How does file encryption and decryption in Kirin OS protect your privacy?-Linux Operation and Maintenance-php.cn

How does file encryption and decryption in Kirin OS protect your privacy?

王林

Release： 2023-08-05 18:10:50

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How does file encryption and decryption in Kirin OS protect your privacy?

With the development of information technology, our private information is becoming more and more vulnerable to leakage and infringement. In order to protect our privacy, file encryption and decryption have become a common method. In Kirin operating system, we can use the file encryption and decryption functions it provides to protect our privacy and sensitive data. This article will introduce the file encryption and decryption functions in Kirin operating system and give corresponding code examples.

First of all, we need to understand the file encryption and decryption interface provided by Kirin operating system. Kirin operating system provides a set of file encryption and decryption libraries, including commonly used encryption algorithms and decryption algorithms. We can encrypt and decrypt files by calling functions in these libraries. The following is a simple encryption function example:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/evp.h>

void encrypt_file(const char *input_file, const char *output_file, const char *key) {
    EVP_CIPHER_CTX *ctx;
    FILE *input, *output;
    unsigned char inbuf[1024], outbuf[1024 + EVP_MAX_BLOCK_LENGTH];
    int outlen, len, total = 0;

    // 初始化加密环境
    ctx = EVP_CIPHER_CTX_new();
    EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, NULL);

    // 打开输入文件
    input = fopen(input_file, "rb");
    if (!input) {
        fprintf(stderr, "Failed to open input file: %s
", input_file);
        return;
    }

    // 打开输出文件
    output = fopen(output_file, "wb");
    if (!output) {
        fprintf(stderr, "Failed to open output file: %s
", output_file);
        fclose(input);
        return;
    }

    // 逐块加密数据
    while ((len = fread(inbuf, 1, sizeof(inbuf), input)) > 0) {
        EVP_EncryptUpdate(ctx, outbuf, &outlen, inbuf, len);
        fwrite(outbuf, 1, outlen, output);
        total += outlen;
    }

    // 结束加密过程
    EVP_EncryptFinal_ex(ctx, outbuf, &outlen);
    fwrite(outbuf, 1, outlen, output);
    total += outlen;

    // 清理工作
    fclose(input);
    fclose(output);
    EVP_CIPHER_CTX_free(ctx);

    printf("Encryption finished. Encrypted %d bytes.
", total);
}

int main() {
    const char *input_file = "plain.txt";
    const char *output_file = "encrypted.txt";
    const char *key = "abcdefghijklmnop";  // 16字节的密钥

    encrypt_file(input_file, output_file, key);

    return 0;
}

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The above code demonstrates how to use the file encryption interface in Kirin operating system to encrypt one file into another file. We first need to open the input and output files, then encrypt the input file using the specified key and write the result to the output file. Finally, we need to clean up the relevant resources and output the total number of bytes encrypted. It should be noted that the length of the key needs to meet the requirements of the encryption algorithm.

In addition to file encryption, Kirin operating system also provides file decryption function. The following is a simple decryption function example:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/evp.h>

void decrypt_file(const char *input_file, const char *output_file, const char *key) {
    EVP_CIPHER_CTX *ctx;
    FILE *input, *output;
    unsigned char inbuf[1024], outbuf[1024 + EVP_MAX_BLOCK_LENGTH];
    int outlen, len, total = 0;

    // 初始化解密环境
    ctx = EVP_CIPHER_CTX_new();
    EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, NULL);

    // 打开输入文件
    input = fopen(input_file, "rb");
    if (!input) {
        fprintf(stderr, "Failed to open input file: %s
", input_file);
        return;
    }

    // 打开输出文件
    output = fopen(output_file, "wb");
    if (!output) {
        fprintf(stderr, "Failed to open output file: %s
", output_file);
        fclose(input);
        return;
    }

    // 逐块解密数据
    while ((len = fread(inbuf, 1, sizeof(inbuf), input)) > 0) {
        EVP_DecryptUpdate(ctx, outbuf, &outlen, inbuf, len);
        fwrite(outbuf, 1, outlen, output);
        total += outlen;
    }

    // 结束解密过程
    EVP_DecryptFinal_ex(ctx, outbuf, &outlen);
    fwrite(outbuf, 1, outlen, output);
    total += outlen;

    // 清理工作
    fclose(input);
    fclose(output);
    EVP_CIPHER_CTX_free(ctx);

    printf("Decryption finished. Decrypted %d bytes.
", total);
}

int main() {
    const char *input_file = "encrypted.txt";
    const char *output_file = "plain.txt";
    const char *key = "abcdefghijklmnop";  // 16字节的密钥

    decrypt_file(input_file, output_file, key);

    return 0;
}

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The above code demonstrates how to use the file decryption interface in Kirin operating system to decrypt an encrypted file into the original file. We first need to open the input file and the output file, then decrypt the input file using the specified key and write the result to the output file. Finally, we need to clean up the relevant resources and output the total number of bytes decrypted.

Through the above sample code, we can use the file encryption and decryption functions in Kirin Operating System to protect our privacy and sensitive data. Please note that in practical applications, we need to pay attention to the generation, storage and management of keys, as well as the selection and parameter settings of encryption algorithms to improve the security of file encryption.

In short, the file encryption and decryption functions in Kirin operating system provide us with a convenient and reliable means to protect privacy. We can flexibly use these functions to strengthen the protection of sensitive data according to our own needs and actual conditions.

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