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using System;
using System.IO;
using System.Numerics;
using System.Security.Cryptography;
using System.Text;
namespace ipn_sqlclr
{
enum SerialNumberChunks : byte
{
Version = 0x01, // 1 byte of data - version
UserName = 0x02, // 1 + N bytes - length + N bytes of customer's name (without enging \0).
Email = 0x03, // 1 + N bytes - length + N bytes of customer's email (without ending \0).
ProductCode = 0x07, // 8 bytes - used for decrypting some parts of exe-file
UserData = 0x08, // 1 + N bytes - length + N bytes of user data
MaxBuild = 0x09, // 4 bytes - (year << 16) + (month << 8) + (day)
End = 0xFF // 4 bytes - checksum: the first four bytes of sha-1 hash from the data before that chunk
};
public static class Rsa
{
private const string PublicExpB64 = "AAEAAQ==";
private const string PrivateExpB64 = "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";
private const string ModulusB64 = "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";
static BigInteger B2Bi(byte[] b) //reverse & make positive
{
Array.Reverse(b);
var b2 = new byte[b.Length + 1];
Array.Copy(b, b2, b.Length);
return new BigInteger(b2);
}
private static readonly BigInteger PublicExp = B2Bi(Convert.FromBase64String(PublicExpB64));
private static readonly BigInteger PrivateExp = B2Bi(Convert.FromBase64String(PrivateExpB64));
private static readonly BigInteger Modulus = B2Bi(Convert.FromBase64String(ModulusB64));
public static byte[] Encrypt(byte[] paddedData)
{
var x = B2Bi(paddedData);
var y = BigInteger.ModPow(x, PrivateExp, Modulus);
byte[] ret = y.ToByteArray();
Array.Resize(ref ret, paddedData.Length);
Array.Reverse(ret);
return ret;
}
public static byte[] Decrypt(byte[] data)
{
var x = B2Bi(data);
var y = BigInteger.ModPow(x, PublicExp, Modulus);
byte[] ret = y.ToByteArray();
Array.Reverse(ret);
return ret;
}
}
public static class Keygen
{
public static void ParseKey(string key, out int productId, out string customerName, out string eMail, out DateTime maxBuildDt)
{
productId = -1;
customerName = null;
eMail = null;
maxBuildDt = new DateTime();
var crypted = Convert.FromBase64String(key);
var data = Rsa.Decrypt(crypted);
int i;
for (i = 2; i < data.Length && data[i] != 0; i++) {
}
i++;
var pos = i;
while (pos < data.Length)
{
var b = data[pos++];
switch (b)
{
case (byte) SerialNumberChunks.Version:
b = data[pos++];
if (b < 1 || b > 2)
throw new InvalidDataException("SerialNumberChunks.Version");
break;
case (byte) SerialNumberChunks.UserName:
b = data[pos++];
customerName = Encoding.UTF8.GetString(data, pos, b);
pos += b;
break;
case (byte) SerialNumberChunks.Email:
b = data[pos++];
eMail = Encoding.UTF8.GetString(data, pos, b);
pos += b;
break;
case (byte)SerialNumberChunks.ProductCode:
pos += 8;
break;
case (byte) SerialNumberChunks.UserData:
b = data[pos++];
if (b == 0)
productId = 0;
else if(b != 1)
throw new InvalidDataException("Invalid ProductID");
else
productId = data[pos];
pos += b;
break;
case (byte) SerialNumberChunks.MaxBuild:
maxBuildDt = new DateTime(data[pos + 2] + 256 * data[pos + 3], data[pos + 1],data[pos]);
pos += 4;
break;
case (byte) SerialNumberChunks.End:
if (pos + 4 > data.Length)
throw new InvalidDataException("No checksum");
{
SHA1 sha = new SHA1Managed();
sha.Initialize();
var hash = sha.ComputeHash(data, i, pos - 1 - i);
for (int j = 0; j < 4; j++)
{
if(data[pos + j] == hash[3 - j])
continue;
throw new InvalidDataException("Invalid checksum");
}
}
return;
}
}
throw new InvalidDataException("No checksum");
}
public static string GenerateKey(int productId, string customerName, string eMail, DateTime maxBuildDt)
{
var data = new MemoryStream();
data.WriteByte((byte)SerialNumberChunks.Version);
data.WriteByte(1);
data.WriteByte((byte)SerialNumberChunks.UserName);
var utfCustomer = Encoding.UTF8.GetBytes(customerName);
if (utfCustomer.Length > 255)
throw new ArgumentException("Customer name too long", "customerName");
data.WriteByte((byte)utfCustomer.Length);
data.Write(utfCustomer, 0, utfCustomer.Length);
data.WriteByte((byte)SerialNumberChunks.Email);
byte[] utfeMail = Encoding.UTF8.GetBytes(eMail);
if (utfeMail.Length > 255)
throw new ArgumentException("EMail too long", "eMail");
data.WriteByte((byte)utfeMail.Length);
data.Write(utfeMail, 0, utfeMail.Length);
data.WriteByte((byte)SerialNumberChunks.ProductCode);
data.Write(new byte[] { 41, 65, 36, 150, 5, 175, 174, 137 }, 0, 8);
data.WriteByte((byte)SerialNumberChunks.UserData);
data.WriteByte(1);
data.WriteByte((byte)productId);
data.WriteByte((byte)SerialNumberChunks.MaxBuild);
data.WriteByte((byte)maxBuildDt.Day);
data.WriteByte((byte)maxBuildDt.Month);
data.WriteByte((byte)maxBuildDt.Year);
data.WriteByte((byte)(maxBuildDt.Year >> 8));
SHA1 sha = new SHA1Managed();
sha.Initialize();
data.Position = 0;
var hash = sha.ComputeHash(data);
data.WriteByte((byte)SerialNumberChunks.End);
data.WriteByte(hash[3]);
data.WriteByte(hash[2]);
data.WriteByte(hash[1]);
data.WriteByte(hash[0]);
const int minPadding = 8 + 3;
const int maxPadding = minPadding + 16;
const int maxBytes = 3072 / 8;
if (data.Length + minPadding > maxBytes)
throw new ApplicationException("Serial number too long");
var rnd = new Random();
var paddingBytes = rnd.Next(minPadding, maxPadding + 1);
if (data.Length + paddingBytes > maxBytes)
paddingBytes = maxBytes - (int)data.Length;
var paddedData = new byte[maxBytes];
var nonPaddedData = data.ToArray();
Array.Copy(nonPaddedData, paddedData, paddingBytes);
Array.Copy(nonPaddedData, 0, paddedData, paddingBytes, data.Length);
paddedData[0] = 0;
paddedData[1] = 2;
paddedData[paddingBytes - 1] = 0;
var i = 2;
for (; i < paddingBytes - 1; i++) {
byte b = 0;
while (b == 0) {
b = (byte)rnd.Next(256);
}
paddedData[i] = b;
}
i = nonPaddedData.Length + paddingBytes;
while (i < maxBytes) {
paddedData[i++] = (byte)rnd.Next(256);
}
var res = Convert.ToBase64String(Rsa.Encrypt(paddedData), Base64FormattingOptions.InsertLineBreaks);
return res;
}
}
}
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