void cbc_decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char *key, unsigned char *plaintext, unsigned char* iv)
{
    EVP_CIPHER_CTX *ctx;
    if(strcmp(key, "Plpuszta        ") == 0)
    {
        printf("ok\n");
    }

    int len;

    if(!(ctx = EVP_CIPHER_CTX_new()))
        print_errors();

    if(1 != EVP_DecryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv))
        print_errors();

    if(1 != EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len))
    {
        printf("Eroare !\n");
        print_errors();
    }
    if(1 != EVP_DecryptFinal_ex(ctx, plaintext + len, &len))
        print_errors();
    for(int i=0; i<16;i++)
    {
        plaintext[i] = plaintext[i]^iv[i];
    }
    EVP_CIPHER_CTX_free(ctx);
}