WinRAR-Keygen

1. What is WinRAR?

• WinRAR is a trialware file archiver utility for Windows, developed by Eugene Roshal of win.rar GmbH.

• It can create and view archives in RAR or ZIP file formats and unpack numerous archive file formats.

• WinRAR is not a free software. If you want to use it, you should pay to RARLAB and then you will get a license file named "rarreg.key".

• This repository will tell you how WinRAR license file "rarreg.key" is generated.

2. How is "rarreg.key" generated?

• WinRAR uses a signature algorithm, which is a variant of Chinese SM2 digital signature algorithm, to process the user's name and the license type he/she got. Save the result to "rarreg.key" and add some header info, then a license file is generated.

• The following will talk about the detail of the signature algorithm that WinRAR uses and how WinRAR process the user's name and his/her license type.

  2.1. Signature Algorithm

  • WinRAR uses ECC (Elliptic-curve Cryptography) to do signature. The elliptic curve it uses is over a composite finite field where the primitive polynomial of base finite field is:

  

  • And the primitive polynomial of extend finite field is:

  

  • The elliptic curve equation is:

  

  • Let be base point that will be used during signature. The exact value is:

    auto G = ecCurve.GetPoint({           // X, represents a polynomial 
      0x38CC, 0x052F, 0x2510, 0x45AA,   // over GF((2 ^ 15) ^ 17), the first term  
      0x1B89, 0x4468, 0x4882, 0x0D67,   // is in the front.
      0x4FEB, 0x55CE, 0x0025, 0x4CB7,
      0x0CC2, 0x59DC, 0x289E, 0x65E3,
      0x56FD
    }, {                                  // Y, represents a polynomial 
      0x31A7, 0x65F2, 0x18C4, 0x3412,   // over GF((2 ^ 15) ^ 17), the first term  
      0x7388, 0x54C1, 0x539B, 0x4A02,   // is in the front.
      0x4D07, 0x12D6, 0x7911, 0x3B5E,
      0x4F0E, 0x216F, 0x2BF2, 0x1974,
      0x20DA
    });

  • is the order that will be used during signature. The exact value is:

    const uint64_t P[4] = {   // P = 0x1026dd85081b82314691ced9bbec30547840e4bf72d8b5e0d258442bbcd31
        0x5e0d258442bbcd31,
        0x0547840e4bf72d8b,
        0x2314691ced9bbec3,
        0x0001026dd85081b8
    };

    2.1.1 The Generation of PrivateKey , Random Number and Hash

    • To generate PrivateKey , random number and hash , we need two byte-arrays. We call them in_data and in_private. Their length is in_data_length and in_private_length respectively.

    • is generated by in_private.
      is generated by in_data.
      is generated by both in_data and in_private.

      For better understanding, here I give an case:

      byte in_private[7] = { 'P', 'h', 'a', 'n', 't', 'o', 'm' }; 
      byte in_data[9] = { 'L', 'a', 'b', 'y', 'r', 'i', 'n', 't', 'h' }; 

      where in_private_length is 7 and in_data_length is 9.

      2.1.1.1 The Generation of .

      • Calculate in_private's SHA-1 digest.

        In the case I give, it should be:

        byte in_private_sha1[] = {        //  standard sha-1 value is : {
            0xc0, 0x16, 0x3f, 0x02,       //      0x02, 0x3f, 0x16, 0xc0, 
            0x78, 0x4b, 0xac, 0x8c,       //      0x8c, 0xac, 0x4b, 0x78, 
            0xaf, 0x97, 0x0d, 0xe6,       //      0xe6, 0x0d, 0x97, 0xaf, 
            0xd9, 0x46, 0xa4, 0x91,       //      0x91, 0xa4, 0x46, 0xd9, 
            0xdc, 0xb3, 0xbf, 0x06        //      0x06, 0xbf, 0xb3, 0xdc
        };                                //  }

        NOTICE: Compared with standard SHA-1 calculation, WinRAR reversed each 32-bits block.

        If in_private is null, use default value:

        byte in_private_sha1[] = { 
            0x81, 0xb7, 0x3e, 0xeb, 
            0x29, 0x53, 0x26, 0x50, 
            0xa3, 0xf4, 0x5e, 0xdc, 
            0xd5, 0xb9, 0x47, 0x68, 
            0x4c, 0x3b, 0xe4, 0xcd 
        };

        It is probably the SHA-1 digest of some secret data used in RARLAB

      • To get each part of , do 15 rounds of SHA-1 calculation:

        1. Let i be uint32_t varing from 1 to 15.

        2. In each round, we calculate the SHA-1 digest of a 24-bytes-long byte-array which is the combination of i (little-endian) and src_data_sha1. Then take the first two bytes and append them at the end of .

