AES加密解密

由于项目需要，所以最近看了下AES的加密解密，话不多说，直接看实现：

加密：

// 加密
	private static byte[] encrypt(String content, String password) {
		try {
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			kgen.init(128, new SecureRandom(password.getBytes()));
			SecretKey secretKey = kgen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 创建密码器
			byte[] byteContent = content.getBytes("utf-8");
			cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(byteContent);
			return result; // 加密
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		}
		return null;
	}
	
	
	/**将二进制转换成16进制   加密
	 * @param buf 
	 * @return 
	 */  
	public static String parseByte2HexStr(byte buf[]) {  
	        StringBuffer sb = new StringBuffer();  
	        for (int i = 0; i < buf.length; i++) {  
	                String hex = Integer.toHexString(buf[i] & 0xFF);  
	                if (hex.length() == 1) {  
	                        hex = '0' + hex;  
	                }  
	                sb.append(hex.toUpperCase());  
	        }  
	        return sb.toString();  
	}  
	 

解密：

//解密
		private static  byte[] decrypt(byte[] account, String password) {  
	        try {  
	                 KeyGenerator kgen = KeyGenerator.getInstance("AES");  
	                 kgen.init(128, new SecureRandom(password.getBytes()));  
	                 SecretKey secretKey = kgen.generateKey();  
	                 byte[] enCodeFormat = secretKey.getEncoded();  
	                 SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");              
	                 Cipher cipher = Cipher.getInstance("AES");// 创建密码器   
	                cipher.init(Cipher.DECRYPT_MODE, key);// 初始化   
	                byte[] result = cipher.doFinal(account);  
	                return result; // 加密   
	        } catch (NoSuchAlgorithmException e) {  
	                e.printStackTrace();  
	        } catch (NoSuchPaddingException e) {  
	                e.printStackTrace();  
	        } catch (InvalidKeyException e) {  
	                e.printStackTrace();  
	        } catch (IllegalBlockSizeException e) {  
	                e.printStackTrace();  
	        } catch (BadPaddingException e) {  
	                e.printStackTrace();  
	        }  
	        return null;  
	}  
	 
	/**将16进制转换为二进制   ——解密
	 * @param hexStr 
	 * @return 
	 */  
	public static byte[] parseHexStr2Byte(String hexStr) {  
	        if (hexStr.length() < 1)  
	                return null;  
	        byte[] result = new byte[hexStr.length()/2];  
	        for (int i = 0;i< hexStr.length()/2; i++) {  
	                int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);  
	                int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);  
	                result[i] = (byte) (high * 16 + low);  
	        }  
	        return result;  
	}  

客户端测试：

        String content = "cdjzbdd";
	String addPwd = "123456";  //约定公共的加密密码
		
	//加密
	System.out.println("加密前：" + content);  
	byte[] enAccount = encrypt(content, addPwd);
	String encryptResultStr = parseByte2HexStr(enAccount);  
	System.out.println("加密后：" + encryptResultStr);  
		
	//解密   
	byte[] decryptFrom = parseHexStr2Byte(encryptResultStr);  
	byte[] decryptResult = decrypt(decryptFrom,addPwd);  
	System.out.println("解密后：" + new String(decryptResult));  

运行结果：