关于AES的使用

我不是女神ヾ 2022-08-21 06:41 209阅读 0赞

private static String charset = "UTF-8";
    		
    		private static final String KEY_ALGORITHM = "AES/ECB/PKCS5Padding";
    		
    		private static final String AES = "AES";
    
    		private static final byte[] KEY_BYTE_ARR = { (byte) 0x1d, (byte) 0x51, (byte) 0xa7, (byte) 0xc5, (byte) 0x27, (byte) 0x3b,
    				(byte) 0x39, (byte) 0xe0, (byte) 0xfa, (byte) 0x72, (byte) 0xd0, (byte) 0x29, (byte) 0x83, (byte) 0x65,
    				(byte) 0x9d, (byte) 0x74 };
    		
    		/**
    		 * AES加密
    		 * @param encryptContent 加密文本
    		 * @param key 密钥
    		 * @return 返回经过base64编码的文本
    		 */
    		public static String encrypt(String encryptContent, String key) {
    			
    			try {
    				
    				Cipher cipher = Cipher.getInstance(KEY_ALGORITHM);
    				
    				cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(editKey(key), AES));
    				
    				byte[] bytes = cipher.doFinal(encryptContent.getBytes(charset));
    				
    				return Base64.encodeBase64String(bytes);
    			} catch(Exception e) {
    				e.printStackTrace();
    				return null;
    			}
    		}
    		
    		/**
    		 * AES解密
    		 * @param decryptContent Base64 编码的密文
    		 * @param key 密钥
    		 * @return 返回原文文本
    		 */
    		public static String decrypt(String decryptContent,String key) {
    			try {
    				Cipher cipher = Cipher.getInstance(KEY_ALGORITHM);
    				
    				cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(editKey(key),AES));
    				
    				byte[] bytes = Base64.decodeBase64(decryptContent);
    				
    				bytes = cipher.doFinal(bytes);
    				
    				return new String(bytes, charset);
    				
    			} catch(Exception e) {
    				e.printStackTrace();
    				return null;
    			}
    		}
    		
    		/**
    		 * 用于填充key填补出现的异常
    		 * @param key
    		 * @return
    		 */
    		private static byte[] editKey(String key) {		
    			
    			byte[] key64 = key.getBytes();
    			
    			byte[] buff = new byte[KEY_BYTE_ARR.length];
    			
    			if (key64.length < KEY_BYTE_ARR.length) {
    				for (int i = 0; i < KEY_BYTE_ARR.length; i++) {
    					if (key64.length - 1 >= i) {
    						buff[i] = key64[i];
    					}else{
    						buff[i] = KEY_BYTE_ARR[i];
    					}
    				}
    			}
    			return buff;
    		}

直接记录下来以便下次使用