无法使用OpenSSL EVP_ *函数

Question

我使用FUSE开发了一个密码文件系统。使用openSSL函数我可以毫无问题地加密和解密常规文件块。问题是当我加密二进制文件（ELF）时，它不起作用，我不知道为什么。我使用下一个代码：

int encrypt_data_no_pad(unsigned char *plaintext, int plaintext_len, unsigned char *key,
        unsigned char *iv, unsigned char *ciphertext, int algorithm_pos)
{
    EVP_CIPHER_CTX *ctx;

    int len;

    int ciphertext_len;

    /* Create and initialise the context */
    if(!(ctx = EVP_CIPHER_CTX_new())) handleErrors();

    /* Initialise the encryption operation. IMPORTANT - ensure you use a key
     * and IV size appropriate for your cipher
     * In this example we are using 256 bit AES (i.e. a 256 bit key). The
     * IV size for *most* modes is the same as the block size. For AES this
     * is 128 bits */
    if(1 != EVP_EncryptInit_ex(ctx, ciphers[algorithm_pos].algorithm(), NULL, key, iv))
        handleErrors();

    EVP_CIPHER_CTX_set_padding(ctx, 0); //Quitamos el padding automatico

    /* Provide the message to be encrypted, and obtain the encrypted output.
     * EVP_EncryptUpdate can be called multiple times if necessary
     */
    if(1 != EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len))
        handleErrors();
    ciphertext_len = len;

    /* Finalise the encryption. Further ciphertext bytes may be written at
     * this stage.
     */
    if(1 != EVP_EncryptFinal_ex(ctx, ciphertext + len, &len)) handleErrors();
    ciphertext_len += len;

    /* Clean up */
    EVP_CIPHER_CTX_free(ctx);

    return ciphertext_len;
}

int decrypt_data_no_pad(unsigned char *ciphertext, int ciphertext_len, unsigned char *key,
        unsigned char *iv, unsigned char *plaintext, int algorithm_pos)
{
    EVP_CIPHER_CTX *ctx;

    int len;

    int plaintext_len;

    /* Create and initialise the context */
    if(!(ctx = EVP_CIPHER_CTX_new())) handleErrors();

    /* Initialise the decryption operation. IMPORTANT - ensure you use a key
     * and IV size appropriate for your cipher
     * In this example we are using 256 bit AES (i.e. a 256 bit key). The
     * IV size for *most* modes is the same as the block size. For AES this
     * is 128 bits */
    if(1 != EVP_DecryptInit_ex(ctx, ciphers[algorithm_pos].algorithm(), NULL, key, iv))
        handleErrors();

    EVP_CIPHER_CTX_set_padding(ctx, 0); //Quitamos el padding automatico
    /* Provide the message to be decrypted, and obtain the plaintext output.
     * EVP_DecryptUpdate can be called multiple times if necessary
     */
    if(1 != EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len))
        handleErrors();
    plaintext_len = len;
    /* Finalise the decryption. Further plaintext bytes may be written at
     * this stage.
     */
    if(1 != EVP_DecryptFinal_ex(ctx, plaintext + len, &len)) handleErrors();
    plaintext_len += len;

    /* Clean up */
    EVP_CIPHER_CTX_free(ctx);

    return plaintext_len;
}

这是代码的一部分，我认为问题是elf文件中的0字节。我认为这些函数在明文中间的0字节不起作用。可能是那个？或者这些功能还能正常工作吗？在他的情况下，问题将在其余的代码中，我将寻找那里的错误。

谢谢你的时间。