Android的对称加密与Base64加密

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对称加密是最快速、最简单的一种加密方式，加密（encryption）与解密（decryption）用的是同样的密钥（secret key）。常用的对称加密方式为：DES，AES。

DES的加密解密实例：

public class MainActivity extends AppCompatActivity {    private EditText des_input;    private EditText des_password;    private TextView show_des_encrypt;    private TextView show_des_decrypt;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView() {        des_input = ((EditText) findViewById(R.id.des_input));        des_password = ((EditText) findViewById(R.id.des_password));        show_des_encrypt = ((TextView) findViewById(R.id.show_des_encrypt));        show_des_decrypt = ((TextView) findViewById(R.id.show_des_decrypt));    }    /**     * DES 加密     * @param view     */    public void btnDESEncrypt(View view) {        //将DES加密写成工具类//        要加密内容        byte[] data = des_input.getText().toString().getBytes();        byte[] password = des_password.getText().toString().getBytes();        //工具类DESUtils中方法encrypt返回值是什么类型        byte[] result = DESUtils.encrypt(data, password);        //处理加密结果        byte[] encode = Base64.encode(result, Base64.DEFAULT);        //显示一下加密的结果        show_des_encrypt.setText(new String(encode));    }    /**     * DES 进行解密     * @param view     */    public void btnDESDecrypt(View view) {        //获取解密的数据        byte[] data = show_des_encrypt.getText().toString().getBytes();        byte[] decode = Base64.decode(data, Base64.DEFAULT);        //获取密码        byte[] password = des_password.getText().toString().getBytes();        byte[] result = DESUtils.decrypt(decode,password);        //对解密数据进行处理        show_des_decrypt.setText(new String(result));    }}

public class DESUtils {    public static byte[] encrypt(byte[] data, byte[] password) {        byte[] ret = null;        //判断参数是否符合条件        if(data!=null&&data.length>0){            if(password!=null&&password.length==8){                try {                    //1、创造加密引擎                    Cipher cipher = Cipher.getInstance("DES");                    //2、初始化                    SecretKeySpec key = new SecretKeySpec(password,"DES");                    cipher.init(Cipher.ENCRYPT_MODE,key);                    //3、对数据进行加密                    ret =cipher.doFinal(data);                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }    public static byte[] decrypt(byte[] data, byte[] password) {        byte[] ret = null;        if(data!=null&&data.length>0){            if(password!=null&&password.length==8){                try {                    //1、获取解密引擎                    Cipher cipher =Cipher.getInstance("DES");                    //2、初始化                    SecretKeySpec key = new SecretKeySpec(password,"DES");                    cipher.init(Cipher.DECRYPT_MODE,key);                    //3、解密                    ret = cipher.doFinal(data);                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }}

AES的加密解密实例：

注意：输入的password和ivParams为16位

public class AESUtils {    public static byte[] encrypt(byte[] data, byte[] password) {        byte[] ret = null;        if(data!=null&&data.length>0){            if(password!=null&&password.length==16){                try {                    //1、创造加密引擎                    Cipher cipher = Cipher.getInstance("AES");                    //2、初始化,无法使用SecretKeyFactory                    SecretKeySpec key = new SecretKeySpec(password,"AES");                    cipher.init(Cipher.ENCRYPT_MODE,key);                    //3、加密                    ret = cipher.doFinal(data);                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }    public static byte[] decrypt(byte[] data, byte[] password) {        byte[] ret = null;        if(data!=null&&data.length>0){            if(password!=null&&password.length==16){                try {                    //1、创造加密引擎                    Cipher cipher = Cipher.getInstance("AES");                    //2、初始化,无法使用SecretKeyFactory                    SecretKeySpec key = new SecretKeySpec(password,"AES");                    cipher.init(Cipher.DECRYPT_MODE,key);                    //3、加密                    ret = cipher.doFinal(data);                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }    /**     * AES 第二种加密算法     * @param data     * @param password     * @param ivParams     * @return     */    public static byte[] encrypt2(byte[] data, byte[] password, byte[] ivParams) {        byte[] ret = null;        if(data!=null&&data.length>0){            if(password!=null&&password.length==16&&ivParams!=null&&ivParams.length==16){                try {                    //1、创造加密引擎,CBC:加密模式；PKCS5Padding：填充模式                    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");                    //2、初始化,无法使用SecretKeyFactory                    SecretKeySpec key = new SecretKeySpec(password,"AES");                    //相当于第二个密码，向量参数，加密级别更高                    IvParameterSpec iv_params = new IvParameterSpec(ivParams);                    cipher.init(Cipher.ENCRYPT_MODE,key,iv_params);                    //3、加密                    ret = cipher.doFinal(data);                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                } catch (InvalidAlgorithmParameterException e) {                    e.printStackTrace();                }            }        }        return ret;    }}

