/// <summary>
/// Calculates the double-pass "broken" SHA-1 hash of the
/// specified data. This method is not CLS-compliant.
/// </summary>
/// <param name="data">The data buffer to hash.</param>
/// <param name="clientToken">The client token,
/// a randomly-generated value specified by the client.</param>
/// <param name="serverToken">The server token, a
/// randomly-generated value specified by the server.</param>
/// <returns>A 20-byte buffer containing the hash value.</returns>
//[CLSCompliant(false)]
public static byte[] DoubleHashData(byte[] data,
uint clientToken, uint serverToken)
{
MemoryStream ms = new MemoryStream(28);
BinaryWriter bw = new BinaryWriter(ms);
byte[] firstHash = XSha1.CalculateHash(data);
bw.Write(clientToken);
bw.Write(serverToken);
bw.Write(firstHash);
byte[] toCalc = ms.GetBuffer();
return(XSha1.CalculateHash(toCalc));
}
// removed: unused
/*
* private static ushort SWAP2(uint num)
* {
* return (ushort)((((num) >> 8) & 0x00FF) | (((num) << 8) & 0xFF00));
* }
*/
#endregion
#region calculate hash
private void calculateHash(uint clientToken, uint serverToken)
{
if (!valid)
{
throw new InvalidOperationException("The CD key was invalid and the hash could not be calculated.");
}
MemoryStream ms = new MemoryStream(26);
BinaryWriter bw = new BinaryWriter(ms);
bw.Write(clientToken);
bw.Write(serverToken);
switch (key.Length)
{
case 13:
case 16:
bw.Write(product);
bw.Write(val1);
bw.Write((int)0);
bw.Write(val2);
bw.Write((short)0);
hash = XSha1.CalculateHash(ms.GetBuffer());
break;
case 26:
bw.Write(product);
bw.Write(val1);
bw.Write(val2);
byte[] buffer = ms.GetBuffer();
SHA1 sha = new SHA1Managed();
hash = sha.ComputeHash(buffer);
break;
default:
break;
}
ms.Close();
}
/// <summary>
/// Calculates the single "broken" SHA-1 hash of the specified
/// data.
/// </summary>
/// <param name="data">The data buffer to hash.</param>
/// <returns>A 20-byte buffer containing the hash value.</returns>
public static byte[] HashData(byte[] data)
{
return(XSha1.CalculateHash(data));
}