Mercurial > cpython-lru_cache-weakref

annotate Modules/md5module.c @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 27da6e790c41
children
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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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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
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95 /* MD5 macros */
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96
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97 #define F(x,y,z) (z ^ (x & (y ^ z)))
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98 #define G(x,y,z) (y ^ (z & (y ^ x)))
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99 #define H(x,y,z) (x^y^z)
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100 #define I(x,y,z) (y^(x|(~z)))
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101
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102 #define FF(a,b,c,d,M,s,t) \
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103 a = (a + F(b,c,d) + M + t); a = ROLc(a, s) + b;
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104
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105 #define GG(a,b,c,d,M,s,t) \
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106 a = (a + G(b,c,d) + M + t); a = ROLc(a, s) + b;
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107
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108 #define HH(a,b,c,d,M,s,t) \
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109 a = (a + H(b,c,d) + M + t); a = ROLc(a, s) + b;
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110
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111 #define II(a,b,c,d,M,s,t) \
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112 a = (a + I(b,c,d) + M + t); a = ROLc(a, s) + b;
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113
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114
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115 static void md5_compress(struct md5_state *md5, unsigned char *buf)
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116 {
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117 MD5_INT32 i, W[16], a, b, c, d;
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118
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119 assert(md5 != NULL);
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120 assert(buf != NULL);
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121
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122 /* copy the state into 512-bits into W[0..15] */
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123 for (i = 0; i < 16; i++) {
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124 LOAD32L(W[i], buf + (4*i));
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125 }
61466
cab14be0ada1 Recorded merge of revisions 81029 via svnmerge from
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126
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127 /* copy state */
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128 a = md5->state[0];
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129 b = md5->state[1];
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130 c = md5->state[2];
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131 d = md5->state[3];
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132
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133 FF(a,b,c,d,W[0],7,0xd76aa478UL)
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134 FF(d,a,b,c,W[1],12,0xe8c7b756UL)
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135 FF(c,d,a,b,W[2],17,0x242070dbUL)
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136 FF(b,c,d,a,W[3],22,0xc1bdceeeUL)
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137 FF(a,b,c,d,W[4],7,0xf57c0fafUL)
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138 FF(d,a,b,c,W[5],12,0x4787c62aUL)
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139 FF(c,d,a,b,W[6],17,0xa8304613UL)
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140 FF(b,c,d,a,W[7],22,0xfd469501UL)
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141 FF(a,b,c,d,W[8],7,0x698098d8UL)
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142 FF(d,a,b,c,W[9],12,0x8b44f7afUL)
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143 FF(c,d,a,b,W[10],17,0xffff5bb1UL)
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144 FF(b,c,d,a,W[11],22,0x895cd7beUL)
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145 FF(a,b,c,d,W[12],7,0x6b901122UL)
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146 FF(d,a,b,c,W[13],12,0xfd987193UL)
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147 FF(c,d,a,b,W[14],17,0xa679438eUL)
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148 FF(b,c,d,a,W[15],22,0x49b40821UL)
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149 GG(a,b,c,d,W[1],5,0xf61e2562UL)
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150 GG(d,a,b,c,W[6],9,0xc040b340UL)
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151 GG(c,d,a,b,W[11],14,0x265e5a51UL)
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152 GG(b,c,d,a,W[0],20,0xe9b6c7aaUL)
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153 GG(a,b,c,d,W[5],5,0xd62f105dUL)
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154 GG(d,a,b,c,W[10],9,0x02441453UL)
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155 GG(c,d,a,b,W[15],14,0xd8a1e681UL)
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156 GG(b,c,d,a,W[4],20,0xe7d3fbc8UL)
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157 GG(a,b,c,d,W[9],5,0x21e1cde6UL)
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158 GG(d,a,b,c,W[14],9,0xc33707d6UL)
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159 GG(c,d,a,b,W[3],14,0xf4d50d87UL)
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160 GG(b,c,d,a,W[8],20,0x455a14edUL)
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161 GG(a,b,c,d,W[13],5,0xa9e3e905UL)
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162 GG(d,a,b,c,W[2],9,0xfcefa3f8UL)
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163 GG(c,d,a,b,W[7],14,0x676f02d9UL)
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164 GG(b,c,d,a,W[12],20,0x8d2a4c8aUL)
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165 HH(a,b,c,d,W[5],4,0xfffa3942UL)
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166 HH(d,a,b,c,W[8],11,0x8771f681UL)
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167 HH(c,d,a,b,W[11],16,0x6d9d6122UL)
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168 HH(b,c,d,a,W[14],23,0xfde5380cUL)
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169 HH(a,b,c,d,W[1],4,0xa4beea44UL)
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170 HH(d,a,b,c,W[4],11,0x4bdecfa9UL)
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171 HH(c,d,a,b,W[7],16,0xf6bb4b60UL)
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172 HH(b,c,d,a,W[10],23,0xbebfbc70UL)
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173 HH(a,b,c,d,W[13],4,0x289b7ec6UL)
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174 HH(d,a,b,c,W[0],11,0xeaa127faUL)
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175 HH(c,d,a,b,W[3],16,0xd4ef3085UL)
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176 HH(b,c,d,a,W[6],23,0x04881d05UL)
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177 HH(a,b,c,d,W[9],4,0xd9d4d039UL)
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178 HH(d,a,b,c,W[12],11,0xe6db99e5UL)
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179 HH(c,d,a,b,W[15],16,0x1fa27cf8UL)
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180 HH(b,c,d,a,W[2],23,0xc4ac5665UL)
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181 II(a,b,c,d,W[0],6,0xf4292244UL)
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182 II(d,a,b,c,W[7],10,0x432aff97UL)
