/// <summary>
/// Resigns save data.
/// </summary>
/// <param name="sav7">The save data to resign.</param>
/// <param name="throwIfUnsupported">If true, throw an <see cref="InvalidOperationException"/> if MemeCrypto is unsupported. If false, calling this function will have no effect.</param>
/// <exception cref="InvalidOperationException">Thrown if the current platform has FIPS mode enabled on a platform that does not support the required crypto service providers.</exception>
/// <returns>The resigned save data.</returns>
public static byte[] Resign(byte[] sav7, bool throwIfUnsupported = true)
{
if (sav7 == null || sav7.Length != 0x6BE00)
{
return(null);
}
try
{
byte[] outSav = (byte[])sav7.Clone();
using (var sha256 = Util.GetSHA256Provider())
{
byte[] CurSig = new byte[0x80];
Array.Copy(sav7, 0x6BB00, CurSig, 0, 0x80);
byte[] ChecksumTable = new byte[0x140];
Array.Copy(sav7, 0x6BC00, ChecksumTable, 0, 0x140);
SignMemeData(sha256.ComputeHash(ChecksumTable).Concat(ReverseCrypt(CurSig) ?? new byte[0x60]).ToArray()).CopyTo(outSav, 0x6BB00);
}
return(outSav);
}
catch (InvalidOperationException)
{
if (throwIfUnsupported)
{
throw;
}
else
{
return((byte[])sav7.Clone());
}
}
}
public static bool CanUseMemeCrypto()
{
try
{
Util.GetSHA256Provider();
}
catch (InvalidOperationException)
{
return(false);
}
return(true);
}
/// <summary>
/// Resigns save data.
/// </summary>
/// <param name="sav7">The save data to resign.</param>
/// <param name="throwIfUnsupported">
/// If true, throw an <see cref="InvalidOperationException" /> if MemeCrypto is
/// unsupported. If false, calling this function will have no effect.
/// </param>
/// <exception cref="InvalidOperationException">
/// Thrown if the current platform has FIPS mode enabled on a platform that
/// does not support the required crypto service providers.
/// </exception>
/// <returns>The resigned save data.</returns>
public static byte[] Resign(byte[] sav7, bool throwIfUnsupported = true)
{
if (sav7 == null || sav7.Length != 0x6BE00)
{
return(null);
}
try
{
var outSav = (byte[])sav7.Clone();
using (var sha256 = Util.GetSHA256Provider())
{
var CurSig = new byte[0x80];
Array.Copy(sav7, 0x6BB00, CurSig, 0, 0x80);
var ChecksumTable = new byte[0x140];
Array.Copy(sav7, 0x6BC00, ChecksumTable, 0, 0x140);
var newSig = new byte[0x80];
sha256.ComputeHash(ChecksumTable).CopyTo(newSig, 0);
var memeSig = VerifyMemeData(CurSig);
if (memeSig != null)
{
Array.Copy(memeSig, 0x20, newSig, 0x20, 0x60);
}
SignMemeData(newSig).CopyTo(outSav, 0x6BB00);
}
return(outSav);
}
catch (InvalidOperationException)
{
if (throwIfUnsupported)
{
throw;
}
return((byte[])sav7.Clone());
}
}