typedef struct Struct_ECCCIPHERBLOB {
BYTE XCoordinate[ECC_MAX_XCOORDINATE_BITS_LEN/8];
BYTE YCoordinate[ECC_MAX_XCOORDINATE_BITS_LEN/8];
BYTE HASH[32];
ULONG CipherLen;
BYTE Cipher[1];
} ECCCIPHERBLOB, *PECCCIPHERBLOB;
typedef struct SKF_ENVELOPEDKEYBLOB {
ULONG Version;
ULONG ulSymmAlgID;
ULONG ulBits;
BYTE cbEncryptedPriKey[64];
ECCPUBLICKEYBLOB PubKey;
ECCCIPHERBLOB ECCCipherBlob;
} ENVELOPEDKEYBLOB, *PENVELOPEDKEYBLOB;
这个ECC加密密钥对保护结构怎么生成， 有例子吗。
该回答通过自己思路及引用到GPTᴼᴾᴱᴺᴬᴵ搜索,得到内容具体如下：
生成 GMT 0016 ECC 加密密钥对保护结构需要进行以下步骤：
生成 ECC 密钥对。可以使用 OpenSSL 等工具库生成 ECC 密钥对，具体生成方法可以参考对应库的文档。
使用 SHA-256 算法对 ECC 公钥进行哈希运算，生成 32 字节的 HASH 值。
使用 ECC 公钥加密对称密钥，得到密文。
将 ECC 公钥和密文组成 ECCCIPHERBLOB 结构体。
将生成的 ECCCIPHERBLOB 结构体和加密后的私钥组成 SKF_ENVELOPEDKEYBLOB 结构体。
以下是一个 C 语言示例代码，演示了如何生成 SKF_ENVELOPEDKEYBLOB 结构体：
#include <stdio.h>
#include <string.h>
#include <openssl/ec.h>
#include <openssl/evp.h>
#include <openssl/sha.h>
#define ECC_MAX_XCOORDINATE_BITS_LEN 256
typedef struct Struct_ECCCIPHERBLOB {
BYTE XCoordinate[ECC_MAX_XCOORDINATE_BITS_LEN/8];
BYTE YCoordinate[ECC_MAX_XCOORDINATE_BITS_LEN/8];
BYTE HASH[32];
ULONG CipherLen;
BYTE Cipher[1];
} ECCCIPHERBLOB, *PECCCIPHERBLOB;
typedef struct SKF_ENVELOPEDKEYBLOB {
ULONG Version;
ULONG ulSymmAlgID;
ULONG ulBits;
BYTE cbEncryptedPriKey[64];
ECCPUBLICKEYBLOB PubKey;
ECCCIPHERBLOB ECCCipherBlob;
} ENVELOPEDKEYBLOB, *PENVELOPEDKEYBLOB;
int generate_ecc_key_pair(EC_KEY **ecc_key, ECCPUBLICKEYBLOB *ecc_pubkey)
{
int ret = 0;
EC_GROUP *group = NULL;
EC_POINT *pubkey_point = NULL;
unsigned char *pubkey_buf = NULL;
int pubkey_len = 0;
// 创建 ECC 密钥对
group = EC_GROUP_new_by_curve_name(NID_sm2);
if (group == NULL) {
printf("Error creating EC group\n");
ret = 1;
goto cleanup;
}
*ecc_key = EC_KEY_new();
if (*ecc_key == NULL) {
printf("Error creating EC key\n");
ret = 1;
goto cleanup;
}
if (EC_KEY_set_group(*ecc_key, group) != 1) {
printf("Error setting EC group\n");
ret = 1;
goto cleanup;
}
if (EC_KEY_generate_key(*ecc_key) != 1) {
printf("Error generating EC key\n");
ret = 1;
goto cleanup;
}
// 获取 ECC 公钥
pubkey_point = EC_KEY_get0_public_key(*ecc_key);
pubkey_len = EC_POINT_point2oct(group, pubkey_point,
POINT_CONVERSION_UNCOMPRESSED,
NULL, 0, NULL);
if (pubkey_len <= 0) {
printf("Error getting public key length\n");
ret = 1;
goto cleanup;
}
pubkey_buf = (unsigned char *) malloc(pubkey_len);
if (pubkey_buf == NULL) {
printf("Error allocating memory for public key\n");
ret = 1;
goto cleanup;
}
if (EC_POINT_point2oct(group, pubkey_point,
POINT_CONVERSION_UNCOMPRESSED,
pubkey_buf, pubkey_len, NULL) != pubkey_len) {
