symbian-qemu-0.9.1-12/python-2.6.1/Modules/md5module.c
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
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/* MD5 module */
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/* This module provides an interface to the RSA Data Security,
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   Inc. MD5 Message-Digest Algorithm, described in RFC 1321.
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   It requires the files md5c.c and md5.h (which are slightly changed
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   from the versions in the RFC to avoid the "global.h" file.) */
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/* MD5 objects */
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#include "Python.h"
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#include "structmember.h"
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#include "md5.h"
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typedef struct {
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	PyObject_HEAD
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        md5_state_t	md5;		/* the context holder */
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} md5object;
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static PyTypeObject MD5type;
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#define is_md5object(v)		((v)->ob_type == &MD5type)
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static md5object *
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newmd5object(void)
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{
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	md5object *md5p;
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	md5p = PyObject_New(md5object, &MD5type);
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	if (md5p == NULL)
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		return NULL;
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	md5_init(&md5p->md5);	/* actual initialisation */
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	return md5p;
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}
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/* MD5 methods */
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static void
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md5_dealloc(md5object *md5p)
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{
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	PyObject_Del(md5p);
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}
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/* MD5 methods-as-attributes */
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static PyObject *
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md5_update(md5object *self, PyObject *args)
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{
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	unsigned char *cp;
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	int len;
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	if (!PyArg_ParseTuple(args, "s#:update", &cp, &len))
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		return NULL;
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	md5_append(&self->md5, cp, len);
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	Py_INCREF(Py_None);
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	return Py_None;
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}
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PyDoc_STRVAR(update_doc,
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"update (arg)\n\
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\n\
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Update the md5 object with the string arg. Repeated calls are\n\
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equivalent to a single call with the concatenation of all the\n\
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arguments.");
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static PyObject *
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md5_digest(md5object *self)
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{
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 	md5_state_t mdContext;
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	unsigned char aDigest[16];
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	/* make a temporary copy, and perform the final */
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	mdContext = self->md5;
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	md5_finish(&mdContext, aDigest);
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	return PyString_FromStringAndSize((char *)aDigest, 16);
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}
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PyDoc_STRVAR(digest_doc,
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"digest() -> string\n\
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\n\
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Return the digest of the strings passed to the update() method so\n\
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far. This is a 16-byte string which may contain non-ASCII characters,\n\
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including null bytes.");
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static PyObject *
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md5_hexdigest(md5object *self)
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{
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 	md5_state_t mdContext;
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	unsigned char digest[16];
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	unsigned char hexdigest[32];
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	int i, j;
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	/* make a temporary copy, and perform the final */
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	mdContext = self->md5;
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	md5_finish(&mdContext, digest);
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	/* Make hex version of the digest */
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	for(i=j=0; i<16; i++) {
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		char c;
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		c = (digest[i] >> 4) & 0xf;
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		c = (c>9) ? c+'a'-10 : c + '0';
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		hexdigest[j++] = c;
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		c = (digest[i] & 0xf);
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		c = (c>9) ? c+'a'-10 : c + '0';
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		hexdigest[j++] = c;
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	}
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	return PyString_FromStringAndSize((char*)hexdigest, 32);
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}
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PyDoc_STRVAR(hexdigest_doc,
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"hexdigest() -> string\n\
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\n\
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Like digest(), but returns the digest as a string of hexadecimal digits.");
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static PyObject *
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md5_copy(md5object *self)
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{
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	md5object *md5p;
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	if ((md5p = newmd5object()) == NULL)
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		return NULL;
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	md5p->md5 = self->md5;
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	return (PyObject *)md5p;
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}
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PyDoc_STRVAR(copy_doc,
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"copy() -> md5 object\n\
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\n\
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Return a copy (``clone'') of the md5 object.");
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static PyMethodDef md5_methods[] = {
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	{"update",    (PyCFunction)md5_update,    METH_VARARGS, update_doc},
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	{"digest",    (PyCFunction)md5_digest,    METH_NOARGS,  digest_doc},
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	{"hexdigest", (PyCFunction)md5_hexdigest, METH_NOARGS,  hexdigest_doc},
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	{"copy",      (PyCFunction)md5_copy,      METH_NOARGS,  copy_doc},
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	{NULL, NULL}			     /* sentinel */
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};
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static PyObject *
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md5_get_block_size(PyObject *self, void *closure)
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{
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    return PyInt_FromLong(64);
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}
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static PyObject *
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md5_get_digest_size(PyObject *self, void *closure)
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{
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    return PyInt_FromLong(16);
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}
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static PyObject *
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md5_get_name(PyObject *self, void *closure)
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{
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    return PyString_FromStringAndSize("MD5", 3);
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}
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static PyGetSetDef md5_getseters[] = {
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    {"digest_size",
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     (getter)md5_get_digest_size, NULL,
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     NULL,
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     NULL},
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   176
    {"block_size",
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     (getter)md5_get_block_size, NULL,
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     NULL,
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     NULL},
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   180
    {"name",
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   181
     (getter)md5_get_name, NULL,
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     NULL,
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   183
     NULL},
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   184
    /* the old md5 and sha modules support 'digest_size' as in PEP 247.
