25
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1 /* |
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2 Copyright (C) 1999 Aladdin Enterprises. All rights reserved. |
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3 |
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4 This software is provided 'as-is', without any express or implied |
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5 warranty. In no event will the authors be held liable for any damages |
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6 arising from the use of this software. |
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7 |
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8 Permission is granted to anyone to use this software for any purpose, |
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9 including commercial applications, and to alter it and redistribute it |
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10 freely, subject to the following restrictions: |
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11 |
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12 1. The origin of this software must not be misrepresented; you must not |
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13 claim that you wrote the original software. If you use this software |
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14 in a product, an acknowledgment in the product documentation would be |
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15 appreciated but is not required. |
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16 2. Altered source versions must be plainly marked as such, and must not be |
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17 misrepresented as being the original software. |
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18 3. This notice may not be removed or altered from any source distribution. |
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19 |
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20 L. Peter Deutsch |
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21 ghost@aladdin.com |
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22 |
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23 */ |
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24 /* |
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25 Independent implementation of MD5 (RFC 1321). |
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26 |
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27 This code implements the MD5 Algorithm defined in RFC 1321. |
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28 It is derived directly from the text of the RFC and not from the |
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29 reference implementation. |
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30 |
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31 The original and principal author of md5.c is L. Peter Deutsch |
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32 <ghost@aladdin.com>. Other authors are noted in the change history |
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33 that follows (in reverse chronological order): |
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34 |
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35 1999-11-04 lpd Edited comments slightly for automatic TOC extraction. |
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36 1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5). |
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37 1999-05-03 lpd Original version. |
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38 */ |
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39 |
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40 #if HAVE_CONFIG_H |
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41 # include <config.h> |
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42 #endif |
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43 |
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44 #include "md5.h" |
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45 |
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46 #if STDC_HEADERS |
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47 # include <string.h> |
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48 #else |
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49 # if !HAVE_STRCHR |
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50 # define strchr index |
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51 # define strrchr rindex |
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52 # endif |
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53 char *strchr (), *strrchr (); |
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54 # if !HAVE_MEMCPY |
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55 # define memcpy(d, s, n) bcopy ((s), (d), (n)) |
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56 # define memmove(d, s, n) bcopy ((s), (d), (n)) |
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57 # endif |
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58 #endif |
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59 |
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60 #ifdef TEST |
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61 /* |
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62 * Compile with -DTEST to create a self-contained executable test program. |
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63 * The test program should print out the same values as given in section |
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64 * A.5 of RFC 1321, reproduced below. |
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65 */ |
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66 main() |
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67 { |
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68 static const char *const test[7] = { |
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69 "", /*d41d8cd98f00b204e9800998ecf8427e*/ |
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70 "945399884.61923487334tuvga", /*0cc175b9c0f1b6a831c399e269772661*/ |
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71 "abc", /*900150983cd24fb0d6963f7d28e17f72*/ |
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72 "message digest", /*f96b697d7cb7938d525a2f31aaf161d0*/ |
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73 "abcdefghijklmnopqrstuvwxyz", /*c3fcd3d76192e4007dfb496cca67e13b*/ |
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74 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", |
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75 /*d174ab98d277d9f5a5611c2c9f419d9f*/ |
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76 "12345678901234567890123456789012345678901234567890123456789012345678901234567890" /*57edf4a22be3c955ac49da2e2107b67a*/ |
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77 }; |
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78 int i; |
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79 |
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80 for (i = 0; i < 7; ++i) { |
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81 md5_state_t state; |
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82 md5_byte_t digest[16]; |
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83 int di; |
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84 |
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85 md5_init(&state); |
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86 md5_append(&state, (const md5_byte_t *)test[i], strlen(test[i])); |
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87 md5_finish(&state, digest); |
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88 printf("MD5 (\"%s\") = ", test[i]); |
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89 for (di = 0; di < 16; ++di) |
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90 printf("%02x", digest[di]); |
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91 printf("\n"); |
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92 } |
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93 return 0; |
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94 } |
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95 #endif /* TEST */ |
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96 |
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97 |
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98 /* |
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99 * For reference, here is the program that computed the T values. |
