content: package com.ea.dirtysdk;
  
  import lombok.Getter;
  import lombok.Setter;
  
  
  /**
   * Simple Stream Cipher 2
   */
  public class CryptSSC2 {
  
      @Getter
      @Setter
      public static class CryptSSC2T {
          public byte idx;
          public long crc;
          public byte[] sbox = new byte[256];
      }
  
      private static CryptSSC2T _SSC2_Random = new CryptSSC2T();
      private static boolean _SSC2_Init = false;
  
      static final int[] _Cipher_Crc32 = new int[] {
              0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
              0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
              0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
              0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
              0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
              0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
              0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
              0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
              0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
              0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
              0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
              0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
              0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
              0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
              0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
              0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
              0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
              0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
              0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
              0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
              0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
              0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
              0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
              0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
              0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
              0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
              0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
              0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
              0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
              0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
              0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
              0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
      };
  
      /**
       * Init the cipher for use based on key/iter count
       *
       * @param pState cipher state from create
       * @param pKey   key data pointer
       * @param iKey   length of key (-1=assume key is an asciiz string)
       * @param iIter  initialization iteration count (higher is slower but more secure)
       */
      public static void cryptSSC2Init(CryptSSC2T pState, byte[] pKey, int iKey, int iIter) {
          int iIdx;
          long uCrc;
          byte uSwap0, uSwap1;
  
          // if this is the first call, init the random cipher
          if (!_SSC2_Init) {
              _SSC2_Init = true;
              cryptSSC2Init(_SSC2_Random, "hello world".getBytes(), -1, 10);
          }
  
          // if iter is negative, we are adjusting an existing cipher
          if (iIter < 0) {
              iIter = -iIter;
          } else {
              // setup the s-boxes
              for (iIdx = 0; iIdx < 256; ++iIdx) {
                  pState.sbox[iIdx] = (byte)iIdx;
              }
  
              // reset permutators
              pState.idx = 0;
              pState.crc = 0;
          }
  
          // calc key length is they want
          if (iKey < 0) {
              iKey = pKey.length;
          }
  
          // only init if key is valid
          if (iKey > 0) {
              uCrc = 0;
              // do iteration * 256 times
              for (iIdx = 0; iIdx < iIter*256; ++iIdx) {
                  // generate a crc sequence from key sequence
                  uCrc = ((uCrc >> 8) ^ _Cipher_Crc32[(int)(uCrc & 0xFF) ^ (pKey[iIdx % iKey] & 0xFF)]) & 0xFFFFFFFFL;
                  // put sbox data into crc
                  uCrc = ((uCrc >> 8) ^ _Cipher_Crc32[(int)(uCrc & 0xFF) ^ (pState.sbox[iIdx % 256] & 0xFF)]) & 0xFFFFFFFFL;
                  // use crc and index to swap sbox entries
                  uSwap0 = pState.sbox[iIdx % 256];
                  uSwap1 = pState.sbox[(int)(uCrc & 0xFF)];
                  pState.sbox[iIdx % 256] = uSwap1;
                  pState.sbox[(int)(uCrc & 0xFF)] = uSwap0;
              }
          }
      }
  
      /**
       * Apply the cipher to the target data. Uses xor so the process is reversible.
       *
       * @param pState cipher state from create
       * @param pData  pointer to data to apply cipher to
       * @param iData  length of target data
       */
      public static void cryptSSC2Apply(CryptSSC2T pState, byte[] pData, int iData) {
          byte uSwap0, uSwap1;
          byte iIdx = pState.getIdx();
          long uCrc = pState.getCrc();
  
          // process each data byte
          for (; iData > 0; --iData) {
              // put sbox data into crc
              uCrc = ((uCrc >> 8) ^ _Cipher_Crc32[(int)(uCrc & 0xFF) ^ (pState.getSbox()[iIdx++ & 0xFF] & 0xFF)]) & 0xFFFFFFFFL;
  
              // swap the s-boxes entries
              uSwap0 = pState.getSbox()[iIdx & 0xFF];
              uSwap1 = pState.getSbox()[(int)(uCrc & 0xFF)];
              pState.getSbox()[iIdx & 0xFF] = uSwap1;
              pState.getSbox()[(int)(uCrc & 0xFF)] = uSwap0;
  
