Question

我正在使用来自http://tools.ietf.org/html/rfc4231

的测试向量测试我的Hmac

但是在测试用例3“使用大于64字节的密钥和数据的组合长度进行测试（= SHA-224和SHA-256的块大小）。”我得到的摘要与正确的摘要不同。

byte[] key = hexify("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
byte[] data = hexify("dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd");
byte[] correct = hexify("773ea91e36800e46854db8ebd09181a72959098b3ef8c122d9635514ced565fe");

// Create digest
SecretKey macKey = new SecretKeySpec(key, "HmacSHA256");
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(macKey);
byte[] digest = mac.doFinal(data);

知道为什么他们会变得不同吗？我错过了什么？我对此很陌生。

// Hex encoded
a5418172bb54bf71f3ec28d1c9f34c48da17007eac4d0ca9e2f8ab54b91603e8
773ea91e36800e46854db8ebd09181a72959098b3ef8c122d9635514ced565fe

Answer 1

我无法重现您的问题。对我来说，以下SSCCE工作得很好：

public static void main(String[] args) throws Exception {
  byte[] key = hexify("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
  byte[] data = hexify("dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd");
  byte[] correct = hexify("773ea91e36800e46854db8ebd09181a72959098b3ef8c122d9635514ced565fe");

  // Create digest
  SecretKey macKey = new SecretKeySpec(key, "HmacSHA256");
  Mac mac = Mac.getInstance("HmacSHA256");
  mac.init(macKey);
  byte[] digest = mac.doFinal(data);
  System.out.println(Arrays.equals(correct, digest));    
}

private static byte[] hexify(String string) {
  return DatatypeConverter.parseHexBinary(string);
}

打印：true

显示或比较代码中可能出现错误？

测试HmacSHA256签名

1 个答案: