常见编码加密解密的基础用法

• Base64编码
• URL编码
• GZIP
• AES加密
• DES加密

• RSA加密

  public class MainActivity extends AppCompatActivity {
  private EditText mTextContent;
  private TextView mTxtResult;
  private TextView mTxtPass;
  private byte [] mDecode;
  private byte [] mPriDecode;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  mTextContent = (EditText) findViewById (R.id.txt_content);
  mTxtResult = (TextView) findViewById (R.id.txt_result);
  mTxtPass = (TextView) findViewById (R.id.txt_password);
  }
  

  编码

  
  public void btnBase64Encode(View view) {
  String str = mTextContent.getText().toString().trim();
  // Base64编码 no_wrap 代表编码的结果没有任何换行
  String encoded = Base64.encodeToString(str.getBytes(), Base64.NO_WRAP);
  mTxtResult.setText(encoded);
  //Base64 解码，
  byte[] decode = Base64.decode(encoded, Base64.NO_WRAP);
  String ss = new String(decode);
  Log.d("Base64 ", "ss = " + ss);
  }
  public void btnURLEncode(View view) {
  String str = "%E5%8F%98%E5%BD%A2%E9%87%91%E5%88%9A";
  try {
  String decode = URLDecoder.decode(str, "utf-8");
  Log.d("UE", "URLENCODING: " + decode);
  } catch (UnsupportedEncodingException e) {
  e.printStackTrace();
  }
  //URLEncoder
  try {
  String encode = URLEncoder.encode("BY帅", "utf-8");
  Log.d("UE", "URLENCODING: edncode: " + encode);
  } catch (UnsupportedEncodingException e) {
  e.printStackTrace();
  }
  }
  /**
  * GZIP压缩，解压缩
  *
  * @param view
  */
  public void btnGzipTest(View view) {
  String str = mTextContent.getText().toString().trim();
  // 1.压缩GZIP,GZIPOutPutStream
  ByteArrayOutputStream bout = new ByteArrayOutputStream();
  try {
  GZIPOutputStream gzipout = new GZIPOutputStream(bout);
  gzipout.write(str.getBytes());//利用GZIPOutPutStream压缩，并输出结果
  gzipout.finish();//必须调用生成实际的压缩数据
  gzipout.close();
  } catch (IOException e) {
  e.printStackTrace();
  }
  byte[] bytes = bout.toByteArray();
  mTxtResult.setText("内容长度：" + str.length() + "n压缩大小：" + bytes.length);
  String s = Arrays.toString(bytes);
  Log.d("GZIP", s);
  //解压缩 GZIPInputStream
  ByteArrayInputStream bin = new ByteArrayInputStream(bytes);
  try {
  GZIPInputStream gzipIn = new GZIPInputStream(bin);
  ByteArrayOutputStream bo = new ByteArrayOutputStream();
  byte[] buf = new byte[128];
  int len;
  while (true) {
  len = gzipIn.read(buf);
  if (len == -1) {
  break;
  }
  bo.write(buf, 0, len);
  }
  byte[] bytes1 = bo.toByteArray();
  String s1 = new String(bytes1);
  Log.d("GZIP", s1);
  } catch (IOException e) {
  e.printStackTrace();
  }
  }
  public void btnDesTest(View view) {
  //DES TEST
  String str = mTextContent.getText().toString().trim();
  String pwd = mTxtPass.getText().toString().trim();
  //
  byte[] encrypt = CryptUtil.desEncrypt(str.getBytes(), pwd.getBytes());
  byte[] iv = {23, 12, 3, 2, 4, 5, 7, 3, 4, 3, 34, 66, 6, 7, 93, 12};
  byte[] encrypt = CryptUtil.aesEncryptWithIv(str.getBytes(), pwd.getBytes(), iv);
  String s = Base64.encodeToString(encrypt, Base64.NO_WRAP);
  mTxtResult.setText(s);
  //解密，把Base64还原，并且解密
  byte[] ed = Base64.decode(s, Base64.NO_WRAP);
