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annotate libtomcrypt/src/misc/crypt/crypt_constants.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents e9dba7abd939
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 crypt_constants.c
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13
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14 Make various constants available to dynamic languages
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15 like Python - Larry Bugbee, February 2013
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16
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17 LB - Dec 2013 - revised to include compiler define options
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18 LB - Mar 2014 - added endianness and word size
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19 */
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20
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21 typedef struct {
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22 const char *name;
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23 const int value;
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24 } crypt_constant;
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25
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26 #define _C_STRINGIFY(s) { #s, s }
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27
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28 static const crypt_constant _crypt_constants[] = {
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29
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30 _C_STRINGIFY(CRYPT_OK),
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31 _C_STRINGIFY(CRYPT_ERROR),
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32 _C_STRINGIFY(CRYPT_NOP),
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33 _C_STRINGIFY(CRYPT_INVALID_KEYSIZE),
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34 _C_STRINGIFY(CRYPT_INVALID_ROUNDS),
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35 _C_STRINGIFY(CRYPT_FAIL_TESTVECTOR),
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36 _C_STRINGIFY(CRYPT_BUFFER_OVERFLOW),
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37 _C_STRINGIFY(CRYPT_INVALID_PACKET),
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38 _C_STRINGIFY(CRYPT_INVALID_PRNGSIZE),
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39 _C_STRINGIFY(CRYPT_ERROR_READPRNG),
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40 _C_STRINGIFY(CRYPT_INVALID_CIPHER),
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41 _C_STRINGIFY(CRYPT_INVALID_HASH),
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42 _C_STRINGIFY(CRYPT_INVALID_PRNG),
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43 _C_STRINGIFY(CRYPT_MEM),
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44 _C_STRINGIFY(CRYPT_PK_TYPE_MISMATCH),
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45 _C_STRINGIFY(CRYPT_PK_NOT_PRIVATE),
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46 _C_STRINGIFY(CRYPT_INVALID_ARG),
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47 _C_STRINGIFY(CRYPT_FILE_NOTFOUND),
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48 _C_STRINGIFY(CRYPT_PK_INVALID_TYPE),
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49 _C_STRINGIFY(CRYPT_OVERFLOW),
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50 _C_STRINGIFY(CRYPT_UNUSED1),
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51 _C_STRINGIFY(CRYPT_INPUT_TOO_LONG),
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52 _C_STRINGIFY(CRYPT_PK_INVALID_SIZE),
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53 _C_STRINGIFY(CRYPT_INVALID_PRIME_SIZE),
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54 _C_STRINGIFY(CRYPT_PK_INVALID_PADDING),
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55 _C_STRINGIFY(CRYPT_HASH_OVERFLOW),
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56
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57 _C_STRINGIFY(PK_PUBLIC),
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58 _C_STRINGIFY(PK_PRIVATE),
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59
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60 _C_STRINGIFY(LTC_ENCRYPT),
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61 _C_STRINGIFY(LTC_DECRYPT),
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62
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63 #ifdef LTC_PKCS_1
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64 {"LTC_PKCS_1", 1},
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65 /* Block types */
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66 _C_STRINGIFY(LTC_PKCS_1_EMSA),
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67 _C_STRINGIFY(LTC_PKCS_1_EME),
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68
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69 /* Padding types */
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70 _C_STRINGIFY(LTC_PKCS_1_V1_5),
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71 _C_STRINGIFY(LTC_PKCS_1_OAEP),
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72 _C_STRINGIFY(LTC_PKCS_1_PSS),
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73 _C_STRINGIFY(LTC_PKCS_1_V1_5_NA1),
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74 #else
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75 {"LTC_PKCS_1", 0},
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76 #endif
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77
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78 #ifdef LTC_MRSA
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79 {"LTC_MRSA", 1},
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80 #else
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81 {"LTC_MRSA", 0},
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82 #endif
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83
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84 #ifdef LTC_MKAT
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85 {"LTC_MKAT", 1},
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86 _C_STRINGIFY(MIN_KAT_SIZE),
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87 _C_STRINGIFY(MAX_KAT_SIZE),
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88 #else
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89 {"LTC_MKAT", 0},
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90 #endif
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91
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92 #ifdef LTC_MECC
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93 {"LTC_MECC", 1},
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94 _C_STRINGIFY(ECC_BUF_SIZE),
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95 _C_STRINGIFY(ECC_MAXSIZE),
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96 #else
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97 {"LTC_MECC", 0},
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98 #endif
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99
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100 #ifdef LTC_MDSA
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101 {"LTC_MDSA", 1},
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102 _C_STRINGIFY(LTC_MDSA_DELTA),
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103 _C_STRINGIFY(LTC_MDSA_MAX_GROUP),
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104 #else
