The hashCode() doesn't depend on the relative order of the bytes in the underlying array.

    Cache.EqualByteArray a1 = new Cache.EqualByteArray(new byte[] {1,2,3});
    Cache.EqualByteArray a2 = new Cache.EqualByteArray(new byte[] {2,3,1});
    Cache.EqualByteArray a3 = new Cache.EqualByteArray(new byte[] {3,1,2});
    System.out.println(a1.hashCode());
    System.out.println(a2.hashCode());
    System.out.println(a3.hashCode());

Prints
226
226
226

It may be better to use Arrays.hashCode(byte[]).