AESHelper 工具类

 1. AESHelper 工具类

package com.szmsd.common.security;
import java.security.SecureRandom;  

import javax.crypto.Cipher;  
import javax.crypto.KeyGenerator;  
import javax.crypto.SecretKey;  
import javax.crypto.spec.SecretKeySpec;  

/**
 * @FileName AESHelper.java
 * @Description: AES加密器 
 *
 * 
 */
public class AESHelper {  
    /** 
     * AES加密 
     */  
    public static String encrypt(String seed, String cleartext)  
            throws Exception {  
        byte[] rawKey = getRawKey(seed.getBytes());  
        byte[] result = encrypt(rawKey, cleartext.getBytes());  
        return toHex(result);  
    }  

    /** 
     * AES解密 
     */  
    public static String decrypt(String seed, String encrypted)  
            throws Exception {  
        if (seed == null || "".equals(seed) || encrypted == null || "".equals(encrypted)){  
            return null;  
        }  
        byte[] rawKey = getRawKey(seed.getBytes());  
        byte[] enc = toByte(encrypted);  
        byte[] result = decrypt(rawKey, enc);  
        return new String(result);  
    }  

    private static byte[] getRawKey(byte[] seed) throws Exception {  
        KeyGenerator kgen = KeyGenerator.getInstance("AES");  
        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");  
        sr.setSeed(seed);  
        kgen.init(128, sr); // 192 and 256 bits may not be available  
        SecretKey skey = kgen.generateKey();  
        byte[] raw = skey.getEncoded();  
        return raw;  
    }  

    private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {  
        if (raw == null || clear == null){  
            return null;  
        }  
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");  
        Cipher cipher = Cipher.getInstance("AES");  
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);  
        byte[] encrypted = cipher.doFinal(clear);  
        return encrypted;  
    }  

    private static byte[] decrypt(byte[] raw, byte[] encrypted)  
            throws Exception {  
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");  
        Cipher cipher = Cipher.getInstance("AES");  
        cipher.init(Cipher.DECRYPT_MODE, skeySpec);  
        byte[] decrypted = cipher.doFinal(encrypted);  
        return decrypted;  
    }  

    public static String toHex(String txt) {  
        return toHex(txt.getBytes());  
    }  

    public static String fromHex(String hex) {  
        return new String(toByte(hex));  
    }  

    public static byte[] toByte(String hexString) {  
        if (hexString == null || "".equals(hexString)){  
            return null;  
        }  
        int len = hexString.length() / 2;  
        byte[] result = new byte[len];  
        for (int i = 0; i < len; i++) {  
            result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue();  
        }  
        return result;  
    }  

    public static String toHex(byte[] buf) {  
        if (buf == null)  
            return "";  
        StringBuffer result = new StringBuffer(2 * buf.length);  
        for (int i = 0; i < buf.length; i++) {  
            appendHex(result, buf[i]);  
        }  
        return result.toString();  
    }  

    private final static String HEX = "0123456789ABCDEFGHIJKLNMOPQRSTUVWSYZ";  

    private static void appendHex(StringBuffer sb, byte b) {  
        sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));  
    }  
    
    public static void main(String[] args) throws Exception {
		String key = "abc123def456ghi789dsfsfaf24142342414";
		
		String dbUrl="jdbc:oracle:thin:@192.168.100.211:1521:orcl";
		String dbUser="javatest";
		String dbPassword="oracle";
		String encryptDbUrl = encrypt(key, dbUrl);
		String encryptDbUser = encrypt(key, dbUser);
		String encryptDbPassword = encrypt(key, dbPassword);
		System.out.println("--------加密后的字符串:");
		System.out.println(encryptDbUrl);
		System.out.println(encryptDbUser);
		System.out.println(encryptDbPassword);
		String decryptDbUrl = decrypt(key, encryptDbUrl);
		String decryptDbUser = decrypt(key, encryptDbUser);
		String decryptDbPassword = decrypt(key, encryptDbPassword);
		System.out.println("--------解密后的字符串:");
		System.out.println(decryptDbUrl);
		System.out.println(decryptDbUser);
		System.out.println(decryptDbPassword);
		
		
//		String mypassword="jdbc:oracle:thin:@192.168.100.211:1521:orcl";
//		String encryptPassword = encrypt(key, mypassword);
//		System.out.println("--------加密后的字符串:");
//		System.out.println(encryptPassword);
//		String decryptPassword=decrypt(key, encryptPassword);
//		System.out.println("--------解密后的字符串:");
//		System.out.println(decryptPassword);
	}
    
}  

 2. 使用附件中的工具方便使用与检测
首先下载AesTools.jar文件，然后在同一目录新建一个AesRun.bat文件，内容如下：

java -jar AesTools.jar

@echo off
pause
exit

 双击运行，弹出命令框：

 输入1后，出现请输入加密解密KEY:
输入相应的KEY回车之后，请输入要加密或解密的内容:
输入相应的内容回车之后出现如下图：