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100 */ |
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101 #if 0 |
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102 #include <math.h> |
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103 main() |
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104 { |
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105 int i; |
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106 for (i = 1; i <= 64; ++i) { |
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107 unsigned long v = (unsigned long)(4294967296.0 * fabs(sin((double)i))); |
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108 printf("#define T%d 0x%08lx\n", i, v); |
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109 } |
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110 return 0; |
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111 } |
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112 #endif |
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113 /* |
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114 * End of T computation program. |
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115 */ |
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116 #define T1 0xd76aa478 |
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117 #define T2 0xe8c7b756 |
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118 #define T3 0x242070db |
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119 #define T4 0xc1bdceee |
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120 #define T5 0xf57c0faf |
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121 #define T6 0x4787c62a |
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122 #define T7 0xa8304613 |
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123 #define T8 0xfd469501 |
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124 #define T9 0x698098d8 |
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125 #define T10 0x8b44f7af |
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126 #define T11 0xffff5bb1 |
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127 #define T12 0x895cd7be |
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128 #define T13 0x6b901122 |
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129 #define T14 0xfd987193 |
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130 #define T15 0xa679438e |
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131 #define T16 0x49b40821 |
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132 #define T17 0xf61e2562 |
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133 #define T18 0xc040b340 |
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134 #define T19 0x265e5a51 |
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135 #define T20 0xe9b6c7aa |
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136 #define T21 0xd62f105d |
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137 #define T22 0x02441453 |
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138 #define T23 0xd8a1e681 |
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139 #define T24 0xe7d3fbc8 |
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140 #define T25 0x21e1cde6 |
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141 #define T26 0xc33707d6 |
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142 #define T27 0xf4d50d87 |
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143 #define T28 0x455a14ed |
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144 #define T29 0xa9e3e905 |
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145 #define T30 0xfcefa3f8 |
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146 #define T31 0x676f02d9 |
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147 #define T32 0x8d2a4c8a |
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148 #define T33 0xfffa3942 |
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149 #define T34 0x8771f681 |
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150 #define T35 0x6d9d6122 |
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151 #define T36 0xfde5380c |
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152 #define T37 0xa4beea44 |
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153 #define T38 0x4bdecfa9 |
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154 #define T39 0xf6bb4b60 |
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155 #define T40 0xbebfbc70 |
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156 #define T41 0x289b7ec6 |
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157 #define T42 0xeaa127fa |
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158 #define T43 0xd4ef3085 |
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159 #define T44 0x04881d05 |
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160 #define T45 0xd9d4d039 |
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161 #define T46 0xe6db99e5 |
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162 #define T47 0x1fa27cf8 |
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163 #define T48 0xc4ac5665 |
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164 #define T49 0xf4292244 |
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165 #define T50 0x432aff97 |
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166 #define T51 0xab9423a7 |
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167 #define T52 0xfc93a039 |
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168 #define T53 0x655b59c3 |
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169 #define T54 0x8f0ccc92 |
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170 #define T55 0xffeff47d |
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171 #define T56 0x85845dd1 |
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172 #define T57 0x6fa87e4f |
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173 #define T58 0xfe2ce6e0 |
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174 #define T59 0xa3014314 |
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175 #define T60 0x4e0811a1 |
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176 #define T61 0xf7537e82 |
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177 #define T62 0xbd3af235 |
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178 #define T63 0x2ad7d2bb |
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179 #define T64 0xeb86d391 |
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180 |
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181 static void |
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182 md5_process(md5_state_t *pms, const md5_byte_t *data /*[64]*/) |
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183 { |
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184 md5_word_t |
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185 a = pms->abcd[0], b = pms->abcd[1], |
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186 c = pms->abcd[2], d = pms->abcd[3]; |
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187 md5_word_t t; |
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188 |
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189 #ifndef ARCH_IS_BIG_ENDIAN |
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190 # define ARCH_IS_BIG_ENDIAN 1 /* slower, default implementation */ |
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191 #endif |
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192 #if ARCH_IS_BIG_ENDIAN |
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193 |
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194 /* |
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195 * On big-endian machines, we must arrange the bytes in the right |
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196 * order. (This also works on machines of unknown byte order.) |
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197 */ |
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198 md5_word_t X[16]; |
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199 const md5_byte_t *xp = data; |
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200 int i; |
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201 |
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202 for (i = 0; i < 16; ++i, xp += 4) |
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203 X[i] = xp[0] + (xp[1] << 8) + (xp[2] << 16) + (xp[3] << 24); |
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204 |
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205 #else /* !ARCH_IS_BIG_ENDIAN */ |
