Mercurial > cpython-lru_cache-weakref

annotate Modules/md5module.c @ 70817:dd775b1561ba

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Fix markup.
author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
parents 3bf4d9f1660a
children 43fd627cc060
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1 /* MD5 module */
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2
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3 /* This module provides an interface to the MD5 algorithm */
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4
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5 /* See below for information about the original code this module was
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6 based upon. Additional work performed by:
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7
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8 Andrew Kuchling (amk@amk.ca)
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9 Greg Stein (gstein@lyra.org)
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10 Trevor Perrin (trevp@trevp.net)
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11
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12 Copyright (C) 2005-2007 Gregory P. Smith (greg@krypto.org)
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13 Licensed to PSF under a Contributor Agreement.
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14
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15 */
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16
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17 /* MD5 objects */
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18
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19 #include "Python.h"
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20 #include "hashlib.h"
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21
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22
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23 /* Some useful types */
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24
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25 #if SIZEOF_INT == 4
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26 typedef unsigned int MD5_INT32; /* 32-bit integer */
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27 typedef PY_LONG_LONG MD5_INT64; /* 64-bit integer */
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28 #else
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29 /* not defined. compilation will die. */
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30 #endif
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31
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32 /* The MD5 block size and message digest sizes, in bytes */
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33
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34 #define MD5_BLOCKSIZE 64
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35 #define MD5_DIGESTSIZE 16
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36
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37 /* The structure for storing MD5 info */
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38
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39 struct md5_state {
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40 MD5_INT64 length;
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41 MD5_INT32 state[4], curlen;
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42 unsigned char buf[MD5_BLOCKSIZE];
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43 };
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44
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45 typedef struct {
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46 PyObject_HEAD
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47
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48 struct md5_state hash_state;
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49 } MD5object;
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50
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51
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52 /* ------------------------------------------------------------------------
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53 *
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54 * This code for the MD5 algorithm was noted as public domain. The
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55 * original headers are pasted below.
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56 *
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57 * Several changes have been made to make it more compatible with the
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58 * Python environment and desired interface.
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59 *
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60 */
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61
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62 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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63 *
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64 * LibTomCrypt is a library that provides various cryptographic
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65 * algorithms in a highly modular and flexible manner.
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66 *
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67 * The library is free for all purposes without any express
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68 * guarantee it works.
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69 *
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70 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
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71 */
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72
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73 /* rotate the hard way (platform optimizations could be done) */
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74 #define ROLc(x, y) ( (((unsigned long)(x)<<(unsigned long)((y)&31)) | (((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
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75
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76 /* Endian Neutral macros that work on all platforms */
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77
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78 #define STORE32L(x, y) \
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79 { (y)[3] = (unsigned char)(((x)>>24)&255); (y)[2] = (unsigned char)(((x)>>16)&255); \
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80 (y)[1] = (unsigned char)(((x)>>8)&255); (y)[0] = (unsigned char)((x)&255); }
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81
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82 #define LOAD32L(x, y) \
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83 { x = ((unsigned long)((y)[3] & 255)<<24) | \
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84 ((unsigned long)((y)[2] & 255)<<16) | \
