Question

现有的SHA-256，如何使用其他或多种不同的数据类型进行更新

    BigInteger d = new BigInteger("773182302672421767750165305491852205951657281488");
    BigInteger r = new BigInteger("1354751385705862203270732046669540660812388894970");
    String R_ID = "id_b";
    String C_ID = "id_b";

    MessageDigest sha_c = MessageDigest.getInstance("SHA-256");
    sha_c.update(r.toByteArray());
    sha_c.update(d.toByteArray());
    sha_c.update(C_ID.getBytes());
    System.out.println(Arrays.toString(sha_c.digest()));

    MessageDigest sha_b = MessageDigest.getInstance("SHA-256");
    sha_b.update(r.toByteArray());
    sha_b.update(d.toByteArray());
    sha_b.update(R_ID.getBytes());
    System.out.println(Arrays.toString(sha_b.digest()));

相同的结果：使用sha_c.update(C_ID.getBytes());

进行更新的结果

[114，-62,50，-44，-118,20，-29,34，-112,99，-17，-6,97，-64， -121,20,30，-55,110,54,9，-90,100,125，-28,75,106，-15，-87，-109，-51,46]

使用sha_b.update(R_ID.getBytes());

进行更新的结果

[114，-62,50，-44，-118,20，-29,34，-112,99，-17，-6,97，-64， -121,20,30，-55,110,54,9，-90,100,125，-28,75,106，-15，-87，-109，-51,46]

Answer 1

你得到了相同的结果，因为你做了两次完全相同的事情。

BigInteger d = new BigInteger("773182302672421767750165305491852205951657281488");
BigInteger r = new BigInteger("1354751385705862203270732046669540660812388894970");
String R_ID = "id_b";
String C_ID = "id_b";

R_ID和C_ID包含相同的值，因此

MessageDigest sha_c = MessageDigest.getInstance("SHA-256");
sha_c.update(r.toByteArray());
sha_c.update(d.toByteArray());
sha_c.update(C_ID.getBytes());
System.out.println(Arrays.toString(sha_c.digest()));

MessageDigest sha_b = MessageDigest.getInstance("SHA-256");
sha_b.update(r.toByteArray());
sha_b.update(d.toByteArray());
sha_b.update(R_ID.getBytes());
System.out.println(Arrays.toString(sha_b.digest()));

两次完全相同。我认为这不是你想要的。

将不同的数据哈希到SHA 256中 - 结果相同

1 个答案: