1 | /* |
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2 | * SHA1 hashing code copied from Lepton's crack <http://usuarios.lycos.es/reinob/> |
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3 | * |
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4 | * Adapted to be API-compatible with the previous (GPL-incompatible) code. |
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5 | */ |
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6 | |
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7 | /* |
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8 | * sha1.c |
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9 | * |
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10 | * Description: |
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11 | * This file implements the Secure Hashing Algorithm 1 as |
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12 | * defined in FIPS PUB 180-1 published April 17, 1995. |
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13 | * |
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14 | * The SHA-1, produces a 160-bit message digest for a given |
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15 | * data stream. It should take about 2**n steps to find a |
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16 | * message with the same digest as a given message and |
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17 | * 2**(n/2) to find any two messages with the same digest, |
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18 | * when n is the digest size in bits. Therefore, this |
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19 | * algorithm can serve as a means of providing a |
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20 | * "fingerprint" for a message. |
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21 | * |
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22 | * Portability Issues: |
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23 | * SHA-1 is defined in terms of 32-bit "words". This code |
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24 | * uses <stdint.h> (included via "sha1.h" to define 32 and 8 |
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25 | * bit unsigned integer types. If your C compiler does not |
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26 | * support 32 bit unsigned integers, this code is not |
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27 | * appropriate. |
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28 | * |
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29 | * Caveats: |
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30 | * SHA-1 is designed to work with messages less than 2^64 bits |
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31 | * long. Although SHA-1 allows a message digest to be generated |
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32 | * for messages of any number of bits less than 2^64, this |
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33 | * implementation only works with messages with a length that is |
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34 | * a multiple of the size of an 8-bit character. |
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35 | * |
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36 | */ |
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37 | |
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38 | #include <string.h> |
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39 | #include "sha1.h" |
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40 | |
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41 | /* |
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42 | * Define the SHA1 circular left shift macro |
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43 | */ |
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44 | #define SHA1CircularShift(bits,word) \ |
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45 | (((word) << (bits)) | ((word) >> (32-(bits)))) |
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46 | |
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47 | /* Local Function Prototyptes */ |
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48 | static void sha1_pad(sha1_state_t *); |
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49 | static void sha1_process_block(sha1_state_t *); |
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50 | |
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51 | /* |
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52 | * sha1_init |
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53 | * |
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54 | * Description: |
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55 | * This function will initialize the sha1_state_t in preparation |
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56 | * for computing a new SHA1 message digest. |
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57 | * |
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58 | * Parameters: |
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59 | * context: [in/out] |
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60 | * The context to reset. |
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61 | * |
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62 | * Returns: |
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63 | * sha Error Code. |
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64 | * |
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65 | */ |
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66 | int sha1_init(sha1_state_t * context) |
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67 | { |
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68 | context->Length_Low = 0; |
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69 | context->Length_High = 0; |
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70 | context->Message_Block_Index = 0; |
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71 | |
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72 | context->Intermediate_Hash[0] = 0x67452301; |
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73 | context->Intermediate_Hash[1] = 0xEFCDAB89; |
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74 | context->Intermediate_Hash[2] = 0x98BADCFE; |
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75 | context->Intermediate_Hash[3] = 0x10325476; |
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76 | context->Intermediate_Hash[4] = 0xC3D2E1F0; |
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77 | |
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78 | context->Computed = 0; |
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79 | context->Corrupted = 0; |
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80 | |
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81 | return shaSuccess; |
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82 | } |
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83 | |
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84 | /* |
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85 | * sha1_finish |
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86 | * |
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87 | * Description: |
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88 | * This function will return the 160-bit message digest into the |
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89 | * Message_Digest array provided by the caller. |
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90 | * NOTE: The first octet of hash is stored in the 0th element, |
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91 | * the last octet of hash in the 19th element. |
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92 | * |
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93 | * Parameters: |
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94 | * context: [in/out] |
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95 | * The context to use to calculate the SHA-1 hash. |
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96 | * Message_Digest: [out] |
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97 | * Where the digest is returned. |
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98 | * |
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99 | * Returns: |
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100 | * sha Error Code. |
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101 | * |
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102 | */ |
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103 | int sha1_finish(sha1_state_t * context, uint8_t Message_Digest[sha1_hash_size]) |