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85 ((unsigned long)((y)[1] & 255)<<8) | \
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86 ((unsigned long)((y)[0] & 255)); }
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87
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88 #define STORE64L(x, y) \
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89 { (y)[7] = (unsigned char)(((x)>>56)&255); (y)[6] = (unsigned char)(((x)>>48)&255); \
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90 (y)[5] = (unsigned char)(((x)>>40)&255); (y)[4] = (unsigned char)(((x)>>32)&255); \
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91 (y)[3] = (unsigned char)(((x)>>24)&255); (y)[2] = (unsigned char)(((x)>>16)&255); \
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92 (y)[1] = (unsigned char)(((x)>>8)&255); (y)[0] = (unsigned char)((x)&255); }
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93
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94 #ifndef MIN
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95 #define MIN(x, y) ( ((x)<(y))?(x):(y) )
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96 #endif
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97
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98
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99 /* MD5 macros */
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100
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101 #define F(x,y,z) (z ^ (x & (y ^ z)))
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102 #define G(x,y,z) (y ^ (z & (y ^ x)))
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103 #define H(x,y,z) (x^y^z)
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104 #define I(x,y,z) (y^(x|(~z)))
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105
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106 #define FF(a,b,c,d,M,s,t) \
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107 a = (a + F(b,c,d) + M + t); a = ROLc(a, s) + b;
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108
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109 #define GG(a,b,c,d,M,s,t) \
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110 a = (a + G(b,c,d) + M + t); a = ROLc(a, s) + b;
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111
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112 #define HH(a,b,c,d,M,s,t) \
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113 a = (a + H(b,c,d) + M + t); a = ROLc(a, s) + b;
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114
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115 #define II(a,b,c,d,M,s,t) \
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116 a = (a + I(b,c,d) + M + t); a = ROLc(a, s) + b;
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117
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118
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119 static void md5_compress(struct md5_state *md5, unsigned char *buf)
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120 {
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121 MD5_INT32 i, W[16], a, b, c, d;
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122
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123 assert(md5 != NULL);
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124 assert(buf != NULL);
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125
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126 /* copy the state into 512-bits into W[0..15] */
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127 for (i = 0; i < 16; i++) {
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128 LOAD32L(W[i], buf + (4*i));
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129 }
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
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diff changeset
130
43294
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131 /* copy state */
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132 a = md5->state[0];
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133 b = md5->state[1];
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134 c = md5->state[2];
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135 d = md5->state[3];
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136
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137 FF(a,b,c,d,W[0],7,0xd76aa478UL)
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138 FF(d,a,b,c,W[1],12,0xe8c7b756UL)
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139 FF(c,d,a,b,W[2],17,0x242070dbUL)
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140 FF(b,c,d,a,W[3],22,0xc1bdceeeUL)
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141 FF(a,b,c,d,W[4],7,0xf57c0fafUL)
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142 FF(d,a,b,c,W[5],12,0x4787c62aUL)
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143 FF(c,d,a,b,W[6],17,0xa8304613UL)
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144 FF(b,c,d,a,W[7],22,0xfd469501UL)
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145 FF(a,b,c,d,W[8],7,0x698098d8UL)
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146 FF(d,a,b,c,W[9],12,0x8b44f7afUL)
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147 FF(c,d,a,b,W[10],17,0xffff5bb1UL)
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148 FF(b,c,d,a,W[11],22,0x895cd7beUL)
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149 FF(a,b,c,d,W[12],7,0x6b901122UL)
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150 FF(d,a,b,c,W[13],12,0xfd987193UL)
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151 FF(c,d,a,b,W[14],17,0xa679438eUL)
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152 FF(b,c,d,a,W[15],22,0x49b40821UL)
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153 GG(a,b,c,d,W[1],5,0xf61e2562UL)
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154 GG(d,a,b,c,W[6],9,0xc040b340UL)
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155 GG(c,d,a,b,W[11],14,0x265e5a51UL)
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156 GG(b,c,d,a,W[0],20,0xe9b6c7aaUL)
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157 GG(a,b,c,d,W[5],5,0xd62f105dUL)
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158 GG(d,a,b,c,W[10],9,0x02441453UL)
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159 GG(c,d,a,b,W[15],14,0xd8a1e681UL)
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160 GG(b,c,d,a,W[4],20,0xe7d3fbc8UL)
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161 GG(a,b,c,d,W[9],5,0x21e1cde6UL)
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162 GG(d,a,b,c,W[14],9,0xc33707d6UL)
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163 GG(c,d,a,b,W[3],14,0xf4d50d87UL)
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164 GG(b,c,d,a,W[8],20,0x455a14edUL)
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165 GG(a,b,c,d,W[13],5,0xa9e3e905UL)
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166 GG(d,a,b,c,W[2],9,0xfcefa3f8UL)
