Mercurial > cpython-lru_cache-weakref

annotate Modules/sha1module.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 /* 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
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96 /* SHA1 macros */
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97
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98 #define F0(x,y,z) (z ^ (x & (y ^ z)))
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99 #define F1(x,y,z) (x ^ y ^ z)
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100 #define F2(x,y,z) ((x & y) | (z & (x | y)))
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101 #define F3(x,y,z) (x ^ y ^ z)
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102
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103 static void sha1_compress(struct sha1_state *sha1, unsigned char *buf)
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104 {
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105 SHA1_INT32 a,b,c,d,e,W[80],i;
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106
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107 /* copy the state into 512-bits into W[0..15] */
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108 for (i = 0; i < 16; i++) {
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109 LOAD32H(W[i], buf + (4*i));
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110 }
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111
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112 /* copy state */
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113 a = sha1->state[0];
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114 b = sha1->state[1];
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115 c = sha1->state[2];
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116 d = sha1->state[3];
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117 e = sha1->state[4];
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118
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119 /* expand it */
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120 for (i = 16; i < 80; i++) {
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121 W[i] = ROL(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
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122 }
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123
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124 /* compress */
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125 /* round one */
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126 #define FF_0(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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127 #define FF_1(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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128 #define FF_2(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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129 #define FF_3(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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130
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131 for (i = 0; i < 20; ) {
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132 FF_0(a,b,c,d,e,i++);
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133 FF_0(e,a,b,c,d,i++);
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134 FF_0(d,e,a,b,c,i++);
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135 FF_0(c,d,e,a,b,i++);
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136 FF_0(b,c,d,e,a,i++);
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137 }
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138
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139 /* round two */
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140 for (; i < 40; ) {
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141 FF_1(a,b,c,d,e,i++);
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142 FF_1(e,a,b,c,d,i++);
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143 FF_1(d,e,a,b,c,i++);
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144 FF_1(c,d,e,a,b,i++);
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145 FF_1(b,c,d,e,a,i++);
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146 }
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147
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148 /* round three */
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149 for (; i < 60; ) {
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150 FF_2(a,b,c,d,e,i++);
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151 FF_2(e,a,b,c,d,i++);
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152 FF_2(d,e,a,b,c,i++);
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153 FF_2(c,d,e,a,b,i++);
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154 FF_2(b,c,d,e,a,i++);
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155 }
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156
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157 /* round four */
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158 for (; i < 80; ) {
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159 FF_3(a,b,c,d,e,i++);
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160 FF_3(e,a,b,c,d,i++);
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161 FF_3(d,e,a,b,c,i++);
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162 FF_3(c,d,e,a,b,i++);
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163 FF_3(b,c,d,e,a,i++);
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164 }
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165
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166 #undef FF_0
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167 #undef FF_1
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168 #undef FF_2
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169 #undef FF_3
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170
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171 /* store */
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172 sha1->state[0] = sha1->state[0] + a;
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173 sha1->state[1] = sha1->state[1] + b;
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174 sha1->state[2] = sha1->state[2] + c;
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175 sha1->state[3] = sha1->state[3] + d;
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176 sha1->state[4] = sha1->state[4] + e;
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177 }
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178
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179 /**
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180 Initialize the hash state
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181 @param sha1 The hash state you wish to initialize
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182 */
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183 static void
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184 sha1_init(struct sha1_state *sha1)
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185 {
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186 assert(sha1 != NULL);
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187 sha1->state[0] = 0x67452301UL;
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188 sha1->state[1] = 0xefcdab89UL;
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189 sha1->state[2] = 0x98badcfeUL;
