toolgood / RCX

The RCX algorithm is improved based on the RC4 algorithm, and performance is almost the same.

RCX算法基于RC4算法改进，性能相差不太。

The RCX algorithm is improved based on the RC4 algorithm, and performance is almost the same.

RCX算法、RCY算法、RC4算法比较 （Comparisons of RCX, RCY and RC4 algorithms ）

编码类型(Encoding)：ASCII

密钥(secret key)：ToolGood

输出数据类型(output data type)：Base64_Url

RC4('ABCDDDDDDDDDDDDDDDDDDDDDD') => mR6mGyRZ9ElDV7acIA3dPq_MAN4CiyW9yA

RC4('ACBDDDDDDDDDDDDDDDDDDDDDD') => mR-nGyRZ9ElDV7acIA3dPq_MAN4CiyW9yA

RC4('CBADDDDDDDDDDDDDDDDDDDDDD') => mx6kGyRZ9ElDV7acIA3dPq_MAN4CiyW9yA

RC4('1234567891234567891234567') => 6W7Wa1UrhzU-IsDrUHyvTdOxdah1-1TPuw

RC4('1234567800034567891234567') => 6W7Wa1UrhzU3I8LrUHyvTdOxdah1-1TPuw

 

RCX('ABCDDDDDDDDDDDDDDDDDDDDDD') => mQQrSDdzTV7_Ys3s0uMpSV3GD55mxHvFfg

RCX('ACBDDDDDDDDDDDDDDDDDDDDDD') => mQXUsAPCJnW082ShRU_UUxFy2_CCGk04Zg

RCX('CBADDDDDDDDDDDDDDDDDDDDDD') => m80-OvKvTV7_Ys3spYaA0HVreSyZrQPZDw

RCX('1234567891234567891234567') => 6TvQKirJa30sDUWQjHVtuSNN_KoGIb7OVQ

RCX('1234567800034567891234567') => 6TvQKirJa30lIP-dpT9y4eJPSNeMzFgrhA


ThreeRCX('ABCDDDDDDDDDDDDDDDDDDDDDD') => P7ZZsw0hmXDGylnYMCmiaISKsvmkQZCNJg

ThreeRCX('ACBDDDDDDDDDDDDDDDDDDDDDD') => TTsrMehtzvOWO7a-KYh9x6GQa36zNj8CTQ

ThreeRCX('CBADDDDDDDDDDDDDDDDDDDDDD') => Vui-aiMNvIK-ozqOUVsSccrM__W6arUJQQ

ThreeRCX('1234567891234567891234567') => sQAd5pyGScLkgfWt5sHaJsCCA_hRafzvgA

ThreeRCX('1234567800034567891234567') => dKT7qYYvWV-xjmLNCoM-HPcHZr-9ecilzg


RCY('ABCDDDDDDDDDDDDDDDDDDDDDD') => RTpQcXF5L-ylWYGeWRf8wMCecXHy4ABlug

RCX('ACBDDDDDDDDDDDDDDDDDDDDDD') => RTsgQRPAgEChJvK2tkMLtg55cXHAR68YBQ

RCY('CBADDDDDDDDDDDDDDDDDDDDDD') => R19cceZXygsOfoDsJm4myqXgwMDAR68YBQ

RCY('1234567891234567891234567') => NWB6fjYys97HT4T3sABUuXS7w5q3HR6PYw

RCY('1234567800034567891234567') => NWB6fjYys97Own-xxp15AgUE60FYsAV_ZQ


ThreeRCY('ABCDDDDDDDDDDDDDDDDDDDDDD') => hSclXtNhUKgh5xD5LyGAp9a4eNH1btHobQ

ThreeRCY('ACBDDDDDDDDDDDDDDDDDDDDDD') => pR9wz1Pm18VHQVFttsYF3ryqR6RtipsVFw

ThreeRCY('CBADDDDDDDDDDDDDDDDDDDDDD') => Z5eewmvC6roXNLKFvzTn8_4IgIjtQco8xQ

ThreeRCY('1234567891234567891234567') => QQHv2CJoIoREo0VRVrH9QFYDl_piBJ9QbA

ThreeRCY('1234567800034567891234567') => ZacKM0jFxevnI39XuSWCxOu1nc4krgC2hA

从上面的代码，可以明显看出RC4算法加密的缺点，而数据经过RCX算法加密后变得无序。

From the above code, you can clearly see the shortcomings of RC4 algorithm encryption,But the data is encrypted by the RCX algorithm and becomes disordered.

测试RCX、RCY算法的性能(Testing the performance of the RCX and RCY algorithm)

数据长度(data length)：10000

加密次数(encryption count)：1000

RCX => 72ms

RCY => 66ms

核心代码（Core code ）

RCX算法采用[明文]与[密文]对密码盘进行调换，并且对 j 进行修改: j=j+[明文]+[密文] 。

The RCX algorithm uses [plain text] and [ciphertext] to swap the cipher disk, and modify j: j = j + [plain text] + [ciphertext].

    public class RCX
    {
         private const int keyLen = 256;
 
        /// <summary>
        /// Encrypt
        /// </summary>
        /// <param name="data"></param>
        /// <param name="pass"></param>
        /// <returns></returns>
        public static byte[] Encrypt(byte[] data, byte[] pass)
        {
            if (data == null) throw new ArgumentNullException("data");
            if (pass == null) throw new ArgumentNullException("pass");

            byte[] mBox = GetKey(pass, keyLen);
            byte[] output = new byte[data.Length];
            int i = 0, j = 0;
            for (int offset = 0; offset < data.Length; offset++) {
                i = (++i) & 0xFF;
                j = (j + mBox[i]) & 0xFF;

                byte a = data[offset];
                byte c = (byte)(a ^ mBox[(mBox[i] + mBox[j]) & 0xFF]);
                output[offset] = c;

                byte temp2 = mBox[c];
                mBox[c] = mBox[a];
                mBox[a] = temp2;
                j = (j + a + c);
            }
            return output;
        }
 
        private static byte[] GetKey(byte[] pass, int kLen)
        {
            byte[] mBox = new byte[kLen];
            for (Int64 i = 0; i < kLen; i++) {
                mBox[i] = (byte)i;
            }
            Int64 j = 0;
            for (Int64 i = 0; i < kLen; i++) {
                j = (j + mBox[i] + pass[i % pass.Length]) % kLen;
                byte temp = mBox[i];
                mBox[i] = mBox[j];
                mBox[j] = temp;
            }
            return mBox;
        }
    }

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