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167 GG(c,d,a,b,W[7],14,0x676f02d9UL)
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168 GG(b,c,d,a,W[12],20,0x8d2a4c8aUL)
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169 HH(a,b,c,d,W[5],4,0xfffa3942UL)
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170 HH(d,a,b,c,W[8],11,0x8771f681UL)
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171 HH(c,d,a,b,W[11],16,0x6d9d6122UL)
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172 HH(b,c,d,a,W[14],23,0xfde5380cUL)
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173 HH(a,b,c,d,W[1],4,0xa4beea44UL)
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174 HH(d,a,b,c,W[4],11,0x4bdecfa9UL)
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175 HH(c,d,a,b,W[7],16,0xf6bb4b60UL)
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176 HH(b,c,d,a,W[10],23,0xbebfbc70UL)
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177 HH(a,b,c,d,W[13],4,0x289b7ec6UL)
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178 HH(d,a,b,c,W[0],11,0xeaa127faUL)
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179 HH(c,d,a,b,W[3],16,0xd4ef3085UL)
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180 HH(b,c,d,a,W[6],23,0x04881d05UL)
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181 HH(a,b,c,d,W[9],4,0xd9d4d039UL)
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182 HH(d,a,b,c,W[12],11,0xe6db99e5UL)
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183 HH(c,d,a,b,W[15],16,0x1fa27cf8UL)
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184 HH(b,c,d,a,W[2],23,0xc4ac5665UL)
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185 II(a,b,c,d,W[0],6,0xf4292244UL)
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186 II(d,a,b,c,W[7],10,0x432aff97UL)
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187 II(c,d,a,b,W[14],15,0xab9423a7UL)
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188 II(b,c,d,a,W[5],21,0xfc93a039UL)
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189 II(a,b,c,d,W[12],6,0x655b59c3UL)
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190 II(d,a,b,c,W[3],10,0x8f0ccc92UL)
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191 II(c,d,a,b,W[10],15,0xffeff47dUL)
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192 II(b,c,d,a,W[1],21,0x85845dd1UL)
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193 II(a,b,c,d,W[8],6,0x6fa87e4fUL)
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194 II(d,a,b,c,W[15],10,0xfe2ce6e0UL)
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195 II(c,d,a,b,W[6],15,0xa3014314UL)
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196 II(b,c,d,a,W[13],21,0x4e0811a1UL)
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197 II(a,b,c,d,W[4],6,0xf7537e82UL)
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198 II(d,a,b,c,W[11],10,0xbd3af235UL)
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199 II(c,d,a,b,W[2],15,0x2ad7d2bbUL)
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200 II(b,c,d,a,W[9],21,0xeb86d391UL)
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201
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202 md5->state[0] = md5->state[0] + a;
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203 md5->state[1] = md5->state[1] + b;
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204 md5->state[2] = md5->state[2] + c;
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205 md5->state[3] = md5->state[3] + d;
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206 }
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207
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208
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209 /**
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210 Initialize the hash state
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211 @param sha1 The hash state you wish to initialize
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212 */
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213 void md5_init(struct md5_state *md5)
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214 {
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215 assert(md5 != NULL);
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216 md5->state[0] = 0x67452301UL;
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217 md5->state[1] = 0xefcdab89UL;
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218 md5->state[2] = 0x98badcfeUL;
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219 md5->state[3] = 0x10325476UL;
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220 md5->curlen = 0;
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221 md5->length = 0;
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222 }
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223
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224 /**
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225 Process a block of memory though the hash
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226 @param sha1 The hash state
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227 @param in The data to hash
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228 @param inlen The length of the data (octets)
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229 */
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230 void md5_process(struct md5_state *md5,
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231 const unsigned char *in, Py_ssize_t inlen)
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232 {
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233 Py_ssize_t n;
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234
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235 assert(md5 != NULL);
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236 assert(in != NULL);
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237 assert(md5->curlen <= sizeof(md5->buf));
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238
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239 while (inlen > 0) {
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240 if (md5->curlen == 0 && inlen >= MD5_BLOCKSIZE) {
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241 md5_compress(md5, (unsigned char *)in);
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242 md5->length += MD5_BLOCKSIZE * 8;
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243 in += MD5_BLOCKSIZE;
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244 inlen -= MD5_BLOCKSIZE;
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245 } else {
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246 n = MIN(inlen, (MD5_BLOCKSIZE - md5->curlen));
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247 memcpy(md5->buf + md5->curlen, in, (size_t)n);
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248 md5->curlen += n;
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249 in += n;
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250 inlen -= n;
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251 if (md5->curlen == MD5_BLOCKSIZE) {