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104 | { |
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105 | int i; |
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106 | |
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107 | if (!context || !Message_Digest) { |
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108 | return shaNull; |
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109 | } |
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110 | |
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111 | if (context->Corrupted) { |
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112 | return context->Corrupted; |
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113 | } |
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114 | |
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115 | if (!context->Computed) { |
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116 | sha1_pad(context); |
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117 | for (i = 0; i < 64; ++i) { |
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118 | /* message may be sensitive, clear it out */ |
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119 | context->Message_Block[i] = 0; |
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120 | } |
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121 | context->Length_Low = 0; /* and clear length */ |
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122 | context->Length_High = 0; |
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123 | context->Computed = 1; |
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124 | |
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125 | } |
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126 | |
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127 | for (i = 0; i < sha1_hash_size; ++i) { |
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128 | Message_Digest[i] = context->Intermediate_Hash[i >> 2] |
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129 | >> 8 * (3 - (i & 0x03)); |
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130 | } |
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131 | |
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132 | return shaSuccess; |
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133 | } |
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134 | |
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135 | /* |
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136 | * sha1_append |
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137 | * |
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138 | * Description: |
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139 | * This function accepts an array of octets as the next portion |
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140 | * of the message. |
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141 | * |
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142 | * Parameters: |
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143 | * context: [in/out] |
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144 | * The SHA context to update |
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145 | * message_array: [in] |
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146 | * An array of characters representing the next portion of |
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147 | * the message. |
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148 | * length: [in] |
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149 | * The length of the message in message_array |
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150 | * |
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151 | * Returns: |
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152 | * sha Error Code. |
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153 | * |
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154 | */ |
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155 | int |
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156 | sha1_append(sha1_state_t * context, |
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157 | const uint8_t * message_array, unsigned length) |
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158 | { |
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159 | if (!length) { |
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160 | return shaSuccess; |
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161 | } |
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162 | |
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163 | if (!context || !message_array) { |
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164 | return shaNull; |
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165 | } |
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166 | |
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167 | if (context->Computed) { |
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168 | context->Corrupted = shaStateError; |
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169 | |
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170 | return shaStateError; |
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171 | } |
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172 | |
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173 | if (context->Corrupted) { |
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174 | return context->Corrupted; |
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175 | } |
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176 | while (length-- && !context->Corrupted) { |
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177 | context->Message_Block[context->Message_Block_Index++] = |
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178 | (*message_array & 0xFF); |
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179 | |
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180 | context->Length_Low += 8; |
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181 | if (context->Length_Low == 0) { |
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182 | context->Length_High++; |
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183 | if (context->Length_High == 0) { |
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184 | /* Message is too long */ |
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185 | context->Corrupted = 1; |
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186 | } |
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187 | } |
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188 | |
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189 | if (context->Message_Block_Index == 64) { |
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190 | sha1_process_block(context); |
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191 | } |
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192 | |
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193 | message_array++; |
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194 | } |
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195 | |
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196 | return shaSuccess; |
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197 | } |
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198 | |
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199 | /* |
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200 | * sha1_process_block |
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201 | * |
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202 | * Description: |
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203 | * This function will process the next 512 bits of the message |
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204 | * stored in the Message_Block array. |
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205 | * |
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206 | * Parameters: |
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207 | * None. |
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208 | * |
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209 | * Returns: |
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210 | * Nothing. |
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211 | * |
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212 | * Comments: |
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213 | * Many of the variable names in this code, especially the |
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214 | * single character names, were used because those were the |
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215 | * names used in the publication. |
