- duplicate attribute: :key

你好！对于您提到的问题，"duplicate attribute: :key"，这个错误通常出现在编程中，意味着您定义的对象或元素中存在重复的键（key）。在编程中，键用于唯一标识对象或元素。

要解决这个问题，您可以检查您的代码，确保在定义对象或元素时，每个键都是唯一的。如果您在同一个对象或元素中多次使用相同的键，就会出现这个错误。

请仔细检查您的代码，并确保每个键都是唯一的。如果您需要进一步的帮助，请提供更多的上下文或代码示例，我会尽力给出更具体的建议。

相关问题

Duplicated key 'favoriteCount' vue/no-dupe-keys

This warning message is from Vue.js and it indicates that the same key has been used multiple times in a Vue.js template. Each element in a Vue.js template should have a unique key attribute.

To fix this warning, you need to go through your Vue.js template and make sure that each element has a unique key attribute. If you have multiple elements with the same key attribute, you can either remove the duplicates or make the key attribute unique by appending a unique identifier to it.

For example, if you have two elements with the key attribute "favoriteCount", you can rename them to "favoriteCount1" and "favoriteCount2" to make them unique.

Once you have fixed the duplicate key issue, the warning message should disappear.

利用CryptoAPI加/解密文件： 允许用户输入口令，根据用户输入的口令，加/解密文件， 要求： 由用户选择要加密或解密的文件 • 用户要输入口令， 用户没有输入口令，则用随机数产生密钥句柄

这里提供一个基本的 CryptoAPI 加/解密文件的实现：

#include <iostream>
#include <Windows.h>
#include <tchar.h>
#include <stdio.h>
#include <string.h>

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

#define BLOCK_SIZE 16

// 加密文件
BOOL EncryptFile(LPCTSTR file_path, LPCTSTR password) {
    // 打开文件
    HANDLE h_file = CreateFile(file_path, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (h_file == INVALID_HANDLE_VALUE) {
        std::cerr << "Failed to open file: " << file_path << std::endl;
        return FALSE;
    }

    // 获取文件大小
    DWORD file_size = GetFileSize(h_file, NULL);

    // 创建一个加密算法提供者
    HCRYPTPROV h_prov = 0;
    if (!CryptAcquireContext(&h_prov, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
        std::cerr << "Failed to acquire crypto context." << std::endl;
        CloseHandle(h_file);
        return FALSE;
    }

    // 根据口令获取密钥
    HCRYPTKEY h_key = 0;
    DWORD password_len = _tcslen(password);
    if (password_len > 0) {
        if (!CryptDeriveKey(h_prov, CALG_AES_256, NULL, 0, (LPBYTE)password, password_len * sizeof(TCHAR), 0, &h_key)) {
            std::cerr << "Failed to derive key." << std::endl;
            CryptReleaseContext(h_prov, 0);
            CloseHandle(h_file);
            return FALSE;
        }
    }
    else {
        // 如果用户没有输入口令，则用随机数产生密钥
        if (!CryptGenKey(h_prov, CALG_AES_256, CRYPT_EXPORTABLE, &h_key)) {
            std::cerr << "Failed to generate key." << std::endl;
            CryptReleaseContext(h_prov, 0);
            CloseHandle(h_file);
            return FALSE;
        }
    }

    // 获取加密块大小
    DWORD block_size = 0;
    DWORD block_size_len = sizeof(DWORD);
    if (!CryptGetKeyParam(h_key, KP_BLOCKLEN, (LPBYTE)&block_size, &block_size_len, 0)) {
        std::cerr << "Failed to get block size." << std::endl;
        CryptDestroyKey(h_key);
        CryptReleaseContext(h_prov, 0);
        CloseHandle(h_file);
        return FALSE;
    }
    block_size /= 8;

    // 创建一个加密模式
    HCRYPTKEY h_mode = 0;
    if (!CryptSetKeyParam(h_key, KP_MODE, (LPBYTE)CRYPT_MODE_CBC, 0)) {
        std::cerr << "Failed to set encryption mode." << std::endl;
        CryptDestroyKey(h_key);
        CryptReleaseContext(h_prov, 0);
        CloseHandle(h_file);
        return FALSE;
    }
    if (!CryptSetKeyParam(h_key, KP_IV, (LPBYTE)password, 0)) {
        std::cerr << "Failed to set IV." << std::endl;
        CryptDestroyKey(h_key);
        CryptReleaseContext(h_prov, 0);
        CloseHandle(h_file);
        return FALSE;
    }
    if (!CryptDuplicateKey(h_key, NULL, 0, &h_mode)) {
        std::cerr << "Failed to duplicate key." << std::endl;
        CryptDestroyKey(h_key);
        CryptReleaseContext(h_prov, 0);
        CloseHandle(h_file);
        return FALSE;
    }

    // 读取文件并加密
    DWORD bytes_read = 0;
    DWORD bytes_written = 0;
    BYTE buffer[BLOCK_SIZE * 2];
    BOOL success = TRUE;
    while (success && ReadFile(h_file, buffer, BLOCK_SIZE, &bytes_read, NULL) && bytes_read > 0) {
        if (bytes_read < block_size) {
            // 如果剩下的字节数不足一个加密块大小，则需要补齐
            DWORD padding_size = block_size - bytes_read;
            for (DWORD i = 0; i < padding_size; i++) {
                buffer[bytes_read + i] = (BYTE)padding_size;
            }
            bytes_read += padding_size;
        }
        if (!CryptEncrypt(h_mode, NULL, FALSE, 0, buffer, &bytes_read, sizeof(buffer))) {
            std::cerr << "Failed to encrypt data." << std::endl;
            success = FALSE;
        }
        if (success && !WriteFile(h_file, buffer, bytes_read, &bytes_written, NULL)) {
            std::cerr << "Failed to write encrypted data." << std::endl;
            success = FALSE;
        }
    }

