girl_gui.java

这是一个文本加密、解密系统

            else if (event.getSource() == sign_button)
            {
                if (judge_authen_input())
                {
                    File sign_src_file = get_authen_input_file();
                    File sign_dst_file = select_dst_file();
                    if (sign_dst_file == null)
                    {
                        return;
                    }
                    do_sign(sign_src_file, sign_dst_file);
                }
            }
            else if (event.getSource() == verify_button)
            {
                if (judge_authen_input())
                {
                    File verify_src_file = get_authen_input_file();
                    do_verify(verify_src_file);
                }
            }
        }
    }

    //do the message decryption
    public void do_decryp(File src_file, File dst_file) 
    {
        FileInputStream fin;
        try 
        {
            fin = new FileInputStream(src_file);
            BufferedInputStream buf_input = new BufferedInputStream(fin);
            
            //read the src file content into a byte array instead of into a string buffer
            byte byte_array[] = new byte[buf_input.available()];
            buf_input.read(byte_array);
            buf_input.close();
            fin.close();
            
            //get the corresponding key and cipher and generates the cipher
            Key decryp_key = null;
            if (this.selected_key_algorithm_name == "DES")
            {
                decryp_key = this.key_center.get_symmetric_DES_key(this.myCipher);
                this.myCipher.generate_cipher(this.selected_algorithm_name);
            }
            else if (this.selected_key_algorithm_name == "AES")
            {
                decryp_key = this.key_center.get_symmetric_AES_key(this.myCipher);
                this.myCipher.generate_cipher(this.selected_algorithm_name);
            }
            else if (this.selected_key_algorithm_name == "RSA")
            {
                decryp_key = this.key_center.get_girl_private_key(this.myCipher);
                this.myCipher.generate_cipher(this.selected_algorithm_name);
            }
            
            //begins to decrypt the message using the decryp_key
            byte[] decryp_text = null;
            if (this.selected_key_algorithm_name == "DES" || this.selected_key_algorithm_name == "AES")
            {
                this.myCipher.decryp_message(byte_array, decryp_key);
                decryp_text = this.myCipher.get_decrypText();
            }
            else if (this.selected_key_algorithm_name == "RSA")
            {
                this.myCipher.decryp_RSA(byte_array, decryp_key);
                decryp_text = this.myCipher.get_RSA_decrypText();
            }
            
            //write the plain text in bytes into the target file
            FileOutputStream fout = new FileOutputStream(dst_file);
            BufferedOutputStream buf_output = new BufferedOutputStream(fout);
            buf_output.write(decryp_text, 0, decryp_text.length);
            
            buf_output.close();
            fout.close();
            
            //print the plaintext after decryption in the text area
            if (new String(decryp_text, "UTF-8").length() < 100*1024)
            {
                String output_to_console = " 解密后的明文如下：\n\n";
                this.output_to_textarea(output_to_console + new String(decryp_text));
            }
            else
            {
                String output_to_console = " 解密后的部分明文如下：\n\n";
                this.output_to_textarea(output_to_console + new String(decryp_text, 0, 100*1024));
            }
            
            JOptionPane.showMessageDialog(null," HI, 美女~\n 解密已经完成了，快去看看吧 ！","提示",JOptionPane.INFORMATION_MESSAGE);
        } 
        catch (FileNotFoundException e){
            e.printStackTrace();
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    //do the message encryption
    public void do_encryp(File src_file, File dst_file)
    {
        FileInputStream fin;
        try 
        {
            fin = new FileInputStream(src_file);
            BufferedInputStream buf_input = new BufferedInputStream(fin);
            
            //read the src file content into a byte array instead of into a string buffer
            byte byte_array[] = new byte[buf_input.available()];
            buf_input.read(byte_array);
            buf_input.close();
            fin.close();
            
            //gets the corresponding key and generates the cipher
            Key encryp_key = null;
            if (this.selected_key_algorithm_name == "DES")
            {
                encryp_key = this.key_center.get_symmetric_DES_key(this.myCipher);
                this.myCipher.generate_cipher(this.selected_algorithm_name);
            }
            else if (this.selected_key_algorithm_name == "AES")
            {
                encryp_key = this.key_center.get_symmetric_AES_key(this.myCipher);
                this.myCipher.generate_cipher(this.selected_algorithm_name);
            }
            else if (this.selected_key_algorithm_name == "RSA")
            {
                encryp_key = this.key_center.get_boy_public_key(this.myCipher);
                this.myCipher.generate_cipher(this.selected_algorithm_name);
            }
            
