Mercurial > cpython-lru_cache-weakref

annotate Modules/sha1module.c @ 64166:d0e9febfa00a 3.1

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Merged revisions 84172 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r84172 | martin.v.loewis | 2010-08-18 18:12:23 +0200 (Mi, 18 Aug 2010) | 2 lines Restore GIL in nis_cat in case of error. ........
author Martin v. Löwis <martin@v.loewis.de>
date Thu, 19 Aug 2010 09:03:03 +0000
parents f197407bdba2
children 2855d6363192
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1 /* SHA1 module */
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2
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3 /* This module provides an interface to the SHA1 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 /* SHA1 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 SHA1_INT32; /* 32-bit integer */
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27 typedef PY_LONG_LONG SHA1_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 SHA1 block size and message digest sizes, in bytes */
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33
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34 #define SHA1_BLOCKSIZE 64
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35 #define SHA1_DIGESTSIZE 20
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36
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37 /* The structure for storing SHA1 info */
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38
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39 struct sha1_state {
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40 SHA1_INT64 length;
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41 SHA1_INT32 state[5], curlen;
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42 unsigned char buf[SHA1_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 sha1_state hash_state;
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49 } SHA1object;
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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 SHA1 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 ROL(x, y) ( (((unsigned long)(x)<<(unsigned long)((y)&31)) | (((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
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75 #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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76
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77 /* Endian Neutral macros that work on all platforms */
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78
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79 #define STORE32H(x, y) \
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80 { (y)[0] = (unsigned char)(((x)>>24)&255); (y)[1] = (unsigned char)(((x)>>16)&255); \
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81 (y)[2] = (unsigned char)(((x)>>8)&255); (y)[3] = (unsigned char)((x)&255); }
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82
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83 #define LOAD32H(x, y) \
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84 { x = ((unsigned long)((y)[0] & 255)<<24) | \
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85 ((unsigned long)((y)[1] & 255)<<16) | \
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86 ((unsigned long)((y)[2] & 255)<<8) | \
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87 ((unsigned long)((y)[3] & 255)); }
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88
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89 #define STORE64H(x, y) \
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90 { (y)[0] = (unsigned char)(((x)>>56)&255); (y)[1] = (unsigned char)(((x)>>48)&255); \
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91 (y)[2] = (unsigned char)(((x)>>40)&255); (y)[3] = (unsigned char)(((x)>>32)&255); \
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92 (y)[4] = (unsigned char)(((x)>>24)&255); (y)[5] = (unsigned char)(((x)>>16)&255); \
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93 (y)[6] = (unsigned char)(((x)>>8)&255); (y)[7] = (unsigned char)((x)&255); }
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94
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95 #ifndef MIN
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96 #define MIN(x, y) ( ((x)<(y))?(x):(y) )
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97 #endif
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98
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99
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100 /* SHA1 macros */
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101
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102 #define F0(x,y,z) (z ^ (x & (y ^ z)))
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103 #define F1(x,y,z) (x ^ y ^ z)
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104 #define F2(x,y,z) ((x & y) | (z & (x | y)))
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105 #define F3(x,y,z) (x ^ y ^ z)
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106
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107 static void sha1_compress(struct sha1_state *sha1, unsigned char *buf)
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108 {
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109 SHA1_INT32 a,b,c,d,e,W[80],i;
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110
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111 /* copy the state into 512-bits into W[0..15] */
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112 for (i = 0; i < 16; i++) {
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113 LOAD32H(W[i], buf + (4*i));
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114 }
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115
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116 /* copy state */
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117 a = sha1->state[0];
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118 b = sha1->state[1];
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119 c = sha1->state[2];
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120 d = sha1->state[3];
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121 e = sha1->state[4];
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122
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123 /* expand it */
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124 for (i = 16; i < 80; i++) {
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125 W[i] = ROL(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
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126 }
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127
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128 /* compress */
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129 /* round one */
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130 #define FF0(a,b,c,d,e,i) e = (ROLc(a, 5) + F0(b,c,d) + e + W[i] + 0x5a827999UL); b = ROLc(b, 30);
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131 #define FF1(a,b,c,d,e,i) e = (ROLc(a, 5) + F1(b,c,d) + e + W[i] + 0x6ed9eba1UL); b = ROLc(b, 30);
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132 #define FF2(a,b,c,d,e,i) e = (ROLc(a, 5) + F2(b,c,d) + e + W[i] + 0x8f1bbcdcUL); b = ROLc(b, 30);