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216 | * |
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217 | * |
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218 | */ |
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219 | static void sha1_process_block(sha1_state_t * context) |
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220 | { |
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221 | const uint32_t K[] = { /* Constants defined in SHA-1 */ |
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222 | 0x5A827999, |
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223 | 0x6ED9EBA1, |
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224 | 0x8F1BBCDC, |
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225 | 0xCA62C1D6 |
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226 | }; |
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227 | int t; /* Loop counter */ |
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228 | uint32_t temp; /* Temporary word value */ |
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229 | uint32_t W[80]; /* Word sequence */ |
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230 | uint32_t A, B, C, D, E; /* Word buffers */ |
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231 | |
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232 | /* |
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233 | * Initialize the first 16 words in the array W |
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234 | */ |
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235 | for (t = 0; t < 16; t++) { |
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236 | W[t] = context->Message_Block[t * 4] << 24; |
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237 | W[t] |= context->Message_Block[t * 4 + 1] << 16; |
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238 | W[t] |= context->Message_Block[t * 4 + 2] << 8; |
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239 | W[t] |= context->Message_Block[t * 4 + 3]; |
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240 | } |
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241 | |
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242 | for (t = 16; t < 80; t++) { |
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243 | W[t] = |
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244 | SHA1CircularShift(1, |
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245 | W[t - 3] ^ W[t - 8] ^ W[t - |
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246 | 14] ^ W[t - |
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247 | 16]); |
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248 | } |
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249 | |
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250 | A = context->Intermediate_Hash[0]; |
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251 | B = context->Intermediate_Hash[1]; |
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252 | C = context->Intermediate_Hash[2]; |
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253 | D = context->Intermediate_Hash[3]; |
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254 | E = context->Intermediate_Hash[4]; |
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255 | |
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256 | for (t = 0; t < 20; t++) { |
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257 | temp = SHA1CircularShift(5, A) + |
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258 | ((B & C) | ((~B) & D)) + E + W[t] + K[0]; |
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259 | E = D; |
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260 | D = C; |
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261 | C = SHA1CircularShift(30, B); |
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262 | |
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263 | B = A; |
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264 | A = temp; |
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265 | } |
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266 | |
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267 | for (t = 20; t < 40; t++) { |
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268 | temp = |
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269 | SHA1CircularShift(5, |
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270 | A) + (B ^ C ^ D) + E + W[t] + K[1]; |
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271 | E = D; |
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272 | D = C; |
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273 | C = SHA1CircularShift(30, B); |
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274 | B = A; |
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275 | A = temp; |
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276 | } |
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277 | |
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278 | for (t = 40; t < 60; t++) { |
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279 | temp = SHA1CircularShift(5, A) + |
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280 | ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2]; |
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281 | E = D; |
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282 | D = C; |
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283 | C = SHA1CircularShift(30, B); |
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284 | B = A; |
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285 | A = temp; |
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286 | } |
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287 | |
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288 | for (t = 60; t < 80; t++) { |
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289 | temp = |
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290 | SHA1CircularShift(5, |
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291 | A) + (B ^ C ^ D) + E + W[t] + K[3]; |
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292 | E = D; |
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293 | D = C; |
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294 | C = SHA1CircularShift(30, B); |
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295 | B = A; |
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296 | A = temp; |
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297 | } |
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298 | |
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299 | context->Intermediate_Hash[0] += A; |
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300 | context->Intermediate_Hash[1] += B; |
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301 | context->Intermediate_Hash[2] += C; |
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302 | context->Intermediate_Hash[3] += D; |
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303 | context->Intermediate_Hash[4] += E; |
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304 | |
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305 | context->Message_Block_Index = 0; |
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306 | } |
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307 | |
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308 | /* |
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309 | * sha1_pad |
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310 | * |
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311 | * Description: |
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312 | * According to the standard, the message must be padded to an even |
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313 | * 512 bits. The first padding bit must be a '1'. The last 64 |
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314 | * bits represent the length of the original message. All bits in |
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315 | * between should be 0. This function will pad the message |
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316 | * according to those rules by filling the Message_Block array |
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317 | * accordingly. It will also call the ProcessMessageBlock function |
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318 | * provided appropriately. When it returns, it can be assumed that |
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319 | * the message digest has been computed. |
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320 | * |
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321 | * Parameters: |
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322 | * context: [in/out] |