printf("Error getting public key\n");
ret = 1;
goto cleanup;
}
// 填充 ECC 公钥结构体
ecc_pubkey->BitLen = pubkey_len * 8;
ecc_pubkey->XCoordinateLen = pubkey_len / 2;
ecc_pubkey->YCoordinateLen = pubkey_len / 2;
memcpy(ecc_pubkey->XCoordinate, pubkey_buf, ecc_pubkey->XCoordinateLen);
memcpy(ecc_pubkey->YCoordinate, pubkey_buf + ecc_pubkey->XCoordinateLen, ecc_pubkey->YCoordinateLen);
cleanup:
if (pubkey_buf != NULL) {
free(pubkey_buf);
}
if (group != NULL) {
EC_GROUP_free(group);
}
return ret;
}
int ecc_encrypt(unsigned char *plaintext, int plaintext_len,
EC_KEY *ecc_key, ECCCIPHERBLOB **ecc_cipherblob)
{
int ret = 0;
EC_GROUP *group = NULL;
EC_POINT *pubkey_point = NULL;
unsigned char *pubkey_buf = NULL;
int pubkey_len = 0;
EVP_PKEY *pkey = NULL;
EVP_PKEY_CTX *ctx = NULL;
size_t cipher_len = 0;
unsigned char *cipher_buf = NULL;
int xcoord_len = 0;
int ycoord_len = 0;
int ecc_cipherblob_len = 0;
// 获取 ECC 公钥
group = EC_KEY_get0_group(ecc_key);
pubkey_point = EC_KEY_get0_public_key(ecc_key);
pubkey_len = EC_POINT_point2oct(group, pubkey_point,
POINT_CONVERSION_UNCOMPRESSED,
NULL, 0, NULL);
if (pubkey_len <= 0) {
printf("Error getting public key length\n");
ret = 1;
goto cleanup;
}
pubkey_buf = (unsigned char *) malloc(pubkey_len);
if (pubkey_buf == NULL) {
printf("Error allocating memory for public key\n");
ret = 1;
goto cleanup;
}
if (EC_POINT_point2oct(group, pubkey_point,
POINT_CONVERSION_UNCOMPRESSED,
pubkey_buf, pubkey_len, NULL) != pubkey_len) {
printf("Error getting public key\n");
ret = 1;
goto cleanup;
}
// 使用 ECC 公钥加密对称密钥
pkey = EVP_PKEY_new_raw_public_key(EVP_PKEY_EC, NULL, pubkey_buf, pubkey_len);
if (pkey == NULL) {
printf("Error creating EVP_PKEY\n");
ret = 1;
goto cleanup;
}
ctx = EVP_PKEY_CTX_new(pkey, NULL);
if (ctx == NULL) {
printf("Error creating EVP_PKEY_CTX\n");
ret = 1;
goto cleanup;
}
if (EVP_PKEY_encrypt_init(ctx) <= 0) {
printf("Error initializing EVP_PKEY_CTX\n");
ret = 1;
goto cleanup;
}
if (EVP_PKEY_CTX_ctrl(ctx, -1, EVP_PKEY_OP_ENCRYPT,
EVP_PKEY_CTRL_EC_PADDING, ECIES_DEFAULT_PADDING, NULL) <= 0) {
printf("Error setting EVP_PKEY_CTRL_EC_PADDING\n");
ret = 1;
goto cleanup;
}
if (EVP_PKEY_encrypt(ctx, NULL, &cipher_len, plaintext, plaintext_len) <= 0) {
printf("Error getting cipher length\n");
ret = 1;
goto cleanup;
}
cipher_buf = (unsigned char *) malloc(cipher_len);
if (cipher_buf == NULL) {
printf("Error allocating memory for cipher\n");
ret = 1;
goto cleanup;
}
if (EVP_PKEY_encrypt(ctx, cipher_buf, &cipher_len, plaintext, plaintext_len) <= 0) {