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183 II(c,d,a,b,W[14],15,0xab9423a7UL)
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184 II(b,c,d,a,W[5],21,0xfc93a039UL)
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185 II(a,b,c,d,W[12],6,0x655b59c3UL)
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186 II(d,a,b,c,W[3],10,0x8f0ccc92UL)
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187 II(c,d,a,b,W[10],15,0xffeff47dUL)
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188 II(b,c,d,a,W[1],21,0x85845dd1UL)
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189 II(a,b,c,d,W[8],6,0x6fa87e4fUL)
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190 II(d,a,b,c,W[15],10,0xfe2ce6e0UL)
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191 II(c,d,a,b,W[6],15,0xa3014314UL)
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192 II(b,c,d,a,W[13],21,0x4e0811a1UL)
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193 II(a,b,c,d,W[4],6,0xf7537e82UL)
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194 II(d,a,b,c,W[11],10,0xbd3af235UL)
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195 II(c,d,a,b,W[2],15,0x2ad7d2bbUL)
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196 II(b,c,d,a,W[9],21,0xeb86d391UL)
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197
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198 md5->state[0] = md5->state[0] + a;
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199 md5->state[1] = md5->state[1] + b;
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200 md5->state[2] = md5->state[2] + c;
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201 md5->state[3] = md5->state[3] + d;
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202 }
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203
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204
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205 /**
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206 Initialize the hash state
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207 @param sha1 The hash state you wish to initialize
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208 */
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209 static void
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210 md5_init(struct md5_state *md5)
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211 {
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212 assert(md5 != NULL);
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213 md5->state[0] = 0x67452301UL;
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214 md5->state[1] = 0xefcdab89UL;
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215 md5->state[2] = 0x98badcfeUL;
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216 md5->state[3] = 0x10325476UL;
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217 md5->curlen = 0;
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218 md5->length = 0;
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219 }
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220
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221 /**
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222 Process a block of memory though the hash
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223 @param sha1 The hash state
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224 @param in The data to hash
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225 @param inlen The length of the data (octets)
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226 */
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227 static void
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228 md5_process(struct md5_state *md5, const unsigned char *in, Py_ssize_t inlen)
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229 {
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230 Py_ssize_t n;
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231
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232 assert(md5 != NULL);
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233 assert(in != NULL);
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234 assert(md5->curlen <= sizeof(md5->buf));
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235
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236 while (inlen > 0) {
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237 if (md5->curlen == 0 && inlen >= MD5_BLOCKSIZE) {
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238 md5_compress(md5, (unsigned char *)in);
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239 md5->length += MD5_BLOCKSIZE * 8;
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240 in += MD5_BLOCKSIZE;
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241 inlen -= MD5_BLOCKSIZE;
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242 } else {
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243 n = Py_MIN(inlen, (Py_ssize_t)(MD5_BLOCKSIZE - md5->curlen));
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244 memcpy(md5->buf + md5->curlen, in, (size_t)n);
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245 md5->curlen += (MD5_INT32)n;
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246 in += n;
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247 inlen -= n;
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248 if (md5->curlen == MD5_BLOCKSIZE) {
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249 md5_compress(md5, md5->buf);
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250 md5->length += 8*MD5_BLOCKSIZE;
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251 md5->curlen = 0;
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252 }
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253 }
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254 }
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255 }
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256
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257 /**
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258 Terminate the hash to get the digest
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259 @param sha1 The hash state
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260 @param out [out] The destination of the hash (16 bytes)
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261 */
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262 static void
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263 md5_done(struct md5_state *md5, unsigned char *out)
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264 {
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265 int i;
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266
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267 assert(md5 != NULL);
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268 assert(out != NULL);
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269 assert(md5->curlen < sizeof(md5->buf));
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270
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271 /* increase the length of the message */
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272 md5->length += md5->curlen * 8;
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273
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274 /* append the '1' bit */
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275 md5->buf[md5->curlen++] = (unsigned char)0x80;
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276
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277 /* if the length is currently above 56 bytes we append zeros
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278 * then compress. Then we can fall back to padding zeros and length
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279 * encoding like normal.
