cpython/Modules/md5module.c

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

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/* 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);
}