printf("Error encrypting data\n");
ret = 1;
goto cleanup;
}
// 填充 ECCCIPHERBLOB 结构体
*ecc_cipherblob = (ECCCIPHERBLOB *) malloc(sizeof(ECCCIPHERBLOB) + cipher_len - 1);
if (*ecc_cipherblob == NULL) {
printf("Error allocating memory for ECCCIPHERBLOB\n");
ret = 1;
goto cleanup;
}
SHA256(pubkey_buf, pubkey_len, (*ecc_cipherblob)->HASH);
(*ecc_cipherblob)->CipherLen = cipher_len;
memcpy((*ecc_cipherblob)->Cipher, cipher_buf, cipher_len);
xcoord_len = ecc_pubkey->XCoordinateLen;
ycoord_len = ecc_pubkey->YCoordinateLen;
memcpy((*ecc_cipherblob)->XCoordinate, ecc_pubkey->XCoordinate, xcoord_len);
memcpy((*ecc_cipherblob)->YCoordinate, ecc_pubkey->YCoordinate, ycoord_len);
ecc_cipherblob_len = sizeof(ECCCIPHERBLOB) + cipher_len - 1;
(*ecc_cipherblob)->XCoordinate[0] |= 0x80;
(*ecc_cipherblob)->YCoordinate[0] |= 0x80;
cleanup:
if (pubkey_buf != NULL) {
free(pubkey_buf);
}
if (pkey != NULL) {
EVP_PKEY_free(pkey);
}
if (ctx != NULL) {
EVP_PKEY_CTX_free(ctx);
}
if (cipher_buf != NULL) {
free(cipher_buf);
}
return ret;
}
int generate_enveloped_key_blob(EC_KEY *ecc_key, char *encrypted_prikey,
ECCPUBLICKEYBLOB *ecc_pubkey, ENVELOPEDKEYBLOB **enveloped_key_blob)
{
int ret =int ecc_cipherblob_len = 0;
ECCCIPHERBLOB *ecc_cipherblob = NULL;
// 生成 ECCCIPHERBLOB 结构体
ret = ecc_encrypt((unsigned char *)symmetric_key, symmetric_key_len, ecc_key, &ecc_cipherblob);
if (ret != 0) {
printf("Error encrypting symmetric key\n");
goto cleanup;
}
ecc_cipherblob_len = sizeof(ECCCIPHERBLOB) + ecc_cipherblob->CipherLen - 1;
// 填充 SKF_ENVELOPEDKEYBLOB 结构体
*enveloped_key_blob = (ENVELOPEDKEYBLOB *) malloc(sizeof(ENVELOPEDKEYBLOB));
if (*enveloped_key_blob == NULL) {
printf("Error allocating memory for ENVELOPEDKEYBLOB\n");
ret = 1;
goto cleanup;
}
memset(*enveloped_key_blob, 0, sizeof(ENVELOPEDKEYBLOB));
(*enveloped_key_blob)->Version = 1;
(*enveloped_key_blob)->ulSymmAlgID = SGD_SM4_CBC;
(*enveloped_key_blob)->ulBits = symmetric_key_len * 8;
memcpy((*enveloped_key_blob)->cbEncryptedPriKey, encrypted_prikey, 64);
memcpy(&((*enveloped_key_blob)->PubKey), ecc_pubkey, sizeof(ECCPUBLICKEYBLOB));
memcpy(&((*enveloped_key_blob)->ECCCipherBlob), ecc_cipherblob, ecc_cipherblob_len);
cleanup:
if (ecc_cipherblob != NULL) {
free(ecc_cipherblob);
}
return ret;
}
使用时，可以先调用 generate_ecc_key_pair 函数生成 ECC 密钥对，然后调用 generate_enveloped_key_blob 函数生成 SKF_ENVELOPEDKEYBLOB 结构体，其中 symmetric_key 表示要保护的对称密钥，symmetric_key_len 表示对称密钥的长度，encrypted_prikey 表示加密后的私钥。最终生成的 SKF_ENVELOPEDKEYBLOB 结构体可以用于加密数据时的密钥保护。
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