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280 */
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281 if (md5->curlen > 56) {
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282 while (md5->curlen < 64) {
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283 md5->buf[md5->curlen++] = (unsigned char)0;
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284 }
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285 md5_compress(md5, md5->buf);
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286 md5->curlen = 0;
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287 }
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288
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289 /* pad upto 56 bytes of zeroes */
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290 while (md5->curlen < 56) {
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291 md5->buf[md5->curlen++] = (unsigned char)0;
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292 }
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293
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294 /* store length */
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295 STORE64L(md5->length, md5->buf+56);
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296 md5_compress(md5, md5->buf);
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297
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298 /* copy output */
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299 for (i = 0; i < 4; i++) {
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300 STORE32L(md5->state[i], out+(4*i));
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301 }
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302 }
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303
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304 /* .Source: /cvs/libtom/libtomcrypt/src/hashes/md5.c,v $ */
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305 /* .Revision: 1.10 $ */
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306 /* .Date: 2007/05/12 14:25:28 $ */
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307
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308 /*
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309 * End of copied MD5 code.
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310 *
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311 * ------------------------------------------------------------------------
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312 */
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313
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314 static PyTypeObject MD5type;
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315
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316
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317 static MD5object *
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318 newMD5object(void)
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319 {
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320 return (MD5object *)PyObject_New(MD5object, &MD5type);
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321 }
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322
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323
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324 /* Internal methods for a hash object */
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325
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326 static void
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327 MD5_dealloc(PyObject *ptr)
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328 {
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329 PyObject_Del(ptr);
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330 }
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331
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332
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333 /* External methods for a hash object */
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334
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335 PyDoc_STRVAR(MD5_copy__doc__, "Return a copy of the hash object.");
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336
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337 static PyObject *
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338 MD5_copy(MD5object *self, PyObject *unused)
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339 {
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340 MD5object *newobj;
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341
44351
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342 if (Py_TYPE(self) == &MD5type) {
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343 if ( (newobj = newMD5object())==NULL)
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344 return NULL;
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345 } else {
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346 if ( (newobj = newMD5object())==NULL)
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347 return NULL;
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348 }
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349
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350 newobj->hash_state = self->hash_state;
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351 return (PyObject *)newobj;
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352 }
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353
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354 PyDoc_STRVAR(MD5_digest__doc__,
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355 "Return the digest value as a string of binary data.");
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356
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357 static PyObject *
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358 MD5_digest(MD5object *self, PyObject *unused)
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359 {
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360 unsigned char digest[MD5_DIGESTSIZE];
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361 struct md5_state temp;
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362
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363 temp = self->hash_state;
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364 md5_done(&temp, digest);
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365 return PyBytes_FromStringAndSize((const char *)digest, MD5_DIGESTSIZE);
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366 }
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367
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368 PyDoc_STRVAR(MD5_hexdigest__doc__,
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369 "Return the digest value as a string of hexadecimal digits.");
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370
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371 static PyObject *
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372 MD5_hexdigest(MD5object *self, PyObject *unused)
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373 {
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374 unsigned char digest[MD5_DIGESTSIZE];
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375 struct md5_state temp;
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376 PyObject *retval;
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377 Py_UCS1 *hex_digest;
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378 int i, j;
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379
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380 /* Get the raw (binary) digest value */
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381 temp = self->hash_state;
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382 md5_done(&temp, digest);