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190 sha1->state[3] = 0x10325476UL;
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191 sha1->state[4] = 0xc3d2e1f0UL;
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192 sha1->curlen = 0;
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193 sha1->length = 0;
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194 }
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195
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196 /**
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197 Process a block of memory though the hash
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198 @param sha1 The hash state
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199 @param in The data to hash
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200 @param inlen The length of the data (octets)
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201 */
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202 static void
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203 sha1_process(struct sha1_state *sha1,
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204 const unsigned char *in, Py_ssize_t inlen)
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205 {
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206 Py_ssize_t n;
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207
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208 assert(sha1 != NULL);
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209 assert(in != NULL);
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210 assert(sha1->curlen <= sizeof(sha1->buf));
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211
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212 while (inlen > 0) {
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213 if (sha1->curlen == 0 && inlen >= SHA1_BLOCKSIZE) {
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214 sha1_compress(sha1, (unsigned char *)in);
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215 sha1->length += SHA1_BLOCKSIZE * 8;
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216 in += SHA1_BLOCKSIZE;
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217 inlen -= SHA1_BLOCKSIZE;
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218 } else {
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219 n = Py_MIN(inlen, (Py_ssize_t)(SHA1_BLOCKSIZE - sha1->curlen));
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220 memcpy(sha1->buf + sha1->curlen, in, (size_t)n);
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221 sha1->curlen += (SHA1_INT32)n;
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222 in += n;
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223 inlen -= n;
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224 if (sha1->curlen == SHA1_BLOCKSIZE) {
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225 sha1_compress(sha1, sha1->buf);
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226 sha1->length += 8*SHA1_BLOCKSIZE;
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227 sha1->curlen = 0;
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228 }
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229 }
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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 Terminate the hash to get the digest
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235 @param sha1 The hash state
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236 @param out [out] The destination of the hash (20 bytes)
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237 */
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238 static void
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239 sha1_done(struct sha1_state *sha1, unsigned char *out)
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240 {
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241 int i;
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242
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243 assert(sha1 != NULL);
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244 assert(out != NULL);
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245 assert(sha1->curlen < sizeof(sha1->buf));
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246
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247 /* increase the length of the message */
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248 sha1->length += sha1->curlen * 8;
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249
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250 /* append the '1' bit */
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251 sha1->buf[sha1->curlen++] = (unsigned char)0x80;
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252
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253 /* if the length is currently above 56 bytes we append zeros
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254 * then compress. Then we can fall back to padding zeros and length
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255 * encoding like normal.
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256 */
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257 if (sha1->curlen > 56) {
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258 while (sha1->curlen < 64) {
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259 sha1->buf[sha1->curlen++] = (unsigned char)0;
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260 }
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261 sha1_compress(sha1, sha1->buf);
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262 sha1->curlen = 0;
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263 }
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264
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265 /* pad upto 56 bytes of zeroes */
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266 while (sha1->curlen < 56) {
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267 sha1->buf[sha1->curlen++] = (unsigned char)0;
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268 }
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269
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270 /* store length */
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271 STORE64H(sha1->length, sha1->buf+56);
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272 sha1_compress(sha1, sha1->buf);
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273
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274 /* copy output */
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275 for (i = 0; i < 5; i++) {
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276 STORE32H(sha1->state[i], out+(4*i));
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277 }
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278 }
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279
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280
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281 /* .Source: /cvs/libtom/libtomcrypt/src/hashes/sha1.c,v $ */
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282 /* .Revision: 1.10 $ */
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283 /* .Date: 2007/05/12 14:25:28 $ */
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284
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285 /*
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286 * End of copied SHA1 code.