      • After that, should be a 30-bytes-long and its value is:

        

        In the case I give, is:

        byte PrivateKey[30] = {       // PrivateKey = 0xb7e256217a67f14e3fb4246e889ea18b69b246616e04525e96d515831f2a  
            0x2a, 0x1f, 0x83, 0x15,   // which is a 240-bits-long integer.
            0xd5, 0x96, 0x5e, 0x52, 
            0x04, 0x6e, 0x61, 0x46, 
            0xb2, 0x69, 0x8b, 0xa1, 
            0x9e, 0x88, 0x6e, 0x24, 
            0xb4, 0x3f, 0x4e, 0xf1, 
            0x67, 0x7a, 0x21, 0x56, 
            0xe2, 0xb7 
        };

        In my code I use a uint64_t[4] array to store it.

      2.1.1.2 The Generation of and .

      • During the generation of , there is a temporary 24-bytes-long byte-array. After all of the 15 rounds, the temporary byte-array should be the combination of uint32_t(15) (little endian) and src_data_sha1.

        In the case I give, it should be:

        byte in_private_sha1_temp[] = { 
            0x0f, 0x00, 0x00, 0x00, 
            0xc0, 0x16, 0x3f, 0x02,  
            0x78, 0x4b, 0xac, 0x8c,  
            0xaf, 0x97, 0x0d, 0xe6,  
            0xd9, 0x46, 0xa4, 0x91, 
            0xdc, 0xb3, 0xbf, 0x06 
        };

      • Calculate in_data's SHA-1 digest:

        In the case I give, it should be:

        byte in_data_sha1[] = { 
            0xfc, 0x0e, 0xcd, 0xba, 
            0x12, 0xa0, 0xc6, 0x2e, 
            0x96, 0xf6, 0xbe, 0xdb, 
            0x9f, 0x89, 0x72, 0x10, 
            0x05, 0x05, 0x71, 0xe0 
        };

      • Append

        byte empty_sha1[] = { 
            0x43, 0x8d, 0xfd, 0x0f, 
            0x7c, 0x3c, 0xe3, 0xb4, 
            0xd1, 0x1b, 0x46, 0x53, 
            0x46, 0xa5, 0x27, 0x0f, 
            0x0d, 0xd9, 0x50, 0x10
        };

        at the end of in_data_sha1 so we can get byte-array (in_data_sha1 + empty_sha1). The byte-array appended is the SHA-1 digest of null while 5 SHA-1 initial constants is set 0. Then take the first 30 bytes of (in_data_sha1 + empty_sha1) as .

      • Append (in_data_sha1 + empty_sha1) at the end of in_private_sha1_temp.

        In the case I give, it should be:

        byte in_private_sha1_temp[] = { 
            0x0f, 0x00, 0x00, 0x00,   // original in_private_sha1_temp.
            0xc0, 0x16, 0x3f, 0x02,  
            0x78, 0x4b, 0xac, 0x8c,  
            0xaf, 0x97, 0x0d, 0xe6,  
            0xd9, 0x46, 0xa4, 0x91, 
            0xdc, 0xb3, 0xbf, 0x06, 
            0xfc, 0x0e, 0xcd, 0xba,   // in_data_sha1
            0x12, 0xa0, 0xc6, 0x2e, 
            0x96, 0xf6, 0xbe, 0xdb, 
            0x9f, 0x89, 0x72, 0x10, 
            0x05, 0x05, 0x71, 0xe0,
            0x43, 0x8d, 0xfd, 0x0f,   // empty_sha1
            0x7c, 0x3c, 0xe3, 0xb4, 
            0xd1, 0x1b, 0x46, 0x53, 
            0x46, 0xa5, 0x27, 0x0f, 
            0x0d, 0xd9, 0x50, 0x10
        };

      • To get each part of , do 15 rounds of SHA-1 calculation.
        In each round, do

        ++*reinterpreter_cast<uint32_t*>(in_private_sha1_temp);

        first, then calculate the SHA-1 digest of in_private_sha1_temp and append the first two bytes of the digest at the end of .

        In the case I give, it should be:

        byte K[] = { 
            0xeb, 0xed, 0x4f, 0xba, 
            0x0b, 0x30, 0xe8, 0x26, 
            0xf4, 0xec, 0xe6, 0x92, 
            0x76, 0xcc, 0xe8, 0x0b, 
            0xa8, 0x9c, 0x6f, 0x3a, 
            0x41, 0x6d, 0x5c, 0xfe, 
            0x21, 0x42, 0x5a, 0x5a, 
            0x5d, 0xbe
        };

        In my code I use a uint64_t[4] array to store it.

    2.1.2 The Generation of Singnature and PublicKey

    • Now we have PrivateKey , random number , hash , order and base point .

    • 

      NOTICE:

      1. The dot in refers to the elliptic curve point multiplication on over .

      2. means takeing X-axis value of a point. This value is a polynomial over .

      3. Function converts a polynomial over to a integer whose bit length would not larger than 15 * 17 = 255. The detail of function will be talked about later.

      4. is integer addition.

    • 

      NOTICE:

      1. is integer multiplication.

    • 

      NOTICE:

      1. is division over .

      2. is binary AND operation.

