1 2/* MD5 module */ 3 4/* This module provides an interface to the RSA Data Security, 5 Inc. MD5 Message-Digest Algorithm, described in RFC 1321. 6 It requires the files md5c.c and md5.h (which are slightly changed 7 from the versions in the RFC to avoid the "global.h" file.) */ 8 9 10/* MD5 objects */ 11 12#include "Python.h" 13#include "structmember.h" 14#include "md5.h" 15 16typedef struct { 17 PyObject_HEAD 18 md5_state_t md5; /* the context holder */ 19} md5object; 20 21static PyTypeObject MD5type; 22 23#define is_md5object(v) ((v)->ob_type == &MD5type) 24 25static md5object * 26newmd5object(void) 27{ 28 md5object *md5p; 29 30 md5p = PyObject_New(md5object, &MD5type); 31 if (md5p == NULL) 32 return NULL; 33 34 md5_init(&md5p->md5); /* actual initialisation */ 35 return md5p; 36} 37 38 39/* MD5 methods */ 40 41static void 42md5_dealloc(md5object *md5p) 43{ 44 PyObject_Del(md5p); 45} 46 47 48/* MD5 methods-as-attributes */ 49 50static PyObject * 51md5_update(md5object *self, PyObject *args) 52{ 53 Py_buffer view; 54 55 if (!PyArg_ParseTuple(args, "s*:update", &view)) 56 return NULL; 57 58 md5_append(&self->md5, (unsigned char*)view.buf, 59 Py_SAFE_DOWNCAST(view.len, Py_ssize_t, unsigned int)); 60 61 PyBuffer_Release(&view); 62 Py_RETURN_NONE; 63} 64 65PyDoc_STRVAR(update_doc, 66"update (arg)\n\ 67\n\ 68Update the md5 object with the string arg. Repeated calls are\n\ 69equivalent to a single call with the concatenation of all the\n\ 70arguments."); 71 72 73static PyObject * 74md5_digest(md5object *self) 75{ 76 md5_state_t mdContext; 77 unsigned char aDigest[16]; 78 79 /* make a temporary copy, and perform the final */ 80 mdContext = self->md5; 81 md5_finish(&mdContext, aDigest); 82 83 return PyString_FromStringAndSize((char *)aDigest, 16); 84} 85 86PyDoc_STRVAR(digest_doc, 87"digest() -> string\n\ 88\n\ 89Return the digest of the strings passed to the update() method so\n\ 90far. This is a 16-byte string which may contain non-ASCII characters,\n\ 91including null bytes."); 92 93 94static PyObject * 95md5_hexdigest(md5object *self) 96{ 97 md5_state_t mdContext; 98 unsigned char digest[16]; 99 unsigned char hexdigest[32]; 100 int i, j; 101 102 /* make a temporary copy, and perform the final */ 103 mdContext = self->md5; 104 md5_finish(&mdContext, digest); 105 106 /* Make hex version of the digest */ 107 for(i=j=0; i<16; i++) { 108 char c; 109 c = (digest[i] >> 4) & 0xf; 110 c = (c>9) ? c+'a'-10 : c + '0'; 111 hexdigest[j++] = c; 112 c = (digest[i] & 0xf); 113 c = (c>9) ? c+'a'-10 : c + '0'; 114 hexdigest[j++] = c; 115 } 116 return PyString_FromStringAndSize((char*)hexdigest, 32); 117} 118 119 120PyDoc_STRVAR(hexdigest_doc, 121"hexdigest() -> string\n\ 122\n\ 123Like digest(), but returns the digest as a string of hexadecimal digits."); 124 125 126static PyObject * 127md5_copy(md5object *self) 128{ 129 md5object *md5p; 130 131 if ((md5p = newmd5object()) == NULL) 132 return NULL; 133 134 md5p->md5 = self->md5; 135 136 return (PyObject *)md5p; 137} 138 139PyDoc_STRVAR(copy_doc, 140"copy() -> md5 object\n\ 141\n\ 142Return a copy (``clone'') of the md5 object."); 143 144 145static PyMethodDef md5_methods[] = { 146 {"update", (PyCFunction)md5_update, METH_VARARGS, update_doc}, 147 {"digest", (PyCFunction)md5_digest, METH_NOARGS, digest_doc}, 148 {"hexdigest", (PyCFunction)md5_hexdigest, METH_NOARGS, hexdigest_doc}, 149 {"copy", (PyCFunction)md5_copy, METH_NOARGS, copy_doc}, 150 {NULL, NULL} /* sentinel */ 151}; 152 153static PyObject * 154md5_get_block_size(PyObject *self, void *closure) 155{ 156 return PyInt_FromLong(64); 157} 158 159static PyObject * 160md5_get_digest_size(PyObject *self, void *closure) 161{ 162 return PyInt_FromLong(16); 163} 164 165static PyObject * 166md5_get_name(PyObject *self, void *closure) 167{ 168 return PyString_FromStringAndSize("MD5", 3); 169} 170 171static PyGetSetDef md5_getseters[] = { 172 {"digest_size", 173 (getter)md5_get_digest_size, NULL, 174 NULL, 175 NULL}, 176 {"block_size", 177 (getter)md5_get_block_size, NULL, 178 NULL, 179 NULL}, 180 {"name", 181 (getter)md5_get_name, NULL, 182 NULL, 183 NULL}, 184 /* the old md5 and sha modules support 'digest_size' as in PEP 247. 