public class MainActivity extends AppCompatActivity {    private EditText aes_input;    private EditText aes_password;    private TextView show_aes_decrypt;    private TextView show_aes_encrypt;    private byte[] password;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView() {        aes_input = ((EditText) findViewById(R.id.aes_input));        aes_password = ((EditText) findViewById(R.id.aes_password));        show_aes_encrypt = ((TextView) findViewById(R.id.show_aes_encrypt));        show_aes_decrypt = ((TextView) findViewById(R.id.show_aes_decrypt));    }    public void qqq(View view) {        byte[] data = aes_input.getText().toString().getBytes();        password = aes_password.getText().toString().getBytes();        //采用第二套加密算法，需要一个向量参数，相当于另一套密码        //指定向量参数（密码）        String iv = "0123456789abcdef";        //提供一个向量参数        byte[] ivParams = iv.getBytes();        byte[] result = AESUtils.encrypt2(data,password,ivParams);        //对返回来的结果进行处理，显示        byte[] encode = Base64.encode(result, Base64.DEFAULT);        show_aes_encrypt.setText(new String(encode));    }    public void www(View view) {        byte[] data = show_aes_encrypt.getText().toString().getBytes();        //对data进行处理        data = Base64.decode(data,Base64.DEFAULT);        byte[] result = AESUtils.decrypt(data,password);        if (result != null) {            show_aes_decrypt.setText(new String(result));        }else {            show_aes_decrypt.setText("解密失败");        }    }}

Base64加密实例：

public class Base64Activity extends AppCompatActivity {    private EditText input;    private TextView show_base64_encode;    private TextView show_base64_decode;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_base64);        initView();//      initData();    }    private void initData() {        String input = this.input.getText().toString();        if (input != null) {            byte[] bytes = input.getBytes();            byte[] encode = Base64.encode(bytes, 0, bytes.length, Base64.NO_WRAP);            //显示咱们编码的内容            show_base64_encode.setText(new String(encode));        }    }    private void initView() {        input = ((EditText) findViewById(R.id.input));        show_base64_encode = ((TextView) findViewById(R.id.show_base64_encode));        show_base64_decode = ((TextView) findViewById(R.id.show_base64_decode));    }    /**     * 进行Base64编码     * @param view     */    public void btnBase64Encode(View view) {        String input = this.input.getText().toString();        if (input != null) {            byte[] bytes = input.getBytes();            byte[] encode = Base64.encode(bytes, 0, bytes.length, Base64.NO_WRAP);            //Base64，在进行编码时采用什么样的格式进行编码，建议大家解码时就采用什么样的形式进行解码            //保证数据万无一失，没有错误，肯定是这种逻辑            String encodeToString = Base64.encodeToString(bytes, 0, bytes.length, Base64.NO_WRAP);            //显示咱们编码的内容//            show_base64_encode.setText(new String(encode));            show_base64_encode.setText(encodeToString);        }    }    /**     * 进行Base64解密     * @param view     */    public void btnBase64Decode(View view) {        String str = show_base64_encode.getText().toString();        byte[] decode = Base64.decode(str, Base64.DEFAULT);        byte[] decode1 = Base64.decode(str.getBytes(), 0, str.getBytes().length, Base64.DEFAULT);        show_base64_decode.setText(new String(decode1));    }}

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