加密和解密

对配置文件进行加密：

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.binary.Base64;

/**
 * 对网站的jdbc配置文件进行加密
 */
public class DESEnctypt {
	
	//生成秘密密钥并将其转换为字符串
	public static String getKeyString() {
		String str = "";
		try {
			KeyGenerator kg = KeyGenerator.getInstance("DES");
			kg.init(56);
			SecretKey secretKey = kg.generateKey();
			byte[] b = secretKey.getEncoded();
			str = Base64.encodeBase64String(b);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return str;
	}
	
	
	
	//执行加密       "KWJ1EMKS76I="：密钥的字符串表现形式 
	public static String execEncrypt(String b2) throws InvalidKeyException, InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
		//String str = getKeyString();
		String str = "KWJ1EMKS76I=";
		byte[] b = Base64.decodeBase64(str);
		DESKeySpec dks = new DESKeySpec(b);
		SecretKeyFactory f = SecretKeyFactory.getInstance("DES");
		SecretKey key = f.generateSecret(dks);
		Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, key);
		byte[] eData = cipher.doFinal(b2.getBytes());
		String s = Base64.encodeBase64String(eData);
		return s;
	}
}

 

 

对配置文件进行解密：

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.log4j.Logger;

/**
 * 对jdbc.properties中的value进行解密
 */
public class DESDecrypt {
	/**
	 * Logger for this class
	 */
	private static final Logger logger = Logger.getLogger(DESDecrypt.class);

	public static String execDecrypt(String bt) {
		if (logger.isDebugEnabled()) {
			logger.debug("execDecrypt(String) - start");
		}
		
		try {
			String str = "KWJ1EMKS76I=";
			byte[] b = Base64.decodeBase64(str);
			DESKeySpec dkc = new DESKeySpec(b);
			SecretKeyFactory f = SecretKeyFactory.getInstance("DES");
			SecretKey key = f.generateSecret(dkc);
			Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
			cipher.init(Cipher.DECRYPT_MODE, key);
			byte[] dData = cipher.doFinal(Base64.decodeBase64(bt));
			//String s = dData.toString();
			String s = new String(dData);

			if (logger.isDebugEnabled()) {
				logger.debug("execDecrypt(String) - end");
			}
			return s;
		} catch (Exception e) {
			logger.error("execDecrypt(String)", e);
			throw new RuntimeException(e);
		}
	}
}