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323 | * The context to pad |
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324 | * ProcessMessageBlock: [in] |
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325 | * The appropriate SHA*ProcessMessageBlock function |
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326 | * Returns: |
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327 | * Nothing. |
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328 | * |
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329 | */ |
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330 | |
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331 | static void sha1_pad(sha1_state_t * context) |
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332 | { |
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333 | /* |
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334 | * Check to see if the current message block is too small to hold |
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335 | * the initial padding bits and length. If so, we will pad the |
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336 | * block, process it, and then continue padding into a second |
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337 | * block. |
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338 | */ |
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339 | if (context->Message_Block_Index > 55) { |
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340 | context->Message_Block[context->Message_Block_Index++] = |
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341 | 0x80; |
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342 | while (context->Message_Block_Index < 64) { |
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343 | context->Message_Block[context-> |
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344 | Message_Block_Index++] = 0; |
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345 | } |
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346 | |
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347 | sha1_process_block(context); |
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348 | |
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349 | while (context->Message_Block_Index < 56) { |
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350 | context->Message_Block[context-> |
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351 | Message_Block_Index++] = 0; |
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352 | } |
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353 | } else { |
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354 | context->Message_Block[context->Message_Block_Index++] = |
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355 | 0x80; |
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356 | while (context->Message_Block_Index < 56) { |
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357 | |
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358 | context->Message_Block[context-> |
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359 | Message_Block_Index++] = 0; |
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360 | } |
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361 | } |
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362 | |
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363 | /* |
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364 | * Store the message length as the last 8 octets |
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365 | */ |
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366 | context->Message_Block[56] = context->Length_High >> 24; |
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367 | context->Message_Block[57] = context->Length_High >> 16; |
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368 | context->Message_Block[58] = context->Length_High >> 8; |
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369 | context->Message_Block[59] = context->Length_High; |
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370 | context->Message_Block[60] = context->Length_Low >> 24; |
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371 | context->Message_Block[61] = context->Length_Low >> 16; |
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372 | context->Message_Block[62] = context->Length_Low >> 8; |
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373 | context->Message_Block[63] = context->Length_Low; |
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374 | |
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375 | sha1_process_block(context); |
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376 | } |
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377 | |
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378 | #define HMAC_BLOCK_SIZE 64 |
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379 | |
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380 | /* BitlBee addition: */ |
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381 | void sha1_hmac(const char *key_, size_t key_len, const char *payload, size_t payload_len, uint8_t Message_Digest[sha1_hash_size]) |
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382 | { |
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383 | sha1_state_t sha1; |
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384 | uint8_t hash[sha1_hash_size]; |
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385 | uint8_t key[HMAC_BLOCK_SIZE+1]; |
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386 | int i; |
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387 | |
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388 | if( key_len == 0 ) |
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389 | key_len = strlen( key_ ); |
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390 | if( payload_len == 0 ) |
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391 | payload_len = strlen( payload ); |
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392 | |
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393 | /* Create K. If our current key is >64 chars we have to hash it, |
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394 | otherwise just pad. */ |
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395 | memset( key, 0, HMAC_BLOCK_SIZE + 1 ); |
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396 | if( key_len > HMAC_BLOCK_SIZE ) |
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397 | { |
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398 | sha1_init( &sha1 ); |
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399 | sha1_append( &sha1, (uint8_t*) key_, key_len ); |
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400 | sha1_finish( &sha1, key ); |
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401 | } |
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402 | else |
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403 | { |
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404 | memcpy( key, key_, key_len ); |
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405 | } |
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406 | |
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407 | /* Inner part: H(K XOR 0x36, text) */ |
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408 | sha1_init( &sha1 ); |
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409 | for( i = 0; i < HMAC_BLOCK_SIZE; i ++ ) |
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410 | key[i] ^= 0x36; |
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411 | sha1_append( &sha1, key, HMAC_BLOCK_SIZE ); |
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412 | sha1_append( &sha1, (const uint8_t*) payload, payload_len ); |
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413 | sha1_finish( &sha1, hash ); |
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414 | |
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415 | /* Final result: H(K XOR 0x5C, inner stuff) */ |
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416 | sha1_init( &sha1 ); |
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417 | for( i = 0; i < HMAC_BLOCK_SIZE; i ++ ) |
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418 | key[i] ^= 0x36 ^ 0x5c; |
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419 | sha1_append( &sha1, key, HMAC_BLOCK_SIZE ); |
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420 | sha1_append( &sha1, hash, sha1_hash_size ); |
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421 | sha1_finish( &sha1, Message_Digest ); |
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422 | } |
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