              // use swap data to index into sboxes
              pData[iData-1] ^= pState.getSbox()[(uSwap0-uSwap1)&0xFF];
          }
  
          // update state
          pState.setIdx(iIdx);
          pState.setCrc(uCrc);
      }
  
      /**
       * Easy way to encode an asciiz string. The resulting string is iLen chars of visible
       * ascii characters.
       *
       * @param pDst  pointer to output string
       * @param iLen  length of output string
       * @param pSrc  pointer to source string (asciiz)
       * @param pKey  key to encrypt with
       * @param iKey  length of key (-1=key is asciiz)
       * @param iIter number of initialization iterations
       * @return success
       */
      public static int cryptSSC2StringEncrypt(byte[] pDst, int iLen, byte[] pSrc, byte[] pKey, int iKey, int iIter) {
          int iSum;
          CryptSSC2T ref = new CryptSSC2T();
          byte uDat = 0;
          byte uEnc = 0;
  
          // setup initial state
          cryptSSC2Init(ref, pKey, iKey, iIter);
  
          // update the random cipher
          cryptSSC2Init(_SSC2_Random, pKey, iKey, -iIter);
          cryptSSC2Init(_SSC2_Random, "ru paranoid?".getBytes(), -1, -1);
  
          // encrypt the string
          for (int i = 0; i < iLen - 1; ++i) {
              // get source data
              if (pSrc == null || i >= pSrc.length) {
                  // append random fill data
                  byte[] uDatArray = new byte[]{uDat};
                  cryptSSC2Apply(_SSC2_Random, uDatArray, 1);
                  uDat = uDatArray[0];
                  // fix the range
                  uDat = (byte)(32 + (uDat & 63));
              } else {
                  uDat = pSrc[i];
                  if (uDat == 0) {
                      pSrc = null;
                  }
              }
  
              // deal with out of range data
              if ((uDat & 0xFF) < 32 || (uDat & 0xFF) >= 127) {
                  uDat = 127;
              }
  
              // get cipher character
              byte[] uEncArray = new byte[]{uEnc};
              cryptSSC2Apply(ref, uEncArray, 1);
              uEnc = uEncArray[0];
  
              // encode the data
              iSum = (96 - 32) + Byte.toUnsignedInt(uDat) + (Byte.toUnsignedInt(uEnc) % 96);
              pDst[i] = (byte)(32 + (iSum % 96));
          }
  
          // terminate buffer
          if (iLen > 0) {
              pDst[iLen - 1] = 0;
          }
  
          return 0;
      }
  
      /**
       * Easy way to decode an asciiz string. The resulting string is iLen chars of visible
       * ascii characters.
       *
       * @param pDst  pointer to output string
       * @param iLen  length of output string
       * @param pSrc  pointer to source string (asciiz)
       * @param pKey  key to decrypt with
       * @param iKey  length of key (-1=key is asciiz)
       * @param iIter number of initialization iterations
       * @return success
       */
      public static int cryptSSC2StringDecrypt(byte[] pDst, int iLen, byte[] pSrc, byte[] pKey, int iKey, int iIter) {
          int iIdx;
          int iSum;
          CryptSSC2T ref = new CryptSSC2T();
          byte uDat = 0;
          byte uDec = 0;
  
          // setup initial state
          cryptSSC2Init(ref, pKey, iKey, iIter);
  
          // decrypt the string
          for (iIdx = 0; iIdx < iLen - 1; ++iIdx) {
              // get encoded source
              if (iIdx >= pSrc.length || (uDat = pSrc[iIdx]) == 0) {
                  break;
              }
  
              // get cipher character
              byte[] uDecArray = new byte[]{uDec};
              cryptSSC2Apply(ref, uDecArray, 1);
              uDec = uDecArray[0];
  
              // decode the data
              iSum = (96 - 32) + Byte.toUnsignedInt(uDat) - (Byte.toUnsignedInt(uDec) % 96);
              pDst[iIdx] = (byte)(32 + (iSum % 96));
              if (pDst[iIdx] == 127) {
                  break;
              }
          }
  
          // terminate buffer
          if (iIdx < iLen) {
              pDst[iIdx] = 0;
          }
  
          return 0;
      }
  
  }
  