// SoftEther VPN Source Code - Developer Edition Master Branch
// Cedar Communication Module


// Database.c
// License database

#include "CedarPch.h"

// Get the License status string
wchar_t *LiGetLicenseStatusStr(UINT i)
{
	wchar_t *ret = _UU("LICENSE_STATUS_OTHERERROR");

	switch (i)
	{
	case LICENSE_STATUS_OK:
		ret = _UU("LICENSE_STATUS_OK");
		break;

	case LICENSE_STATUS_EXPIRED:
		ret = _UU("LICENSE_STATUS_EXPIRED");
		break;

	case LICENSE_STATUS_ID_DIFF:
		ret = _UU("LICENSE_STATUS_ID_DIFF");
		break;

	case LICENSE_STATUS_DUP:
		ret = _UU("LICENSE_STATUS_DUP");
		break;

	case LICENSE_STATUS_INSUFFICIENT:
		ret = _UU("LICENSE_STATUS_INSUFFICIENT");
		break;

	case LICENSE_STATUS_COMPETITION:
		ret = _UU("LICENSE_STATUS_COMPETITION");
		break;

	case LICENSE_STATUS_NONSENSE:
		ret = _UU("LICENSE_STATUS_NONSENSE");
		break;

	case LICENSE_STATUS_CPU:
		ret = _UU("LICENSE_STATUS_CPU");
		break;
	}

	return ret;
}

static char *li_keybit_chars = "ABCDEFGHJKLMNPQRSTUVWXYZ12345678";

// Convert the string to a key bit
bool LiStrToKeyBit(UCHAR *keybit, char *keystr)
{
	UINT x[36];
	UINT i, wp;
	char *str;
	// Validate arguments
	if (keybit == NULL || keystr == NULL)
	{
		return false;
	}

	str = CopyStr(keystr);
	Trim(str);

	wp = 0;
	if (StrLen(str) != 41)
	{
		Free(str);
		return false;
	}

	for (i = 0;i < 36;i++)
	{
		char c = str[wp++];
		UINT j;

		if (((i % 6) == 5) && (i != 35))
		{
			if (str[wp++] != '-')
			{
				Free(str);
				return false;
			}
		}

		x[i] = INFINITE;
		for (j = 0;j < 32;j++)
		{
			if (ToUpper(c) == li_keybit_chars[j])
			{
				x[i] = j;
			}
		}

		if (x[i] == INFINITE)
		{
			Free(str);
			return false;
		}
	}

	Zero(keybit, 23);

	keybit[0] = x[0] << 1 | x[1] >> 4;
	keybit[1] = x[1] << 4 | x[2] >> 1;
	keybit[2] = x[2] << 7 | x[3] << 2 | x[4] >> 3;
	keybit[3] = x[4] << 5 | x[5];

	keybit[4] = x[6] << 3 | x[7] >> 2;
	keybit[5] = x[7] << 6 | x[8] << 1 | x[9] >> 4;
	keybit[6] = x[9] << 4 | x[10] >> 1;
	keybit[7] = x[10] << 7 | x[11] << 2 | x[12] >> 3;
	keybit[8] = x[12] << 5 | x[13];

	keybit[9] = x[14] << 3 | x[15] >> 2;
	keybit[10] = x[15] << 6 | x[16] << 1 | x[17] >> 4;
	keybit[11] = x[17] << 4 | x[18] >> 1;
	keybit[12] = x[18] << 7 | x[19] << 2 | x[20] >> 3;
	keybit[13] = x[20] << 5 | x[21];

	keybit[14] = x[22] << 3 | x[23] >> 2;
	keybit[15] = x[23] << 6 | x[24] << 1 | x[25] >> 4;
	keybit[16] = x[25] << 4 | x[26] >> 1;
	keybit[17] = x[26] << 7 | x[27] << 2 | x[28] >> 3;
	keybit[18] = x[28] << 5 | x[29];

	keybit[19] = x[30] << 3 | x[31] >> 2;
	keybit[20] = x[31] << 6 | x[32] << 1 | x[33] >> 4;
	keybit[21] = x[33] << 4 | x[34] >> 1;
	keybit[22] = x[34] << 7 | x[35] << 2;

	Free(str);

	return true;
}

// Determine whether the string is a license key
bool LiIsLicenseKey(char *str)
{
	UCHAR keybit[23];
	// Validate arguments
	if (str == NULL)
	{
		return false;
	}

	if (LiStrToKeyBit(keybit, str) == false)
	{
		return false;
	}

	return true;
}