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252 md5_compress(md5, md5->buf);
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253 md5->length += 8*MD5_BLOCKSIZE;
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254 md5->curlen = 0;
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255 }
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256 }
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257 }
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258 }
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259
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260 /**
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261 Terminate the hash to get the digest
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262 @param sha1 The hash state
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263 @param out [out] The destination of the hash (16 bytes)
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264 */
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265 void md5_done(struct md5_state *md5, unsigned char *out)
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266 {
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267 int i;
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268
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269 assert(md5 != NULL);
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270 assert(out != NULL);
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271 assert(md5->curlen < sizeof(md5->buf));
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272
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273 /* increase the length of the message */
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274 md5->length += md5->curlen * 8;
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275
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276 /* append the '1' bit */
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277 md5->buf[md5->curlen++] = (unsigned char)0x80;
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278
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279 /* if the length is currently above 56 bytes we append zeros
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280 * then compress. Then we can fall back to padding zeros and length
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281 * encoding like normal.
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282 */
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283 if (md5->curlen > 56) {
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284 while (md5->curlen < 64) {
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285 md5->buf[md5->curlen++] = (unsigned char)0;
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286 }
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287 md5_compress(md5, md5->buf);
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288 md5->curlen = 0;
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289 }
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290
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291 /* pad upto 56 bytes of zeroes */
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292 while (md5->curlen < 56) {
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293 md5->buf[md5->curlen++] = (unsigned char)0;
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294 }
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295
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296 /* store length */
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297 STORE64L(md5->length, md5->buf+56);
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298 md5_compress(md5, md5->buf);
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299
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300 /* copy output */
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301 for (i = 0; i < 4; i++) {
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302 STORE32L(md5->state[i], out+(4*i));
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303 }
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304 }
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305
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306 /* .Source: /cvs/libtom/libtomcrypt/src/hashes/md5.c,v $ */
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307 /* .Revision: 1.10 $ */
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308 /* .Date: 2007/05/12 14:25:28 $ */
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309
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310 /*
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311 * End of copied MD5 code.
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312 *
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313 * ------------------------------------------------------------------------
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314 */
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315
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316 static PyTypeObject MD5type;
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317
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318
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319 static MD5object *
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320 newMD5object(void)
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321 {
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322 return (MD5object *)PyObject_New(MD5object, &MD5type);
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323 }
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324
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325
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326 /* Internal methods for a hash object */
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327
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328 static void
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329 MD5_dealloc(PyObject *ptr)
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330 {
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331 PyObject_Del(ptr);
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332 }
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333
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334
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335 /* External methods for a hash object */
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336
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337 PyDoc_STRVAR(MD5_copy__doc__, "Return a copy of the hash object.");
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338
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339 static PyObject *
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340 MD5_copy(MD5object *self, PyObject *unused)
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341 {
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342 MD5object *newobj;
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343
44351
86a2679dca46 #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE, Py_TYPE and Py_REFCNT.