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133 #define FF3(a,b,c,d,e,i) e = (ROLc(a, 5) + F3(b,c,d) + e + W[i] + 0xca62c1d6UL); b = ROLc(b, 30);
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134
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135 for (i = 0; i < 20; ) {
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136 FF0(a,b,c,d,e,i++);
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137 FF0(e,a,b,c,d,i++);
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138 FF0(d,e,a,b,c,i++);
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139 FF0(c,d,e,a,b,i++);
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140 FF0(b,c,d,e,a,i++);
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141 }
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142
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143 /* round two */
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144 for (; i < 40; ) {
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145 FF1(a,b,c,d,e,i++);
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146 FF1(e,a,b,c,d,i++);
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147 FF1(d,e,a,b,c,i++);
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148 FF1(c,d,e,a,b,i++);
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149 FF1(b,c,d,e,a,i++);
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150 }
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151
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152 /* round three */
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153 for (; i < 60; ) {
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154 FF2(a,b,c,d,e,i++);
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155 FF2(e,a,b,c,d,i++);
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156 FF2(d,e,a,b,c,i++);
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157 FF2(c,d,e,a,b,i++);
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158 FF2(b,c,d,e,a,i++);
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159 }
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160
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161 /* round four */
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162 for (; i < 80; ) {
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163 FF3(a,b,c,d,e,i++);
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164 FF3(e,a,b,c,d,i++);
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165 FF3(d,e,a,b,c,i++);
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166 FF3(c,d,e,a,b,i++);
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167 FF3(b,c,d,e,a,i++);
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168 }
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169
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170 #undef FF0
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171 #undef FF1
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172 #undef FF2
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173 #undef FF3
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174
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175 /* store */
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176 sha1->state[0] = sha1->state[0] + a;
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177 sha1->state[1] = sha1->state[1] + b;
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178 sha1->state[2] = sha1->state[2] + c;
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179 sha1->state[3] = sha1->state[3] + d;
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180 sha1->state[4] = sha1->state[4] + e;
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181 }
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182
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183 /**
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184 Initialize the hash state
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185 @param sha1 The hash state you wish to initialize
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186 */
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187 void sha1_init(struct sha1_state *sha1)
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188 {
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189 assert(sha1 != NULL);
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190 sha1->state[0] = 0x67452301UL;
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191 sha1->state[1] = 0xefcdab89UL;
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192 sha1->state[2] = 0x98badcfeUL;
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193 sha1->state[3] = 0x10325476UL;
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194 sha1->state[4] = 0xc3d2e1f0UL;
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195 sha1->curlen = 0;
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196 sha1->length = 0;
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197 }
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198
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199 /**
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200 Process a block of memory though the hash
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201 @param sha1 The hash state
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202 @param in The data to hash
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203 @param inlen The length of the data (octets)
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204 */
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205 void sha1_process(struct sha1_state *sha1,
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206 const unsigned char *in, unsigned long inlen)
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207 {
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208 unsigned long n;
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209
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210 assert(sha1 != NULL);
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211 assert(in != NULL);
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212 assert(sha1->curlen <= sizeof(sha1->buf));
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213
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214 while (inlen > 0) {
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215 if (sha1->curlen == 0 && inlen >= SHA1_BLOCKSIZE) {
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216 sha1_compress(sha1, (unsigned char *)in);
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217 sha1->length += SHA1_BLOCKSIZE * 8;
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218 in += SHA1_BLOCKSIZE;
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219 inlen -= SHA1_BLOCKSIZE;
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220 } else {
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221 n = MIN(inlen, (SHA1_BLOCKSIZE - sha1->curlen));
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222 memcpy(sha1->buf + sha1->curlen, in, (size_t)n);
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223 sha1->curlen += n;
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224 in += n;
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225 inlen -= n;
