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Port (raw) password decryption code to C#.

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This commit is contained in:
Ray Koopa 2019-01-01 22:03:36 +01:00
parent 24b545f8e2
commit 35946c8e84
1 changed files with 99 additions and 8 deletions
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107
src/Syroot.Worms/OnlineWorms/LaunchConfig.cs
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@ -18,6 +18,7 @@ namespace Syroot.Worms.OnlineWorms
private static readonly char[] _invalidUserNameChars = { '=', '&', ' ' };
private string _userName;
private string _passwordString;
// ---- CONSTRUCTORS & DESTRUCTOR ------------------------------------------------------------------------------
@ -51,11 +52,6 @@ namespace Syroot.Worms.OnlineWorms
}
}
/// <summary>
/// Gets or sets the initially entered password. This value is encrypted before being stored in the config.
/// </summary>
public string Password { get; set; }
// ---- METHODS (PUBLIC) ---------------------------------------------------------------------------------------
/// <summary>
@ -72,9 +68,11 @@ namespace Syroot.Worms.OnlineWorms
{
stream.Write("Online Worms Config File");
stream.Position = 36;
// TODO: Encrypt password and pass appropriate key as ";encryptedData;key".
stream.Write(";Unknown;0");
if (_passwordString != null)
{
stream.Position = 36;
stream.Write(_passwordString);
}
stream.Position = 66;
stream.Write("UID=", StringCoding.Raw);
@ -87,5 +85,98 @@ namespace Syroot.Worms.OnlineWorms
}
return mappedFile;
}
/// <summary>
/// Removes any previously set password in the configuration.
/// </summary>
public void ClearPassword()
{
_passwordString = null;
}
/// <summary>
/// Decrypts the password stored in the configuration as previously set through
/// <see cref="SetPassword(String, Int32)"/>.
/// </summary>
public string GetPassword()
{
// TODO: Decrypt password:
return _passwordString;
}
/// <summary>
/// Encrypts the given <paramref name="password"/> with the provided initial encryption <paramref name="key"/>
/// and stores the result in the launch config.
/// </summary>
/// <param name="password">The password to store encrypted.</param>
/// <param name="key">The key to encrypt with.</param>
public void SetPassword(string password, int key)
{
// TODO: Encrypt password.
_passwordString = $";{password};{key}";
}
// ---- METHODS (PRIVATE) --------------------------------------------------------------------------------------
public string DecryptPassword(string data, int key)
{
byte[] decodeBuffer = new byte[64];
int decodeIdx = 0;
int idx = 0;
do
{
int subIdx = 0;
uint curValue = 0;
string dataRemain = data.Substring(idx);
do
{
uint baseValue = 1;
if (subIdx > 0)
{
int subIdxCounter = subIdx;
do
{
baseValue *= 36;
subIdxCounter--;
} while (subIdxCounter != 0);
}
char c = dataRemain[subIdx];
uint factor = (uint)(c < '0' || c > '9' ? c - '7' : c - '0');
curValue += baseValue * factor;
++subIdx;
} while (subIdx < 7);
idx += 7;
int value = DecryptValue(curValue, 0) - key;
Buffer.BlockCopy(BitConverter.GetBytes(value), 0, decodeBuffer, decodeIdx++, sizeof(int));
} while (idx < data.Length);
return Encoding.ASCII.GetString(decodeBuffer);
}
public int DecryptValue(uint value, int shiftArrayIndex)
{
int[][] shifts = new int[][]
{
new[] { 18, 29, 7, 25, 15, 31, 22, 27, 9, 26, 3, 13, 19, 14, 20, 11, 5, 2, 23, 16, 10, 24, 28, 17, 6, 30, 0, 21, 12, 8, 4, 1 },
new[] { 26, 31, 17, 10, 30, 16, 24, 2, 29, 8, 20, 15, 28, 11, 13, 4, 19, 23, 0, 12, 14, 27, 6, 18, 21, 3, 9, 22, 7, 1, 25, 5 }
};
int result = 0;
if (value != 0)
{
int idx = 0;
do
{
uint highBits = (uint)(value - (value & ~1));
value >>= 1; // / 2
if (highBits != 0)
{
int shift = shifts[shiftArrayIndex][idx];
result += (int)(highBits << shift);
}
idx++;
} while (value != 0);
}
return result;
}
}
}