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Rework Qualcomm Partition to also work with modern day ed loaders

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This commit is contained in:
Gustave Monce
2024-08-27 10:08:47 +02:00
parent ab0c35e879
commit c6f6ef4429
1 changed files with 37 additions and 26 deletions
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WPinternals/Models/QualcommPartition.cs
+37 -26
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@@ -19,6 +19,7 @@
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
@@ -128,45 +129,55 @@ namespace WPinternals
CertificatesSize = ByteOperations.ReadUInt32(Binary, HeaderOffset + 0X1C);
CertificatesOffset = CertificatesAddress - ImageAddress + ImageOffset;
uint CurrentCertificateOffset = CertificatesOffset;
uint CertificateSize = 0;
while (CurrentCertificateOffset < (CertificatesOffset + CertificatesSize))
using MemoryStream fileStream = new(Binary);
using BinaryReader reader = new(fileStream);
List<byte[]> Signatures = [];
uint LastOffset = 0;
for (uint i = 0; i < fileStream.Length - 6; i++)
{
if ((Binary[CurrentCertificateOffset] == 0x30) && (Binary[CurrentCertificateOffset + 1] == 0x82))
fileStream.Seek(i, SeekOrigin.Begin);
ushort offset0 = reader.ReadUInt16();
short offset1 = (short)((reader.ReadByte() << 8) | reader.ReadByte());
ushort offset2 = reader.ReadUInt16();
if (offset0 == 0x8230 && offset1 >= 0 && offset2 == 0x8230)
{
CertificateSize = (uint)(Binary[CurrentCertificateOffset + 2] * 0x100) + Binary[CurrentCertificateOffset + 3] + 4; // Big endian!
uint CertificateSize = (uint)offset1 + 4; // Header Size is 4
if ((CurrentCertificateOffset + CertificateSize) == (CertificatesOffset + CertificatesSize))
bool IsCertificatePartOfExistingChain = LastOffset == 0 || LastOffset == i;
if (!IsCertificatePartOfExistingChain)
{
// This is the last certificate. So this is the root key.
RootKeyHash = SHA256.HashData(Binary.AsSpan((int)CurrentCertificateOffset, (int)CertificateSize));
break;
}
LastOffset = i + CertificateSize;
fileStream.Seek(i, SeekOrigin.Begin);
Signatures.Add(reader.ReadBytes((int)CertificateSize));
}
}
byte[] RootCertificate = Signatures[^1];
for (int i = 0; i < Signatures.Count; i++)
{
if (i + 1 != Signatures.Count)
{
#if DEBUG
System.Diagnostics.Debug.Print("RKH: " + Converter.ConvertHexToString(RootKeyHash, ""));
System.Diagnostics.Debug.Print("Cert: " + Converter.ConvertHexToString(SHA256.HashData(Signatures[i]), ""));
#endif
}
#if DEBUG
else
{
System.Diagnostics.Debug.Print("Cert: " + Converter.ConvertHexToString(SHA256.HashData(Binary.AsSpan((int)CurrentCertificateOffset, (int)CertificateSize)), ""));
}
#endif
CurrentCertificateOffset += CertificateSize;
}
else
{
if ((RootKeyHash == null) && (CurrentCertificateOffset > CertificatesOffset))
{
CurrentCertificateOffset -= CertificateSize;
// This is the last certificate. So this is the root key.
RootKeyHash = SHA256.HashData(Binary.AsSpan((int)CurrentCertificateOffset, (int)CertificateSize));
// This is the last certificate. So this is the root key.
RootKeyHash = SHA256.HashData(Signatures[i]);
#if DEBUG
System.Diagnostics.Debug.Print("RKH: " + Converter.ConvertHexToString(RootKeyHash, ""));
System.Diagnostics.Debug.Print("RKH: " + Converter.ConvertHexToString(RootKeyHash, ""));
#endif
}
break;
}
}
}