cpython/Modules/md5module.c

/***********************************************************
Copyright 1991, 1992, 1993, 1994 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 not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior permission.

STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM 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 "allobjects.h"
#include "modsupport.h"

#include "md5.h"

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

staticforward typeobject MD5type;

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

static md5object *
newmd5object()
{
	md5object *md5p;

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

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


/* MD5 methods */

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


/* MD5 methods-as-attributes */

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

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

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

	INCREF(None);
	return None;
}

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

	MD5_CTX mdContext;
	unsigned char aDigest[16];

	if (!getnoarg(args))
		return NULL;

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

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

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

	if (!getnoarg(args))
		return NULL;

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

	md5p->md5 = self->md5;

	return (object *)md5p;
}

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

static object *
md5_getattr(self, name)
	md5object *self;
	char *name;
{
	return findmethod(md5_methods, (object *)self, name);
}

static typeobject MD5type = {
	OB_HEAD_INIT(&Typetype)
	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 object *
MD5_new(self, args)
	object *self;
	object *args;
{
	md5object *md5p;
	unsigned char *cp = NULL;
	int len;

	if (!getargs(args, "")) {
		err_clear();
		if (!getargs(args, "s#", &cp, &len))
			return NULL;
	}

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

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

	return (object *)md5p;
}


/* List of functions exported by this module */

static struct methodlist md5_functions[] = {
	{"new",			(method)MD5_new},
	{"md5",			(method)MD5_new}, /* Backward compatibility */
	{NULL,			NULL}		 /* Sentinel */
};


/* Initialize this module. */

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