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/**
******************************************************************************
* @file bn.h
* @author MCD Application Team
* @version V3.0.0
* @date 05-June-2015
* @brief Basic Functions for Big Numbers (Multi Precision Integers)
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT 2015 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Image SW License Agreement V2, (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/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __CRL_BN_H__
#define __CRL_BN_H__
#ifdef __cplusplus
extern "C"
{
#endif
/** @ingroup BN
* @{
*/
/* Exported types ------------------------------------------------------------*/
/**
* @brief Structure used to store a BigNum_stt * integer.
*/
typedef struct
{
uint32_t *pmDigit; /*!< Used to represent the BigNum_stt * integer value; pmDigit[0] = least significant word. */
uint16_t mNumDigits; /*!< Number of significant words of the vector pmDigit used to represent the actual value. */
uint8_t mSize; /*!< Number of words allocated for the integer */
int8_t mSignFlag; /*!< Is the integer mSignFlag: SIGN_POSITIVE positive, SIGN_NEGATIVE negative. */
}
BigNum_stt;
/* Exported constants --------------------------------------------------------*/
#define NBIT_DIGIT 32u /*!< Bit Size of a BigNum digit (should equal to CPU word size, works for 32). */
#define MSBIT_MASK 0x80000000u /*!< Mask for the most significant bit in a digit */
#define MSBYTE_MASK 0xFF000000u /*!< Mask for the most significant byte in a digit */
#define LSBIT_MASK 0x00000001u /*!< Mask for the least significant bit in a digit */
#define MAX_DIGIT_VALUE 0xFFFFFFFFu /*!< Mask for all bit to 1 in a word */
#define SIGN_POSITIVE 0 /*!< Used to denote a positive Big Number. */
#define SIGN_NEGATIVE 1 /*!< Used to denote a negative Big Number. */
/* Exported functions ------------------------------------------------------- */
/* Big Number Operations ******************************************************/
/* Alloc big *****************************************************************/
int32_t StAllocBig(BigNum_stt **P_ppBignum, \
int32_t P_wordSize, \
membuf_stt *P_pMembuf);
/* StFree big ****************************************************************/
void StFreeBig (BigNum_stt **P_pBignum, \
membuf_stt *P_pMembuf);
/* x = initial_value. Sets the words x->pmDigit[1]_ _ _x->pmDigit[MAX_LEN_BIG-1] to 0. */
void InitBig (BigNum_stt * P_pBN, \
int32_t P_initialValue);
/* y=x. ***********************************************************************/
int32_t CopyBig (const BigNum_stt *P_pInputBN, \
BigNum_stt *P_pOutputBN);
/* Returns 1 if x==0, 0 otherwise. ********************************************/
int32_t IsZeroBig (const BigNum_stt *P_pInputBN);
/* x=0. ***********************************************************************/
void SetZeroBig (BigNum_stt * P_pInputBN);
/* Returns 1 if x>=0, returns 0 if x<0. ***************************************/
int32_t SignBig (const BigNum_stt *P_pInputBN);
int32_t EvenBig (const BigNum_stt *P_pBN);
/* Compares two BigNum_stt * integer. *****************************************/
int32_t CompareBig(const BigNum_stt *P_pInput1BN, \
const BigNum_stt *P_pInput2BN);
/* If x==0 returns 1. ********************************************************/
int32_t CountBits (const BigNum_stt *P_pInputBN);
int32_t CountBytes(const BigNum_stt * P_pInputBN);
/* Returns the value of the pos-th bit of x. **********************************/
uint16_t GiveBit (const BigNum_stt *P_pBN, \
uint32_t P_pos);
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /*__CRL_BN_H__*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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