// Token: 0x06000753 RID: 1875 RVA: 0x0002FF98 File Offset: 0x0002E198
public static byte[] InitKey(byte[] key, byte[] data, int size)
{
YSDecrypt._dynamicKeyIndex = 0;
int num = (size >= 2048) ? 256 : (size >> 3);
uint num2 = (uint)((num ^ 3) & num);
byte[] array = new byte[16];
Buffer.BlockCopy(key, 0, array, 0, 16);
byte[] array2 = BH3ES.BH3ESDecrypt(array);
for (int i = 0; i < 16; i++)
{
array2[i] ^= YSKey.XorKey[i];
}
ulong num3 = ulong.MaxValue;
ulong num4 = 0UL;
ulong num5 = 0UL;
ulong num6 = 0UL;
byte[] result;
using (BinaryStream binaryStream = new BinaryStream(data, BinaryAccess.ReadWrite, null))
{
int num7 = 0;
while ((long)num7 < (long)((ulong)num2))
{
num3 ^= binaryStream.ReadUInt64(BinaryEndian.LittleEndian);
num4 ^= binaryStream.ReadUInt64(BinaryEndian.LittleEndian);
num5 ^= binaryStream.ReadUInt64(BinaryEndian.LittleEndian);
num6 ^= binaryStream.ReadUInt64(BinaryEndian.LittleEndian);
num7 += 4;
}
num3 ^= (num4 ^ num5 ^ num6);
if ((ulong)num2 != (ulong)((long)num))
{
long num8 = (long)num - (long)((ulong)num2);
int num9 = 0;
while ((long)num9 < num8)
{
num3 ^= binaryStream.ReadUInt64(BinaryEndian.LittleEndian);
num9++;
}
}
ulong num10 = BitConverter.ToUInt64(array2, 0);
ulong num11 = BitConverter.ToUInt64(array2, 8);
using (BinaryStream binaryStream2 = YSDecrypt.InitKeyData(num10 ^ num11 ^ num3 ^ 7936877569879298522UL ^ 11567864270080435830UL))
{
using (BinaryStream binaryStream3 = new BinaryStream(new byte[4096], BinaryAccess.ReadWrite, null))
{
for (int j = 0; j < 512; j++)
{
ulong dynamicKey = YSDecrypt.GetDynamicKey(binaryStream2);
binaryStream3.WriteUInt64(dynamicKey, BinaryEndian.LittleEndian);
}
result = binaryStream3.ToArray();
}
}
}
return(result);
}
// Token: 0x060006FC RID: 1788 RVA: 0x0002E814 File Offset: 0x0002CA14
private static void TransformMatrix(ref byte[] keyData, ref byte[] matrixData)
{
for (int i = 0; i < keyData.Length; i++)
{
uint num = 31U * (BH3ES.GetDynamicKey() % 31U) + 3U + (uint)((byte)(BH3ES.GetDynamicKey() & 63U));
for (int j = 0; j < 16; j++)
{
matrixData[i * 16 + j] = BH3Key.MatrixKey[(int)(checked ((IntPtr)(unchecked ((long)(2 * j) + (long)((ulong)num)))))];
}
byte b = keyData[i];
for (int k = 1; k < 16; k++)
{
b ^= matrixData[i * 16 + k];
}
matrixData[i * 16] = b;
}
}
// Token: 0x060006FA RID: 1786 RVA: 0x0002E6B8 File Offset: 0x0002C8B8
public static byte[] BH3ESDecrypt(byte[] keyData)
{
if (keyData.Length != 16)
{
throw new Exception("BH3ESDecrypt keyData Length is not 128bit");
}
byte[] array = new byte[256];
int i = 1;
BH3ES.TransformMatrix(ref keyData, ref array);
BH3ES.XorMatrix(ref array);
while (i < 10)
{
BH3ES.XorRoundKey(ref keyData, ref array);
BH3ES.TransformMatrix(ref keyData, ref array);
BH3ES.XorMatrix(ref array, i << 8);
i++;
}
BH3ES.MatrixToColumnKey(ref keyData, ref array);
BH3ES.TransformMatrix(ref keyData, ref array);
BH3ES.XorMatrix(ref array, i << 8);
BH3ES.MatrixToKey(ref keyData, ref array);
return(keyData);
}
