C#SHA-256与Java SHA-256.结果不同？

Java代码：

private static final byte[] SALT = "NJui8*&N823bVvy03^4N".getBytes();

  public static final String getSHA256Hash(String secret)
  {
    try {
      messageDigest digest = messageDigest.geTinstance("SHA-256");
      digest.update(secret.getBytes());
      byte[] hash = digest.digest(SALT);
      StringBuffer hexString = new StringBuffer();
      for (int i = 0; i < hash.length; i++) {
        hexString.append(Integer.toHexString(0xFF & hash[i]));
      }
      return hexString.toString();
    } catch (NoSuchAlgorithmException E) {
      e.printStackTrace();
    } 
    throw new RuntimeException("SHA-256 realization algorithm not found in JDK!");
  }

当我尝试使用the SimpleHash class时,我得到了不同的哈希值

更新：

例如：

Java：byte [] hash = digest.digest(SALT);
生成(前6个字节)：

[0] = 9
[1] = -95
[2] = -68
[3] = 64
[4] = -11
[5] = 53
....

C#代码(类SimpleHash)：
String hashValue = Convert.ToBase64String(hashWithSaltBytes);
hashWithSaltBytes有(前6个字节)：

[0] 175 byte
[1] 209 byte
[2] 120 byte
[3] 74  byte
[4] 74  byte
[5] 227 byte