crypt_elgamal.h

/*
 * This file is part of the openHiTLS project.
 *
 * openHiTLS is licensed under the Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *
 *     http://license.coscl.org.cn/MulanPSL2
 *
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */
 
#ifndef CRYPT_ELGAMAL_H
#define CRYPT_ELGAMAL_H
 
#include "hitls_build.h"
#ifdef HITLS_CRYPTO_ELGAMAL
 
#include <stdlib.h>
#include <stdint.h>
#include "crypt_bn.h"
#include "crypt_local_types.h"
#include "bsl_params.h"
 
#ifdef __cplusplus
extern "C" {
#endif /* __cpluscplus */
 
#define ELGAMAL_MAX_MODULUS_BITS 16384
 
/* ElGamal*/
typedef struct ELGAMAL_Ctx CRYPT_ELGAMAL_Ctx;
typedef struct ELGAMAL_Para CRYPT_ELGAMAL_Para;
 
/* ElGamal method*/
CRYPT_ELGAMAL_Ctx *CRYPT_ELGAMAL_NewCtx(void);
 
CRYPT_ELGAMAL_Ctx *CRYPT_ELGAMAL_NewCtxEx(void *libCtx);

CRYPT_ELGAMAL_Ctx *CRYPT_ELGAMAL_DupCtx(CRYPT_ELGAMAL_Ctx *keyCtx);

CRYPT_ELGAMAL_Para *CRYPT_ELGAMAL_NewPara(const CRYPT_ElGamalPara *para);

void CRYPT_ELGAMAL_FreeCtx(CRYPT_ELGAMAL_Ctx *ctx);

void CRYPT_ELGAMAL_FreePara(CRYPT_ELGAMAL_Para *para);

int32_t CRYPT_ELGAMAL_SetPara(CRYPT_ELGAMAL_Ctx *ctx, const CRYPT_ElGamalPara *para);
 
#ifdef HITLS_BSL_PARAMS
int32_t CRYPT_ELGAMAL_SetParaEx(CRYPT_ELGAMAL_Ctx *ctx, const BSL_Param *para);
#endif

uint32_t CRYPT_ELGAMAL_GetBits(const CRYPT_ELGAMAL_Ctx *ctx);

uint32_t CRYPT_ELGAMAL_GetKBits(const CRYPT_ELGAMAL_Ctx *ctx);

int32_t CRYPT_ELGAMAL_Gen(CRYPT_ELGAMAL_Ctx *ctx);

int32_t CRYPT_ELGAMAL_PubEnc(const CRYPT_ELGAMAL_Ctx *ctx, const uint8_t *input, uint32_t inputLen, uint8_t *out1,
                             uint32_t *out1Len, uint8_t *out2, uint32_t *out2Len);

int32_t CRYPT_ELGAMAL_PrvDec(const CRYPT_ELGAMAL_Ctx *ctx, const BN_BigNum *c1, const BN_BigNum *c2, uint32_t bits,
                             uint8_t *out, uint32_t *outLen);

int32_t CRYPT_ELGAMAL_SetPrvKey(CRYPT_ELGAMAL_Ctx *ctx, const CRYPT_ElGamalPrv *prv);

int32_t CRYPT_ELGAMAL_SetPubKey(CRYPT_ELGAMAL_Ctx *ctx, const CRYPT_ElGamalPub *pub);

int32_t CRYPT_ELGAMAL_GetPrvKey(const CRYPT_ELGAMAL_Ctx *ctx, CRYPT_ElGamalPrv *prv);

int32_t CRYPT_ELGAMAL_GetPubKey(const CRYPT_ELGAMAL_Ctx *ctx, CRYPT_ElGamalPub *pub);
 
#ifdef HITLS_BSL_PARAMS
int32_t CRYPT_ELGAMAL_SetPrvKeyEx(CRYPT_ELGAMAL_Ctx *ctx, const BSL_Param *para);

int32_t CRYPT_ELGAMAL_SetPubKeyEx(CRYPT_ELGAMAL_Ctx *ctx, const BSL_Param *para);

int32_t CRYPT_ELGAMAL_GetPrvKeyEx(const CRYPT_ELGAMAL_Ctx *ctx, BSL_Param *para);

int32_t CRYPT_ELGAMAL_GetPubKeyEx(const CRYPT_ELGAMAL_Ctx *ctx, BSL_Param *para);
#endif

int32_t CRYPT_ELGAMAL_Encrypt(CRYPT_ELGAMAL_Ctx *ctx, const uint8_t *data, uint32_t dataLen, uint8_t *out,
                              uint32_t *outLen);

int32_t CRYPT_ELGAMAL_Decrypt(CRYPT_ELGAMAL_Ctx *ctx, const uint8_t *data, uint32_t dataLen, uint8_t *out,
                              uint32_t *outLen);

int32_t CRYPT_ELGAMAL_GetSecBits(const CRYPT_ELGAMAL_Ctx *ctx);

int32_t CRYPT_ELGAMAL_Ctrl(CRYPT_ELGAMAL_Ctx *ctx, int32_t opt, void *val, uint32_t len);
 
#ifdef HITLS_CRYPTO_ELGAMAL
int32_t OriginalRoot(void *libCtx, BN_BigNum *g, const BN_BigNum *p, const BN_BigNum *q, uint32_t bits);
#endif
 
#ifdef _cplusplus
}
#endif
 
#endif // HITLS_CRYPTO_ELGAMAL
#endif // CRYPT_ELGAMAL_H