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/**
******************************************************************************
* @file arith.h
* @author MCD Application Team
* @brief Basic Arithmetic Functions for Big Numbers (Multi Precision Integers)
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2015 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under Image license SLA0044,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* http://www.st.com/SLA0044
*
******************************************************************************
*/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __CRL_ARITH_H__
#define __CRL_ARITH_H__
#ifdef __cplusplus
extern "C"
{
#endif
/* Includes ------------------------------------------------------------------*/
#include "bn.h"
/** @ingroup Arith
* @{
*/
/* Exported functions ------------------------------------------------------- */
/* z=x+y.**********************************************************************/
int32_t AddBig (const BigNum_stt *P_pAddend1BN, \
const BigNum_stt *P_pAddend2BN, \
BigNum_stt *P_pSumBN, \
membuf_stt *P_pMemBuf);
/* z=x-y. *********************************************************************/
int32_t SubBig (const BigNum_stt *P_pMinuendBN, \
const BigNum_stt *P_pSubtrahendBN, \
BigNum_stt * P_pDifferenceBN, \
membuf_stt *P_pMemBuf);
/* x=x<<1.
* Left shift of 1 bit. */
int32_t FastMul2 (BigNum_stt *P_pBN);
void FastDiv2 (BigNum_stt *P_pBN);
/* x=x<<(esp words). Left shift of esp words. ********************************/
int32_t FastMulInnerBase (BigNum_stt *P_pBN, \
uint16_t P_exp);
/* x=x>>(esp words). Right shift of esp words. *******************************/
void FastDivInnerBase (BigNum_stt * P_pBN, \
uint16_t P_exp);
/* x=x<<shift. Left shift of 'shift' bits. Condition: 0<shift<32. *************/
int32_t LeftShift (BigNum_stt * P_pBN, \
uint32_t P_shift);
\
void RightShift (BigNum_stt *P_pBN, \
uint32_t P_shift);
/* x=x*y. *********************************************************************/
int32_t MulBigbyUnInt (BigNum_stt *P_pBN, \
uint32_t P_factor2);
\
/* Core Subtraction function, the signs are not used. P_difference = |P_minuend| - |P_subtrahend| */
int32_t Sub_Moduli_Big (const BigNum_stt *P_pMinuendBN, \
const BigNum_stt *P_pSubtrahendBN, \
BigNum_stt *P_pDifferenceBN);
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /*__CRL_BIG_H__*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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