  byte[] data = CryptUtil.aesDecryptWithIv(ed, pwd.getBytes(), iv);
  String ss = new String(data);
  Log.d("DES", "btnDesTest : " + ss);
  }
  public void btnRsaTest(View view) {
  String state = Environment.getExternalStorageState();
  File dir = getFilesDir();
  if (state.equals(Environment.MEDIA_MOUNTED)) {
  dir = Environment.getExternalStorageDirectory();
  }
  if (!dir.exists()) {
  dir.mkdirs();
  }
  Log.d("KEY", "dir : " + dir.getAbsolutePath());
  File target = new File(dir, "secret.txt");
  try {
  if (!target.exists()) {
  // 1.加载或者生成密钥对
  KeyPair keyPair = CryptUtil.generateRsaKey(1024);
  // 私钥
  PrivateKey aPrivate = keyPair.getPrivate();
  // 公钥
  PublicKey aPublic = keyPair.getPublic();
  // 私钥的数据格式
  byte[] privEncoded = aPrivate.getEncoded();
  byte[] pubEncoded = aPublic.getEncoded();
  //
  String publicstr = aPublic.toString();
  String pubkeyEncode = Base64.encodeToString(pubEncoded, Base64.NO_WRAP);
  String priKeyEncode = Base64.encodeToString(privEncoded, Base64.NO_WRAP);
  //
  Log.d("Key", publicstr);
  //TODO:把公钥，私钥使用BASE64编码，保存到文件中，下一次启动时，需要先加载，没有才创建
  target.createNewFile();
  BufferedWriter bw = new BufferedWriter(new FileWriter(target, true));
  bw.write(pubkeyEncode);
  bw.newLine();
  bw.write(priKeyEncode);
  bw.close();
  BufferedReader bufferedReader = new BufferedReader(new FileReader(target));
  String Pub = bufferedReader.readLine();
  mDecode = Base64.decode(Pub, Base64.NO_WRAP);
  String Pri = bufferedReader.readLine();
  mPriDecode = Base64.decode(Pri, Base64.NO_WRAP);
  bufferedReader.close();
  //
  FileOutputStream fos = new FileOutputStream(target);
  //
  fos.write(pubencode);
  //
  fos.close();
  }else if (target.exists()){
  BufferedReader bufferedReader = new BufferedReader(new FileReader(target));
  String Pub = bufferedReader.readLine();
  mDecode = Base64.decode(Pub, Base64.NO_WRAP);
  String Pri = bufferedReader.readLine();
  mPriDecode = Base64.decode(Pri, Base64.NO_WRAP);
  Log.d("key","public: " + Pub);
  Log.d("key","private: " + Pri);
  bufferedReader.close();
  }
  } catch (IOException e) {
  e.printStackTrace();
  }
  X509EncodedKeySpec keySpec = new X509EncodedKeySpec(mDecode);
  PKCS8EncodedKeySpec pkeySpec = new PKCS8EncodedKeySpec(mPriDecode);
  RSAPrivateKey privateKey = null;
  RSAPublicKey rsap = null;
  KeyFactory keyFactory;
  try {
  keyFactory = KeyFactory.getInstance("RSA");
  rsap = (RSAPublicKey) keyFactory.generatePublic(keySpec);
  privateKey = (RSAPrivateKey) keyFactory.generatePrivate(pkeySpec);
  } catch (NoSuchAlgorithmException e) {
  e.printStackTrace();
  } catch (InvalidKeySpecException e) {
  e.printStackTrace();
  }
  String str = mTextContent.getText().toString().trim();
  byte[] encrypt = CryptUtil.rsaEncrypt(str.getBytes(), rsap);
  String es = Base64.encodeToString(encrypt, Base64.NO_WRAP);
  mTxtResult.setText(es);
  byte[] dd = Base64.decode(es, Base64.NO_WRAP);
  byte[] data = CryptUtil.rsaDecrypt(dd, privateKey);
  String s1 = new String(data);
  Log.d("RSA", "RSACry : " + s1);
  }
  }
  

