Mercurial > cpython-lru_cache-weakref

annotate Modules/sha1module.c @ 84007:dbfbdf2b5c19 3.3

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Fix #17967: For ftp urls CWD to target instead of hopping to each directory towards target. This fixes a bug where target is accessible, but parent directories are restricted.
author Senthil Kumaran <senthil@uthcode.com>
date Sat, 01 Jun 2013 08:27:06 -0700
parents aec657f11b66
children c34c018a8390 0b361bc74f02
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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 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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131 #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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132 #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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133 #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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134
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135 for (i = 0; i < 20; ) {
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136 FF_0(a,b,c,d,e,i++);
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137 FF_0(e,a,b,c,d,i++);
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138 FF_0(d,e,a,b,c,i++);
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139 FF_0(c,d,e,a,b,i++);
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140 FF_0(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 FF_1(a,b,c,d,e,i++);
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146 FF_1(e,a,b,c,d,i++);
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147 FF_1(d,e,a,b,c,i++);
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148 FF_1(c,d,e,a,b,i++);
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149 FF_1(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 FF_2(a,b,c,d,e,i++);
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155 FF_2(e,a,b,c,d,i++);
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156 FF_2(d,e,a,b,c,i++);
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157 FF_2(c,d,e,a,b,i++);
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158 FF_2(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 FF_3(a,b,c,d,e,i++);
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164 FF_3(e,a,b,c,d,i++);
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165 FF_3(d,e,a,b,c,i++);
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166 FF_3(c,d,e,a,b,i++);
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167 FF_3(b,c,d,e,a,i++);
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168 }
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169
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170 #undef FF_0
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171 #undef FF_1
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172 #undef FF_2
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173 #undef FF_3
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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 static void
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188 sha1_init(struct sha1_state *sha1)
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189 {
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190 assert(sha1 != NULL);
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191 sha1->state[0] = 0x67452301UL;
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192 sha1->state[1] = 0xefcdab89UL;
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193 sha1->state[2] = 0x98badcfeUL;
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194 sha1->state[3] = 0x10325476UL;
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195 sha1->state[4] = 0xc3d2e1f0UL;
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196 sha1->curlen = 0;
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197 sha1->length = 0;
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198 }
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199
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200 /**
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201 Process a block of memory though the hash
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202 @param sha1 The hash state
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203 @param in The data to hash
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204 @param inlen The length of the data (octets)
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205 */
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206 static void
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207 sha1_process(struct sha1_state *sha1,
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208 const unsigned char *in, Py_ssize_t inlen)
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209 {
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210 Py_ssize_t n;
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211
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212 assert(sha1 != NULL);
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213 assert(in != NULL);
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214 assert(sha1->curlen <= sizeof(sha1->buf));
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215
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216 while (inlen > 0) {
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217 if (sha1->curlen == 0 && inlen >= SHA1_BLOCKSIZE) {
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218 sha1_compress(sha1, (unsigned char *)in);
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219 sha1->length += SHA1_BLOCKSIZE * 8;
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220 in += SHA1_BLOCKSIZE;
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221 inlen -= SHA1_BLOCKSIZE;
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222 } else {
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223 n = MIN(inlen, (Py_ssize_t)(SHA1_BLOCKSIZE - sha1->curlen));
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224 memcpy(sha1->buf + sha1->curlen, in, (size_t)n);
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225 sha1->curlen += n;
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226 in += n;
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227 inlen -= n;
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228 if (sha1->curlen == SHA1_BLOCKSIZE) {
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229 sha1_compress(sha1, sha1->buf);
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230 sha1->length += 8*SHA1_BLOCKSIZE;
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231 sha1->curlen = 0;
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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
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237 /**
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238 Terminate the hash to get the digest
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239 @param sha1 The hash state
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240 @param out [out] The destination of the hash (20 bytes)
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241 */
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242 static void
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243 sha1_done(struct sha1_state *sha1, unsigned char *out)
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244 {
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245 int i;
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246
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247 assert(sha1 != NULL);
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248 assert(out != NULL);
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249 assert(sha1->curlen < sizeof(sha1->buf));
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250
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251 /* increase the length of the message */
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252 sha1->length += sha1->curlen * 8;
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253
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254 /* append the '1' bit */
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255 sha1->buf[sha1->curlen++] = (unsigned char)0x80;
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256
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257 /* if the length is currently above 56 bytes we append zeros
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258 * then compress. Then we can fall back to padding zeros and length
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259 * encoding like normal.
