将byte []附加到另一个byte []的末尾 [英] Appending a byte[] to the end of another byte[]

问题描述

我有两个长度未知的 byte [] 数组，我只想将一个附加到另一个的末尾，即：

I have two byte[] arrays which are of unknown length and I simply want to append one to the end of the other, i.e.:

byte[] ciphertext = blah;
byte[] mac = blah;
byte[] out = ciphertext + mac;

我尝试过使用 arraycopy（）但是似乎无法让它发挥作用。

I have tried using arraycopy() but can't seem to get it to work.

推荐答案

使用 System.arraycopy（） ，类似以下内容应该有效：

Using System.arraycopy(), something like the following should work:

// create a destination array that is the size of the two arrays
byte[] destination = new byte[ciphertext.length + mac.length];

// copy ciphertext into start of destination (from pos 0, copy ciphertext.length bytes)
System.arraycopy(ciphertext, 0, destination, 0, ciphertext.length);

// copy mac into end of destination (from pos ciphertext.length, copy mac.length bytes)
System.arraycopy(mac, 0, destination, ciphertext.length, mac.length);

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