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/*
** Copyright 1996-2001 by Letterror: Just van Rossum, The Netherlands.
**
** Open source.
**
** Module implementing the eexec and charstring encryption algorithm as
** used by PostScript Type 1 fonts.
**
*/
#include "Python.h"
#include <ctype.h>
static PyObject *ErrorObject;
/* ----------------------------------------------------- */
static char eexec_decrypt__doc__[] =
""
;
static PyObject *
eexec_decrypt(PyObject *self, PyObject *args)
{
PyObject *_res = NULL;
unsigned short R;
int tempR; /* can't portably use unsigned shorts between Python versions */
unsigned short c1 = 52845;
unsigned short c2 = 22719;
unsigned char * inbuf;
unsigned char * outbuf;
unsigned long counter, insize;
if (!PyArg_ParseTuple(args, "s#i", &inbuf, &insize, &tempR))
return NULL;
R = (unsigned short)tempR;
if ((outbuf = malloc(insize)) == NULL)
{
PyErr_NoMemory();
return NULL;
}
for(counter = 0;counter < insize; counter++) {
outbuf[counter] = (inbuf[counter] ^ (R>>8));
R = (inbuf[counter] + R) * c1 + c2;
}
_res = Py_BuildValue("s#l", outbuf, insize, (unsigned long)R);
free(outbuf);
return _res;
}
static char eexec_encrypt__doc__[] =
""
;
static PyObject *
eexec_encrypt(PyObject *self, PyObject *args)
{
PyObject *_res = NULL;
unsigned short R;
int tempR; /* can't portably use unsigned shorts between Python versions */
unsigned short c1 = 52845;
unsigned short c2 = 22719;
unsigned char * inbuf;
unsigned char * outbuf;
unsigned long counter, insize;
if (!PyArg_ParseTuple(args, "s#i", &inbuf, &insize, &tempR))
return NULL;
R = (unsigned short)tempR;
if ((outbuf = malloc(insize)) == NULL)
{
PyErr_NoMemory();
return NULL;
}
for(counter = 0;counter < insize; counter++) {
outbuf[counter] = (inbuf[counter] ^ (R>>8));
R = (outbuf[counter] + R) * c1 + c2;
}
_res = Py_BuildValue("s#l", outbuf, insize, (unsigned long)R);
free(outbuf);
return _res;
}
static char eexec_hexString__doc__[] =
""
;
static PyObject *
eexec_hexString(PyObject *self, PyObject *args)
{
PyObject *_res = NULL;
unsigned char * inbuf;
unsigned char * outbuf;
static const unsigned char hexchars[] = "0123456789ABCDEF";
unsigned long i, insize;
if (!PyArg_ParseTuple(args, "s#", &inbuf, &insize))
return NULL;
outbuf = malloc(2 * insize);
if (outbuf == NULL) {
PyErr_NoMemory();
return NULL;
}
for (i = 0; i < insize; i++) {
outbuf[2 * i] = hexchars[(inbuf[i] >> 4) & 0xF];
outbuf[2 * i + 1] = hexchars[inbuf[i] & 0xF];
}
_res = Py_BuildValue("s#", outbuf, 2 * insize);
free(outbuf);
return _res;
}
#define HEX2DEC(c) ((c) >= 'A' ? ((c) - 'A' + 10) : ((c) - '0'))
static char eexec_deHexString__doc__[] =
""
;
static PyObject *
eexec_deHexString(PyObject *self, PyObject *args)
{
PyObject *_res = NULL;
unsigned char * inbuf;
unsigned char * outbuf;
unsigned char c1, c2;
unsigned long insize, i;
if (!PyArg_ParseTuple(args, "s#", &inbuf, &insize))
return NULL;
if (insize % 2) {
PyErr_SetString(ErrorObject, "hex string must have even length");
return NULL;
}
outbuf = malloc(insize / 2);
if (outbuf == NULL) {
PyErr_NoMemory();
return NULL;
}
for ( i = 0; i < insize; i += 2) {
c1 = toupper(inbuf[i]);
c2 = toupper(inbuf[i+1]);
if (!isxdigit(c1) || !isxdigit(c1)) {
PyErr_SetString(ErrorObject, "non-hex character found");
goto error;
}
outbuf[i/2] = (HEX2DEC(c2)) | (HEX2DEC(c1) << 4);
}
_res = Py_BuildValue("s#", outbuf, insize / 2);
error:
free(outbuf);
return _res;
}
/* List of methods defined in the module */
static struct PyMethodDef eexec_methods[] = {
{"decrypt", (PyCFunction)eexec_decrypt, METH_VARARGS, eexec_decrypt__doc__},
{"encrypt", (PyCFunction)eexec_encrypt, METH_VARARGS, eexec_encrypt__doc__},
{"hexString", (PyCFunction)eexec_hexString, METH_VARARGS, eexec_hexString__doc__},
{"deHexString", (PyCFunction)eexec_deHexString, METH_VARARGS, eexec_deHexString__doc__},
{NULL, (PyCFunction)NULL, 0, NULL} /* sentinel */
};
/* Initialization function for the module (*must* be called initeexec) */
static char eexec_module_documentation[] =
""
;
void initeexecOp(void); /* prototype to shut up the compiler */
void initeexecOp(void)
{
PyObject *m, *d;
/* Create the module and add the functions */
m = Py_InitModule4("eexecOp", eexec_methods,
eexec_module_documentation,
(PyObject*)NULL,PYTHON_API_VERSION);
/* Add some symbolic constants to the module */
d = PyModule_GetDict(m);
ErrorObject = PyString_FromString("eexec.error");
PyDict_SetItemString(d, "error", ErrorObject);
/* Check for errors */
if (PyErr_Occurred())
Py_FatalError("can't initialize module eexec");
}
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