const Helpers = require("../utils/Helpers");
const BigIntBuffer = require("bigint-buffer");


class RSAServerKey {
    constructor(fingerprint, m, e) {
        this.fingerprint = fingerprint;
        this.m = m;
        this.e = e;

    }

    /**
     * Encrypts the given data with the current key
     * @param data
     * @param offset
     * @param length
     */
    encrypt(data, offset, length) {
        if (offset === undefined) {
            offset = 0;
        }
        if (length === undefined) {
            length = data.length;
        }

        let dataToWrite = data.slice(offset, offset + length);
        let sha1Data = Helpers.sha1(dataToWrite);
        let writer = Buffer.concat([sha1Data, dataToWrite]);
        let rnd = Helpers.generateRandomBytes(235 - length);

        if (length < 235) {
            writer = Buffer.concat([writer, rnd]);

        }

        let result = BigIntBuffer.toBigIntBE(writer);

        result = Helpers.modExp(result, this.e, this.m);

        /**
         *  If the result byte count is less than 256, since the byte order is big,
         *  the non-used bytes on the left will be 0 and act as padding,
         *  without need of any additional checks
         */
        result = BigInt(result);
        return BigIntBuffer.toBufferBE(result, 256);
    }
}


class RSA {
    static _server_keys = {
        '216be86c022bb4c3': new RSAServerKey("216be86c022bb4c3", BigInt('0xC150023E2F70DB7985DED064759CFECF0AF328E69A41DAF4D6F01B538135A6F9' +
            '1F8F8B2A0EC9BA9720CE352EFCF6C5680FFC424BD634864902DE0B4BD6D49F4E' +
            '580230E3AE97D95C8B19442B3C0A10D8F5633FECEDD6926A7F6DAB0DDB7D457F' +
            '9EA81B8465FCD6FFFEED114011DF91C059CAEDAF97625F6C96ECC74725556934' +
            'EF781D866B34F011FCE4D835A090196E9A5F0E4449AF7EB697DDB9076494CA5F' +
            '81104A305B6DD27665722C46B60E5DF680FB16B210607EF217652E60236C255F' +
            '6A28315F4083A96791D7214BF64C1DF4FD0DB1944FB26A2A57031B32EEE64AD1' +
            '5A8BA68885CDE74A5BFC920F6ABF59BA5C75506373E7130F9042DA922179251F'), BigInt('0x010001')),
// -4344800451088585951
        '-4344800451088585951': new RSAServerKey(  // Telegram servers //1
// -----BEGIN RSA PUBLIC KEY-----
            // MIIBCgKCAQEAwVACPi9w23mF3tBkdZz+zwrzKOaaQdr01vAbU4E1pvkfj4sqDsm6
            // lyDONS789sVoD/xCS9Y0hkkC3gtL1tSfTlgCMOOul9lcixlEKzwKENj1Yz/s7daS
            // an9tqw3bfUV/nqgbhGX81v/+7RFAEd+RwFnK7a+XYl9sluzHRyVVaTTveB2GazTw
            // Efzk2DWgkBluml8OREmvfraX3bkHZJTKX4EQSjBbbdJ2ZXIsRrYOXfaA+xayEGB+
            // 8hdlLmAjbCVfaigxX0CDqWeR1yFL9kwd9P0NsZRPsmoqVwMbMu7mStFai6aIhc3n
            // Slv8kg9qv1m6XHVQY3PnEw+QQtqSIXklHwIDAQAB
// -----END RSA PUBLIC KEY-----
            "-4344800451088585951",
            parseInt(
                "C150023E2F70DB7985DED064759CFECF0AF328E69A41DAF4D6F01B538135A6F9" +
                "1F8F8B2A0EC9BA9720CE352EFCF6C5680FFC424BD634864902DE0B4BD6D49F4E" +
                "580230E3AE97D95C8B19442B3C0A10D8F5633FECEDD6926A7F6DAB0DDB7D457F" +
                "9EA81B8465FCD6FFFEED114011DF91C059CAEDAF97625F6C96ECC74725556934" +
                "EF781D866B34F011FCE4D835A090196E9A5F0E4449AF7EB697DDB9076494CA5F" +
                "81104A305B6DD27665722C46B60E5DF680FB16B210607EF217652E60236C255F" +
                "6A28315F4083A96791D7214BF64C1DF4FD0DB1944FB26A2A57031B32EEE64AD1" +
                "5A8BA68885CDE74A5BFC920F6ABF59BA5C75506373E7130F9042DA922179251F", +
                    16
            ),  // Modulus
            parseInt("010001", 16)  // Exponent
        ),