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260 */
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261 if (sha1->curlen > 56) {
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262 while (sha1->curlen < 64) {
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263 sha1->buf[sha1->curlen++] = (unsigned char)0;
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264 }
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265 sha1_compress(sha1, sha1->buf);
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266 sha1->curlen = 0;
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267 }
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268
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269 /* pad upto 56 bytes of zeroes */
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270 while (sha1->curlen < 56) {
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271 sha1->buf[sha1->curlen++] = (unsigned char)0;
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272 }
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273
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274 /* store length */
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275 STORE64H(sha1->length, sha1->buf+56);
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276 sha1_compress(sha1, sha1->buf);
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277
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278 /* copy output */
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279 for (i = 0; i < 5; i++) {
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280 STORE32H(sha1->state[i], out+(4*i));
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281 }
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282 }
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283
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284
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285 /* .Source: /cvs/libtom/libtomcrypt/src/hashes/sha1.c,v $ */
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286 /* .Revision: 1.10 $ */
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287 /* .Date: 2007/05/12 14:25:28 $ */
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288
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289 /*
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290 * End of copied SHA1 code.
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291 *
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292 * ------------------------------------------------------------------------
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293 */
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294
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295 static PyTypeObject SHA1type;
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296
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297
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298 static SHA1object *
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299 newSHA1object(void)
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300 {
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301 return (SHA1object *)PyObject_New(SHA1object, &SHA1type);
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302 }
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303
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304
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305 /* Internal methods for a hash object */
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306
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307 static void
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308 SHA1_dealloc(PyObject *ptr)
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309 {
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310 PyObject_Del(ptr);
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311 }
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312
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313
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314 /* External methods for a hash object */
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315
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316 PyDoc_STRVAR(SHA1_copy__doc__, "Return a copy of the hash object.");
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317
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318 static PyObject *
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319 SHA1_copy(SHA1object *self, PyObject *unused)
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320 {
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321 SHA1object *newobj;
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322
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323 if ((newobj = newSHA1object()) == NULL)
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324 return NULL;
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325
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326 newobj->hash_state = self->hash_state;
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327 return (PyObject *)newobj;
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328 }
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329
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330 PyDoc_STRVAR(SHA1_digest__doc__,
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331 "Return the digest value as a string of binary data.");
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332
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333 static PyObject *
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334 SHA1_digest(SHA1object *self, PyObject *unused)
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335 {
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336 unsigned char digest[SHA1_DIGESTSIZE];
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337 struct sha1_state temp;
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338
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339 temp = self->hash_state;
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340 sha1_done(&temp, digest);
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341 return PyBytes_FromStringAndSize((const char *)digest, SHA1_DIGESTSIZE);
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342 }
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343
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344 PyDoc_STRVAR(SHA1_hexdigest__doc__,
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345 "Return the digest value as a string of hexadecimal digits.");
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346
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347 static PyObject *
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348 SHA1_hexdigest(SHA1object *self, PyObject *unused)
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349 {
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350 unsigned char digest[SHA1_DIGESTSIZE];
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351 struct sha1_state temp;
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352 PyObject *retval;
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353 Py_UCS1 *hex_digest;
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354 int i, j;
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355
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356 /* Get the raw (binary) digest value */
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357 temp = self->hash_state;
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358 sha1_done(&temp, digest);
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359
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360 /* Create a new string */
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361 retval = PyUnicode_New(SHA1_DIGESTSIZE * 2, 127);
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362 if (!retval)
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363 return NULL;
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364 hex_digest = PyUnicode_1BYTE_DATA(retval);
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365
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366 /* Make hex version of the digest */
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367 for(i=j=0; i<SHA1_DIGESTSIZE; i++) {
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368 unsigned char c;
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369 c = (digest[i] >> 4) & 0xf;
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370 hex_digest[j++] = Py_hexdigits[c];
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371 c = (digest[i] & 0xf);
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372 hex_digest[j++] = Py_hexdigits[c];
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373 }
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374 #ifdef Py_DEBUG
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375 assert(_PyUnicode_CheckConsistency(retval, 1));
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376 #endif
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377 return retval;
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378 }
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379
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380 PyDoc_STRVAR(SHA1_update__doc__,
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381 "Update this hash object's state with the provided string.");
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382
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383 static PyObject *
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384 SHA1_update(SHA1object *self, PyObject *args)
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385 {
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386 PyObject *obj;
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387 Py_buffer buf;
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388
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389 if (!PyArg_ParseTuple(args, "O:update", &obj))
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390 return NULL;
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391
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392 GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
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393
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394 sha1_process(&self->hash_state, buf.buf, buf.len);
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395
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396 PyBuffer_Release(&buf);
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397 Py_INCREF(Py_None);
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398 return Py_None;
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399 }
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400
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401 static PyMethodDef SHA1_methods[] = {
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402 {"copy", (PyCFunction)SHA1_copy, METH_NOARGS, SHA1_copy__doc__},
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403 {"digest", (PyCFunction)SHA1_digest, METH_NOARGS, SHA1_digest__doc__},
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404 {"hexdigest", (PyCFunction)SHA1_hexdigest, METH_NOARGS, SHA1_hexdigest__doc__},