加密工具类

public class CryptUtil {
private CryptUtil() {
}
/**
* DES 加密算法
*
* @param data 原始数据
* @param key
密码，必须是8个字节
* @return byte[] 经过加密之后的内容
*/
public static byte[] desEncrypt(byte[] data, byte[] key) {
byte[] ret = null;
if (data != null && key != null) {
if (data.length > 0 && key.length == 8) {
// 1.使用 Cipher引擎，来初始化加密，并且设置密码
try {
Cipher cipher = Cipher.getInstance("DES");
// 1.1 DESKEYSPEC用于描述 的事的密码
DESKeySpec spec = new DESKeySpec(key);
// 1.2使用SecretKeyFactory生成Key对象
SecretKeyFactory des = SecretKeyFactory.getInstance("DES");
SecretKey sk = des.generateSecret(spec);
// 1.3初始化Cipper 为加密I操作，并且制定密钥
cipher.init(Cipher.ENCRYPT_MODE, sk);
// 2.加密数据
ret = cipher.doFinal(data);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (InvalidKeySpecException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
}
}
}
return ret;
}
/**
* DES 解密算法
*
* @param data 原始数据
* @param key
密码，必须是8个字节
* @return byte[] 经过解密之后的内容
*/
public static byte[] desDecrypt(byte[] data, byte[] key) {
byte[] ret = null;
if (data != null && key != null) {
if (data.length > 0 && key.length == 8) {
// 1.使用 Cipher引擎，来初始化解密，并且设置密码
try {
Cipher cipher = Cipher.getInstance("DES");
// 1.1 DESKEYSPEC用于描述 的事的密码
DESKeySpec spec = new DESKeySpec(key);
// 1.2使用SecretKeyFactory生成Key对象
SecretKeyFactory des = SecretKeyFactory.getInstance("DES");
SecretKey sk = des.generateSecret(spec);
// 1.3初始化Cipper 为解密操作，并且制定密钥
cipher.init(Cipher.DECRYPT_MODE, sk);
// 2.解密数据
ret = cipher.doFinal(data);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (InvalidKeySpecException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
}
}
}
return ret;
}
///
// AES方式
///
public static byte[] aesEncrySimple(byte[] data, byte[] key) {
byte[] ret = null;
if (data != null && key != null) {
if (data.length > 0 && key.length == 16) {
// AES 128bit = 16nytes
try {
Cipher cipher = Cipher.getInstance("AES");
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
cipher.init(Cipher.ENCRYPT_MODE, keySpec);
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[] aesDecrySimple(byte[] data, byte[] key) {
byte[] ret = null;
if (data != null && key != null) {
if (data.length > 0 && key.length == 16) {
// AES 128bit = 16nytes
try {
Cipher cipher = Cipher.getInstance("AES");
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
cipher.init(Cipher.DECRYPT_MODE, keySpec);
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 方式2 使用两套密码
///
/**
* 使用两套密码的加密，强度更高
*
* @param data
数据
* @param key
第一个密码
* @param ivData 第二个密码
* @return
*/
public static byte[] aesEncryptWithIv(byte[] data, byte[] key, byte[] ivData) {
byte[] ret = null;
if (data != null && key != null && ivData != null) {
if (data.length > 0 && key.length == 16 && ivData.length == 16) {
//使用两套密码的，算法需要写成AES/算法模式/填充模式
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
//准备第一套
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
//准备第二套密码
IvParameterSpec iv = new IvParameterSpec(ivData);
cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv);
//
ret = cipher.doFinal(data);
cipher.update(data);
ret = cipher.doFinal();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
}
}
}
return ret;
}
public static byte[] aesDecryptWithIv(byte[] data, byte[] key, byte[] ivData) {
byte[] ret = null;
if (data != null && key != null && ivData != null) {
if (data.length > 0 && key.length == 16 && ivData.length == 16) {
//使用两套密码的，算法需要写成AES/算法模式/填充模式
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
//准备第一套
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
//准备第二套密码
IvParameterSpec iv = new IvParameterSpec(ivData);
cipher.init(Cipher.DECRYPT_MODE, keySpec, iv);
//
ret = cipher.doFinal(data);
cipher.update(data);
ret = cipher.doFinal();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
}
}
}
return ret;
}
///
// RSA
///
// 1.生成密钥对， 公钥和私钥
/**
* bits
位数必须在 1024 和 2048 之间
*
* @param bits
* @return
*/
public static KeyPair generateRsaKey(int bits) {
KeyPair ret = null;
try {
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(bits);
ret = kpg.generateKeyPair();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return ret;
}
/**
*
RSA 加密，使用公钥加密，那么必须使用私钥解密
*
使用私钥加密，必须使用公钥解密
*
* @param data
* @param key
* @return
*/
public static byte[] rsaEncrypt(byte[] data, Key key) {
byte[] ret = null;
if (data != null && data.length > 0 && key != null) {
try {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, key);
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;
}
//解密
public static byte[] rsaDecrypt(byte[] data, Key key) {
byte[] ret = null;
if (data != null && data.length > 0 && key != null) {
try {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, key);
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;
}
}

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