# md4c.tcl - Copyright (C) 2003 Pat Thoyts <[email protected]>
#
# This provides a C implementation of MD4 using the sample code from RFC1320
# and wrapping this up in a Tcl package.
#
# The tcl interface code is based upon the md5c code from critcl by JCW.
#
# INSTALLATION
# ------------
# This package uses critcl (http://wiki.tcl.tk/critcl). To build do:
# critcl -libdir <your-tcl-lib-dir> -pkg md4c md4c
#
# $Id: md4c.tcl,v 1.4 2004/01/15 06:36:13 andreas_kupries Exp $
package require critcl
package provide md4c 1.0.0
critcl::cheaders md4.h
critcl::csources md4.c
namespace eval ::md4 {
critcl::ccode {
#include "md4.h"
/*
* define a Tcl object type for the MD4 state
*/
static Tcl_ObjType md4_type;
static void md4_free_rep(Tcl_Obj *obj)
{
MD4_CTX *ctx = (MD4_CTX *)obj->internalRep.otherValuePtr;
Tcl_Free((char *)ctx);
}
static void md4_dup_rep(Tcl_Obj *obj, Tcl_Obj *dup)
{
MD4_CTX *ctx = (MD4_CTX *)obj->internalRep.otherValuePtr;
dup->internalRep.otherValuePtr = (MD4_CTX *)Tcl_Alloc(sizeof(MD4_CTX));
memcpy(dup->internalRep.otherValuePtr, ctx, sizeof(MD4_CTX));
dup->typePtr = &md4_type;
}
static void md4_string_rep(Tcl_Obj* obj)
{
unsigned char buf[16];
Tcl_Obj* temp;
char* str;
MD4_CTX *dup = (MD4_CTX *)obj->internalRep.otherValuePtr;
MD4Final(buf, dup);
/* convert via a byte array to properly handle null bytes */
temp = Tcl_NewByteArrayObj(buf, sizeof buf);
Tcl_IncrRefCount(temp);
str = Tcl_GetStringFromObj(temp, &obj->length);
obj->bytes = Tcl_Alloc(obj->length + 1);
memcpy(obj->bytes, str, obj->length + 1);
Tcl_DecrRefCount(temp);
}
static int md4_from_any(Tcl_Interp* interp, Tcl_Obj* obj)
{
/* assert(0); */
return TCL_ERROR;
}
static Tcl_ObjType md4_type = {
"md4c", md4_free_rep, md4_dup_rep, md4_string_rep, md4_from_any
};
}
critcl::ccommand md4c {dummy interp objc objv} {
MD4_CTX *ctx;
unsigned char* data;
int size;
Tcl_Obj* obj;
/* Tcl_RegisterObjType(&md4_type); */
if (objc < 2 || objc > 3) {
Tcl_WrongNumArgs(interp, 1, objv, "data ?context?");
return TCL_ERROR;
}
if (objc == 3) {
if (objv[2]->typePtr != &md4_type
&& md4_from_any(interp, objv[2]) != TCL_OK)
return TCL_ERROR;
obj = objv[2];
if (Tcl_IsShared(obj))
obj = Tcl_DuplicateObj(obj);
} else {
obj = Tcl_NewObj();
ctx = (MD4_CTX *)Tcl_Alloc(sizeof(MD4_CTX));
MD4Init(ctx);
if (obj->typePtr != NULL && obj->typePtr->freeIntRepProc != NULL)
obj->typePtr->freeIntRepProc(obj);
obj->internalRep.otherValuePtr = ctx;
obj->typePtr = &md4_type;
}
Tcl_SetObjResult(interp, obj);
Tcl_IncrRefCount(obj); //!! huh?
Tcl_InvalidateStringRep(obj);
ctx = (MD4_CTX *)obj->internalRep.otherValuePtr;
data = Tcl_GetByteArrayFromObj(objv[1], &size);
MD4Update(ctx, data, size);
return TCL_OK;
}
}
# Local variables:
# mode: tcl
# indent-tabs-mode: nil
# End:
