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/*
* _counter.h: Fast counter for use with CTR-mode ciphers
*
* Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net>
*
* ===================================================================
* The contents of this file are dedicated to the public domain. To
* the extent that dedication to the public domain is not available,
* everyone is granted a worldwide, perpetual, royalty-free,
* non-exclusive license to exercise all rights associated with the
* contents of this file for any purpose whatsoever.
* No rights are reserved.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* ===================================================================
*/
#ifndef PCT__COUNTER_H
#define PCT__COUNTER_H
#include "pycrypto_common.h"
#define PCT_CTR_ABI_VERSION 1 /* Bump this whenever the structure below changes */
typedef struct {
PyObject_HEAD
PyBytesObject *prefix; /* Prefix (useful for a nonce) */
PyBytesObject *suffix; /* Suffix (useful for a nonce) */
uint8_t *val; /* Buffer for our output string */
Py_ssize_t buf_size;/* Size of the buffer */
uint8_t *p; /* Pointer to the part of the buffer that we're allowed to update */
uint16_t nbytes; /* The number of bytes that from .p that are part of the counter */
void (*inc_func)(void *); /* Pointer to the counter increment function */
int carry; /* This gets set by Counter*Object_increment when the counter wraps around */
int allow_wraparound; /* When this is false, we raise OverflowError on next_value() or __call__() when the counter wraps around */
} PCT_CounterObject;
#endif /* PCT__COUNTER_H */
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