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   185
     * the old sha module also supported 'digestsize'.  ugh. */
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   186
    {"digestsize",
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   187
     (getter)md5_get_digest_size, NULL,
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   188
     NULL,
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   189
     NULL},
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   190
    {NULL}  /* Sentinel */
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diff changeset
   191
};
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   192
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   193
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   194
PyDoc_STRVAR(module_doc,
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   195
"This module implements the interface to RSA's MD5 message digest\n\
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   196
algorithm (see also Internet RFC 1321). Its use is quite\n\
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   197
straightforward: use the new() to create an md5 object. You can now\n\
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   198
feed this object with arbitrary strings using the update() method, and\n\
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   199
at any point you can ask it for the digest (a strong kind of 128-bit\n\
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   200
checksum, a.k.a. ``fingerprint'') of the concatenation of the strings\n\
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diff changeset
   201
fed to it so far using the digest() method.\n\
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   202
\n\
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   203
Functions:\n\
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   204
\n\
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   205
new([arg]) -- return a new md5 object, initialized with arg if provided\n\
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   206
md5([arg]) -- DEPRECATED, same as new, but for compatibility\n\
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   207
\n\
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   208
Special Objects:\n\
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   209
\n\
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   210
MD5Type -- type object for md5 objects");
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   211
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   212
PyDoc_STRVAR(md5type_doc,
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   213
"An md5 represents the object used to calculate the MD5 checksum of a\n\
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   214
string of information.\n\
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   215
\n\
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   216
Methods:\n\
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   217
\n\
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   218
update() -- updates the current digest with an additional string\n\
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diff changeset
   219
digest() -- return the current digest value\n\
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diff changeset
   220
hexdigest() -- return the current digest as a string of hexadecimal digits\n\
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   221
copy() -- return a copy of the current md5 object");
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   222
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   223
static PyTypeObject MD5type = {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   224
	PyVarObject_HEAD_INIT(NULL, 0)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   225
	"_md5.md5",		  /*tp_name*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   226
	sizeof(md5object),	  /*tp_size*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   227
	0,			  /*tp_itemsize*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   228
	/* methods */
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diff changeset
   229
	(destructor)md5_dealloc,  /*tp_dealloc*/
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diff changeset
   230
	0,			  /*tp_print*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   231
	0,                        /*tp_getattr*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   232
	0,			  /*tp_setattr*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   233
	0,			  /*tp_compare*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   234
	0,			  /*tp_repr*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   235
        0,			  /*tp_as_number*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   236
	0,                        /*tp_as_sequence*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   237
	0,			  /*tp_as_mapping*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   238
	0, 			  /*tp_hash*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   239
	0,			  /*tp_call*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   240
	0,			  /*tp_str*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   241
	0,			  /*tp_getattro*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   242
	0,			  /*tp_setattro*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   243
	0,	                  /*tp_as_buffer*/
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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	Py_TPFLAGS_DEFAULT,	  /*tp_flags*/
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	md5type_doc,		  /*tp_doc*/
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        0,                        /*tp_traverse*/
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        0,			  /*tp_clear*/
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        0,			  /*tp_richcompare*/
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        0,			  /*tp_weaklistoffset*/
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        0,			  /*tp_iter*/
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        0,			  /*tp_iternext*/
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        md5_methods,	          /*tp_methods*/
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        0,      	          /*tp_members*/
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        md5_getseters,            /*tp_getset*/
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};
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/* MD5 functions */
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static PyObject *
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MD5_new(PyObject *self, PyObject *args)
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{
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	md5object *md5p;
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	unsigned char *cp = NULL;
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	int len = 0;
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	if (!PyArg_ParseTuple(args, "|s#:new", &cp, &len))
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		return NULL;
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	if ((md5p = newmd5object()) == NULL)
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		return NULL;
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	if (cp)
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		md5_append(&md5p->md5, cp, len);
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	return (PyObject *)md5p;
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}
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PyDoc_STRVAR(new_doc,
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"new([arg]) -> md5 object\n\
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\n\
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Return a new md5 object. If arg is present, the method call update(arg)\n\
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is made.");
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/* List of functions exported by this module */
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static PyMethodDef md5_functions[] = {
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	{"new",		(PyCFunction)MD5_new, METH_VARARGS, new_doc},
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	{NULL,		NULL}	/* Sentinel */
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};
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/* Initialize this module. */
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PyMODINIT_FUNC
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init_md5(void)
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{
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	PyObject *m, *d;
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        Py_TYPE(&MD5type) = &PyType_Type;
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        if (PyType_Ready(&MD5type) < 0)
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            return;
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	m = Py_InitModule3("_md5", md5_functions, module_doc);
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	if (m == NULL)
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	    return;
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	d = PyModule_GetDict(m);
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	PyDict_SetItemString(d, "MD5Type", (PyObject *)&MD5type);
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	PyModule_AddIntConstant(m, "digest_size", 16);
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	/* No need to check the error here, the caller will do that */
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}