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405 {"update", (PyCFunction)SHA1_update, METH_VARARGS, SHA1_update__doc__},
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406 {NULL, NULL} /* sentinel */
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407 };
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408
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409 static PyObject *
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410 SHA1_get_block_size(PyObject *self, void *closure)
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411 {
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412 return PyLong_FromLong(SHA1_BLOCKSIZE);
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413 }
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414
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415 static PyObject *
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416 SHA1_get_name(PyObject *self, void *closure)
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417 {
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418 return PyUnicode_FromStringAndSize("SHA1", 3);
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419 }
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420
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421 static PyObject *
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422 sha1_get_digest_size(PyObject *self, void *closure)
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423 {
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424 return PyLong_FromLong(SHA1_DIGESTSIZE);
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425 }
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426
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427
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428 static PyGetSetDef SHA1_getseters[] = {
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429 {"block_size",
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430 (getter)SHA1_get_block_size, NULL,
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431 NULL,
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432 NULL},
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433 {"name",
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434 (getter)SHA1_get_name, NULL,
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435 NULL,
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436 NULL},
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437 {"digest_size",
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438 (getter)sha1_get_digest_size, NULL,
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439 NULL,
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440 NULL},
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441 {NULL} /* Sentinel */
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442 };
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443
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444 static PyTypeObject SHA1type = {
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445 PyVarObject_HEAD_INIT(NULL, 0)
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446 "_sha1.sha1", /*tp_name*/
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447 sizeof(SHA1object), /*tp_size*/
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448 0, /*tp_itemsize*/
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449 /* methods */
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450 SHA1_dealloc, /*tp_dealloc*/
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451 0, /*tp_print*/
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452 0, /*tp_getattr*/
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453 0, /*tp_setattr*/
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454 0, /*tp_reserved*/
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455 0, /*tp_repr*/
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456 0, /*tp_as_number*/
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457 0, /*tp_as_sequence*/
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458 0, /*tp_as_mapping*/
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459 0, /*tp_hash*/
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460 0, /*tp_call*/
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461 0, /*tp_str*/
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462 0, /*tp_getattro*/
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463 0, /*tp_setattro*/
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464 0, /*tp_as_buffer*/
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465 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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466 0, /*tp_doc*/
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467 0, /*tp_traverse*/
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468 0, /*tp_clear*/
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469 0, /*tp_richcompare*/
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470 0, /*tp_weaklistoffset*/
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471 0, /*tp_iter*/
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472 0, /*tp_iternext*/
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473 SHA1_methods, /* tp_methods */
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474 NULL, /* tp_members */
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475 SHA1_getseters, /* tp_getset */
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476 };
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477
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478
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479 /* The single module-level function: new() */
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480
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481 PyDoc_STRVAR(SHA1_new__doc__,
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482 "Return a new SHA1 hash object; optionally initialized with a string.");
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483
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484 static PyObject *
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485 SHA1_new(PyObject *self, PyObject *args, PyObject *kwdict)
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486 {
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487 static char *kwlist[] = {"string", NULL};
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488 SHA1object *new;
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489 PyObject *data_obj = NULL;
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490 Py_buffer buf;
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491
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492 if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|O:new", kwlist,
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493 &data_obj)) {
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494 return NULL;
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495 }
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496
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497 if (data_obj)
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498 GET_BUFFER_VIEW_OR_ERROUT(data_obj, &buf);
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499
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500 if ((new = newSHA1object()) == NULL) {
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501 if (data_obj)
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502 PyBuffer_Release(&buf);
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503 return NULL;
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504 }
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505
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506 sha1_init(&new->hash_state);
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507
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508 if (PyErr_Occurred()) {
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509 Py_DECREF(new);
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510 if (data_obj)
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511 PyBuffer_Release(&buf);
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512 return NULL;
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513 }
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514 if (data_obj) {
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515 sha1_process(&new->hash_state, buf.buf, buf.len);
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516 PyBuffer_Release(&buf);
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517 }
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518
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519 return (PyObject *)new;
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520 }
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521
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522
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523 /* List of functions exported by this module */
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524
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525 static struct PyMethodDef SHA1_functions[] = {
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526 {"sha1",(PyCFunction)SHA1_new, METH_VARARGS|METH_KEYWORDS,SHA1_new__doc__},
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527 {NULL, NULL} /* Sentinel */
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528 };
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529
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530
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531 /* Initialize this module. */
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532
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533 #define insint(n,v) { PyModule_AddIntConstant(m,n,v); }
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534
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535
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536 static struct PyModuleDef _sha1module = {
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537 PyModuleDef_HEAD_INIT,
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538 "_sha1",
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539 NULL,
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540 -1,
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541 SHA1_functions,
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542 NULL,
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543 NULL,
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544 NULL,
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545 NULL
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546 };
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547
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548 PyMODINIT_FUNC
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549 PyInit__sha1(void)
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550 {
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551 Py_TYPE(&SHA1type) = &PyType_Type;
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552 if (PyType_Ready(&SHA1type) < 0)
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553 return NULL;
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554 return PyModule_Create(&_sha1module);
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555 }