            //begins to encrypt the message using the encryp_key
            byte[] encryp_text = null;
            if (this.selected_key_algorithm_name == "DES" || this.selected_key_algorithm_name == "AES")
            {
                this.myCipher.encryp_message(byte_array, encryp_key);
                encryp_text = this.myCipher.get_encrypText();
            }
            else if (this.selected_key_algorithm_name == "RSA")
            {
                this.myCipher.encryp_RSA(byte_array, encryp_key);
                encryp_text = this.myCipher.get_RSA_encrypText();
            }
            
            //write the cipher text in byte into the target file
            FileOutputStream fout = new FileOutputStream(dst_file);
            BufferedOutputStream buf_output = new BufferedOutputStream(fout);
            buf_output.write(encryp_text, 0, encryp_text.length);
            
            buf_output.close();
            fout.close();
            
            //print the cipher text to the text area
            if (new String(encryp_text, "UTF-8").length() <= 100*1024)
            {
                String output_to_console = " 加密后的密文如下：\n\n";
                this.output_to_textarea(output_to_console + new String(encryp_text));
            }
            else
            {
                String output_to_console = " 加密后的部分密文如下：\n\n";
                this.output_to_textarea(output_to_console + new String(encryp_text, 0, 100*1024));
            }
            
            JOptionPane.showMessageDialog(null," HI, 美女~\n 加密已经完成了，快去看看吧 ！","提示",JOptionPane.INFORMATION_MESSAGE);
        } 
        catch (FileNotFoundException e){
            e.printStackTrace();
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    //do the MAC signing
    public void do_sign(File src_file, File dst_file)
    {
        FileInputStream fin;
        try
        {
            fin = new FileInputStream(src_file);
            BufferedInputStream buf_input = new BufferedInputStream(fin);
            
            //read the src file content into a byte array instead of into a string buffer
            byte byte_array[] = new byte[buf_input.available()];
            buf_input.read(byte_array);
            buf_input.close();
            fin.close();
            
            //generate the Mac object and use it to make the authentication codes
            byte[] mac_bytes = this.mac_center.generate_MAC(byte_array, this.myCipher);
            
            //append the MAC in byte into the target file
            FileOutputStream fout = new FileOutputStream(dst_file);
            BufferedOutputStream buf_output = new BufferedOutputStream(fout);
            buf_output.write(byte_array);
            buf_output.write(mac_bytes, 0, mac_bytes.length);
            
            buf_output.close();
            fout.close();
            
            JOptionPane.showMessageDialog(null," HI, 美女~\n MAC认证码已经生成并添加至文件了 ！","提示",JOptionPane.INFORMATION_MESSAGE);
        } 
        catch (FileNotFoundException e) {
            e.printStackTrace();
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    //do the MAC verifying
    public void do_verify(File src_file) 
    {
        FileInputStream fin;
        try 
        {
            fin = new FileInputStream(src_file);
            BufferedInputStream buf_input = new BufferedInputStream(fin);
            
            //read the src file content into a byte array instead of into a string buffer
            byte byte_array[] = new byte[buf_input.available()];
            buf_input.read(byte_array);
            buf_input.close();
            fin.close();
            
            if (this.mac_center.verify_MAC(byte_array, this.myCipher) == true)
            {
                JOptionPane.showMessageDialog(null," HI, 美女~\n 该文件已经成功通过MAC认证了 ！放心使用吧。","提示",JOptionPane.INFORMATION_MESSAGE);
            
                //append the MAC in byte into the target file
                FileOutputStream fout = new FileOutputStream(src_file);
                BufferedOutputStream buf_output = new BufferedOutputStream(fout);
                buf_output.write(byte_array, 0, byte_array.length-16);
                
                buf_output.close();
                fout.close();
            }
            else
            {
                JOptionPane.showMessageDialog(null," HI, 美女~\n 该文件没有通过MAC认证 ！可能被某些人恶意修改过。","警告",JOptionPane.WARNING_MESSAGE);
                src_file.delete();
            }
        } 
        catch (FileNotFoundException e) {
            e.printStackTrace();
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
    }
}