/*
 * Copyright (C) 2012-2017 CypherCore <http://github.com/CypherCore>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

using System;
using System.Numerics;

namespace Framework.Cryptography
{
    public class RsaCrypt : IDisposable
    {
        public RsaCrypt()
        {
            Dispose();
        }

        public void InitializeEncryption<T>(T p, T q, T dp, T dq, T iq, bool isBigEndian = false)
        {
            this._p = p.ToBigInteger(isBigEndian);
            this._q = q.ToBigInteger(isBigEndian);
            this._dp = dp.ToBigInteger(isBigEndian);
            this._dq = dq.ToBigInteger(isBigEndian);
            this._iq = iq.ToBigInteger(isBigEndian);

            if (this._p.IsZero && this._q.IsZero)
                throw new InvalidOperationException("'0' isn't allowed for p or q");
            else
                _isEncryptionInitialized = true;
        }

        public void InitializeDecryption<T>(T e, T n, bool reverseBytes = false)
        {
            this._e = e.ToBigInteger(reverseBytes);
            this._n = n.ToBigInteger(reverseBytes);

            _isDecryptionInitialized = true;
        }

        public byte[] Encrypt<T>(T data, bool isBigEndian = false)
        {
            if (!_isEncryptionInitialized)
                throw new InvalidOperationException("Encryption not initialized");

            var bData = data.ToBigInteger(isBigEndian);

            var m1 = BigInteger.ModPow(bData % _p, _dp, _p);
            var m2 = BigInteger.ModPow(bData % _q, _dq, _q);

            var h = (_iq * (m1 - m2)) % _p;

            // Be sure to use the positive remainder
            if (h.Sign == -1)
                h = _p + h;

            var m = m2 + h * _q;

            return m.ToByteArray();
        }

        public byte[] Decrypt<T>(T data, bool isBigEndian = false)
        {
            if (!_isDecryptionInitialized)
                throw new InvalidOperationException("Encryption not initialized");

            var c = data.ToBigInteger(isBigEndian);

            return BigInteger.ModPow(c, _e, _n).ToByteArray();
        }

        public void Dispose()
        {
            this._e = 0;
            this._n = 0;
            this._p = 0;
            this._q = 0;
            this._dp = 0;
            this._dq = 0;
            this._iq = 0;

            _isEncryptionInitialized = false;
            _isDecryptionInitialized = false;
        }

        BigInteger _e;
        BigInteger _n;
        BigInteger _p;
        BigInteger _q;
        BigInteger _dp;
        BigInteger _dq;
        BigInteger _iq;
        bool _isEncryptionInitialized;
        bool _isDecryptionInitialized;
    }

