68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/*
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* Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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#ifndef GMSSL_SM2_ELGAMAL_H
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#define GMSSL_SM2_ELGAMAL_H
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#include <string.h>
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#include <stdint.h>
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#include <gmssl/sm2.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SM2_PRE_COMPUTE_MAX_OFFSETS 6
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typedef struct {
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uint16_t offset[SM2_PRE_COMPUTE_MAX_OFFSETS];
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uint8_t offset_count;
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uint8_t x_coordinate[32];
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} SM2_PRE_COMPUTE;
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int sm2_elgamal_decrypt_pre_compute(SM2_PRE_COMPUTE table[1<<16]);
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int sm2_elgamal_solve_ecdlp(const SM2_PRE_COMPUTE table[1<<16], const SM2_POINT *point, uint32_t *private);
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typedef struct {
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SM2_POINT C1;
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SM2_POINT C2;
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} SM2_ELGAMAL_CIPHERTEXT;
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int sm2_elgamal_do_encrypt(const SM2_KEY *pub_key, uint32_t in, SM2_ELGAMAL_CIPHERTEXT *out);
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int sm2_elgamal_do_decrypt(const SM2_KEY *key, const SM2_ELGAMAL_CIPHERTEXT *in, uint32_t *out);
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int sm2_elgamal_ciphertext_add(SM2_ELGAMAL_CIPHERTEXT *r,
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const SM2_ELGAMAL_CIPHERTEXT *a,
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const SM2_ELGAMAL_CIPHERTEXT *b,
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const SM2_KEY *pub_key);
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int sm2_elgamal_cipehrtext_sub(SM2_ELGAMAL_CIPHERTEXT *r,
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const SM2_ELGAMAL_CIPHERTEXT *a, const SM2_ELGAMAL_CIPHERTEXT *b,
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const SM2_KEY *pub_key);
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int sm2_elgamal_cipehrtext_neg(SM2_ELGAMAL_CIPHERTEXT *r,
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const SM2_ELGAMAL_CIPHERTEXT *a, const SM2_KEY *pub_key);
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int sm2_elgamal_ciphertext_scalar_mul(SM2_ELGAMAL_CIPHERTEXT *R,
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const uint8_t scalar[32], const SM2_ELGAMAL_CIPHERTEXT *A,
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const SM2_KEY *pub_key);
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int sm2_elgamal_ciphertext_to_der(const SM2_ELGAMAL_CIPHERTEXT *c, uint8_t **out, size_t *outlen);
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int sm2_elgamal_ciphertext_from_der(SM2_ELGAMAL_CIPHERTEXT *c, const uint8_t **in, size_t *inlen);
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int sm2_elgamal_encrypt(const SM2_KEY *pub_key, uint32_t in, uint8_t *out, size_t *outlen);
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int sm2_elgamal_decrypt(SM2_KEY *key, const uint8_t *in, size_t inlen, uint32_t *out);
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#ifdef __cplusplus
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}
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#endif
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#endif
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