flow

1for (int i = 0; i < ins.Count; i++) {
2    if (ins[i].OpCode != OpCodes.Call) continue;
3    if (!IsStringResolver(ins[i].Operand as IMethod)) continue;
4    // ldc.i4 x2 - ldsfld <fake> - ldfld <key> - xor - call
5    if (IsFakeLdfld(ins[i - 2], out var key) &&
6        ins[i - 1].OpCode == OpCodes.Xor) {
7        int off = (c0 ^ c1) ^ FieldValue(key);
8        ins[start].OpCode  = OpCodes.Ldstr;   // splice plaintext
9        ins[start].Operand = GetString(blob, off);
10        Nop(ins, start + 1, i);               // delete the math
11    }
12}