    public class RsaStore
    {
        public static byte[] DP = { 0xE1, 0xA6, 0x22, 0xAB, 0xFF, 0x57, 0x83, 0x45, 0x3F, 0x93, 0x76, 0xC8, 0xFA, 0xD9, 0x17, 0xE1, 0x49, 0x73, 0xC2, 0x13, 0x28, 0x0B, 0x1F, 0xE2, 0x9A, 0xF4, 0x7F, 0x7C, 0x37, 0x56, 0xA1, 0xDF, 0x51, 0x97, 0x2F, 0x15, 0x10, 0x97, 0xCD, 0x2A, 0x40, 0x09, 0xFC, 0x0A, 0xC3, 0x3F, 0x88, 0x86, 0xA9, 0x51, 0x13, 0xE1, 0x76, 0xCF, 0xA8, 0x37, 0x9A, 0x91, 0x3B, 0xD0, 0x70, 0xA1, 0xD7, 0x03, 0x71, 0x59, 0x6C, 0xB3, 0x41, 0xB8, 0x32, 0x68, 0x56, 0xC8, 0xB8, 0xD1, 0xF9, 0x1D, 0x04, 0xC5, 0x13, 0xB5, 0x8E, 0x57, 0x73, 0x02, 0x97, 0x7B, 0x33, 0x60, 0x68, 0xA9, 0xC2, 0x40, 0x96, 0x3C, 0x57, 0x4E, 0x4F, 0xC0, 0xAB, 0x21, 0x5C, 0xBA, 0x7D, 0x65, 0xAA, 0x1B, 0xD6, 0x43, 0x06, 0xCE, 0x3E, 0x0C, 0xB9, 0xB2, 0x82, 0xB0, 0xC9, 0x54, 0x59, 0x32, 0xC5, 0x88, 0x08, 0x9C, 0x9B, 0xBF };
        public static byte[] DQ = { 0xE3, 0xB1, 0xED, 0x52, 0xEF, 0xE6, 0x88, 0x40, 0x50, 0x89, 0x4C, 0x99, 0xE5, 0xF7, 0xED, 0x03, 0x1C, 0x54, 0x11, 0x24, 0x2F, 0x9D, 0xE8, 0xE6, 0x39, 0xFA, 0x19, 0xF4, 0x06, 0x55, 0x0B, 0x8B, 0x95, 0xC8, 0xB1, 0xE2, 0x7C, 0x75, 0x3B, 0x2A, 0x40, 0xC3, 0xE7, 0xE0, 0x25, 0x18, 0xBF, 0xB5, 0x03, 0x1B, 0x5A, 0x57, 0x92, 0x3C, 0x85, 0x7D, 0x7F, 0x43, 0x56, 0x1F, 0x1E, 0x80, 0xC3, 0xBA, 0xF0, 0x53, 0xD7, 0x6A, 0xD0, 0xF2, 0xDD, 0x9C, 0xC6, 0x53, 0xE7, 0xB4, 0xD3, 0x9D, 0xAB, 0xBF, 0xE0, 0x97, 0x50, 0x92, 0x23, 0xB9, 0xB7, 0xDC, 0xAA, 0xC4, 0x20, 0x93, 0x5A, 0xF5, 0xDE, 0x76, 0x28, 0x93, 0x91, 0x44, 0x1E, 0x4C, 0x15, 0x2F, 0x7F, 0x45, 0x3C, 0x3B, 0x7D, 0x36, 0x3B, 0x24, 0xC7, 0x8C, 0x65, 0x43, 0xAE, 0x65, 0x84, 0xBC, 0xF9, 0x76, 0x4E, 0x3C, 0x44, 0x05, 0xBC, 0xFA };
        public static byte[] InverseQ = { 0x63, 0xC1, 0x14, 0x2B, 0x57, 0x0B, 0x8A, 0x3C, 0x27, 0xDB, 0x96, 0x82, 0x27, 0xEB, 0xF6, 0x45, 0x6D, 0x07, 0x50, 0xE8, 0x4A, 0xD4, 0xB6, 0x7A, 0x3C, 0x8B, 0x4D, 0x65, 0xF0, 0x50, 0x70, 0x84, 0x71, 0x2B, 0xC6, 0x6D, 0x28, 0x2D, 0x76, 0x38, 0x73, 0x93, 0xDB, 0x44, 0xD7, 0xC0, 0x7F, 0xD9, 0x57, 0x18, 0x28, 0x57, 0xF1, 0x13, 0x38, 0xA4, 0x91, 0x67, 0x1E, 0x13, 0x73, 0x55, 0xFC, 0x7B, 0xAF, 0x50, 0xFA, 0xFD, 0x16, 0x12, 0x6F, 0xA4, 0x95, 0x15, 0x9C, 0x07, 0x18, 0xA6, 0x46, 0xFD, 0xB3, 0xCF, 0xA5, 0x0E, 0x05, 0x30, 0xEC, 0x2C, 0xCD, 0x62, 0xDD, 0x6F, 0xB1, 0xFE, 0x6C, 0x05, 0x2F, 0x11, 0xA6, 0xA0, 0x98, 0xAC, 0x9B, 0x15, 0xF0, 0x04, 0xC4, 0x7B, 0x79, 0xAA, 0x51, 0x25, 0x2A, 0x84, 0x73, 0xE6, 0x77, 0x47, 0xA3, 0xEB, 0xCF, 0x6D, 0xC8, 0x96, 0x3A, 0x1B, 0x02, 0x52 };
