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Fix 3DS hasher bug

This commit is contained in:
CasualPokePlayer 2024-11-13 01:08:44 -08:00
parent ab4cb30011
commit c44a3a6b67
1 changed files with 2 additions and 2 deletions
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4
src/BizHawk.Emulation.Common/N3DSHasher.cs
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@ -19,7 +19,7 @@ namespace BizHawk.Emulation.Common
/// As 3DS roms may be >= 2GiB, too large for a .NET array /// As 3DS roms may be >= 2GiB, too large for a .NET array
/// As such, we need to perform a quick hash to identify them /// As such, we need to perform a quick hash to identify them
/// For this purpose, we re-use RetroAchievement's hashing formula /// For this purpose, we re-use RetroAchievement's hashing formula
/// Note that we assume here a CIA isn't be hashed, but rather its installed file (identical hash anyways) /// Note that we assume here a CIA isn't being hashed, but rather its installed file (identical hash anyways)
/// Reference code: https://github.com/RetroAchievements/rcheevos/blob/8d8ef920e253f1286464771e81ce4cf7f4358eee/src/rhash/hash.c#L1573-L2184 /// Reference code: https://github.com/RetroAchievements/rcheevos/blob/8d8ef920e253f1286464771e81ce4cf7f4358eee/src/rhash/hash.c#L1573-L2184
/// </summary> /// </summary>
public class N3DSHasher(byte[]? aesKeys, byte[]? seedDb) public class N3DSHasher(byte[]? aesKeys, byte[]? seedDb)
@ -353,7 +353,7 @@ namespace BizHawk.Emulation.Common
{ {
var ivCopy = new byte[iv.Length]; var ivCopy = new byte[iv.Length];
iv.AsSpan().CopyTo(ivCopy); iv.AsSpan().CopyTo(ivCopy);
exeFsSectionOffset &= 0xFU; exeFsSectionOffset &= ~0xFU;
// First decrypt these last bytes using the secondary key // First decrypt these last bytes using the secondary key
AesCtrTransform(aes, iv, exeFsBuffer.AsSpan((int)exeFsSectionOffset, (int)(0x10 - (exeFsSectionSize & 0xF)))); AesCtrTransform(aes, iv, exeFsBuffer.AsSpan((int)exeFsSectionOffset, (int)(0x10 - (exeFsSectionSize & 0xF))));