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383
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384 /* Create a new string */
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385 retval = PyUnicode_New(MD5_DIGESTSIZE * 2, 127);
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386 if (!retval)
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387 return NULL;
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388 hex_digest = PyUnicode_1BYTE_DATA(retval);
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389
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390 /* Make hex version of the digest */
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391 for(i=j=0; i<MD5_DIGESTSIZE; i++) {
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392 unsigned char c;
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393 c = (digest[i] >> 4) & 0xf;
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394 hex_digest[j++] = Py_hexdigits[c];
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395 c = (digest[i] & 0xf);
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396 hex_digest[j++] = Py_hexdigits[c];
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397 }
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398 #ifdef Py_DEBUG
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399 assert(_PyUnicode_CheckConsistency(retval, 1));
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400 #endif
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401 return retval;
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402 }
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403
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404 PyDoc_STRVAR(MD5_update__doc__,
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405 "Update this hash object's state with the provided string.");
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406
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407 static PyObject *
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408 MD5_update(MD5object *self, PyObject *args)
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409 {
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410 PyObject *obj;
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411 Py_buffer buf;
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412
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413 if (!PyArg_ParseTuple(args, "O:update", &obj))
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414 return NULL;
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415
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416 GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
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417
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418 md5_process(&self->hash_state, buf.buf, buf.len);
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419
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420 PyBuffer_Release(&buf);
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421 Py_INCREF(Py_None);
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422 return Py_None;
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423 }
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424
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425 static PyMethodDef MD5_methods[] = {
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426 {"copy", (PyCFunction)MD5_copy, METH_NOARGS, MD5_copy__doc__},
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427 {"digest", (PyCFunction)MD5_digest, METH_NOARGS, MD5_digest__doc__},
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428 {"hexdigest", (PyCFunction)MD5_hexdigest, METH_NOARGS, MD5_hexdigest__doc__},
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429 {"update", (PyCFunction)MD5_update, METH_VARARGS, MD5_update__doc__},
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430 {NULL, NULL} /* sentinel */
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431 };
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432
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433 static PyObject *
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434 MD5_get_block_size(PyObject *self, void *closure)
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435 {
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436 return PyLong_FromLong(MD5_BLOCKSIZE);
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437 }
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438
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439 static PyObject *
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440 MD5_get_name(PyObject *self, void *closure)
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441 {
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442 return PyUnicode_FromStringAndSize("md5", 3);
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443 }
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444
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445 static PyObject *
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446 md5_get_digest_size(PyObject *self, void *closure)
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447 {
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448 return PyLong_FromLong(MD5_DIGESTSIZE);
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449 }
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450
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451
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452 static PyGetSetDef MD5_getseters[] = {
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453 {"block_size",
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454 (getter)MD5_get_block_size, NULL,
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455 NULL,
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456 NULL},
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457 {"name",
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458 (getter)MD5_get_name, NULL,
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459 NULL,
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460 NULL},
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461 {"digest_size",
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462 (getter)md5_get_digest_size, NULL,
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463 NULL,
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464 NULL},
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465 {NULL} /* Sentinel */
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466 };
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467
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468 static PyTypeObject MD5type = {
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469 PyVarObject_HEAD_INIT(NULL, 0)
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470 "_md5.md5", /*tp_name*/
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471 sizeof(MD5object), /*tp_size*/
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472 0, /*tp_itemsize*/
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473 /* methods */
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474 MD5_dealloc, /*tp_dealloc*/
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475 0, /*tp_print*/
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476 0, /*tp_getattr*/
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477 0, /*tp_setattr*/
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478 0, /*tp_reserved*/
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479 0, /*tp_repr*/
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480 0, /*tp_as_number*/
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481 0, /*tp_as_sequence*/
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482 0, /*tp_as_mapping*/
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483 0, /*tp_hash*/