        public static byte[] P = { 0x7D, 0xBD, 0xB9, 0xE1, 0x2D, 0xAE, 0x42, 0x56, 0x6E, 0x2B, 0xE2, 0x89, 0xD9, 0xBB, 0x0C, 0x1F, 0x67, 0x28, 0xC1, 0x4D, 0x91, 0x3C, 0xAD, 0x5F, 0xF0, 0x43, 0x86, 0x5C, 0x27, 0xDC, 0x58, 0xB3, 0x0E, 0x75, 0x77, 0x78, 0x49, 0x35, 0xE7, 0xE7, 0xDF, 0xFD, 0x74, 0xAB, 0x4E, 0xFE, 0xD3, 0xAB, 0x6B, 0x96, 0xF7, 0x89, 0xB2, 0x5A, 0x6A, 0x25, 0x03, 0x5A, 0x92, 0x1A, 0xF1, 0xFC, 0x05, 0x4E, 0xCE, 0xDD, 0x37, 0xA4, 0x02, 0x53, 0x76, 0xCB, 0xC2, 0xD9, 0x63, 0xCB, 0x51, 0x94, 0xEC, 0x5C, 0x39, 0xCC, 0xB2, 0x17, 0x0C, 0xA3, 0x43, 0x9A, 0xD0, 0x83, 0x27, 0x67, 0x52, 0x64, 0x37, 0x0E, 0x38, 0xB7, 0x9B, 0xF4, 0x2D, 0xB8, 0x0F, 0x30, 0x72, 0xD3, 0x15, 0xF3, 0x2C, 0x39, 0x55, 0x72, 0x2C, 0x55, 0x80, 0x63, 0xA0, 0xA1, 0x6F, 0x28, 0xF3, 0xF3, 0x5A, 0x6F, 0x68, 0x59, 0xB3, 0xF3 };
        public static byte[] Q = { 0x0B, 0x1A, 0x13, 0x07, 0x12, 0xEF, 0xDD, 0x97, 0x01, 0x9A, 0x21, 0x7D, 0xFA, 0xA3, 0xB7, 0xE2, 0x39, 0x2E, 0x04, 0x92, 0x96, 0x45, 0x2A, 0xEB, 0x57, 0x03, 0xAC, 0xB1, 0x83, 0xCD, 0x25, 0x4F, 0x2C, 0xA9, 0xA1, 0x54, 0x26, 0x54, 0xCF, 0xE6, 0x1B, 0x53, 0x51, 0x3A, 0xC1, 0x15, 0xF4, 0x17, 0xBB, 0x17, 0x1F, 0x37, 0x66, 0x36, 0x1A, 0xD4, 0xB1, 0x5B, 0x49, 0xA8, 0xF1, 0x02, 0xB0, 0x42, 0xA9, 0x66, 0xA0, 0xE2, 0x52, 0x2C, 0x8C, 0x89, 0xA2, 0xDD, 0xA6, 0xF1, 0xA3, 0xDF, 0xB6, 0x80, 0x63, 0xB8, 0x10, 0xDA, 0xDE, 0x84, 0x56, 0xFA, 0xFB, 0x72, 0x65, 0x5E, 0xA3, 0x9C, 0x78, 0x65, 0xD0, 0x73, 0x07, 0x34, 0x1D, 0xE1, 0x4D, 0x77, 0xE8, 0x00, 0x0F, 0x80, 0x1C, 0x5A, 0x21, 0x55, 0x0A, 0x8C, 0xF4, 0x93, 0xF5, 0xF8, 0x40, 0xF2, 0x40, 0xEA, 0x52, 0x12, 0x40, 0xF0, 0xBF, 0xFA };
        public static byte[] WherePacketHmac = { 0x2C, 0x1F, 0x1D, 0x80, 0xC3, 0x8C, 0x23, 0x64, 0xDA, 0x90, 0xCA, 0x8E, 0x2C, 0xFC, 0x0C, 0xCE, 0x09, 0xD3, 0x62, 0xF9, 0xF3, 0x8B, 0xBE, 0x9F, 0x19, 0xEF, 0x58, 0xA1, 0x1C, 0x34, 0x14, 0x41, 0x3F, 0x23, 0xFD, 0xD3, 0xE8, 0x14, 0xEC, 0x2A, 0xFD, 0x4F, 0x95, 0xBA, 0x30, 0x7E, 0x56, 0x5D, 0x83, 0x95, 0x81, 0x69, 0xB0, 0x5A, 0xB4, 0x9D, 0xA8, 0x55, 0xFF, 0xFC, 0xEE, 0x58, 0x0A, 0x2F };
    }
}
