sm2_crypt.verify
时间: 2023-09-23 11:12:18 浏览: 46
sm2_crypt.verify 是一个函数,用于验证 SM2 签名算法生成的数字签名是否有效。SM2 是一种国密算法,用于椭圆曲线数字签名算法。该函数需要传入以下参数:
- pubkey:SM2 公钥
- msg:待验证的消息
- signature:SM2 数字签名
函数会返回一个布尔值,表示数字签名是否有效。如果返回 True,则表示签名有效;如果返回 False,则表示签名无效。
请注意,由于你没有提供更多的上下文信息,我无法提供更详细的回答。如果你有任何进一步的问题,请随时提问!
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int main(int argc, char *argv[]) { ec_param *ecp; sm2_ec_key *key_B; message_st message_data; int type = TYPE_GFp; int point_bit_length = 256; char **sm2_param = sm2_param_recommand; ecp = ec_param_new(); ec_param_init(ecp, sm2_param, type, point_bit_length); key_B = sm2_ec_key_new(ecp); sm2_ec_key_init(key_B, sm2_param_d_B[ecp->type], ecp); memset(&message_data, 0, sizeof(message_data)); sm2_hex2bin((BYTE *)sm2_param_k[ecp->type], message_data.k, ecp->point_byte_length); sm2_bn2bin(key_B->d, message_data.private_key, ecp->point_byte_length); sm2_bn2bin(key_B->P->x, message_data.public_key.x, ecp->point_byte_length); sm2_bn2bin(key_B->P->y, message_data.public_key.y, ecp->point_byte_length); message_data.decrypt = (BYTE *)OPENSSL_malloc(message_data.message_byte_length + 1); memset(message_data.decrypt, 0, message_data.message_byte_length + 1); BIGNUM *P_x; BIGNUM *P_y; //BIGNUM *d; BIGNUM *k; xy_ecpoint *P; xy_ecpoint *xy1; xy_ecpoint *xy2; int pos1; BYTE t; int i; sm2_hash local_C_3; P_x = BN_new(); P_y = BN_new(); k = BN_new(); P = xy_ecpoint_new(ecp); xy1 = xy_ecpoint_new(ecp); xy2 = xy_ecpoint_new(ecp); BN_bin2bn(message_data.public_key.x, ecp->point_byte_length, P_x); BN_bin2bn(message_data.public_key.y, ecp->point_byte_length, P_y); BN_bin2bn(message_data.k, ecp->point_byte_length, k); xy_ecpoint_init_xy(P, P_x, P_y, ecp); xy_ecpoint_mul_bignum(xy1, ecp->G, k, ecp); xy_ecpoint_mul_bignum(xy2, P, k, ecp); char cryptstring[1024]; scanf("%s", cryptstring); / 利用函数sm2_hex2bin将16进制字符串cryptstring转换成二进制流填充到message_data.C里 / / 计算明文长度 message_data.message_byte_length */ message_data.klen_bit = message_data.message_byte_length * 8;(请根据注释补充)
以下是补充完整的代码:
```c
int main(int argc, char *argv[]) {
ec_param *ecp;
sm2_ec_key *key_B;
message_st message_data;
int type = TYPE_GFp;
int point_bit_length = 256;
char **sm2_param = sm2_param_recommand;
ecp = ec_param_new();
ec_param_init(ecp, sm2_param, type, point_bit_length);
key_B = sm2_ec_key_new(ecp);
sm2_ec_key_init(key_B, sm2_param_d_B[ecp->type], ecp);
memset(&message_data, 0, sizeof(message_data));
sm2_hex2bin((BYTE *)sm2_param_k[ecp->type], message_data.k, ecp->point_byte_length);
sm2_bn2bin(key_B->d, message_data.private_key, ecp->point_byte_length);
sm2_bn2bin(key_B->P->x, message_data.public_key.x, ecp->point_byte_length);
sm2_bn2bin(key_B->P->y, message_data.public_key.y, ecp->point_byte_length);
message_data.decrypt = (BYTE *)OPENSSL_malloc(message_data.message_byte_length + 1);
memset(message_data.decrypt, 0, message_data.message_byte_length + 1);
BIGNUM *P_x;
BIGNUM *P_y;
BIGNUM *k;
xy_ecpoint *P;
xy_ecpoint *xy1;
xy_ecpoint *xy2;
int pos1;
BYTE t;
int i;
sm2_hash local_C_3;
P_x = BN_new();
P_y = BN_new();
k = BN_new();
P = xy_ecpoint_new(ecp);
xy1 = xy_ecpoint_new(ecp);
xy2 = xy_ecpoint_new(ecp);
BN_bin2bn(message_data.public_key.x, ecp->point_byte_length, P_x);
BN_bin2bn(message_data.public_key.y, ecp->point_byte_length, P_y);
BN_bin2bn(message_data.k, ecp->point_byte_length, k);
xy_ecpoint_init_xy(P, P_x, P_y, ecp);
xy_ecpoint_mul_bignum(xy1, ecp->G, k, ecp);
xy_ecpoint_mul_bignum(xy2, P, k, ecp);
char cryptstring[1024];
scanf("%s", cryptstring);
sm2_hex2bin((BYTE *)cryptstring, message_data.C, sizeof(message_data.C));
// 计算明文长度
message_data.message_byte_length = message_data.klen_bit / 8;
// 进行解密操作
pos1 = 0;
sm2_init_hash(ecp->type, &local_C_3);
for (i = 0; i < message_data.message_byte_length; i++) {
if (pos1 == ecp->point_byte_length * 2) {
xy_ecpoint_mul_bignum(xy1, xy2, ecp->one_time_pad, ecp);
pos1 = 0;
}
message_data.decrypt[i] = (BYTE)(message_data.C[i] ^ xy1->x[pos1]);
sm2_update_hash(&local_C_3, &message_data.decrypt[i], 1);
pos1++;
}
message_data.decrypt[i] = '\0';
// 输出解密后的明文
printf("解密:%s\n", message_data.decrypt);
return 0;
}
```
在上述代码中,我们使用 `scanf` 函数从标准输入中读取需要解密的密文,并使用 `sm2_hex2bin` 函数将其转换为二进制流填充到 `message_data.C` 字段中。然后,我们根据密文长度计算出明文长度,并进行解密操作,最终输出解密后的明文。
SM2CurveUtils.SM2_CURVE
SM2CurveUtils.SM2_CURVE refers to the elliptic curve used in the SM2 cryptographic algorithm. The SM2 algorithm is a widely used cryptographic algorithm in China, and is based on the elliptic curve cryptography (ECC) algorithm. The SM2 curve is defined as follows:
- Field: GF(p), where p is a large prime number (256-bit or 512-bit)
- Curve equation: y^2 = x^3 + ax + b (mod p), where a and b are constants chosen to satisfy certain properties (e.g., being non-zero and not equal to each other)
- Base point: a specific point on the curve that is used as a starting point for cryptographic operations
The SM2 curve has been chosen carefully to provide strong security properties while also being efficient to compute on. It is designed to resist various attacks, such as the elliptic curve discrete logarithm problem (ECDLP) and the side-channel attacks. The SM2 algorithm is used in various applications, such as digital signatures, key exchange, and encryption.