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;
}
}