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226 if (sha1->curlen == SHA1_BLOCKSIZE) {
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227 sha1_compress(sha1, sha1->buf);
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228 sha1->length += 8*SHA1_BLOCKSIZE;
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229 sha1->curlen = 0;
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230 }
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231 }
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232 }
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233 }
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234
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235 /**
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236 Terminate the hash to get the digest
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237 @param sha1 The hash state
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238 @param out [out] The destination of the hash (20 bytes)
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239 */
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240 void sha1_done(struct sha1_state *sha1, unsigned char *out)
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241 {
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242 int i;
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243
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244 assert(sha1 != NULL);
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245 assert(out != NULL);
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246 assert(sha1->curlen < sizeof(sha1->buf));
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247
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248 /* increase the length of the message */
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249 sha1->length += sha1->curlen * 8;
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250
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251 /* append the '1' bit */
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252 sha1->buf[sha1->curlen++] = (unsigned char)0x80;
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253
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254 /* if the length is currently above 56 bytes we append zeros
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255 * then compress. Then we can fall back to padding zeros and length
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256 * encoding like normal.
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257 */
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258 if (sha1->curlen > 56) {
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259 while (sha1->curlen < 64) {
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260 sha1->buf[sha1->curlen++] = (unsigned char)0;
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261 }
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262 sha1_compress(sha1, sha1->buf);
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263 sha1->curlen = 0;
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264 }
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265
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266 /* pad upto 56 bytes of zeroes */
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267 while (sha1->curlen < 56) {
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268 sha1->buf[sha1->curlen++] = (unsigned char)0;
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269 }
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270
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271 /* store length */
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272 STORE64H(sha1->length, sha1->buf+56);
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273 sha1_compress(sha1, sha1->buf);
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274
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275 /* copy output */
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276 for (i = 0; i < 5; i++) {
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277 STORE32H(sha1->state[i], out+(4*i));
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278 }
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279 }
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280
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281
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282 /* .Source: /cvs/libtom/libtomcrypt/src/hashes/sha1.c,v $ */
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283 /* .Revision: 1.10 $ */
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284 /* .Date: 2007/05/12 14:25:28 $ */
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285
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286 /*
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287 * End of copied SHA1 code.
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288 *
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289 * ------------------------------------------------------------------------
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290 */
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291
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292 static PyTypeObject SHA1type;
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293
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294
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295 static SHA1object *
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296 newSHA1object(void)
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297 {
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298 return (SHA1object *)PyObject_New(SHA1object, &SHA1type);
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299 }
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300
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301
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302 /* Internal methods for a hash object */
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303
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304 static void
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305 SHA1_dealloc(PyObject *ptr)
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306 {
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307 PyObject_Del(ptr);
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308 }
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309
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310
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311 /* External methods for a hash object */
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312
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313 PyDoc_STRVAR(SHA1_copy__doc__, "Return a copy of the hash object.");
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314
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315 static PyObject *
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316 SHA1_copy(SHA1object *self, PyObject *unused)
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317 {
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318 SHA1object *newobj;
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319
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86a2679dca46 #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE, Py_TYPE and Py_REFCNT.