        // 847625836280919973
        '847625836280919973': new RSAServerKey(  // Telegram servers //2
// -----BEGIN PUBLIC KEY-----
            // MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAruw2yP/BCcsJliRoW5eB
            // VBVle9dtjJw+OYED160Wybum9SXtBBLXriwt4rROd9csv0t0OHCaTmRqBcQ0J8fx
            // hN6/cpR1GWgOZRUAiQxoMnlt0R93LCX/j1dnVa/gVbCjdSxpbrfY2g2L4frzjJvd
            // l84Kd9ORYjDEAyFnEA7dD556OptgLQQ2e2iVNq8NZLYTzLp5YpOdO1doK+ttrltg
            // gTCy5SrKeLoCPPbOgGsdxJxyz5KKcZnSLj16yE5HvJQn0CNpRdENvRUXe6tBP78O
            // 39oJ8BTHp9oIjd6XWXAsp2CvK45Ol8wFXGF710w9lwCGNbmNxNYhtIkdqfsEcwR5
            // JwIDAQAB
// -----END PUBLIC KEY-----
            '847625836280919973',
            parseInt(
                "AEEC36C8FFC109CB099624685B97815415657BD76D8C9C3E398103D7AD16C9BB" +
                "A6F525ED0412D7AE2C2DE2B44E77D72CBF4B7438709A4E646A05C43427C7F184" +
                "DEBF72947519680E651500890C6832796DD11F772C25FF8F576755AFE055B0A3" +
                "752C696EB7D8DA0D8BE1FAF38C9BDD97CE0A77D3916230C4032167100EDD0F9E" +
                "7A3A9B602D04367B689536AF0D64B613CCBA7962939D3B57682BEB6DAE5B6081" +
                "30B2E52ACA78BA023CF6CE806B1DC49C72CF928A7199D22E3D7AC84E47BC9427" +
                "D0236945D10DBD15177BAB413FBF0EDFDA09F014C7A7DA088DDE9759702CA760" +
                "AF2B8E4E97CC055C617BD74C3D97008635B98DC4D621B4891DA9FB0473047927",
                16
            ),  // Modulus
            parseInt("010001", 16)  // Exponent
        ),

        // 1562291298945373506
        '1562291298945373506': new RSAServerKey(  // Telegram servers //3
// -----BEGIN PUBLIC KEY-----
            // MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvfLHfYH2r9R70w8prHbl
            // Wt/nDkh+XkgpflqQVcnAfSuTtO05lNPspQmL8Y2XjVT4t8cT6xAkdgfmmvnvRPOO
            // KPi0OfJXoRVylFzAQG/j83u5K3kRLbae7fLccVhKZhY46lvsueI1hQdLgNV9n1cQ
            // 3TDS2pQOCtovG4eDl9wacrXOJTG2990VjgnIKNA0UMoP+KF03qzryqIt3oTvZq03
            // DyWdGK+AZjgBLaDKSnC6qD2cFY81UryRWOab8zKkWAnhw2kFpcqhI0jdV5QaSCEx
            // vnsjVaX0Y1N0870931/5Jb9ICe4nweZ9kSDF/gip3kWLG0o8XQpChDfyvsqB9OLV
// /wIDAQAB
// -----END PUBLIC KEY-----
            '1562291298945373506',
            parseInt(
                "BDF2C77D81F6AFD47BD30F29AC76E55ADFE70E487E5E48297E5A9055C9C07D2B" +
                "93B4ED3994D3ECA5098BF18D978D54F8B7C713EB10247607E69AF9EF44F38E28" +
                "F8B439F257A11572945CC0406FE3F37BB92B79112DB69EEDF2DC71584A661638" +
                "EA5BECB9E23585074B80D57D9F5710DD30D2DA940E0ADA2F1B878397DC1A72B5" +
                "CE2531B6F7DD158E09C828D03450CA0FF8A174DEACEBCAA22DDE84EF66AD370F" +
                "259D18AF806638012DA0CA4A70BAA83D9C158F3552BC9158E69BF332A45809E1" +
                "C36905A5CAA12348DD57941A482131BE7B2355A5F4635374F3BD3DDF5FF925BF" +
                "4809EE27C1E67D9120C5FE08A9DE458B1B4A3C5D0A428437F2BECA81F4E2D5FF",
                16
            ),  // Modulus
            parseInt("010001", 16)  // Exponent
        ),

