DES encryption key information
First, write a DESUtils class (key information encrypted in the database):
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* Is an encryption algorithm
* @author Administrator
*
*/
Public Class DESUtils {
private static Key key;
private static String KEY_STR = "myKey";
private static String CHARSETNAME = "UTF-8";
private static String ALGORITHM = "DES";
static {
try {
// generate the DES algorithm objects
KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM);
// use SHA1 Security Policy
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
// Set the keys seed
secureRandom.setSeed(KEY_STR.getBytes());
// initialize based on SHA1 algorithm objects
generator.init(secureRandom);
// generate a secret key objects
key = generator.generateKey();
generator = null;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Information after obtaining encrypted
* @Param Cycle
* @return
*/
public static String getEncryptString(String str) {
BASE64Encoder base64encoder = new BASE64Encoder();
try {
byte[] bytes = str.getBytes(CHARSETNAME);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, key);
byte [] doFinal = cipher .doFinal ( bytes );
return base64encoder.encode(doFinal);
} catch (Exception e) {
// TODO: handle exception
throw new RuntimeException(e);
}
}
/**
* Information after acquiring decryption
* @Param Cycle
* @return
*/
public static String getDecryptString(String str) {
// based BASE64 encoded, received byte [] and converted into String
BASE64Decoder base64decoder = new BASE64Decoder();
try {
// string decode into byte []
byte[] bytes = base64decoder.decodeBuffer(str);
// get the object to decrypt
Cipher cipher = Cipher.getInstance(ALGORITHM);
// initialize the decryption information
cipher.init(Cipher.DECRYPT_MODE, key);
// decryption
byte [] doFinal = cipher .doFinal ( bytes );
// return information after decryption
return new String(doFinal, CHARSETNAME);
} catch (Exception e) {
// TODO: handle exception
throw new RuntimeException(e);
}
}
public static void main(String[] args) {
System.out.println(getEncryptString("work1111"));
System.out.println(getEncryptString("Pengliang11111111"));
}
}
Write a EncryptPropertyPlaceholderConfigurer class (decryption key information in the database):
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
public class EncryptPropertyPlaceholderConfigurer extends
PropertyPlaceholderConfigurer {
private String[] encryptPropNames = { "jdbc.username", "jdbc.password" };
@Override
protected String convertProperty(String propertyName, String propertyValue) {
if (isEncryptProp(propertyName)) {
String decryptValue = DESUtils.getDecryptString(propertyValue);
return decryptValue;
} else {
return propertyValue;
}
}
private boolean isEncryptProp(String propertyName) {
for (String encryptpropertyName : encryptPropNames) {
if (encryptpropertyName.equals(propertyName))
return true;
}
return false;
}
}
In the spring-dao.xml file configuration