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344 if (Py_TYPE(self) == &MD5type) {
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345 if ( (newobj = newMD5object())==NULL)
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346 return NULL;
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347 } else {
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348 if ( (newobj = newMD5object())==NULL)
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349 return NULL;
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350 }
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351
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352 newobj->hash_state = self->hash_state;
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353 return (PyObject *)newobj;
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354 }
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355
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356 PyDoc_STRVAR(MD5_digest__doc__,
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357 "Return the digest value as a string of binary data.");
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358
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359 static PyObject *
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360 MD5_digest(MD5object *self, PyObject *unused)
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361 {
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362 unsigned char digest[MD5_DIGESTSIZE];
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363 struct md5_state temp;
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364
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365 temp = self->hash_state;
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366 md5_done(&temp, digest);
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367 return PyBytes_FromStringAndSize((const char *)digest, MD5_DIGESTSIZE);
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368 }
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369
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370 PyDoc_STRVAR(MD5_hexdigest__doc__,
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371 "Return the digest value as a string of hexadecimal digits.");
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372
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373 static PyObject *
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374 MD5_hexdigest(MD5object *self, PyObject *unused)
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375 {
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376 unsigned char digest[MD5_DIGESTSIZE];
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377 struct md5_state temp;
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378 PyObject *retval;
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379 Py_UNICODE *hex_digest;
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380 int i, j;
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381
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382 /* Get the raw (binary) digest value */
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383 temp = self->hash_state;
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384 md5_done(&temp, digest);
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385
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386 /* Create a new string */
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387 retval = PyUnicode_FromStringAndSize(NULL, MD5_DIGESTSIZE * 2);
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388 if (!retval)
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389 return NULL;
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390 hex_digest = PyUnicode_AS_UNICODE(retval);
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391 if (!hex_digest) {
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392 Py_DECREF(retval);
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393 return NULL;
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394 }
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395
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396 /* Make hex version of the digest */
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397 for(i=j=0; i<MD5_DIGESTSIZE; i++) {
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398 char c;
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399 c = (digest[i] >> 4) & 0xf;
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400 c = (c>9) ? c+'a'-10 : c + '0';
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401 hex_digest[j++] = c;
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402 c = (digest[i] & 0xf);
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403 c = (c>9) ? c+'a'-10 : c + '0';
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404 hex_digest[j++] = c;
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405 }
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406 return retval;
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407 }
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408
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409 PyDoc_STRVAR(MD5_update__doc__,
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410 "Update this hash object's state with the provided string.");
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411
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412 static PyObject *
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413 MD5_update(MD5object *self, PyObject *args)
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414 {
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415 PyObject *obj;
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416 Py_buffer buf;
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417
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418 if (!PyArg_ParseTuple(args, "O:update", &obj))
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419 return NULL;
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420
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421 GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
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422
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423 md5_process(&self->hash_state, buf.buf, buf.len);
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424
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425 PyBuffer_Release(&buf);
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426 Py_INCREF(Py_None);
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427 return Py_None;
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428 }
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429
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430 static PyMethodDef MD5_methods[] = {
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431 {"copy", (PyCFunction)MD5_copy, METH_NOARGS, MD5_copy__doc__},
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432 {"digest", (PyCFunction)MD5_digest, METH_NOARGS, MD5_digest__doc__},
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433 {"hexdigest", (PyCFunction)MD5_hexdigest, METH_NOARGS, MD5_hexdigest__doc__},
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434 {"update", (PyCFunction)MD5_update, METH_VARARGS, MD5_update__doc__},
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435 {NULL, NULL} /* sentinel */
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436 };
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437
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438 static PyObject *
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439 MD5_get_block_size(PyObject *self, void *closure)
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440 {
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441 return PyLong_FromLong(MD5_BLOCKSIZE);
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442 }
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443
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444 static PyObject *
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445 MD5_get_name(PyObject *self, void *closure)
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446 {
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447 return PyUnicode_FromStringAndSize("MD5", 3);
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448 }
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449
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450 static PyObject *
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451 md5_get_digest_size(PyObject *self, void *closure)
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452 {
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453 return PyLong_FromLong(MD5_DIGESTSIZE);
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454 }
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455
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456
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457 static PyGetSetDef MD5_getseters[] = {
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458 {"block_size",
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459 (getter)MD5_get_block_size, NULL,
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460 NULL,