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320 if (Py_TYPE(self) == &SHA1type) {
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321 if ( (newobj = newSHA1object())==NULL)
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322 return NULL;
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323 } else {
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324 if ( (newobj = newSHA1object())==NULL)
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325 return NULL;
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326 }
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327
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328 newobj->hash_state = self->hash_state;
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329 return (PyObject *)newobj;
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330 }
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331
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332 PyDoc_STRVAR(SHA1_digest__doc__,
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333 "Return the digest value as a string of binary data.");
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334
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335 static PyObject *
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336 SHA1_digest(SHA1object *self, PyObject *unused)
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337 {
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338 unsigned char digest[SHA1_DIGESTSIZE];
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339 struct sha1_state temp;
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340
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341 temp = self->hash_state;
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342 sha1_done(&temp, digest);
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343 return PyBytes_FromStringAndSize((const char *)digest, SHA1_DIGESTSIZE);
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344 }
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345
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346 PyDoc_STRVAR(SHA1_hexdigest__doc__,
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347 "Return the digest value as a string of hexadecimal digits.");
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348
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349 static PyObject *
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350 SHA1_hexdigest(SHA1object *self, PyObject *unused)
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351 {
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352 unsigned char digest[SHA1_DIGESTSIZE];
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353 struct sha1_state temp;
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354 PyObject *retval;
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355 Py_UNICODE *hex_digest;
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356 int i, j;
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357
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358 /* Get the raw (binary) digest value */
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359 temp = self->hash_state;
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360 sha1_done(&temp, digest);
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361
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362 /* Create a new string */
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363 retval = PyUnicode_FromStringAndSize(NULL, SHA1_DIGESTSIZE * 2);
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364 if (!retval)
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365 return NULL;
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366 hex_digest = PyUnicode_AS_UNICODE(retval);
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367 if (!hex_digest) {
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368 Py_DECREF(retval);
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369 return NULL;
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370 }
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371
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372 /* Make hex version of the digest */
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373 for(i=j=0; i<SHA1_DIGESTSIZE; i++) {
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374 char c;
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375 c = (digest[i] >> 4) & 0xf;
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376 c = (c>9) ? c+'a'-10 : c + '0';
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377 hex_digest[j++] = c;
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378 c = (digest[i] & 0xf);
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379 c = (c>9) ? c+'a'-10 : c + '0';
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380 hex_digest[j++] = c;
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381 }
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382 return retval;
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383 }
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384
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385 PyDoc_STRVAR(SHA1_update__doc__,
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386 "Update this hash object's state with the provided string.");
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387
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388 static PyObject *
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389 SHA1_update(SHA1object *self, PyObject *args)
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390 {
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391 PyObject *obj;
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392 Py_buffer buf;
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393
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394 if (!PyArg_ParseTuple(args, "O:update", &obj))
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395 return NULL;
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396
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397 GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
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398
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399 sha1_process(&self->hash_state, buf.buf, buf.len);
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400
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401 PyBuffer_Release(&buf);
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402 Py_INCREF(Py_None);
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403 return Py_None;
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404 }
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405
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406 static PyMethodDef SHA1_methods[] = {
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407 {"copy", (PyCFunction)SHA1_copy, METH_NOARGS, SHA1_copy__doc__},
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408 {"digest", (PyCFunction)SHA1_digest, METH_NOARGS, SHA1_digest__doc__},
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409 {"hexdigest", (PyCFunction)SHA1_hexdigest, METH_NOARGS, SHA1_hexdigest__doc__},
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410 {"update", (PyCFunction)SHA1_update, METH_VARARGS, SHA1_update__doc__},
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411 {NULL, NULL} /* sentinel */
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412 };
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413
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414 static PyObject *
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415 SHA1_get_block_size(PyObject *self, void *closure)
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416 {
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417 return PyLong_FromLong(SHA1_BLOCKSIZE);
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418 }
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419
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420 static PyObject *
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421 SHA1_get_name(PyObject *self, void *closure)
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422 {
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423 return PyUnicode_FromStringAndSize("SHA1", 3);
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424 }
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425
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426 static PyObject *
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427 sha1_get_digest_size(PyObject *self, void *closure)
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428 {
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429 return PyLong_FromLong(SHA1_DIGESTSIZE);
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430 }
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431
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432
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433 static PyGetSetDef SHA1_getseters[] = {
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434 {"block_size",
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435 (getter)SHA1_get_block_size, NULL,
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436 NULL,
