c++ 调用sha2-256编码的示例代码

#include 
#include 
#include 

#pragma comment(lib, "Crypt32.lib")

int main() {
    HCRYPTPROV hProv = NULL;
    HCRYPTHASH hHash = NULL;
    BYTE data[] = "Hello, SHA-256!"; // 数据的示例

    // 获取一个加密服务提供者的句柄
    if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
        std::cerr << "Error in CryptAcquireContext: " << GetLastError() << std::endl;
        return 1;
    }

    // 创建一个哈希对象
    if (!CryptCreateHash(hProv, CALG_SHA_256, 0, 0, &hHash)) {
        std::cerr << "Error in CryptCreateHash: " << GetLastError() << std::endl;
        CryptReleaseContext(hProv, 0);
        return 1;
    }

    // 向哈希对象输入数据
    if (!CryptHashData(hHash, data, sizeof(data) - 1, 0)) {
        std::cerr << "Error in CryptHashData: " << GetLastError() << std::endl;
        CryptDestroyHash(hHash);
        CryptReleaseContext(hProv, 0);
        return 1;
    }

    // 获取哈希值
    BYTE hashValue[32]; // SHA-256 哈希值是 32 字节长度
    DWORD hashSize = sizeof(hashValue);
    if (!CryptGetHashParam(hHash, HP_HASHVAL, hashValue, &hashSize, 0)) {
        std::cerr << "Error in CryptGetHashParam: " << GetLastError() << std::endl;
    } else {
        std::cout << "SHA-256 Hash Value: ";
        for (int i = 0; i < sizeof(hashValue); i++) {
            printf("%02x", hashValue[i]);
        }
        std::cout << std::endl;
    }

    // 清理资源
    CryptDestroyHash(hHash);
    CryptReleaseContext(hProv, 0);

    return 0;
}