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 "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);
}

statichere 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 = 0;

	if (!newgetargs(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, 1},
	{"md5",		(method)MD5_new, 1}, /* Backward compatibility */
	{NULL,		NULL}	/* Sentinel */
};


/* Initialize this module. */

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