Mercurial > cpython-lru_cache-weakref

annotate Modules/md5module.c @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 54ebf085d26f
children
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1
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2 /* MD5 module */
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3
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4 /* This module provides an interface to the RSA Data Security,
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5 Inc. MD5 Message-Digest Algorithm, described in RFC 1321.
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6 It requires the files md5c.c and md5.h (which are slightly changed
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7 from the versions in the RFC to avoid the "global.h" file.) */
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8
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9
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10 /* MD5 objects */
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12 #include "Python.h"
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13 #include "md5.h"
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14
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15 typedef struct {
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16 PyObject_HEAD
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17 MD5_CTX md5; /* the context holder */
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18 } md5object;
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19
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20 staticforward PyTypeObject MD5type;
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21
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22 #define is_md5object(v) ((v)->ob_type == &MD5type)
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23
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24 static md5object *
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25 newmd5object(void)
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26 {
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27 md5object *md5p;
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28
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29 md5p = PyObject_New(md5object, &MD5type);
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30 if (md5p == NULL)
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31 return NULL;
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32
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33 MD5Init(&md5p->md5); /* actual initialisation */
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34 return md5p;
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35 }
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37
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38 /* MD5 methods */
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39
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40 static void
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41 md5_dealloc(md5object *md5p)
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42 {
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43 PyObject_Del(md5p);
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44 }
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46
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47 /* MD5 methods-as-attributes */
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48
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49 static PyObject *
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50 md5_update(md5object *self, PyObject *args)
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51 {
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52 unsigned char *cp;
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53 int len;
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54
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55 if (!PyArg_Parse(args, "s#", &cp, &len))
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56 return NULL;
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57
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58 MD5Update(&self->md5, cp, len);
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59
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60 Py_INCREF(Py_None);
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61 return Py_None;
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62 }
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63
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64 static char update_doc [] =
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65 "update (arg)\n\
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66 \n\
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67 Update the md5 object with the string arg. Repeated calls are\n\
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68 equivalent to a single call with the concatenation of all the\n\
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69 arguments.";
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70
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71
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72 static PyObject *
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73 md5_digest(md5object *self, PyObject *args)
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74 {
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75 MD5_CTX mdContext;
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76 unsigned char aDigest[16];
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77
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78 if (!PyArg_NoArgs(args))
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79 return NULL;
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80
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81 /* make a temporary copy, and perform the final */
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82 mdContext = self->md5;
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83 MD5Final(aDigest, &mdContext);
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84
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85 return PyString_FromStringAndSize((char *)aDigest, 16);
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86 }
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87
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88 static char digest_doc [] =
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89 "digest() -> string\n\
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90 \n\
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91 Return the digest of the strings passed to the update() method so\n\
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92 far. This is an 16-byte string which may contain non-ASCII characters,\n\
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93 including null bytes.";
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94
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95
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96 static PyObject *
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97 md5_hexdigest(md5object *self, PyObject *args)
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98 {
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99 MD5_CTX mdContext;
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100 unsigned char digest[16];
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101 unsigned char hexdigest[32];
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102 int i, j;
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103
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104 if (!PyArg_NoArgs(args))
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105 return NULL;
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106
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107 /* make a temporary copy, and perform the final */
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108 mdContext = self->md5;
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109 MD5Final(digest, &mdContext);
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110
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111 /* Make hex version of the digest */
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112 for(i=j=0; i<16; i++) {
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113 char c;
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114 c = (digest[i] >> 4) & 0xf;
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115 c = (c>9) ? c+'a'-10 : c + '0';
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116 hexdigest[j++] = c;
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117 c = (digest[i] & 0xf);
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118 c = (c>9) ? c+'a'-10 : c + '0';
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119 hexdigest[j++] = c;
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120 }
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121 return PyString_FromStringAndSize((char*)hexdigest, 32);
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122 }
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123
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124
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125 static char hexdigest_doc [] =
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126 "hexdigest() -> string\n\
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127 \n\
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128 Like digest(), but returns the digest as a string of hexadecimal digits.";
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129
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130
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131 static PyObject *
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132 md5_copy(md5object *self, PyObject *args)
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133 {
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134 md5object *md5p;
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135
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136 if (!PyArg_NoArgs(args))
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137 return NULL;
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138
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139 if ((md5p = newmd5object()) == NULL)
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140 return NULL;
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141
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142 md5p->md5 = self->md5;
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143
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144 return (PyObject *)md5p;
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145 }
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146
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147 static char copy_doc [] =
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148 "copy() -> md5 object\n\
