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调整 RvaDataAllocator实现，加解密新增 long ops接口

backup
walon 2025-05-07 10:14:55 +08:00
parent c00335fd41
commit 3ee44663fb
1 changed files with 25 additions and 18 deletions
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43
Editor/Emit/RvaDataAllocator.cs
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@ -38,11 +38,20 @@ namespace Obfuz.Emit
{
public FieldDef holderDataField;
public FieldDef runtimeValueField;
public long encryptionOps;
public uint size;
public List<byte> bytes;
public int minorSecret;
public int salt;
public void FillPadding()
public void FillPaddingToSize(int newSize)
{
for (int i = bytes.Count; i < newSize; i++)
{
bytes.Add(0xAB);
}
}
public void FillPaddingToEnd()
{
// fill with random value
for (int i = bytes.Count; i < size; i++)
@ -121,7 +130,8 @@ namespace Obfuz.Emit
runtimeValueField = runtimeValueField,
size = dataHolderType.ClassSize,
bytes = new List<byte>((int)dataHolderType.ClassSize),
minorSecret = _random.NextInt(),
encryptionOps = _random.NextLong(),
salt = _random.NextInt(),
};
_rvaFields.Add(newRvaField);
return newRvaField;
@ -143,17 +153,11 @@ namespace Obfuz.Emit
int expectedSize = offset + preservedSize;
if (expectedSize <= _currentField.size)
{
// insert random padding
for (int i = _currentField.bytes.Count; i < offset; i++)
{
//_currentField.bytes.Add((byte)_random.NextInt(0, 256));
// TODO replace with random value
_currentField.bytes.Add(0xAB);
}
_currentField.FillPaddingToSize(offset);
return _currentField;
}
_currentField.FillPadding();
_currentField.FillPaddingToEnd();
}
_currentField = CreateRvaField(maxRvaDataSize);
return _currentField;
@ -216,18 +220,18 @@ namespace Obfuz.Emit
return;
}
ModuleDef mod = _rvaTypeDef.Module;
var cctor = new MethodDefUser(".cctor",
var cctorMethod = new MethodDefUser(".cctor",
MethodSig.CreateStatic(_module.CorLibTypes.Void),
MethodImplAttributes.IL | MethodImplAttributes.Managed,
MethodAttributes.Static | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName | MethodAttributes.Private);
cctor.DeclaringType = _rvaTypeDef;
cctorMethod.DeclaringType = _rvaTypeDef;
//_rvaTypeDef.Methods.Add(cctor);
var body = new CilBody();
cctor.Body = body;
cctorMethod.Body = body;
var ins = body.Instructions;
IMethod initializeArrayMethod = mod.Import(typeof(System.Runtime.CompilerServices.RuntimeHelpers).GetMethod("InitializeArray", new[] { typeof(Array), typeof(RuntimeFieldHandle) }));
IMethod decryptArrayMethod = mod.Import(typeof(EncryptionService).GetMethod("DecryptBytes", new[] { typeof(byte[]), typeof(int) }));
IMethod decryptArrayMethod = mod.Import(typeof(EncryptionService).GetMethod("DecryptBlock", new[] { typeof(byte[]), typeof(long), typeof(int) }));
Assert.IsNotNull(initializeArrayMethod);
foreach (var field in _rvaFields)
@ -245,7 +249,10 @@ namespace Obfuz.Emit
ins.Add(Instruction.Create(OpCodes.Stsfld, field.runtimeValueField));
ins.Add(Instruction.Create(OpCodes.Ldtoken, field.holderDataField));
ins.Add(Instruction.Create(OpCodes.Call, initializeArrayMethod));
ins.Add(Instruction.Create(OpCodes.Ldc_I4, field.minorSecret));
// EncryptionService.DecryptBlock(array, field.encryptionOps, field.salt);
ins.Add(Instruction.Create(OpCodes.Ldc_I8, field.encryptionOps));
ins.Add(Instruction.Create(OpCodes.Ldc_I4, field.salt));
ins.Add(Instruction.Create(OpCodes.Call, decryptArrayMethod));
}
@ -259,10 +266,10 @@ namespace Obfuz.Emit
Assert.IsTrue(field.bytes.Count <= field.size);
if (field.bytes.Count < field.size)
{
field.FillPadding();
field.FillPaddingToEnd();
}
byte[] data = field.bytes.ToArray();
_encryptor.EncryptBytes(data, field.minorSecret);
_encryptor.EncryptBlock(data, field.encryptionOps, field.salt);
field.holderDataField.InitialValue = data;
}
}