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Ê×ÏÈ £¬ÎÒÃÇÐèÒªÏàʶ÷è÷ë²Ù×÷ϵͳÌṩµÄÎļþ¼ÓÃÜÏ¢ÕùÃܽӿÚ¡£÷è÷ë²Ù×÷ϵͳÌṩÁËÒ»Ì×Îļþ¼ÓÃÜÏ¢ÕùÃÜ¿â £¬°üÀ¨Á˳£ÓõļÓÃÜË㷨ϢÕùÃÜËã·¨¡£ÎÒÃÇ¿ÉÒÔͨ¹ýŲÓÃÕâЩ¿âÖеĺ¯ÊýÀ´ÊµÏÖÎļþµÄ¼ÓÃÜÏ¢ÕùÃÜ¡£ÏÂÃæÊÇÒ»¸ö¼òÆӵļÓÃܺ¯ÊýʾÀý£º

#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;

    // ³õʼ»¯¼ÓÃÜÇéÐÎ
    ctx = EVP_CIPHER_CTX_new();
    EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, NULL);

    // ·­¿ªÊäÈëÎļþ
    input = fopen(input_file, "rb");
    if (!input) {
        fprintf(stderr, "Failed to open input file: %s
", input_file);
        return;
    }

    // ·­¿ªÊä³öÎļþ
    output = fopen(output_file, "wb");
    if (!output) {
        fprintf(stderr, "Failed to open output file: %s
", output_file);
        fclose(input);
        return;
    }

    // Öð¿é¼ÓÃÜÊý¾Ý
    while ((len = fread(inbuf, 1, sizeof(inbuf), input)) > 0) {
        EVP_EncryptUpdate(ctx, outbuf, &outlen, inbuf, len);
        fwrite(outbuf, 1, outlen, output);
        total += outlen;
    }

    // ¿¢ÊÈÎÃüÜÀú³Ì
    EVP_EncryptFinal_ex(ctx, outbuf, &outlen);
    fwrite(outbuf, 1, outlen, output);
    total += outlen;

    // ÕûÀíÊÂÇé
    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×Ö½ÚµÄÃÜÔ¿

    encrypt_file(input_file, output_file, key);

    return 0;
}

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³ýÁËÎļþ¼ÓÃÜ £¬÷è÷ë²Ù×÷ϵͳ»¹ÌṩÁËÎļþ½âÃܵĹ¦Ð§¡£ÏÂÃæÊÇÒ»¸ö¼òÆӵĽâÃܺ¯ÊýʾÀý£º

#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;

    // ³õʼ»¯½âÃÜÇéÐÎ
    ctx = EVP_CIPHER_CTX_new();
    EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, NULL);

    // ·­¿ªÊäÈëÎļþ
    input = fopen(input_file, "rb");
    if (!input) {
        fprintf(stderr, "Failed to open input file: %s
", input_file);
        return;
    }

    // ·­¿ªÊä³öÎļþ
    output = fopen(output_file, "wb");
    if (!output) {
        fprintf(stderr, "Failed to open output file: %s
", output_file);
        fclose(input);
        return;
    }

    // Öð¿é½âÃÜÊý¾Ý
    while ((len = fread(inbuf, 1, sizeof(inbuf), input)) > 0) {
        EVP_DecryptUpdate(ctx, outbuf, &outlen, inbuf, len);
        fwrite(outbuf, 1, outlen, output);
        total += outlen;
    }

    // ¿¢Ê½âÃÜÀú³Ì
    EVP_DecryptFinal_ex(ctx, outbuf, &outlen);
    fwrite(outbuf, 1, outlen, output);
    total += outlen;

    // ÕûÀíÊÂÇé
    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×Ö½ÚµÄÃÜÔ¿

    decrypt_file(input_file, output_file, key);

    return 0;
}

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