// -5859577972006586033
        '-5859577972006586033': new RSAServerKey(  // Telegram servers //4
// -----BEGIN PUBLIC KEY-----
            // MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs/ditzm+mPND6xkhzwFI
            // z6J/968CtkcSE/7Z2qAJiXbmZ3UDJPGrzqTDHkO30R8VeRM/Kz2f4nR05GIFiITl
            // 4bEjvpy7xqRDspJcCFIOcyXm8abVDhF+th6knSU0yLtNKuQVP6voMrnt9MV1X92L
            // GZQLgdHZbPQz0Z5qIpaKhdyA8DEvWWvSUwwc+yi1/gGaybwlzZwqXYoPOhwMebzK
            // Uk0xW14htcJrRrq+PXXQbRzTMynseCoPIoke0dtCodbA3qQxQovE16q9zz4Otv2k
            // 4j63cz53J+mhkVWAeWxVGI0lltJmWtEYK6er8VqqWot3nqmWMXogrgRLggv/Nbbo
            // oQIDAQAB
// -----END PUBLIC KEY-----
            '-5859577972006586033',
            parseInt(
                "B3F762B739BE98F343EB1921CF0148CFA27FF7AF02B6471213FED9DAA0098976" +
                "E667750324F1ABCEA4C31E43B7D11F1579133F2B3D9FE27474E462058884E5E1" +
                "B123BE9CBBC6A443B2925C08520E7325E6F1A6D50E117EB61EA49D2534C8BB4D" +
                "2AE4153FABE832B9EDF4C5755FDD8B19940B81D1D96CF433D19E6A22968A85DC" +
                "80F0312F596BD2530C1CFB28B5FE019AC9BC25CD9C2A5D8A0F3A1C0C79BCCA52" +
                "4D315B5E21B5C26B46BABE3D75D06D1CD33329EC782A0F22891ED1DB42A1D6C0" +
                "DEA431428BC4D7AABDCF3E0EB6FDA4E23EB7733E7727E9A1915580796C55188D" +
                "2596D2665AD1182BA7ABF15AAA5A8B779EA996317A20AE044B820BFF35B6E8A1",
                16
            ),  // Modulus
            parseInt("010001", 16)  // Exponent
        ),

        // 6491968696586960280
        '6491968696586960280': new RSAServerKey(  // Telegram servers //5
// -----BEGIN PUBLIC KEY-----
            // MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvmpxVY7ld/8DAjz6F6q0
            // 5shjg8/4p6047bn6/m8yPy1RBsvIyvuDuGnP/RzPEhzXQ9UJ5Ynmh2XJZgHoE9xb
            // nfxL5BXHplJhMtADXKM9bWB11PU1Eioc3+AXBB8QiNFBn2XI5UkO5hPhbb9mJpjA
            // 9Uhw8EdfqJP8QetVsI/xrCEbwEXe0xvifRLJbY08/Gp66KpQvy7g8w7VB8wlgePe
            // xW3pT13Ap6vuC+mQuJPyiHvSxjEKHgqePji9NP3tJUFQjcECqcm0yV7/2d0t/pbC
            // m+ZH1sadZspQCEPPrtbkQBlvHb4OLiIWPGHKSMeRFvp3IWcmdJqXahxLCUS1Eh6M
            // AQIDAQAB
// -----END PUBLIC KEY-----
            '6491968696586960280',
            parseInt(
                "BE6A71558EE577FF03023CFA17AAB4E6C86383CFF8A7AD38EDB9FAFE6F323F2D" +
                "5106CBC8CAFB83B869CFFD1CCF121CD743D509E589E68765C96601E813DC5B9D" +
                "FC4BE415C7A6526132D0035CA33D6D6075D4F535122A1CDFE017041F1088D141" +
                "9F65C8E5490EE613E16DBF662698C0F54870F0475FA893FC41EB55B08FF1AC21" +
                "1BC045DED31BE27D12C96D8D3CFC6A7AE8AA50BF2EE0F30ED507CC2581E3DEC5" +
                "6DE94F5DC0A7ABEE0BE990B893F2887BD2C6310A1E0A9E3E38BD34FDED254150" +
                "8DC102A9C9B4C95EFFD9DD2DFE96C29BE647D6C69D66CA500843CFAED6E44019" +
                "6F1DBE0E2E22163C61CA48C79116FA77216726749A976A1C4B0944B5121E8C01",
                16
            ),  // Modulus
            parseInt("010001", 16)  // Exponent
        ),