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437 NULL},
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438 {"name",
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439 (getter)SHA1_get_name, NULL,
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440 NULL,
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441 NULL},
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442 {"digest_size",
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443 (getter)sha1_get_digest_size, NULL,
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444 NULL,
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445 NULL},
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446 {NULL} /* Sentinel */
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447 };
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448
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449 static PyTypeObject SHA1type = {
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450 PyVarObject_HEAD_INIT(NULL, 0)
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451 "_sha1.sha1", /*tp_name*/
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452 sizeof(SHA1object), /*tp_size*/
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453 0, /*tp_itemsize*/
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454 /* methods */
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455 SHA1_dealloc, /*tp_dealloc*/
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456 0, /*tp_print*/
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457 0, /*tp_getattr*/
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458 0, /*tp_setattr*/
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459 0, /*tp_reserved*/
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460 0, /*tp_repr*/
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461 0, /*tp_as_number*/
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462 0, /*tp_as_sequence*/
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463 0, /*tp_as_mapping*/
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464 0, /*tp_hash*/
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465 0, /*tp_call*/
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466 0, /*tp_str*/
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467 0, /*tp_getattro*/
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468 0, /*tp_setattro*/
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469 0, /*tp_as_buffer*/
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470 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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471 0, /*tp_doc*/
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472 0, /*tp_traverse*/
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473 0, /*tp_clear*/
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474 0, /*tp_richcompare*/
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475 0, /*tp_weaklistoffset*/
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476 0, /*tp_iter*/
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477 0, /*tp_iternext*/
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478 SHA1_methods, /* tp_methods */
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479 NULL, /* tp_members */
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480 SHA1_getseters, /* tp_getset */
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481 };
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482
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483
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484 /* The single module-level function: new() */
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485
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486 PyDoc_STRVAR(SHA1_new__doc__,
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487 "Return a new SHA1 hash object; optionally initialized with a string.");
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488
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489 static PyObject *
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490 SHA1_new(PyObject *self, PyObject *args, PyObject *kwdict)
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491 {
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492 static char *kwlist[] = {"string", NULL};
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493 SHA1object *new;
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494 PyObject *data_obj = NULL;
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495 Py_buffer buf;
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496
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497 if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|O:new", kwlist,
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498 &data_obj)) {
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499 return NULL;
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500 }
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501
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502 if (data_obj)
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503 GET_BUFFER_VIEW_OR_ERROUT(data_obj, &buf);
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504
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505 if ((new = newSHA1object()) == NULL) {
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506 if (data_obj)
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507 PyBuffer_Release(&buf);
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508 return NULL;
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509 }
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510
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511 sha1_init(&new->hash_state);
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512
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513 if (PyErr_Occurred()) {
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514 Py_DECREF(new);
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515 if (data_obj)
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516 PyBuffer_Release(&buf);
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517 return NULL;
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518 }
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519 if (data_obj) {
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520 sha1_process(&new->hash_state, buf.buf, buf.len);
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521 PyBuffer_Release(&buf);
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522 }
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523
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524 return (PyObject *)new;
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525 }
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526
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527
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528 /* List of functions exported by this module */
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529
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530 static struct PyMethodDef SHA1_functions[] = {
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531 {"sha1",(PyCFunction)SHA1_new, METH_VARARGS|METH_KEYWORDS,SHA1_new__doc__},
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532 {NULL, NULL} /* Sentinel */
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533 };
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534
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535
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536 /* Initialize this module. */
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537
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538 #define insint(n,v) { PyModule_AddIntConstant(m,n,v); }
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539
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540
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541 static struct PyModuleDef _sha1module = {
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542 PyModuleDef_HEAD_INIT,
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543 "_sha1",
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544 NULL,
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545 -1,
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546 SHA1_functions,
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547 NULL,
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548 NULL,
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549 NULL,
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550 NULL
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551 };
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552
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553 PyMODINIT_FUNC
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554 PyInit__sha1(void)
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555 {
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556 Py_TYPE(&SHA1type) = &PyType_Type;
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557 if (PyType_Ready(&SHA1type) < 0)
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558 return NULL;
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559 return PyModule_Create(&_sha1module);
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560 }