AES加密解密方法

AES加密解密方法

/**
         * 加密方法
         * @param data  要加密的数据
         * @param key 加密key
         * @param iv 加密iv
         * @return 加密的结果
         * @throws Exception
         */
        public static String AESEncode(String data, String key, String iv,String type) throws Exception {
            try {
                    if (Util.isEmpty(type)){
                        type="AES/CBC/PKCS5Padding";
                    }
                //根据指定的"算法/模式/补码方式"，获取密码器
                Cipher cipher = Cipher.getInstance(type);//"算法/模式/补码方式"
                int blockSize = cipher.getBlockSize();

                byte[] dataBytes = data.getBytes();
                int plaintextLength = dataBytes.length;
                if (plaintextLength % blockSize != 0) {
                    plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
                }

                byte[] plaintext = new byte[plaintextLength];
                System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

                SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
                IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

                cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
                byte[] encrypted = cipher.doFinal(plaintext);
                System.out.println("dataBytes : "+ByteString.of(dataBytes).hex());
                System.out.println("plaintext : "+ByteString.of(plaintext).hex());
                System.out.println("encrypted : "+ByteString.of(encrypted).hex());
                return new String(Base64.encode(encrypted));

            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }

        /**
         * 解密方法
         * @param data 要解密的数据
         * @param key  解密key
         * @param iv 解密iv
         * @return 解密的结果
         * @throws Exception
         */
        public static String AESDecode(String data, String key, String iv ,String type) throws Exception {
            try {
                if (Util.isEmpty(type)){
                    type="AES/CBC/PKCS5Padding";
                }
                byte[] encrypted1 = new Base64().decode(data);

                Cipher cipher = Cipher.getInstance(type);
                SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
                IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

                cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original);
                return originalString;
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }