测试HmacSHA256签名

Question

我正在用来自https://www.rfc-editor.org/rfc/rfc4231的测试向量测试我的Hmac。

但是在测试用例3上，“测试密钥和数据的组合长度大于64字节(= 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);

你知道为什么它们会变得不同吗？我错过了什么？我对此非常陌生。

// Hex encoded
a5418172bb54bf71f3ec28d1c9f34c48da17007eac4d0ca9e2f8ab54b91603e8
773ea91e36800e46854db8ebd09181a72959098b3ef8c122d9635514ced565fe

Answer 1

我不能复制你的问题。对我来说，下面的SSCCE运行得很好：

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);
}

印刷品：true

可能是显示或比较代码中的错误？