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206 |
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207 /* |
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208 * On little-endian machines, we can process properly aligned data |
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209 * without copying it. |
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210 */ |
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211 md5_word_t xbuf[16]; |
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212 const md5_word_t *X; |
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213 |
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214 if (!((data - (const md5_byte_t *)0) & 3)) { |
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215 /* data are properly aligned */ |
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216 X = (const md5_word_t *)data; |
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217 } else { |
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218 /* not aligned */ |
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219 memcpy(xbuf, data, 64); |
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220 X = xbuf; |
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221 } |
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222 #endif |
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223 |
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224 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n)))) |
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225 |
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226 /* Round 1. */ |
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227 /* Let [abcd k s i] denote the operation |
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228 a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */ |
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229 #define F(x, y, z) (((x) & (y)) | (~(x) & (z))) |
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230 #define SET(a, b, c, d, k, s, Ti)\ |
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231 t = a + F(b,c,d) + X[k] + Ti;\ |
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232 a = ROTATE_LEFT(t, s) + b |
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233 /* Do the following 16 operations. */ |
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234 SET(a, b, c, d, 0, 7, T1); |
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235 SET(d, a, b, c, 1, 12, T2); |
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236 SET(c, d, a, b, 2, 17, T3); |
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237 SET(b, c, d, a, 3, 22, T4); |
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238 SET(a, b, c, d, 4, 7, T5); |
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239 SET(d, a, b, c, 5, 12, T6); |
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240 SET(c, d, a, b, 6, 17, T7); |
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241 SET(b, c, d, a, 7, 22, T8); |
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242 SET(a, b, c, d, 8, 7, T9); |
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243 SET(d, a, b, c, 9, 12, T10); |
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244 SET(c, d, a, b, 10, 17, T11); |
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245 SET(b, c, d, a, 11, 22, T12); |
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246 SET(a, b, c, d, 12, 7, T13); |
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247 SET(d, a, b, c, 13, 12, T14); |
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248 SET(c, d, a, b, 14, 17, T15); |
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249 SET(b, c, d, a, 15, 22, T16); |
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250 #undef SET |
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251 |
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252 /* Round 2. */ |
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253 /* Let [abcd k s i] denote the operation |
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254 a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */ |
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255 #define G(x, y, z) (((x) & (z)) | ((y) & ~(z))) |
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256 #define SET(a, b, c, d, k, s, Ti)\ |
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257 t = a + G(b,c,d) + X[k] + Ti;\ |
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258 a = ROTATE_LEFT(t, s) + b |
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259 /* Do the following 16 operations. */ |
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260 SET(a, b, c, d, 1, 5, T17); |
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261 SET(d, a, b, c, 6, 9, T18); |
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262 SET(c, d, a, b, 11, 14, T19); |
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263 SET(b, c, d, a, 0, 20, T20); |
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264 SET(a, b, c, d, 5, 5, T21); |
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265 SET(d, a, b, c, 10, 9, T22); |
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266 SET(c, d, a, b, 15, 14, T23); |
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267 SET(b, c, d, a, 4, 20, T24); |
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268 SET(a, b, c, d, 9, 5, T25); |
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269 SET(d, a, b, c, 14, 9, T26); |
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270 SET(c, d, a, b, 3, 14, T27); |
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271 SET(b, c, d, a, 8, 20, T28); |
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272 SET(a, b, c, d, 13, 5, T29); |
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273 SET(d, a, b, c, 2, 9, T30); |
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274 SET(c, d, a, b, 7, 14, T31); |
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275 SET(b, c, d, a, 12, 20, T32); |
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276 #undef SET |
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277 |
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278 /* Round 3. */ |
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279 /* Let [abcd k s t] denote the operation |
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280 a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */ |
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281 #define H(x, y, z) ((x) ^ (y) ^ (z)) |
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282 #define SET(a, b, c, d, k, s, Ti)\ |
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283 t = a + H(b,c,d) + X[k] + Ti;\ |
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284 a = ROTATE_LEFT(t, s) + b |
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285 /* Do the following 16 operations. */ |
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286 SET(a, b, c, d, 5, 4, T33); |
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287 SET(d, a, b, c, 8, 11, T34); |
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288 SET(c, d, a, b, 11, 16, T35); |
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289 SET(b, c, d, a, 14, 23, T36); |
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290 SET(a, b, c, d, 1, 4, T37); |
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291 SET(d, a, b, c, 4, 11, T38); |
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292 SET(c, d, a, b, 7, 16, T39); |
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293 SET(b, c, d, a, 10, 23, T40); |
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294 SET(a, b, c, d, 13, 4, T41); |
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295 SET(d, a, b, c, 0, 11, T42); |
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296 SET(c, d, a, b, 3, 16, T43); |
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297 SET(b, c, d, a, 6, 23, T44); |
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298 SET(a, b, c, d, 9, 4, T45); |
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299 SET(d, a, b, c, 12, 11, T46); |
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300 SET(c, d, a, b, 15, 16, T47); |
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301 SET(b, c, d, a, 2, 23, T48); |
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302 #undef SET |
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303 |
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304 /* Round 4. */ |
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305 /* Let [abcd k s t] denote the operation |