185 * the old sha module also supported 'digestsize'. ugh. */ 186 {"digestsize", 187 (getter)md5_get_digest_size, NULL, 188 NULL, 189 NULL}, 190 {NULL} /* Sentinel */ 191}; 192 193 194PyDoc_STRVAR(module_doc, 195"This module implements the interface to RSA's MD5 message digest\n\ 196algorithm (see also Internet RFC 1321). Its use is quite\n\ 197straightforward: use the new() to create an md5 object. You can now\n\ 198feed this object with arbitrary strings using the update() method, and\n\ 199at any point you can ask it for the digest (a strong kind of 128-bit\n\ 200checksum, a.k.a. ``fingerprint'') of the concatenation of the strings\n\ 201fed to it so far using the digest() method.\n\ 202\n\ 203Functions:\n\ 204\n\ 205new([arg]) -- return a new md5 object, initialized with arg if provided\n\ 206md5([arg]) -- DEPRECATED, same as new, but for compatibility\n\ 207\n\ 208Special Objects:\n\ 209\n\ 210MD5Type -- type object for md5 objects"); 211 212PyDoc_STRVAR(md5type_doc, 213"An md5 represents the object used to calculate the MD5 checksum of a\n\ 214string of information.\n\ 215\n\ 216Methods:\n\ 217\n\ 218update() -- updates the current digest with an additional string\n\ 219digest() -- return the current digest value\n\ 220hexdigest() -- return the current digest as a string of hexadecimal digits\n\ 221copy() -- return a copy of the current md5 object"); 222 223static PyTypeObject MD5type = { 224 PyVarObject_HEAD_INIT(NULL, 0) 225 "_md5.md5", /*tp_name*/ 226 sizeof(md5object), /*tp_size*/ 227 0, /*tp_itemsize*/ 228 /* methods */ 229 (destructor)md5_dealloc, /*tp_dealloc*/ 230 0, /*tp_print*/ 231 0, /*tp_getattr*/ 232 0, /*tp_setattr*/ 233 0, /*tp_compare*/ 234 0, /*tp_repr*/ 235 0, /*tp_as_number*/ 236 0, /*tp_as_sequence*/ 237 0, /*tp_as_mapping*/ 238 0, /*tp_hash*/ 239 0, /*tp_call*/ 240 0, /*tp_str*/ 241 0, /*tp_getattro*/ 242 0, /*tp_setattro*/ 243 0, /*tp_as_buffer*/ 244 Py_TPFLAGS_DEFAULT, /*tp_flags*/ 245 md5type_doc, /*tp_doc*/ 246 0, /*tp_traverse*/ 247 0, /*tp_clear*/ 248 0, /*tp_richcompare*/ 249 0, /*tp_weaklistoffset*/ 250 0, /*tp_iter*/ 251 0, /*tp_iternext*/ 252 md5_methods, /*tp_methods*/ 253 0, /*tp_members*/ 254 md5_getseters, /*tp_getset*/ 255}; 256 257 258/* MD5 functions */ 259 260static PyObject * 261MD5_new(PyObject *self, PyObject *args) 262{ 263 md5object *md5p; 264 Py_buffer view = { 0 }; 265 266 if (!PyArg_ParseTuple(args, "|s*:new", &view)) 267 return NULL; 268 269 if ((md5p = newmd5object()) == NULL) { 270 PyBuffer_Release(&view); 271 return NULL; 272 } 273 274 if (view.len > 0) { 275 md5_append(&md5p->md5, (unsigned char*)view.buf, 276 Py_SAFE_DOWNCAST(view.len, Py_ssize_t, unsigned int)); 277 } 278 PyBuffer_Release(&view); 279 280 return (PyObject *)md5p; 281} 282 283PyDoc_STRVAR(new_doc, 284"new([arg]) -> md5 object\n\ 285\n\ 286Return a new md5 object. If arg is present, the method call update(arg)\n\ 287is made."); 288 289 290/* List of functions exported by this module */ 291 292static PyMethodDef md5_functions[] = { 293 {"new", (PyCFunction)MD5_new, METH_VARARGS, new_doc}, 294 {NULL, NULL} /* Sentinel */ 295}; 296 297 298/* Initialize this module. */ 299 300PyMODINIT_FUNC 301init_md5(void) 302{ 303 PyObject *m, *d; 304 305 Py_TYPE(&MD5type) = &PyType_Type; 306 if (PyType_Ready(&MD5type) < 0) 307 return; 308 m = Py_InitModule3("_md5", md5_functions, module_doc); 309 if (m == NULL) 310 return; 311 d = PyModule_GetDict(m); 312 PyDict_SetItemString(d, "MD5Type", (PyObject *)&MD5type); 313 PyModule_AddIntConstant(m, "digest_size", 16); 314 /* No need to check the error here, the caller will do that */ 315} 316