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287 *
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288 * ------------------------------------------------------------------------
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289 */
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290
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291 static PyTypeObject SHA1type;
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292
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293
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294 static SHA1object *
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295 newSHA1object(void)
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296 {
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297 return (SHA1object *)PyObject_New(SHA1object, &SHA1type);
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298 }
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299
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300
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301 /* Internal methods for a hash object */
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302
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303 static void
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304 SHA1_dealloc(PyObject *ptr)
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305 {
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306 PyObject_Del(ptr);
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307 }
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308
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309
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310 /* External methods for a hash object */
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311
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312 PyDoc_STRVAR(SHA1_copy__doc__, "Return a copy of the hash object.");
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313
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314 static PyObject *
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315 SHA1_copy(SHA1object *self, PyObject *unused)
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316 {
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317 SHA1object *newobj;
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318
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319 if ((newobj = newSHA1object()) == NULL)
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320 return NULL;
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321
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322 newobj->hash_state = self->hash_state;
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323 return (PyObject *)newobj;
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324 }
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325
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326 PyDoc_STRVAR(SHA1_digest__doc__,
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327 "Return the digest value as a string of binary data.");
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328
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329 static PyObject *
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330 SHA1_digest(SHA1object *self, PyObject *unused)
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331 {
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332 unsigned char digest[SHA1_DIGESTSIZE];
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333 struct sha1_state temp;
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334
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335 temp = self->hash_state;
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336 sha1_done(&temp, digest);
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337 return PyBytes_FromStringAndSize((const char *)digest, SHA1_DIGESTSIZE);
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338 }
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339
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340 PyDoc_STRVAR(SHA1_hexdigest__doc__,
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341 "Return the digest value as a string of hexadecimal digits.");
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342
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343 static PyObject *
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344 SHA1_hexdigest(SHA1object *self, PyObject *unused)
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345 {
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346 unsigned char digest[SHA1_DIGESTSIZE];
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347 struct sha1_state temp;
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348 PyObject *retval;
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349 Py_UCS1 *hex_digest;
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350 int i, j;
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351
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352 /* Get the raw (binary) digest value */
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353 temp = self->hash_state;
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354 sha1_done(&temp, digest);
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355
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356 /* Create a new string */
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357 retval = PyUnicode_New(SHA1_DIGESTSIZE * 2, 127);
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358 if (!retval)
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359 return NULL;
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360 hex_digest = PyUnicode_1BYTE_DATA(retval);
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361
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362 /* Make hex version of the digest */
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363 for(i=j=0; i<SHA1_DIGESTSIZE; i++) {
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364 unsigned char c;
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365 c = (digest[i] >> 4) & 0xf;
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366 hex_digest[j++] = Py_hexdigits[c];
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367 c = (digest[i] & 0xf);
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368 hex_digest[j++] = Py_hexdigits[c];
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369 }
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370 #ifdef Py_DEBUG
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371 assert(_PyUnicode_CheckConsistency(retval, 1));
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372 #endif
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373 return retval;
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374 }
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375
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376 PyDoc_STRVAR(SHA1_update__doc__,
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377 "Update this hash object's state with the provided string.");
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378
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379 static PyObject *
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380 SHA1_update(SHA1object *self, PyObject *args)
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381 {
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382 PyObject *obj;
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383 Py_buffer buf;
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384
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385 if (!PyArg_ParseTuple(args, "O:update", &obj))
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386 return NULL;
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387
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388 GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
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389
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390 sha1_process(&self->hash_state, buf.buf, buf.len);
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391
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392 PyBuffer_Release(&buf);
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393 Py_INCREF(Py_None);
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394 return Py_None;
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395 }
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396
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397 static PyMethodDef SHA1_methods[] = {
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398 {"copy", (PyCFunction)SHA1_copy, METH_NOARGS, SHA1_copy__doc__},
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399 {"digest", (PyCFunction)SHA1_digest, METH_NOARGS, SHA1_digest__doc__},
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400 {"hexdigest", (PyCFunction)SHA1_hexdigest, METH_NOARGS, SHA1_hexdigest__doc__},
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401 {"update", (PyCFunction)SHA1_update, METH_VARARGS, SHA1_update__doc__},
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402 {NULL, NULL} /* sentinel */
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403 };
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404
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405 static PyObject *
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406 SHA1_get_block_size(PyObject *self, void *closure)
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407 {
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408 return PyLong_FromLong(SHA1_BLOCKSIZE);
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409 }
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410
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411 static PyObject *
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412 SHA1_get_name(PyObject *self, void *closure)
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413 {
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414 return PyUnicode_FromStringAndSize("sha1", 4);
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415 }
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416
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417 static PyObject *
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418 sha1_get_digest_size(PyObject *self, void *closure)
