Mercurial > cpython-lru_cache-weakref

annotate Modules/md5module.c @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 4d36e56b56d9
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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11
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12 #include "Python.h"
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13 #include "structmember.h"
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14 #include "md5.h"
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16 typedef struct {
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17 PyObject_HEAD
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18 md5_state_t md5; /* the context holder */
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19 } md5object;
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20
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21 static PyTypeObject MD5type;
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23 #define is_md5object(v) ((v)->ob_type == &MD5type)
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24
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25 static md5object *
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26 newmd5object(void)
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27 {
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28 md5object *md5p;
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30 md5p = PyObject_New(md5object, &MD5type);
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31 if (md5p == NULL)
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32 return NULL;
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33
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34 md5_init(&md5p->md5); /* actual initialisation */
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35 return md5p;
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36 }
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39 /* MD5 methods */
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40
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41 static void
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42 md5_dealloc(md5object *md5p)
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43 {
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44 PyObject_Del(md5p);
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45 }
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47
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48 /* MD5 methods-as-attributes */
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49
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50 static PyObject *
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51 md5_update(md5object *self, PyObject *args)
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52 {
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53 Py_buffer view;
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54 Py_ssize_t n;
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55 unsigned char *buf;
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56
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57 if (!PyArg_ParseTuple(args, "s*:update", &view))
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58 return NULL;
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59
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60 n = view.len;
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61 buf = (unsigned char *) view.buf;
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62 while (n > 0) {
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63 Py_ssize_t nbytes;
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64 if (n > INT_MAX)
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65 nbytes = INT_MAX;
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66 else
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67 nbytes = n;
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68 md5_append(&self->md5, buf,
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69 Py_SAFE_DOWNCAST(nbytes, Py_ssize_t, unsigned int));
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70 buf += nbytes;
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71 n -= nbytes;
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72 }
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73
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74 PyBuffer_Release(&view);
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75 Py_RETURN_NONE;
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76 }
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77
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78 PyDoc_STRVAR(update_doc,
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79 "update (arg)\n\
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80 \n\
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81 Update the md5 object with the string arg. Repeated calls are\n\
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82 equivalent to a single call with the concatenation of all the\n\
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83 arguments.");
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84
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85
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86 static PyObject *
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87 md5_digest(md5object *self)
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88 {
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89 md5_state_t mdContext;
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90 unsigned char aDigest[16];
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91
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92 /* make a temporary copy, and perform the final */
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93 mdContext = self->md5;
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94 md5_finish(&mdContext, aDigest);
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95
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96 return PyString_FromStringAndSize((char *)aDigest, 16);
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97 }
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98
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99 PyDoc_STRVAR(digest_doc,
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100 "digest() -> string\n\
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101 \n\
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102 Return the digest of the strings passed to the update() method so\n\
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103 far. This is a 16-byte string which may contain non-ASCII characters,\n\
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104 including null bytes.");
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105
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106
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107 static PyObject *
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108 md5_hexdigest(md5object *self)
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109 {
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110 md5_state_t mdContext;
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111 unsigned char digest[16];
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112 unsigned char hexdigest[32];
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113 int i, j;
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114
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115 /* make a temporary copy, and perform the final */
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116 mdContext = self->md5;
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117 md5_finish(&mdContext, digest);
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118
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119 /* Make hex version of the digest */
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120 for(i=j=0; i<16; i++) {
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121 char c;
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122 c = (digest[i] >> 4) & 0xf;
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123 c = (c>9) ? c+'a'-10 : c + '0';
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124 hexdigest[j++] = c;
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125 c = (digest[i] & 0xf);
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126 c = (c>9) ? c+'a'-10 : c + '0';
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127 hexdigest[j++] = c;
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128 }
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129 return PyString_FromStringAndSize((char*)hexdigest, 32);
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130 }
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131
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132
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133 PyDoc_STRVAR(hexdigest_doc,
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134 "hexdigest() -> string\n\
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135 \n\
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136 Like digest(), but returns the digest as a string of hexadecimal digits.");
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137
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138
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139 static PyObject *
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140 md5_copy(md5object *self)
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141 {
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142 md5object *md5p;
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143
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144 if ((md5p = newmd5object()) == NULL)
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145 return NULL;
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146
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147 md5p->md5 = self->md5;
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148
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149 return (PyObject *)md5p;
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150 }
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151
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152 PyDoc_STRVAR(copy_doc,
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153 "copy() -> md5 object\n\
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154 \n\
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155 Return a copy (``clone'') of the md5 object.");
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156
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157
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158 static PyMethodDef md5_methods[] = {
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159 {"update", (PyCFunction)md5_update, METH_VARARGS, update_doc},
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160 {"digest", (PyCFunction)md5_digest, METH_NOARGS, digest_doc},
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161 {"hexdigest", (PyCFunction)md5_hexdigest, METH_NOARGS, hexdigest_doc},
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162 {"copy", (PyCFunction)md5_copy, METH_NOARGS, copy_doc},
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163 {NULL, NULL} /* sentinel */
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164 };
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165
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166 static PyObject *
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167 md5_get_block_size(PyObject *self, void *closure)
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168 {
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169 return PyInt_FromLong(64);
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170 }
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171
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172 static PyObject *
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173 md5_get_digest_size(PyObject *self, void *closure)
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174 {
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175 return PyInt_FromLong(16);
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176 }
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177
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178 static PyObject *
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179 md5_get_name(PyObject *self, void *closure)
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180 {
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181 return PyString_FromStringAndSize("MD5", 3);
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182 }
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183
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184 static PyGetSetDef md5_getseters[] = {
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185 {"digest_size",
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186 (getter)md5_get_digest_size, NULL,
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187 NULL,
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188 NULL},
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189 {"block_size",
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190 (getter)md5_get_block_size, NULL,
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191 NULL,
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192 NULL},
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193 {"name",
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194 (getter)md5_get_name, NULL,
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195 NULL,
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196 NULL},
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197 /* the old md5 and sha modules support 'digest_size' as in PEP 247.