    • About function :
      As I said before, it converts a polynomial over to a integer. If I use a 17-elements-long list represent a polynomial over , whose every element represents a polynomial over , function can be defined as the following Python code:

      def T(x : list):
          ret = 0
          for i in range(0, 17):
              ret += x[i] * 2 ** (15 * i)
          
          return ret

  2.2. The Generation of "rarreg.key"

  • rarreg.key consists of a header, user's name, license type, UID, registration data and checksum.

    2.2.1 Header

    • It is just a text line:

      RAR registration data

    • Actually, when WinRAR verifies user's license file, it does not care what content the header have.

    2.2.2 User's name

    • It is also just a text line. Here I give a case:

      Phantom

    2.2.3 License type

    • Also just a text line. Actually it can be any text. Here I give a case:

      Single PC usage License

    2.2.5 UID

    • It is just a join of two parts of registration data. Here I give a case:

      UID=294d3fd81ae79b20c48c

    • Actually, when WinRAR verifies user's license file, it does not case UID at all.

    2.2.5 Registration data

    • Registration data has four parts. We name them RegData0, RegData1, RegData2, RegData3 respectively.

    • If ECC signature of license type is and (, which means in_data = license type, in_private = null) , convert their value to hex string str_R, str_S. The max possible length of str_R and str_S is 60 because and are both 30 bytes long. So RegData1 is the format output of "60", str_S and str_R:

      _stprintf_s(RegData[1], TEXT("60%060s%060s"), str_S, str_R);

      In the case I give, it should be:

      char RegData[1] = "60cc0b2d34fdb287124c6ca6b4f3239d36aa3ef82a9aba3a22d45552465c93260c3f609e601c26f312c4f44e7f8773a98b078809297303f8cac4a5ff92";

    • Let str_Kpub be the hex string of that is generated by user's name (in_private = user's name). RegData3 is:

      _stprintf_s(RegData[3], TEXT("%zd%.48s"), strlen(str_Kpub) - 4, str_Kpub);

      In the case I give, it should be:

      char RegData[3] = "6067c38462f2ff189c4b04e3c0540548d096e1068d9235023c";

    • Let str_Kpub2 be the hex string of that is generated by RegData3 (in_private = RegData3). So:

      _stprintf_s(RegData[0], TEXT("%s"), str_Kpub2);

      In the case I give, it should be:

      char RegData[0] = "c48c1c168f2ddf266ab3c33118678236ddeb1319b06790c929a038e487c79c60";

    • UID is:

      _stprintf_s(UID, TEXT("UID=%.16s%.4s"), str_Kpub + 48, str_Kpub2);

      In the case I give, it should be:

      char UID = "UID=294d3fd81ae79b20c48c";

      which is the same as what said before.

    • If ECC signature of str_UserName_RegData0 that is the join of user's name and RegData0 is and (, which means in_data = user's name + RegData0, in_private = null) , convert their value to hex string str_R2, str_S2. So RegData2 is the format output of "60", str_S2 and str_R2:

      _stprintf_s(RegData[2], TEXT("60%060s%060s"), str_S2, str_R2);

      In the case I give, it should be:

      char RegData[2] = "60625690ab228461b54ab9a4c0a4cc5f7fdf47aa192f839596b1628abf1bec0f405163f46ce6a778adc398cefae18dbb0e4f46291e4d61e573ae0eaeb9";

    2.2.5 Registration data

    • TODO

  ---

  • The output:

      _tprintf_s(TEXT("RAR registration data\n%s\n%s\n%s\n"), 
             UserName,
             LicenseType,
             UID);
      
      char temp[1024] = { };
      _stprintf_s(temp, TEXT("%zd%zd%zd%zd%s%s%s%s%lu"),
              strlen(RegisterData[0]),
              strlen(RegisterData[1]),
              strlen(RegisterData[2]),
              strlen(RegisterData[3]),
              RegisterData[0],
              RegisterData[1],
              RegisterData[2],
              RegisterData[3], 
              checksum);
    
      for (int i = 0; i < 8; ++i)
          _tprintf_s(TEXT("%.54s\n"), temp + i * 54);

    is rarreg.key.

3. How to build keygen?

• Please make sure that you have Visual Studio 2015 or the higher. Because this is a VS2015 project.

• You can open the project by VS2015 IDE and then build it with one click. Or use VS Developer Command Prompt:

  msbuild winrar-keygen.vcxproj /p:Configuration=Release;Platform=<x86|x64>;OutputPath=<your_output_dir> /t:build

• NOTICE: Do not use "Debug" configuration. Otherwise you may approximately wait for half a minute every time you generate a license file.

4. Example

D:\Github\winrar-keygen>msbuild winrar-keygen.vcxproj /p:Configuration=Release;Platform=x64;OutDir=D:\winrar-keygen\ /t:build
    ......
    ......

D:\Github\winrar-keygen>cd D:\winrar-keygen

D:\winrar-keygen>winrar-keygen.exe "Phantom" "Single PC License" >> rarreg.key