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sm2_encrypt_and_decrypt.h
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sm2_encrypt_and_decrypt.h
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/**************************************************
* File name: sm2_encrypt_and_decrypt.h
* Author: HAN Wei
* Author's blog: https://blog.csdn.net/henter/
* Date: Dec 8th, 2018
* Description: declare SM2 encrypt data and decrypt
ciphertext functions
**************************************************/
#ifndef HEADER_SM2_ENCRYPT_AND_DECRYPT_COMPUTATION_H
#define HEADER_SM2_ENCRYPT_AND_DECRYPT_COMPUTATION_H
#ifdef __cplusplus
extern "C" {
#endif
/**************************************************
* Name: sm2_encrypt_data_test
* Function: compute SM2 encryption with a fixed internal
random number k given in GM/T 0003.5-2012
* Parameters:
message[in] input message
message_len[in] input message length, size in bytes
pub_key[in] SM2 public key
c1[out] the first segment of ciphertext
c3[out] the middle segment of ciphertext
c2[out] the last segment of ciphertext
* Return value:
0: function executes successfully
any other value: an error occurs
* Notes:
1. This function is only used for testing! When a
ciphertext is created by invoking this function,
a fixed random number value k is used. The random
number value is given in GM/T 0003.5-2012.
2. "pub_key" is a octet string of 65 byte length. It
is a concatenation of 04 || X || Y. X and Y both are
SM2 public key coordinates of 32 byte length.
3. SM2 ciphertext is defined as a concatenation of
c1 || c3 || c2 in GM/T 0003.4-2012.
4. c1 is a octet string of 65 byte length. It is a
point on the elliptic curve. It is a concatenation
of 04 || X || Y. X and Y both are coordinates of
32 byte length.
5. c3 is a octet string of 32 byte length. It is a
SM3 digest value.
6. c2 is a octet string. Its length equals the length
of input message.
**************************************************/
int sm2_encrypt_data_test(const unsigned char *message,
const int message_len,
const unsigned char *pub_key,
unsigned char *c1,
unsigned char *c3,
unsigned char *c2);
/**************************************************
* Name: sm2_encrypt_data
* Function: compute SM2 encryption
* Parameters:
message[in] input message
message_len[in] input message length, size in bytes
pub_key[in] SM2 public key
c1[out] the first segment of ciphertext
c3[out] the middle segment of ciphertext
c2[out] the last segment of ciphertext
* Return value:
0: function executes successfully
any other value: an error occurs
* Notes:
1. pub_key is a octet string of 65 byte length. It
is a concatenation of 04 || X || Y. X and Y both are
SM2 public key coordinates of 32 byte length.
2. SM2 ciphertext is defined as a concatenation of
c1 || c3 || c2 in GM/T 0003.4-2012.
3. c1 is a octet string of 65 byte length. It is a
point on the elliptic curve. It is a concatenation
of 04 || X || Y. X and Y both are coordinates of
32 byte length.
4. c3 is a octet string of 32 byte length. It is a
SM3 digest value.
5. c2 is a octet string. Its length equals the length
of input message.
**************************************************/
int sm2_encrypt(const unsigned char *message,
const int message_len,
const unsigned char *pub_key,
unsigned char *c1,
unsigned char *c3,
unsigned char *c2);
/**************************************************
* Name: sm2_decrypt
* Function: decrypt SM2 ciphertext
* Parameters:
c1[in] the first segment of ciphertext
c3[in] the middle segment of ciphertext
c2[in] the last segment of ciphertext
c2_len[in] c2 length, size in bytes
pri_key[in] SM2 private key
plaintext[out] decrypted result
* Return value:
0: function executes successfully
any other value: an error occurs
* Notes:
1. SM2 ciphertext is defined as a concatenation of
c1 || c3 || c2 in GM/T 0003.4-2012.
2. c1 is a octet string of 65 byte length. It is a
point on the elliptic curve. It is a concatenation
of 04 || X || Y. X and Y both are coordinates of
32 byte length.
3. c3 is a octet string of 32 byte length. It is a
SM3 digest value.
4. c2 is a octet string. The length of plaintext is
equal to c2_len.
5. pri_key is a octet string of 32 byte length.
**************************************************/
int sm2_decrypt(const unsigned char *c1,
const unsigned char *c3,
const unsigned char *c2,
const int c2_len,
const unsigned char *pri_key,
unsigned char *plaintext);
#ifdef __cplusplus
}
#endif
#endif /* end of HEADER_SM2_ENCRYPT_AND_DECRYPT_COMPUTATION_H */