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419 {
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420 return PyLong_FromLong(SHA1_DIGESTSIZE);
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421 }
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422
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423
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424 static PyGetSetDef SHA1_getseters[] = {
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425 {"block_size",
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426 (getter)SHA1_get_block_size, NULL,
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427 NULL,
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428 NULL},
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429 {"name",
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430 (getter)SHA1_get_name, NULL,
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431 NULL,
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432 NULL},
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433 {"digest_size",
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434 (getter)sha1_get_digest_size, NULL,
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435 NULL,
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436 NULL},
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437 {NULL} /* Sentinel */
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438 };
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439
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440 static PyTypeObject SHA1type = {
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441 PyVarObject_HEAD_INIT(NULL, 0)
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442 "_sha1.sha1", /*tp_name*/
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443 sizeof(SHA1object), /*tp_size*/
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444 0, /*tp_itemsize*/
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445 /* methods */
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446 SHA1_dealloc, /*tp_dealloc*/
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447 0, /*tp_print*/
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448 0, /*tp_getattr*/
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449 0, /*tp_setattr*/
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450 0, /*tp_reserved*/
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451 0, /*tp_repr*/
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452 0, /*tp_as_number*/
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453 0, /*tp_as_sequence*/
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454 0, /*tp_as_mapping*/
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455 0, /*tp_hash*/
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456 0, /*tp_call*/
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457 0, /*tp_str*/
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458 0, /*tp_getattro*/
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459 0, /*tp_setattro*/
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460 0, /*tp_as_buffer*/
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461 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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462 0, /*tp_doc*/
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463 0, /*tp_traverse*/
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464 0, /*tp_clear*/
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465 0, /*tp_richcompare*/
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466 0, /*tp_weaklistoffset*/
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467 0, /*tp_iter*/
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468 0, /*tp_iternext*/
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469 SHA1_methods, /* tp_methods */
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470 NULL, /* tp_members */
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471 SHA1_getseters, /* tp_getset */
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472 };
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473
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474
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475 /* The single module-level function: new() */
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476
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477 PyDoc_STRVAR(SHA1_new__doc__,
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478 "Return a new SHA1 hash object; optionally initialized with a string.");
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479
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480 static PyObject *
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481 SHA1_new(PyObject *self, PyObject *args, PyObject *kwdict)
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482 {
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483 static char *kwlist[] = {"string", NULL};
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484 SHA1object *new;
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485 PyObject *data_obj = NULL;
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486 Py_buffer buf;
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487
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488 if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|O:new", kwlist,
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489 &data_obj)) {
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490 return NULL;
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491 }
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492
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493 if (data_obj)
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494 GET_BUFFER_VIEW_OR_ERROUT(data_obj, &buf);
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495
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496 if ((new = newSHA1object()) == NULL) {
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497 if (data_obj)
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498 PyBuffer_Release(&buf);
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499 return NULL;
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500 }
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501
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502 sha1_init(&new->hash_state);
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503
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504 if (PyErr_Occurred()) {
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505 Py_DECREF(new);
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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 if (data_obj) {
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511 sha1_process(&new->hash_state, buf.buf, buf.len);
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512 PyBuffer_Release(&buf);
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513 }
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514
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515 return (PyObject *)new;
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516 }
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517
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518
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519 /* List of functions exported by this module */
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520
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521 static struct PyMethodDef SHA1_functions[] = {
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522 {"sha1",(PyCFunction)SHA1_new, METH_VARARGS|METH_KEYWORDS,SHA1_new__doc__},
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523 {NULL, NULL} /* Sentinel */
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524 };
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525
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526
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527 /* Initialize this module. */
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528
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529 #define insint(n,v) { PyModule_AddIntConstant(m,n,v); }
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530
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531
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532 static struct PyModuleDef _sha1module = {
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533 PyModuleDef_HEAD_INIT,
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534 "_sha1",
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535 NULL,
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536 -1,
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537 SHA1_functions,
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538 NULL,
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539 NULL,
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540 NULL,
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541 NULL
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542 };
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543
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544 PyMODINIT_FUNC
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545 PyInit__sha1(void)
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546 {
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547 PyObject *m;
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548
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549 Py_TYPE(&SHA1type) = &PyType_Type;
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550 if (PyType_Ready(&SHA1type) < 0)
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551 return NULL;
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552
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553 m = PyModule_Create(&_sha1module);
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554 if (m == NULL)
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555 return NULL;
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556
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557 Py_INCREF((PyObject *)&SHA1type);
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558 PyModule_AddObject(m, "SHA1Type", (PyObject *)&SHA1type);
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559 return m;
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560 }