Python/cryptography/playfire.ipynb

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    "%%HTML\n",
    "<style>.container{width:100%}</style>"
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   "source": [
    "class PlayFire:\n",
    "    def __init__(self,key,extra='x'):\n",
    "        self.key = self.__verify_key(key)\n",
    "        self.key_matrix = self.__make_matrix()\n",
    "        self.extra = extra\n",
    "    def __verify_key(self,key):\n",
    "        keyy = []\n",
    "        for i in key:\n",
    "            if(i not in keyy):\n",
    "                keyy.append(i)\n",
    "        if(len(set(key))==len(key)):\n",
    "            return key\n",
    "        else:\n",
    "            print(\"key Error\")\n",
    "    def __make_matrix(self):\n",
    "        alphanum = list(\"abcdefghijklmnopqrstuvwxyz0123456789\")\n",
    "        key = list(self.key)\n",
    "        xx = key+[i for i in alphanum if i not in key]\n",
    "        mtrx = []\n",
    "        idx = 0\n",
    "        for i in range(6):\n",
    "            t1 = xx[idx:idx+6]\n",
    "            mtrx.append(t1)\n",
    "            idx = idx+6\n",
    "        return mtrx\n",
    "    def find_idx(self,pair):\n",
    "            idxs = [6,6]\n",
    "            for i in range(6):\n",
    "                for j in range(6):\n",
    "                    if(i == 5):\n",
    "                        i = -1\n",
    "                    if(j == 5):\n",
    "                        j = -1\n",
    "                    if(pair[0]==self.key_matrix[i][j]):\n",
    "                        idxs[0] = [i,j]\n",
    "                    if(pair[1]==self.key_matrix[i][j]):\n",
    "                        idxs[1] = [i,j]\n",
    "            return idxs\n",
    "    def encrypt(self,msg:str):\n",
    "        msg = list(msg.lower())\n",
    "        if(len(msg)%2==1):\n",
    "            msg.append(self.extra)\n",
    "        pairs = []\n",
    "        for i in range(0,len(msg),2):\n",
    "            pairs.append(msg[i:i+2])\n",
    "        en_msg=\"\"\n",
    "        for i in pairs:\n",
    "            idxs = self.find_idx(i)\n",
    "            if(idxs[0][0]==idxs[1][0]):\n",
    "                en_m = self.key_matrix[idxs[0][0]][idxs[0][1]+1]+self.key_matrix[idxs[0][0]][idxs[1][1]+1]\n",
    "            elif(idxs[0][1]==idxs[1][1]):\n",
    "                \n",
    "                en_m = self.key_matrix[idxs[0][0]+1][idxs[0][1]]+self.key_matrix[idxs[1][0]+1][idxs[1][1]]\n",
    "            else:\n",
    "                en_m = self.key_matrix[idxs[0][0]][idxs[1][1]]+self.key_matrix[idxs[1][0]][idxs[0][1]]\n",
    "            en_msg += en_m\n",
    "        return en_msg\n",
    "    \n",
    "    def decrypt(self,msg):\n",
    "        msg = list(msg.lower())\n",
    "        if(len(msg)%2==1):\n",
    "            msg.append(self.extra)\n",
    "        pairs = []\n",
    "        for i in range(0,len(msg),2):\n",
    "            pairs.append(msg[i:i+2])\n",
    "        en_msg=\"\"\n",
    "        for i in pairs:\n",
    "            idxs = self.find_idx(i)\n",
    "            if(idxs[0][0]==idxs[1][0]):\n",
    "                en_m = self.key_matrix[idxs[0][0]][idxs[0][1]-1]+self.key_matrix[idxs[0][0]][idxs[1][1]-1]\n",
    "            elif(idxs[0][1]==idxs[1][1]):\n",
    "                en_m = self.key_matrix[idxs[0][0]-1][idxs[0][1]]+self.key_matrix[idxs[1][0]-1][idxs[1][1]]\n",
    "            else:\n",
    "                en_m = self.key_matrix[idxs[0][0]][idxs[1][1]]+self.key_matrix[idxs[1][0]][idxs[0][1]]\n",
    "            en_msg += en_m\n",
    "        return en_msg"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "4b861600",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[['m', 'o', 'n', 'a', 'r', 'c'],\n",
       " ['h', 'y', '1', '2', '3', 'b'],\n",
       " ['d', 'e', 'f', 'g', 'i', 'j'],\n",
       " ['k', 'l', 'p', 'q', 's', 't'],\n",
       " ['u', 'v', 'w', 'x', 'z', '0'],\n",
       " ['4', '5', '6', '7', '8', '9']]"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "pf = PlayFire(key=\"monarchy123\")\n",
    "pf.key_matrix"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "7c4e1caa",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'ydppny3b7u'"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "msg = 'hello1234'\n",
    "enc = pf.encrypt(msg)\n",
    "enc"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "48c8a847",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'hello1234x'"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "pf.decrypt(enc)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "62806ee1",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'thismy1stdayofcollegeilearntabouteverythingandmetmyfriends'"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "pf.decrypt(pf.encrypt(\"thismy1stdayofcollegeilearntabouteverythingandmetmyfriends\"))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "a7a9907b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'rx'"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "pf.decrypt(pf.encrypt('r'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "6fe9dad9",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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