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484 0, /*tp_call*/
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485 0, /*tp_str*/
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486 0, /*tp_getattro*/
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487 0, /*tp_setattro*/
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488 0, /*tp_as_buffer*/
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489 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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490 0, /*tp_doc*/
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491 0, /*tp_traverse*/
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492 0, /*tp_clear*/
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493 0, /*tp_richcompare*/
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494 0, /*tp_weaklistoffset*/
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495 0, /*tp_iter*/
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496 0, /*tp_iternext*/
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497 MD5_methods, /* tp_methods */
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498 NULL, /* tp_members */
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499 MD5_getseters, /* tp_getset */
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500 };
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501
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502
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503 /* The single module-level function: new() */
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504
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505 PyDoc_STRVAR(MD5_new__doc__,
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506 "Return a new MD5 hash object; optionally initialized with a string.");
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507
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508 static PyObject *
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509 MD5_new(PyObject *self, PyObject *args, PyObject *kwdict)
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510 {
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511 static char *kwlist[] = {"string", NULL};
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512 MD5object *new;
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513 PyObject *data_obj = NULL;
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514 Py_buffer buf;
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515
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516 if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|O:new", kwlist,
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517 &data_obj)) {
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518 return NULL;
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519 }
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520
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521 if (data_obj)
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522 GET_BUFFER_VIEW_OR_ERROUT(data_obj, &buf);
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523
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524 if ((new = newMD5object()) == NULL) {
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525 if (data_obj)
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526 PyBuffer_Release(&buf);
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527 return NULL;
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528 }
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529
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530 md5_init(&new->hash_state);
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531
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532 if (PyErr_Occurred()) {
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533 Py_DECREF(new);
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534 if (data_obj)
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535 PyBuffer_Release(&buf);
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536 return NULL;
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537 }
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538 if (data_obj) {
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539 md5_process(&new->hash_state, buf.buf, buf.len);
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540 PyBuffer_Release(&buf);
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541 }
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542
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543 return (PyObject *)new;
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544 }
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545
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546
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547 /* List of functions exported by this module */
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548
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549 static struct PyMethodDef MD5_functions[] = {
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550 {"md5", (PyCFunction)MD5_new, METH_VARARGS|METH_KEYWORDS, MD5_new__doc__},
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551 {NULL, NULL} /* Sentinel */
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552 };
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553
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554
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555 /* Initialize this module. */
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556
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557 #define insint(n,v) { PyModule_AddIntConstant(m,n,v); }
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558
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559
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560 static struct PyModuleDef _md5module = {
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561 PyModuleDef_HEAD_INIT,
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562 "_md5",
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563 NULL,
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564 -1,
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565 MD5_functions,
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566 NULL,
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567 NULL,
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568 NULL,
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569 NULL
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570 };
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571
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572 PyMODINIT_FUNC
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573 PyInit__md5(void)
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574 {
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575 PyObject *m;
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576
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577 Py_TYPE(&MD5type) = &PyType_Type;
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578 if (PyType_Ready(&MD5type) < 0)
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579 return NULL;
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580
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581 m = PyModule_Create(&_md5module);
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582 if (m == NULL)
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583 return NULL;
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584
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585 Py_INCREF((PyObject *)&MD5type);
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586 PyModule_AddObject(m, "MD5Type", (PyObject *)&MD5type);
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587 return m;
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588 }