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121 /** |
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122 Gets length of DER encoding of Printable STRING |
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123 @param octets The values you want to encode |
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124 @param noctets The number of octets in the string to encode |
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125 @param outlen [out] The length of the DER encoding for the given string |
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126 @return CRYPT_OK if successful |
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127 */ |
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128 int der_length_printable_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen) |
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129 { |
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130 unsigned long x; |
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131 |
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132 LTC_ARGCHK(outlen != NULL); |
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133 LTC_ARGCHK(octets != NULL); |
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134 |
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135 /* scan string for validity */ |
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136 for (x = 0; x < noctets; x++) { |
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137 if (der_printable_char_encode(octets[x]) == -1) { |
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138 return CRYPT_INVALID_ARG; |
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139 } |
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140 } |
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141 |
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142 if (noctets < 128) { |
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143 /* 16 LL DD DD DD ... */ |
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144 *outlen = 2 + noctets; |
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145 } else if (noctets < 256) { |
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146 /* 16 81 LL DD DD DD ... */ |
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147 *outlen = 3 + noctets; |
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148 } else if (noctets < 65536UL) { |
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149 /* 16 82 LL LL DD DD DD ... */ |
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150 *outlen = 4 + noctets; |
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151 } else if (noctets < 16777216UL) { |
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152 /* 16 83 LL LL LL DD DD DD ... */ |
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153 *outlen = 5 + noctets; |
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154 } else { |
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155 return CRYPT_INVALID_ARG; |
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156 } |
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157 |
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158 return CRYPT_OK; |
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159 } |
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160 |
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161 #endif |
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162 |
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163 |
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164 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.c,v $ */ |
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165 /* $Revision: 1.2 $ */ |
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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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166 /* $Date: 2006/03/31 14:15:35 $ */ |