RC4加密这样写对吗？

rleo102030 2018-02-28 05:50:41



class  RC4

{

    private static byte[] initKey(String aKey) {

        byte[] b_key = aKey.getBytes();

        byte state[] = new byte[256];



        for (int i = 0; i < 256; i++) {

            state[i] = (byte) i;

        }

        int index1 = 0;

        int index2 = 0;

        if (b_key == null || b_key.length == 0) {

            return null;

        }

        for (int i = 0; i < 256; i++) {

            index2 = ((b_key[index1] & 0xff) + (state[i] & 0xff) + index2) & 0xff;

            byte tmp = state[i];

            state[i] = state[index2];

            state[index2] = tmp;

            index1 = (index1 + 1) % b_key.length;

        }

        return state;

    }

    private static byte[] RC4Base (byte [] input, String mKkey) {

        int x = 0;

        int y = 0;

        byte key[] = initKey(mKkey);

        int xorIndex;

        byte[] result = new byte[input.length];



        for (int i = 0; i < input.length; i++) {

            x = (x + 1) & 0xff;

            y = ((key[x] & 0xff) + y) & 0xff;

            byte tmp = key[x];

            key[x] = key[y];

            key[y] = tmp;

            xorIndex = ((key[x] & 0xff) + (key[y] & 0xff)) & 0xff;

            result[i] = (byte) (input[i] ^ key[xorIndex]);

        }

        return result;

    }

    public static String jiami(String str1,String key,String charset1)

    {

        String num = "";

        try {

            byte[] bby= str1.getBytes(charset1);

            byte[] by  = RC4Base(bby, key);

            char[] arrayOfChar = new char[16];

            char[] tmpArryOfChar = arrayOfChar;

            tmpArryOfChar[0] = 48;

            char[] tmp37_32 = tmpArryOfChar;

            tmp37_32[1] = 49;

            char[] tmp42_37 = tmp37_32;

            tmp42_37[2] = 50;

            char[] tmp47_42 = tmp42_37;

            tmp47_42[3] = 51;

            char[] tmp52_47 = tmp47_42;

            tmp52_47[4] = 52;

            char[] tmp57_52 = tmp52_47;

            tmp57_52[5] = 53;

            char[] tmp62_57 = tmp57_52;

            tmp62_57[6] = 54;

            char[] tmp68_62 = tmp62_57;

            tmp68_62[7] = 55;

            char[] tmp74_68 = tmp68_62;

            tmp74_68[8] = 56;

            char[] tmp80_74 = tmp74_68;

            tmp80_74[9] = 57;

            char[] tmp86_80 = tmp80_74;

            tmp86_80[10] = 65;

            char[] tmp92_86 = tmp86_80;

            tmp92_86[11] = 66;

            char[] tmp98_92 = tmp92_86;

            tmp98_92[12] = 67;

            char[] tmp104_98 = tmp98_92;

            tmp104_98[13] = 68;

            char[] tmp110_104 = tmp104_98;

            tmp110_104[14] = 69;

            char[] tmp116_110 = tmp110_104;

            tmp116_110[15] = 70;

            int k = by.length; // int k = paramString1.length;

            char[] paramString2 = new char [k*2]; //paramString2 = new char[k * 2];

            int j = 0;

            int i = 0;

            while (j < k)

            {

                int m = by[j];

                int n = i + 1;

                paramString2[i] = ((char)arrayOfChar[(m >>> 4 & 0xF)]);

                i = n + 1;

                paramString2[n] = ((char)arrayOfChar[(m & 0xF)]);

                j++;

            }

            //paramString1 = new java/lang/String;

            //paramString1.<init>(paramString2);

            num= String.valueOf(paramString2);



        } catch (Exception e)

        {

            // TODO: handle exception

            Log.d("pgq",e.getMessage());

        }

        return num;

    }

}