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Validate save header hash

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This commit is contained in:
Alex Barney 2018-07-21 22:05:57 -05:00
parent 9bd55e19a6
commit 83323b58c3
1 changed files with 30 additions and 11 deletions
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41
libhac/Savefile/Header.cs
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@ -1,4 +1,5 @@
using System.IO;
using System.Security.Cryptography;
namespace libhac.Savefile
{
@ -13,8 +14,14 @@ namespace libhac.Savefile
public MapEntry[] FileMapEntries { get; set; }
public MapEntry[] MetaMapEntries { get; set; }
public Header(BinaryReader reader)
public byte[] Data { get; }
public Header(BinaryReader reader, IProgressReport logger = null)
{
reader.BaseStream.Position = 0;
Data = reader.ReadBytes(0x4000);
reader.BaseStream.Position = 0;
Cmac = reader.ReadBytes(0x10);
reader.BaseStream.Position = 0x100;
@ -38,6 +45,18 @@ namespace libhac.Savefile
{
MetaMapEntries[i] = new MapEntry(reader);
}
var hashStatus = ValidateHeaderHash() ? "valid" : "invalid";
logger?.LogMessage($"Header hash is {hashStatus}");
}
private bool ValidateHeaderHash()
{
using (SHA256 sha256 = SHA256.Create())
{
var hash = sha256.ComputeHash(Data, 0x300, 0x3d00);
return Util.ArraysEqual(hash, Layout.Hash);
}
}
}
@ -62,11 +81,11 @@ namespace libhac.Savefile
public long JournalDataSizeA { get; set; }
public long JournalDataSizeB { get; set; }
public long SizeReservedArea { get; set; }
public long OffsetL1Bitmap0 { get; set; }
public long OffsetL1Bitmap1 { get; set; }
public long SizeL1Bitmap { get; set; }
public long MasterHashOffset { get; set; }
public long FieldC8 { get; set; }
public long L1BitmapOffset0 { get; set; }
public long L1BitmapOffset1 { get; set; }
public long L1BitmapSize { get; set; }
public long MasterHashOffset0 { get; set; }
public long MasterHashOffset1 { get; set; }
public long MasterHashSize { get; set; }
public long OffsetJournalTable { get; set; }
public long SizeJournalTable { get; set; }
@ -107,11 +126,11 @@ namespace libhac.Savefile
JournalDataSizeA = reader.ReadInt64();
JournalDataSizeB = reader.ReadInt64();
SizeReservedArea = reader.ReadInt64();
OffsetL1Bitmap0 = reader.ReadInt64();
OffsetL1Bitmap1 = reader.ReadInt64();
SizeL1Bitmap = reader.ReadInt64();
MasterHashOffset = reader.ReadInt64();
FieldC8 = reader.ReadInt64();
L1BitmapOffset0 = reader.ReadInt64();
L1BitmapOffset1 = reader.ReadInt64();
L1BitmapSize = reader.ReadInt64();
MasterHashOffset0 = reader.ReadInt64();
MasterHashOffset1 = reader.ReadInt64();
MasterHashSize = reader.ReadInt64();
OffsetJournalTable = reader.ReadInt64();
SizeJournalTable = reader.ReadInt64();