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461 NULL},
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462 {"name",
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463 (getter)MD5_get_name, NULL,
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464 NULL,
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465 NULL},
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466 {"digest_size",
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467 (getter)md5_get_digest_size, NULL,
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468 NULL,
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469 NULL},
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470 {NULL} /* Sentinel */
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471 };
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472
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473 static PyTypeObject MD5type = {
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474 PyVarObject_HEAD_INIT(NULL, 0)
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475 "_md5.md5", /*tp_name*/
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476 sizeof(MD5object), /*tp_size*/
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477 0, /*tp_itemsize*/
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478 /* methods */
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479 MD5_dealloc, /*tp_dealloc*/
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480 0, /*tp_print*/
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481 0, /*tp_getattr*/
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482 0, /*tp_setattr*/
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483 0, /*tp_reserved*/
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484 0, /*tp_repr*/
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485 0, /*tp_as_number*/
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486 0, /*tp_as_sequence*/
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487 0, /*tp_as_mapping*/
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488 0, /*tp_hash*/
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489 0, /*tp_call*/
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490 0, /*tp_str*/
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491 0, /*tp_getattro*/
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492 0, /*tp_setattro*/
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493 0, /*tp_as_buffer*/
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494 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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495 0, /*tp_doc*/
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496 0, /*tp_traverse*/
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497 0, /*tp_clear*/
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498 0, /*tp_richcompare*/
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499 0, /*tp_weaklistoffset*/
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500 0, /*tp_iter*/
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501 0, /*tp_iternext*/
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502 MD5_methods, /* tp_methods */
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503 NULL, /* tp_members */
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504 MD5_getseters, /* tp_getset */
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505 };
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506
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507
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508 /* The single module-level function: new() */
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509
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510 PyDoc_STRVAR(MD5_new__doc__,
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511 "Return a new MD5 hash object; optionally initialized with a string.");
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512
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513 static PyObject *
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514 MD5_new(PyObject *self, PyObject *args, PyObject *kwdict)
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515 {
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516 static char *kwlist[] = {"string", NULL};
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517 MD5object *new;
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518 PyObject *data_obj = NULL;
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519 Py_buffer buf;
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520
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521 if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|O:new", kwlist,
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522 &data_obj)) {
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523 return NULL;
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524 }
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525
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526 if (data_obj)
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527 GET_BUFFER_VIEW_OR_ERROUT(data_obj, &buf);
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528
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529 if ((new = newMD5object()) == NULL) {
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530 if (data_obj)
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531 PyBuffer_Release(&buf);
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532 return NULL;
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533 }
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534
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535 md5_init(&new->hash_state);
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536
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537 if (PyErr_Occurred()) {
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538 Py_DECREF(new);
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539 if (data_obj)
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540 PyBuffer_Release(&buf);
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541 return NULL;
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542 }
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543 if (data_obj) {
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544 md5_process(&new->hash_state, buf.buf, buf.len);
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545 PyBuffer_Release(&buf);
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546 }
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547
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548 return (PyObject *)new;
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549 }
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550
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551
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552 /* List of functions exported by this module */
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553
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554 static struct PyMethodDef MD5_functions[] = {
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555 {"md5", (PyCFunction)MD5_new, METH_VARARGS|METH_KEYWORDS, MD5_new__doc__},
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556 {NULL, NULL} /* Sentinel */
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557 };
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558
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559
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560 /* Initialize this module. */
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561
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562 #define insint(n,v) { PyModule_AddIntConstant(m,n,v); }
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563
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564
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565 static struct PyModuleDef _md5module = {
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566 PyModuleDef_HEAD_INIT,
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567 "_md5",
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568 NULL,
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569 -1,
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570 MD5_functions,
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571 NULL,
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572 NULL,
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573 NULL,
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574 NULL
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575 };
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576
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577 PyMODINIT_FUNC
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578 PyInit__md5(void)
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579 {
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580 Py_TYPE(&MD5type) = &PyType_Type;
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581 if (PyType_Ready(&MD5type) < 0)
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582 return NULL;
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583 return PyModule_Create(&_md5module);
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584 }