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105 {"LTC_MDSA", 0},
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106 #endif
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107
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108 #ifdef LTC_MILLER_RABIN_REPS
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109 _C_STRINGIFY(LTC_MILLER_RABIN_REPS),
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110 #endif
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111
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112 #ifdef LTC_DER
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113 /* DER handling */
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114 {"LTC_DER", 1},
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115 _C_STRINGIFY(LTC_ASN1_EOL),
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116 _C_STRINGIFY(LTC_ASN1_BOOLEAN),
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117 _C_STRINGIFY(LTC_ASN1_INTEGER),
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118 _C_STRINGIFY(LTC_ASN1_SHORT_INTEGER),
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119 _C_STRINGIFY(LTC_ASN1_BIT_STRING),
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120 _C_STRINGIFY(LTC_ASN1_OCTET_STRING),
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121 _C_STRINGIFY(LTC_ASN1_NULL),
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122 _C_STRINGIFY(LTC_ASN1_OBJECT_IDENTIFIER),
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123 _C_STRINGIFY(LTC_ASN1_IA5_STRING),
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124 _C_STRINGIFY(LTC_ASN1_PRINTABLE_STRING),
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125 _C_STRINGIFY(LTC_ASN1_UTF8_STRING),
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126 _C_STRINGIFY(LTC_ASN1_UTCTIME),
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127 _C_STRINGIFY(LTC_ASN1_CHOICE),
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128 _C_STRINGIFY(LTC_ASN1_SEQUENCE),
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129 _C_STRINGIFY(LTC_ASN1_SET),
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130 _C_STRINGIFY(LTC_ASN1_SETOF),
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diff changeset
131 _C_STRINGIFY(LTC_ASN1_RAW_BIT_STRING),
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132 _C_STRINGIFY(LTC_ASN1_TELETEX_STRING),
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133 _C_STRINGIFY(LTC_ASN1_CONSTRUCTED),
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134 _C_STRINGIFY(LTC_ASN1_CONTEXT_SPECIFIC),
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135 _C_STRINGIFY(LTC_ASN1_GENERALIZEDTIME),
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136 _C_STRINGIFY(LTC_DER_MAX_RECURSION),
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diff changeset
137 #else
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138 {"LTC_DER", 0},
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139 #endif
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140
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141 #ifdef LTC_CTR_MODE
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diff changeset
142 {"LTC_CTR_MODE", 1},
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143 _C_STRINGIFY(CTR_COUNTER_LITTLE_ENDIAN),
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144 _C_STRINGIFY(CTR_COUNTER_BIG_ENDIAN),
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145 _C_STRINGIFY(LTC_CTR_RFC3686),
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146 #else
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147 {"LTC_CTR_MODE", 0},
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148 #endif
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149 #ifdef LTC_GCM_MODE
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150 _C_STRINGIFY(LTC_GCM_MODE_IV),
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151 _C_STRINGIFY(LTC_GCM_MODE_AAD),
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152 _C_STRINGIFY(LTC_GCM_MODE_TEXT),
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153 #endif
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154
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155 _C_STRINGIFY(LTC_MP_LT),
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156 _C_STRINGIFY(LTC_MP_EQ),
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157 _C_STRINGIFY(LTC_MP_GT),
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158
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159 _C_STRINGIFY(LTC_MP_NO),
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160 _C_STRINGIFY(LTC_MP_YES),
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161
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162 _C_STRINGIFY(MAXBLOCKSIZE),
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163 _C_STRINGIFY(TAB_SIZE),
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164 _C_STRINGIFY(ARGTYPE),
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165
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166 #ifdef LTM_DESC
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167 {"LTM_DESC", 1},
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168 #else
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169 {"LTM_DESC", 0},
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170 #endif
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171 #ifdef TFM_DESC
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172 {"TFM_DESC", 1},
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173 #else
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174 {"TFM_DESC", 0},
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175 #endif
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176 #ifdef GMP_DESC
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177 {"GMP_DESC", 1},
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178 #else
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179 {"GMP_DESC", 0},
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180 #endif
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181
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182 #ifdef LTC_FAST
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183 {"LTC_FAST", 1},
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184 #else
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185 {"LTC_FAST", 0},
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186 #endif
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187
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188 #ifdef LTC_NO_FILE
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189 {"LTC_NO_FILE", 1},
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190 #else
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191 {"LTC_NO_FILE", 0},
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192 #endif
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193
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194 #ifdef ENDIAN_LITTLE
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195 {"ENDIAN_LITTLE", 1},
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196 #else
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197 {"ENDIAN_LITTLE", 0},
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198 #endif
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199
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200 #ifdef ENDIAN_BIG
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201 {"ENDIAN_BIG", 1},