    // 清理资源
    CryptDestroyKey(h_mode);
    CryptDestroyKey(h_key);
    CryptReleaseContext(h_prov, 0);
    CloseHandle(h_file);

    return success;
}

// 解密文件
BOOL DecryptFile(LPCTSTR file_path, LPCTSTR password) {
    // 打开文件
    HANDLE h_file = CreateFile(file_path, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (h_file == INVALID_HANDLE_VALUE) {
        std::cerr << "Failed to open file: " << file_path << std::endl;
        return FALSE;
    }

    // 获取文件大小
    DWORD file_size = GetFileSize(h_file, NULL);

    // 创建一个加密算法提供者
    HCRYPTPROV h_prov = 0;
    if (!CryptAcquireContext(&h_prov, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
        std::cerr << "Failed to acquire crypto context." << std::endl;
        CloseHandle(h_file);
        return FALSE;
    }

    // 根据口令获取密钥
    HCRYPTKEY h_key = 0;
    DWORD password_len = _tcslen(password);
    if (password_len > 0) {
        if (!CryptDeriveKey(h_prov, CALG_AES_256, NULL, 0, (LPBYTE)password, password_len * sizeof(TCHAR), 0, &h_key)) {
            std::cerr << "Failed to derive key." << std::endl;
            CryptReleaseContext(h_prov, 0);
            CloseHandle(h_file);
            return FALSE;
        }
    }
    else {
        std::cerr << "No password provided." << std::endl;
        CryptReleaseContext(h_prov, 0);
        CloseHandle(h_file);
        return FALSE;
    }

    // 获取加密块大小
    DWORD block_size = 0;
    DWORD block_size_len = sizeof(DWORD);
    if (!CryptGetKeyParam(h_key, KP_BLOCKLEN, (LPBYTE)&block_size, &block_size_len, 0)) {
        std::cerr << "Failed to get block size." << std::endl;
        CryptDestroyKey(h_key);
        CryptReleaseContext(h_prov, 0);
        CloseHandle(h_file);
        return FALSE;
    }
    block_size /= 8;

    // 创建一个加密模式
    HCRYPTKEY h_mode = 0;
    if (!CryptSetKeyParam(h_key, KP_MODE, (LPBYTE)CRYPT_MODE_CBC, 0)) {
        std::cerr << "Failed to set encryption mode." << std::endl;
        CryptDestroyKey(h_key);
        CryptReleaseContext(h_prov, 0);
        CloseHandle(h_file);
        return FALSE;
    }
    if (!CryptSetKeyParam(h_key, KP_IV, (LPBYTE)password, 0)) {
        std::cerr << "Failed to set IV." << std::endl;
        CryptDestroyKey(h_key);
        CryptReleaseContext(h_prov, 0);
        CloseHandle(h_file);
        return FALSE;
    }
    if (!CryptDuplicateKey(h_key, NULL, 0, &h_mode)) {
        std::cerr << "Failed to duplicate key." << std::endl;
        CryptDestroyKey(h_key);
        CryptReleaseContext(h_prov, 0);
        CloseHandle(h_file);
        return FALSE;
    }

    // 读取文件并解密
    DWORD bytes_read = 0;
    DWORD bytes_written = 0;
    BYTE buffer[BLOCK_SIZE * 2];
    BOOL success = TRUE;
    while (success && ReadFile(h_file, buffer, BLOCK_SIZE, &bytes_read, NULL) && bytes_read > 0) {
        if (!CryptDecrypt(h_mode, NULL, FALSE, 0, buffer, &bytes_read)) {
            std::cerr << "Failed to decrypt data." << std::endl;
            success = FALSE;
        }
        if (success && bytes_read > 0 && !WriteFile(h_file, buffer, bytes_read, &bytes_written, NULL)) {
            std::cerr << "Failed to write decrypted data." << std::endl;
            success = FALSE;
        }
    }

    // 清理资源
    CryptDestroyKey(h_mode);
    CryptDestroyKey(h_key);
    CryptReleaseContext(h_prov, 0);
    CloseHandle(h_file);

    return success;
}

int _tmain(int argc, _TCHAR* argv[])
{
    // 获取用户输入
    std::cout << "Enter file path: ";
    TCHAR file_path[MAX_PATH];
    std::wcin.getline(file_path, MAX_PATH);

    std::cout << "Enter password (empty for random key): ";
    TCHAR password[MAX_PATH];
    std::wcin.getline(password, MAX_PATH);

    std::cout << "Enter operation (0: encrypt, 1: decrypt): ";
    int operation;
    std::cin >> operation;

    // 执行加密/解密操作
    if (operation == 0) {
        EncryptFile(file_path, password);
    }
    else if (operation == 1) {
        DecryptFile(file_path, password);
    }
    else {
        std::cerr << "Invalid operation." << std::endl;
    }

    return 0;
}

以上代码中，我们先通过 `CryptAcquireContext` 函数获取一个加密算法提供者的句柄，然后根据用户输入的口令或随机数产生密钥句柄。接着，我们使用 `CryptSetKeyParam` 函数设置加密模式和初始化向量（IV），并使用 `CryptDuplicateKey` 函数创建一个加密模式的密钥句柄。最后，我们循环读取文件并使用 `CryptEncrypt` 或 `CryptDecrypt` 函数加/解密数据，并将加/解密后的数据写回到文件。

需要注意的是，这个实现中使用的是 AES-256 算法，加密模式为 CBC，填充方式为 PKCS#7。在实际应用中，我们可能需要根据具体情况选择不同的算法、模式和填充方式，以及使用更复杂的口令处理方式（比如加盐哈希算法）来提高安全性。