A Java configuration file encryption and decryption utility class share
- 2020-04-01 03:16:57
- OfStack
Common such as: database user password, SMS platform user password, the system between the calibration of the fixed password.
This tool class refers to the implementation of section 5.3 of Spring.3. X enterprise application development practice.
The complete code and comment information is as follows:
package com.cncounter.util.comm;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DESUtils {
//The key
private static Key key;
//The KEY of seeds
private static String KEY_STR = "encrypt@cncounter.com";
//constant
public static final String UTF_8 = "UTF-8";
public static final String DES = "DES";
//Static initialization
static{
try {
//The KEY generator
KeyGenerator generator = KeyGenerator.getInstance(DES);
//Initialization, secure random operator
generator.init(new SecureRandom( KEY_STR.getBytes(UTF_8) ));
//Generate the key
key = generator.generateKey();
generator = null;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static String encode(String source){
try {
//Gets the byte array based on the encoding format
byte[] sourceBytes = source.getBytes(UTF_8);
//DES encryption mode
Cipher cipher = Cipher.getInstance(DES);
cipher.init(Cipher.ENCRYPT_MODE, key);
//The encrypted byte array
byte[] encryptSourceBytes = cipher.doFinal(sourceBytes);
//Base64 encoder
BASE64Encoder base64Encoder = new BASE64Encoder();
return base64Encoder.encode(encryptSourceBytes);
} catch (Exception e) {
//Throw is also a return path
throw new RuntimeException(e);
}
}
/**
* This utility class encode() Method to decode the encrypted string / decryption
* @param encrypted An encrypted string , The cipher
* @return Plaintext string
*/
public static String decode(String encrypted){
//Base64 decoder
BASE64Decoder base64Decoder = new BASE64Decoder();
try {
//Start with the base64 decoding
byte[] cryptedBytes = base64Decoder.decodeBuffer(encrypted);
//DES decryption mode
Cipher cipher = Cipher.getInstance(DES);
cipher.init(Cipher.DECRYPT_MODE, key);
//The decoded byte array
byte[] decryptStrBytes = cipher.doFinal(cryptedBytes);
//Converts a byte array into a string in the given encoding format
return new String(decryptStrBytes, UTF_8);
} catch (Exception e) {
//This form is really good for working with utility classes
throw new RuntimeException(e);
}
}
//Unit testing
public static void main(String[] args) {
//A string that needs to be encrypted
String email = "renfufei@qq.com";
//encryption
String encrypted = DESUtils.encode(email);
//decryption
String decrypted = DESUtils.decode(encrypted);
//Output result;
System.out.println("email: " + email);
System.out.println("encrypted: " + encrypted);
System.out.println("decrypted: " + decrypted);
System.out.println("email.equals(decrypted): " + email.equals(decrypted));
}
}