        // 6427105915145367799
        '6427105915145367799': new RSAServerKey(  // CDN DC-121
// -----BEGIN RSA PUBLIC KEY-----
            // MIIBCgKCAQEA+Lf3PvgE1yxbJUCMaEAkV0QySTVpnaDjiednB5RbtNWjCeqSVakY
            // HbqqGMIIv5WCGdFdrqOfMNcNSstPtSU6R9UmRw6tquOIykpSuUOje9H+4XVIKquj
            // yL2ISdK+4ZOMl4hCMkqauw4bP1Sbr03vZRQbU6qEA04V4j879BAyBVhr3WG9+Zi+
            // t5XfGSTgSExPYEl8rZNHYNV5RB+BuroVH2HLTOpT/mJVfikYpgjfWF5ldezV4Wo9
            // LSH0cZGSFIaeJl8d0A8Eiy5B9gtBO8mL+XfQRKOOmr7a4BM4Ro2de5rr2i2od7hY
            // Xd3DO9FRSl4y1zA8Am48Rfd95WHF3N/OmQIDAQAB
// -----END RSA PUBLIC KEY-----
            '6427105915145367799',
            parseInt(
                "F8B7F73EF804D72C5B25408C6840245744324935699DA0E389E76707945BB4D5" +
                "A309EA9255A9181DBAAA18C208BF958219D15DAEA39F30D70D4ACB4FB5253A47" +
                "D526470EADAAE388CA4A52B943A37BD1FEE175482AABA3C8BD8849D2BEE1938C" +
                "978842324A9ABB0E1B3F549BAF4DEF65141B53AA84034E15E23F3BF410320558" +
                "6BDD61BDF998BEB795DF1924E0484C4F60497CAD934760D579441F81BABA151F" +
                "61CB4CEA53FE62557E2918A608DF585E6575ECD5E16A3D2D21F471919214869E" +
                "265F1DD00F048B2E41F60B413BC98BF977D044A38E9ABEDAE01338468D9D7B9A" +
                "EBDA2DA877B8585DDDC33BD1514A5E32D7303C026E3C45F77DE561C5DCDFCE99",
                16
            ),  // Modulus
            parseInt("010001", 16)  // Exponent
        ),

        // 2685959930972952888
        '2685959930972952888': new RSAServerKey(  // CDN DC-140
// -----BEGIN RSA PUBLIC KEY-----
            // MIIBCgKCAQEAzuHVC7sE50Kho/yDVZtWnlmA5Bf/aM8KZY3WzS16w6w1sBqipj8o
            // gMGG7ULbGBtYmKEaI7IIJO6WM2m1MaXVnsqS8d7PaGAZiy8rSN3S7S2a8wp4RXZe
            // hs0JAXvZeIz45iByCMBfycbJKmSweYkesRUI7hUO8eQhmm/UYUEpJY7VOt0Iemiu
            // URSpqlRQ2FlcyHahYUNcvbICb4+/AP7coKBn6cB5FyzM7MCcKxbEKOx3Y3MUnbZq
            // q5pN6/eRazkegyrlp4kuJ94KsbRFHFX5Dx8uzjrO9wi8LF7gIgZu5DRMcmjXJKq6
            // rGZ2Z9cnrD8pVu1L2vcInd4K6ximZS2hbwIDAQAB
// -----END RSA PUBLIC KEY-----
            '2685959930972952888',
            parseInt(
                "CEE1D50BBB04E742A1A3FC83559B569E5980E417FF68CF0A658DD6CD2D7AC3AC" +
                "35B01AA2A63F2880C186ED42DB181B5898A11A23B20824EE963369B531A5D59E" +
                "CA92F1DECF6860198B2F2B48DDD2ED2D9AF30A7845765E86CD09017BD9788CF8" +
                "E6207208C05FC9C6C92A64B079891EB11508EE150EF1E4219A6FD4614129258E" +
                "D53ADD087A68AE5114A9AA5450D8595CC876A161435CBDB2026F8FBF00FEDCA0" +
                "A067E9C079172CCCECC09C2B16C428EC776373149DB66AAB9A4DEBF7916B391E" +
                "832AE5A7892E27DE0AB1B4451C55F90F1F2ECE3ACEF708BC2C5EE022066EE434" +
                "4C7268D724AABAAC667667D727AC3F2956ED4BDAF7089DDE0AEB18A6652DA16F",
                16
            ),  // Modulus
            parseInt("010001", 16)  // Exponent
        )

    };

    /**
     * Encrypts the given data given a fingerprint
     * @param fingerprint
     * @param data
     * @param offset
     * @param length
     */
    static encrypt(fingerprint, data, offset, length) {
        if (!(fingerprint.toLowerCase() in RSA._server_keys)) {
            return;
        }
        let key = RSA._server_keys[fingerprint.toLowerCase()];
        return key.encrypt(data, offset, length);

    }
}


module.exports = RSA;