Java AES 256 加密

Question

我有下面的 java 代码来加密一个使用 64 字符密钥的字符串。我的问题是这将是 AES-256 加密吗？

String keyString = "C0BAE23DF8B51807B3E17D21925FADF273A70181E1D81B8EDE6C76A5C1F1716E";
byte[] keyValue = hexStringToByte(keyString);
Key key = new SecretKeySpec(keyValue, "AES");
Cipher c1 = Cipher.getInstance("AES");
c1.init(Cipher.ENCRYPT_MODE, key);

String data = "Some data to encrypt";
byte[] encVal = c1.doFinal(data.getBytes());
String encryptedValue = Base64.encodeBase64String(encVal);


/* Copied the below code from another post in stackexchange */
public static byte[] hexStringToByte(String hexstr) 
{
  byte[] retVal = new BigInteger(hexstr, 16).toByteArray();
  if (retVal[0] == 0) 
  {
    byte[] newArray = new byte[retVal.length - 1];
    System.arraycopy(retVal, 1, newArray, 0, newArray.length);
    return newArray;
  }
  return retVal;
}

以下是合并divanov和laz的建议后的代码。

String keyString = "C0BAE23DF8B51807B3E17D21925FADF273A70181E1D81B8EDE6C76A5C1F1716E";
byte[] keyValue = DatatypeConverter.parseHexBinary(keyString);
Key key = new SecretKeySpec(keyValue, "AES");
Cipher c1 = Cipher.getInstance("AES");
c1.init(Cipher.ENCRYPT_MODE, key);

String data = "Some data to encrypt";
byte[] encVal = c1.doFinal(data.getBytes());
String encryptedValue = Base64.encodeBase64String(encVal);

Answer 1

是的，因为 64 个字符是 32 字节和 256 位，任何 256 位序列都可以用作 AES-256 密钥。

我建议您使用DatatypeConverter.parseHexBinary（或您选择的库中的类似实用程序）将十六进制字符串转换为字节数组。