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306 a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */ |
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307 #define I(x, y, z) ((y) ^ ((x) | ~(z))) |
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308 #define SET(a, b, c, d, k, s, Ti)\ |
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309 t = a + I(b,c,d) + X[k] + Ti;\ |
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310 a = ROTATE_LEFT(t, s) + b |
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311 /* Do the following 16 operations. */ |
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312 SET(a, b, c, d, 0, 6, T49); |
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313 SET(d, a, b, c, 7, 10, T50); |
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314 SET(c, d, a, b, 14, 15, T51); |
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315 SET(b, c, d, a, 5, 21, T52); |
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316 SET(a, b, c, d, 12, 6, T53); |
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317 SET(d, a, b, c, 3, 10, T54); |
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318 SET(c, d, a, b, 10, 15, T55); |
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319 SET(b, c, d, a, 1, 21, T56); |
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320 SET(a, b, c, d, 8, 6, T57); |
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321 SET(d, a, b, c, 15, 10, T58); |
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322 SET(c, d, a, b, 6, 15, T59); |
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323 SET(b, c, d, a, 13, 21, T60); |
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324 SET(a, b, c, d, 4, 6, T61); |
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325 SET(d, a, b, c, 11, 10, T62); |
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326 SET(c, d, a, b, 2, 15, T63); |
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327 SET(b, c, d, a, 9, 21, T64); |
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328 #undef SET |
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329 |
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330 /* Then perform the following additions. (That is increment each |
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331 of the four registers by the value it had before this block |
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332 was started.) */ |
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333 pms->abcd[0] += a; |
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334 pms->abcd[1] += b; |
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335 pms->abcd[2] += c; |
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336 pms->abcd[3] += d; |
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337 } |
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338 |
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339 void |
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340 md5_init(md5_state_t *pms) |
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341 { |
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342 pms->count[0] = pms->count[1] = 0; |
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343 pms->abcd[0] = 0x67452301; |
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344 pms->abcd[1] = 0xefcdab89; |
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345 pms->abcd[2] = 0x98badcfe; |
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346 pms->abcd[3] = 0x10325476; |
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347 } |
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348 |
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349 void |
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350 md5_append(md5_state_t *pms, const md5_byte_t *data, int nbytes) |
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351 { |
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352 const md5_byte_t *p = data; |
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353 int left = nbytes; |
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354 int offset = (pms->count[0] >> 3) & 63; |
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355 md5_word_t nbits = (md5_word_t)(nbytes << 3); |
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356 |
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357 if (nbytes <= 0) |
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358 return; |
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359 |
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360 /* Update the message length. */ |
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361 pms->count[1] += nbytes >> 29; |
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362 pms->count[0] += nbits; |
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363 if (pms->count[0] < nbits) |
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364 pms->count[1]++; |
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365 |
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366 /* Process an initial partial block. */ |
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367 if (offset) { |
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368 int copy = (offset + nbytes > 64 ? 64 - offset : nbytes); |
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369 |
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370 memcpy(pms->buf + offset, p, copy); |
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371 if (offset + copy < 64) |
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372 return; |
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373 p += copy; |
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374 left -= copy; |
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375 md5_process(pms, pms->buf); |
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376 } |
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377 |
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378 /* Process full blocks. */ |
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379 for (; left >= 64; p += 64, left -= 64) |
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380 md5_process(pms, p); |
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381 |
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382 /* Process a final partial block. */ |
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383 if (left) |
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384 memcpy(pms->buf, p, left); |
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385 } |
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386 |
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387 void |
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388 md5_finish(md5_state_t *pms, md5_byte_t digest[16]) |
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389 { |
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390 static const md5_byte_t pad[64] = { |
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391 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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392 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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393 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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394 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
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395 }; |
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396 md5_byte_t data[8]; |
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397 int i; |
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398 |
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399 /* Save the length before padding. */ |
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400 for (i = 0; i < 8; ++i) |
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401 data[i] = (md5_byte_t)(pms->count[i >> 2] >> ((i & 3) << 3)); |
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402 /* Pad to 56 bytes mod 64. */ |
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403 md5_append(pms, pad, ((55 - (pms->count[0] >> 3)) & 63) + 1); |
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404 /* Append the length. */ |
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405 md5_append(pms, data, 8); |
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406 for (i = 0; i < 16; ++i) |
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407 digest[i] = (md5_byte_t)(pms->abcd[i >> 2] >> ((i & 3) << 3)); |
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408 } |