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198 * the old sha module also supported 'digestsize'. ugh. */
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199 {"digestsize",
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200 (getter)md5_get_digest_size, NULL,
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201 NULL,
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202 NULL},
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203 {NULL} /* Sentinel */
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204 };
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205
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206
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207 PyDoc_STRVAR(module_doc,
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208 "This module implements the interface to RSA's MD5 message digest\n\
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209 algorithm (see also Internet RFC 1321). Its use is quite\n\
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210 straightforward: use the new() to create an md5 object. You can now\n\
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211 feed this object with arbitrary strings using the update() method, and\n\
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212 at any point you can ask it for the digest (a strong kind of 128-bit\n\
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213 checksum, a.k.a. ``fingerprint'') of the concatenation of the strings\n\
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214 fed to it so far using the digest() method.\n\
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215 \n\
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216 Functions:\n\
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217 \n\
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218 new([arg]) -- return a new md5 object, initialized with arg if provided\n\
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219 md5([arg]) -- DEPRECATED, same as new, but for compatibility\n\
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220 \n\
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221 Special Objects:\n\
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222 \n\
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223 MD5Type -- type object for md5 objects");
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224
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225 PyDoc_STRVAR(md5type_doc,
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226 "An md5 represents the object used to calculate the MD5 checksum of a\n\
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227 string of information.\n\
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228 \n\
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229 Methods:\n\
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230 \n\
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231 update() -- updates the current digest with an additional string\n\
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232 digest() -- return the current digest value\n\
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233 hexdigest() -- return the current digest as a string of hexadecimal digits\n\
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234 copy() -- return a copy of the current md5 object");
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235
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236 static PyTypeObject MD5type = {
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237 PyVarObject_HEAD_INIT(NULL, 0)
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238 "_md5.md5", /*tp_name*/
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239 sizeof(md5object), /*tp_size*/
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240 0, /*tp_itemsize*/
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241 /* methods */
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242 (destructor)md5_dealloc, /*tp_dealloc*/
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243 0, /*tp_print*/
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244 0, /*tp_getattr*/
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245 0, /*tp_setattr*/
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246 0, /*tp_compare*/
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247 0, /*tp_repr*/
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248 0, /*tp_as_number*/
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249 0, /*tp_as_sequence*/
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250 0, /*tp_as_mapping*/
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251 0, /*tp_hash*/
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252 0, /*tp_call*/
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253 0, /*tp_str*/
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254 0, /*tp_getattro*/
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255 0, /*tp_setattro*/
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256 0, /*tp_as_buffer*/
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257 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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258 md5type_doc, /*tp_doc*/
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259 0, /*tp_traverse*/
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260 0, /*tp_clear*/
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261 0, /*tp_richcompare*/
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262 0, /*tp_weaklistoffset*/
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263 0, /*tp_iter*/
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264 0, /*tp_iternext*/
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265 md5_methods, /*tp_methods*/
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266 0, /*tp_members*/
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267 md5_getseters, /*tp_getset*/
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268 };
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269
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270
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271 /* MD5 functions */
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272
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273 static PyObject *
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274 MD5_new(PyObject *self, PyObject *args)
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275 {
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276 md5object *md5p;
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277 Py_buffer view = { 0 };
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278 Py_ssize_t n;
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279 unsigned char *buf;
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280
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281 if (!PyArg_ParseTuple(args, "|s*:new", &view))
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282 return NULL;
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283
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284 if ((md5p = newmd5object()) == NULL) {
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285 PyBuffer_Release(&view);
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286 return NULL;
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287 }
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288
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289 n = view.len;
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290 buf = (unsigned char *) view.buf;
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291 while (n > 0) {
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292 Py_ssize_t nbytes;
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293 if (n > INT_MAX)
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294 nbytes = INT_MAX;
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295 else
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296 nbytes = n;
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297 md5_append(&md5p->md5, buf,
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298 Py_SAFE_DOWNCAST(nbytes, Py_ssize_t, unsigned int));
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299 buf += nbytes;
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300 n -= nbytes;
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301 }
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302 PyBuffer_Release(&view);
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303
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304 return (PyObject *)md5p;
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305 }
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306
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307 PyDoc_STRVAR(new_doc,
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308 "new([arg]) -> md5 object\n\
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309 \n\
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310 Return a new md5 object. If arg is present, the method call update(arg)\n\
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311 is made.");
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312
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313
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314 /* List of functions exported by this module */
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315
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316 static PyMethodDef md5_functions[] = {
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317 {"new", (PyCFunction)MD5_new, METH_VARARGS, new_doc},
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318 {NULL, NULL} /* Sentinel */
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319 };
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320
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321
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322 /* Initialize this module. */
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323
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324 PyMODINIT_FUNC
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325 init_md5(void)
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326 {
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327 PyObject *m, *d;
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328
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329 Py_TYPE(&MD5type) = &PyType_Type;
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330 if (PyType_Ready(&MD5type) < 0)
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331 return;
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332 m = Py_InitModule3("_md5", md5_functions, module_doc);
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333 if (m == NULL)
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334 return;
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335 d = PyModule_GetDict(m);
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336 PyDict_SetItemString(d, "MD5Type", (PyObject *)&MD5type);
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337 PyModule_AddIntConstant(m, "digest_size", 16);
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338 /* No need to check the error here, the caller will do that */
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339 }