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202 #else
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203 {"ENDIAN_BIG", 0},
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204 #endif
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205
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206 #ifdef ENDIAN_32BITWORD
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207 {"ENDIAN_32BITWORD", 1},
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208 #else
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209 {"ENDIAN_32BITWORD", 0},
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210 #endif
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211
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212 #ifdef ENDIAN_64BITWORD
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213 {"ENDIAN_64BITWORD", 1},
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214 #else
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215 {"ENDIAN_64BITWORD", 0},
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216 #endif
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217
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218 #ifdef ENDIAN_NEUTRAL
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219 {"ENDIAN_NEUTRAL", 1},
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220 #else
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221 {"ENDIAN_NEUTRAL", 0},
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222 #endif
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223 };
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224
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225
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226 /* crypt_get_constant()
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227 * valueout will be the value of the named constant
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228 * return -1 if named item not found
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229 */
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230 int crypt_get_constant(const char* namein, int *valueout) {
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diff changeset
231 int i;
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232 int _crypt_constants_len = sizeof(_crypt_constants) / sizeof(_crypt_constants[0]);
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233 for (i=0; i<_crypt_constants_len; i++) {
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234 if (XSTRCMP(_crypt_constants[i].name, namein) == 0) {
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235 *valueout = _crypt_constants[i].value;
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236 return 0;
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237 }
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238 }
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239 return 1;
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240 }
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241
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242 /* crypt_list_all_constants()
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243 * if names_list is NULL, names_list_size will be the minimum
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244 * number of bytes needed to receive the complete names_list
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245 * if names_list is NOT NULL, names_list must be the addr of
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246 * sufficient memory allocated into which the names_list
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247 * is to be written. Also, the value in names_list_size
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248 * sets the upper bound of the number of characters to be
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249 * written.
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250 * a -1 return value signifies insufficient space made available
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251 */
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252 int crypt_list_all_constants(char *names_list, unsigned int *names_list_size) {
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253 int i;
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254 unsigned int total_len = 0;
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255 char *ptr;
1471
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256 int number_len;
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257 int count = sizeof(_crypt_constants) / sizeof(_crypt_constants[0]);
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258
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259 /* calculate amount of memory required for the list */
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260 for (i=0; i<count; i++) {
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261 number_len = snprintf(NULL, 0, "%s,%d\n", _crypt_constants[i].name, _crypt_constants[i].value);
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262 if (number_len < 0)
1471
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263 return -1;
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264 total_len += number_len;
1471
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265 }
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266
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267 if (names_list == NULL) {
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268 *names_list_size = total_len;
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269 } else {
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270 if (total_len > *names_list_size) {
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271 return -1;
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272 }
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273 /* build the names list */
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274 ptr = names_list;
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275 for (i=0; i<count; i++) {
1711
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276 number_len = snprintf(ptr, total_len, "%s,%d\n", _crypt_constants[i].name, _crypt_constants[i].value);
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277 if (number_len < 0) return -1;
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278 if ((unsigned int)number_len > total_len) return -1;
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279 total_len -= number_len;
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280 ptr += number_len;
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281 }
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282 /* to remove the trailing new-line */
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283 ptr -= 1;
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284 *ptr = 0;
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285 }
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286 return 0;
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287 }
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288
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289
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290 /* ref: $Format:%D$ */
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291 /* git commit: $Format:%H$ */
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292 /* commit time: $Format:%ai$ */