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149 \n\
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150 Return a copy (``clone'') of the md5 object.";
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151
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152
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153 static PyMethodDef md5_methods[] = {
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154 {"update", (PyCFunction)md5_update, METH_OLDARGS, update_doc},
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155 {"digest", (PyCFunction)md5_digest, METH_OLDARGS, digest_doc},
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156 {"hexdigest", (PyCFunction)md5_hexdigest, METH_OLDARGS, hexdigest_doc},
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157 {"copy", (PyCFunction)md5_copy, METH_OLDARGS, copy_doc},
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158 {NULL, NULL} /* sentinel */
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159 };
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160
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161 static PyObject *
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162 md5_getattr(md5object *self, char *name)
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163 {
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164 if (strcmp(name, "digest_size") == 0) {
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165 return PyInt_FromLong(16);
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166 }
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167
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168 return Py_FindMethod(md5_methods, (PyObject *)self, name);
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169 }
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170
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171 static char module_doc [] =
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172
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173 "This module implements the interface to RSA's MD5 message digest\n\
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174 algorithm (see also Internet RFC 1321). Its use is quite\n\
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175 straightforward: use the new() to create an md5 object. You can now\n\
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176 feed this object with arbitrary strings using the update() method, and\n\
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177 at any point you can ask it for the digest (a strong kind of 128-bit\n\
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178 checksum, a.k.a. ``fingerprint'') of the concatenation of the strings\n\
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179 fed to it so far using the digest() method.\n\
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180 \n\
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181 Functions:\n\
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182 \n\
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183 new([arg]) -- return a new md5 object, initialized with arg if provided\n\
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184 md5([arg]) -- DEPRECATED, same as new, but for compatibility\n\
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185 \n\
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186 Special Objects:\n\
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187 \n\
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188 MD5Type -- type object for md5 objects\n\
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189 ";
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190
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191 static char md5type_doc [] =
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192 "An md5 represents the object used to calculate the MD5 checksum of a\n\
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193 string of information.\n\
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194 \n\
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195 Methods:\n\
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196 \n\
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197 update() -- updates the current digest with an additional string\n\
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198 digest() -- return the current digest value\n\
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199 hexdigest() -- return the current digest as a string of hexadecimal digits\n\
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200 copy() -- return a copy of the current md5 object\n\
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201 ";
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202
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203 statichere PyTypeObject MD5type = {
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204 PyObject_HEAD_INIT(NULL)
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205 0, /*ob_size*/
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206 "md5.md5", /*tp_name*/
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207 sizeof(md5object), /*tp_size*/
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208 0, /*tp_itemsize*/
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209 /* methods */
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210 (destructor)md5_dealloc, /*tp_dealloc*/
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211 0, /*tp_print*/
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212 (getattrfunc)md5_getattr, /*tp_getattr*/
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213 0, /*tp_setattr*/
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214 0, /*tp_compare*/
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215 0, /*tp_repr*/
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216 0, /*tp_as_number*/
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217 0, /*tp_as_sequence*/
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218 0, /*tp_as_mapping*/
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219 0, /*tp_hash*/
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220 0, /*tp_call*/
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221 0, /*tp_str*/
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222 0, /*tp_getattro*/
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223 0, /*tp_setattro*/
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224 0, /*tp_as_buffer*/
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225 0, /*tp_xxx4*/
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226 md5type_doc, /*tp_doc*/
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227 };
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228
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229
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230 /* MD5 functions */
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231
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232 static PyObject *
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233 MD5_new(PyObject *self, PyObject *args)
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234 {
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235 md5object *md5p;
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236 unsigned char *cp = NULL;
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237 int len = 0;
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238
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239 if (!PyArg_ParseTuple(args, "|s#:new", &cp, &len))
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240 return NULL;
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241
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242 if ((md5p = newmd5object()) == NULL)
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243 return NULL;
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244
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245 if (cp)
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246 MD5Update(&md5p->md5, cp, len);
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247
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248 return (PyObject *)md5p;
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249 }
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250
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251 static char new_doc [] =
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252 "new([arg]) -> md5 object\n\
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253 \n\
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254 Return a new md5 object. If arg is present, the method call update(arg)\n\
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255 is made.";
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256
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257
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258 /* List of functions exported by this module */
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259
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260 static PyMethodDef md5_functions[] = {
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261 {"new", (PyCFunction)MD5_new, METH_VARARGS, new_doc},
3c0f75a2198f Use METH_VARARGS instead of numeric constant 1 in method def. tables
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262 {"md5", (PyCFunction)MD5_new, METH_VARARGS, new_doc}, /* Backward compatibility */
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263 {NULL, NULL} /* Sentinel */
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264 };
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265
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266
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267 /* Initialize this module. */
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268
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269 DL_EXPORT(void)
13651
8a063423e0b7 Bunch of minor ANSIfications: 'void initfunc()' -> 'void initfunc(void)',
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270 initmd5(void)
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271 {
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272 PyObject *m, *d;
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273
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274 MD5type.ob_type = &PyType_Type;
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275 m = Py_InitModule3("md5", md5_functions, module_doc);
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276 d = PyModule_GetDict(m);
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277 PyDict_SetItemString(d, "MD5Type", (PyObject *)&MD5type);
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278 PyModule_AddIntConstant(m, "digest_size", 16);
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279 /* No need to check the error here, the caller will do that */
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280 }