Modules/md5module.c

/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI or Corporation for National Research Initiatives or
CNRI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.

While CWI is the initial source for this software, a modified version
is made available by the Corporation for National Research Initiatives
(CNRI) at the Internet address ftp://ftp.python.org.

STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.

******************************************************************/

/* MD5 module */

/* This module provides an interface to the RSA Data Security,
   Inc. MD5 Message-Digest Algorithm, described in RFC 1321.
   It requires the files md5c.c and md5.h (which are slightly changed
   from the versions in the RFC to avoid the "global.h" file.) */


/* MD5 objects */

#include "Python.h"
#include "md5.h"

typedef struct {
	PyObject_HEAD
        MD5_CTX	md5;		/* the context holder */
} md5object;

staticforward PyTypeObject MD5type;

#define is_md5object(v)		((v)->ob_type == &MD5type)

static md5object *
newmd5object()
{
	md5object *md5p;

	md5p = PyObject_NEW(md5object, &MD5type);
	if (md5p == NULL)
		return NULL;

	MD5Init(&md5p->md5);	/* actual initialisation */
	return md5p;
}


/* MD5 methods */

static void
md5_dealloc(md5p)
	md5object *md5p;
{
	PyMem_DEL(md5p);
}


/* MD5 methods-as-attributes */

static PyObject *
md5_update(self, args)
	md5object *self;
	PyObject *args;
{
	unsigned char *cp;
	int len;

	if (!PyArg_Parse(args, "s#", &cp, &len))
		return NULL;

	MD5Update(&self->md5, cp, len);

	Py_INCREF(Py_None);
	return Py_None;
}

static PyObject *
md5_digest(self, args)
	md5object *self;
	PyObject *args;
{

	MD5_CTX mdContext;
	unsigned char aDigest[16];

	if (!PyArg_NoArgs(args))
		return NULL;

	/* make a temporary copy, and perform the final */
	mdContext = self->md5;
	MD5Final(aDigest, &mdContext);

	return PyString_FromStringAndSize((char *)aDigest, 16);
}

static PyObject *
md5_copy(self, args)
	md5object *self;
	PyObject *args;
{
	md5object *md5p;

	if (!PyArg_NoArgs(args))
		return NULL;

	if ((md5p = newmd5object()) == NULL)
		return NULL;

	md5p->md5 = self->md5;

	return (PyObject *)md5p;
}

static PyMethodDef md5_methods[] = {
	{"update",		(PyCFunction)md5_update},
	{"digest",		(PyCFunction)md5_digest},
	{"copy",		(PyCFunction)md5_copy},
	{NULL,			NULL}		/* sentinel */
};

static PyObject *
md5_getattr(self, name)
	md5object *self;
	char *name;
{
	return Py_FindMethod(md5_methods, (PyObject *)self, name);
}

statichere PyTypeObject MD5type = {
	PyObject_HEAD_INIT(&PyType_Type)
	0,			  /*ob_size*/
	"md5",			  /*tp_name*/
	sizeof(md5object),	  /*tp_size*/
	0,			  /*tp_itemsize*/
	/* methods */
	(destructor)md5_dealloc,  /*tp_dealloc*/
	0,			  /*tp_print*/
	(getattrfunc)md5_getattr, /*tp_getattr*/
	0,			  /*tp_setattr*/
	0,			  /*tp_compare*/
	0,			  /*tp_repr*/
        0,			  /*tp_as_number*/
};


/* MD5 functions */

static PyObject *
MD5_new(self, args)
	PyObject *self;
	PyObject *args;
{
	md5object *md5p;
	unsigned char *cp = NULL;
	int len = 0;

	if (!PyArg_ParseTuple(args, "|s#", &cp, &len))
		return NULL;

	if ((md5p = newmd5object()) == NULL)
		return NULL;

	if (cp)
		MD5Update(&md5p->md5, cp, len);

	return (PyObject *)md5p;
}


/* List of functions exported by this module */

static PyMethodDef md5_functions[] = {
	{"new",		(PyCFunction)MD5_new, 1},
	{"md5",		(PyCFunction)MD5_new, 1}, /* Backward compatibility */
	{NULL,		NULL}	/* Sentinel */
};


/* Initialize this module. */

void
initmd5()
{
	(void)Py_InitModule("md5", md5_functions);
}