public static string EncryptString(string inputString, string encryptionKey, bool encodeStrings)
{
return(encodeStrings
? EncodeString(ProtectionHelper.AesEncrypt(inputString, encryptionKey))
: ProtectionHelper.AesEncrypt(inputString, encryptionKey));
}
// TODO: Make 'ByteGuardGetInteger' method take only one parameter.
public static void EmbedConstants(ModuleDef targetModule, string decryptionKey, bool compressConstants = true)
{
List <byte> constantByteList = new List <byte>();
// Finds the injected 'ByteGuardProtection' class that contains all the decryption methods.
TypeDef constantProtections = targetModule.Find("ByteGuard.Protections.Online.Runtime.ByteGuardConstantProtections", true);
// Finds the 'DecodeAndDecrypt' method located in the 'ByteGuardProtection' class/type.
MethodDef byteguardGetInteger = constantProtections.FindMethod("ByteGuardGetInteger");
// Iterates through all the types and methods that are editable.
foreach (TypeDef t in targetModule.GetTypes().Where(type => !type.Namespace.Contains("ByteGuard.Protections.Online.Runtime")))
{
foreach (MethodDef m in t.Methods.Where(mtd => mtd.HasBody))
{
// Simplifies all macros so that all constants can be encrypted.
m.Body.SimplifyMacros(m.Parameters);
// Iterates through each instruction inside the method body.
for (int i = 0; i < m.Body.Instructions.Count; i++)
{
// Stores the current instruction into a variable for us to work with.
Instruction ins = m.Body.Instructions[i];
// If the current instruction is a constant.
if (ins.IsLdcI4())
{
// Randomly generates an integer that is within the size of a byte.
int randomInteger = R.Next(0, 128);
// Inserts a call to the method that will get the constant from resources.
m.Body.Instructions.Insert(i + 1, Instruction.CreateLdcI4(Convert.ToInt32(ins.Operand) ^ randomInteger));
m.Body.Instructions.Insert(i + 2, Instruction.Create(OpCodes.Call, byteguardGetInteger));
ins.Operand = constantByteList.Count;
// Adds the generated byte to the byte list.
constantByteList.Add(Convert.ToByte(randomInteger));
// Skips the newly added instructions.
i += 2;
}
}
// Optimizes macros to increase performed and reduce file size.
m.Body.OptimizeMacros();
}
}
// Converts the constant byte list into a byte array.
byte[] constantListBytes = constantByteList.ToArray();
// Creates a name for the resource.
string resourceName = Runtime.ByteGuardHelper.GetMd5(EmbeddedResourceName = R.Next(1, 1000000).ToString());
// Creates an encryption key to encrypt the embedded resource with.
string resourceEncryptionKey = resourceName + Runtime.ByteGuardHelper.GetMd5(decryptionKey);
// Encrypts the byte array.
constantListBytes = ProtectionHelper.AesEncrypt(constantListBytes, resourceEncryptionKey);
// Compresses the byte array if the user has decided to compress.
//if (compressBool)
//constantListBytes = ProtectionHelper.GzipCompressBytes(constantListBytes);
//else
//Protection.Miscellaneous.ProtectionHelper.SetByteGuardBool(ByteGuardProtection, "DecompressEmbeddedConstants", false);
constantListBytes = ProtectionHelper.GzipCompressBytes(constantListBytes);
// Adds the byte array as an embedded resource to the module.
EmbeddedResource constantResource = new EmbeddedResource(resourceName, constantListBytes);
targetModule.Resources.Add(constantResource);
CallLoadIntegersMethod(targetModule, false);
}
// TODO: Complete this.
private static void EmbedOfflineStrings(ModuleDef targetModule)
{
// Finds the injected 'ByteGuardStringProtections' class that contains all the decryption methods.
TypeDef stringProtections =
targetModule.Find("ByteGuard.Protections.Online.Runtime.ByteGuardStringProtections", true);
// Finds the 'DecodeAndDecrypt' method located in the 'ByteGuardProtection' class/type.
MethodDef getStringOfflineMethod = stringProtections.FindMethod("GetStringOffline");
// Creates an integer variable that will hold the starting index of each string.
int stringIndex = 0;
// A list collection for the method strings to be added to.
List <string> stringList = new List <string>();
// Iterates through all the types and methods that are editable.
foreach (TypeDef t in targetModule.GetTypes().Where(type => type.Namespace.Contains("ByteGuard.Protections.Online.Runtime")))
{
foreach (MethodDef m in t.Methods.Where(mtd => mtd.HasBody && mtd.Name != "LoadIntegers" && mtd.Name != "LoadStrings" && mtd.Name != "LoadStringsOffline" && mtd.Name != "GetMd5"))
{
// Iterates through each instruction inside the method body.
for (int i = 0; i < m.Body.Instructions.Count; i++)
{
// Stores the current instruction into a new variable.
Instruction ins = m.Body.Instructions[i];
// Checks that the current instruction is a string and is not null.
if (ins.Operand is string)
{
// Stores the string into a string variable.
string stringToEmbed = ins.Operand.ToString();
// Adds the string to be embedded into the StringList collection.
stringList.Add(stringToEmbed);
// Changes the opcode and operand of the current instruction to hold the strings starting index.
ins.OpCode = OpCodes.Ldc_I4;
ins.Operand = stringIndex;
// Inserts two new instructions containing the string length and the call to the 'GetString' method.
m.Body.Instructions.Insert(i + 1, Instruction.CreateLdcI4(stringToEmbed.Length));
m.Body.Instructions.Insert(i + 2, Instruction.Create(OpCodes.Call, getStringOfflineMethod));
// Increases the StringIndex variable by the size of the string.
stringIndex += stringToEmbed.Length;
// Increase the counter by 3 to skip over the newly added instructions.
i += 2;
}
}
}
}
// Converts the 'StringList' collection into a byte array.
byte[] stringListBytes = stringList.SelectMany(s => Encoding.UTF8.GetBytes(s)).ToArray();
// ResourceName = MD5Hash of randomly genereted integer. (Generated at the start of obfuscation).
string resourceName = Runtime.ByteGuardHelper.GetMd5(StringProtections.EmbeddedResourceNameOffline = R.Next(1, 1000000).ToString());
// TODO: Encrypt.
// Creates the ResourceEncryptionKey that will be used to encrypt the embedded constants.
//string resourceEncryptionKey = resourceName + Runtime.ByteGuardHelper.GetMd5(decryptionKey);
// Encrypts the embedded string bytes using the generated encryption key.
//stringListBytes = ProtectionHelper.AesEncrypt(stringListBytes, resourceEncryptionKey);
// Compresses the bytes.
stringListBytes = ProtectionHelper.GzipCompressBytes(stringListBytes);
// Embeds the byte array as a resource to the target module.
EmbeddedResource stringsResource = new EmbeddedResource(resourceName, stringListBytes);//EmbeddedResourceName, StringListBytes);
targetModule.Resources.Add(stringsResource);
CallLoadStringsMethod(targetModule, true);
}
