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66 lines
2.7 KiB
66 lines
2.7 KiB
// Copyright (c) 2022, _xeroxz
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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#pragma once
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#include <obf/pass.hpp>
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#include <obf/transform/operation.hpp>
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#include <obf/transform/transform.hpp>
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namespace theo::obf {
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/// <summary>
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/// this pass is like the next_inst_pass, however, relocations are encrypted
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/// with transformations instead of the address of the next instruction. this
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/// pass only runs at the instruction level and appends transformations into the
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/// reloc_t object of the instruction symbol.
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///
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/// given the following code:
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///
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/// mov rax, &MessageBoxA
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///
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/// this pass will generate a random number of transformations to encrypt the
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/// address of "MessageBoxA". These transformations will then be applied by
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/// theodosius internally when resolving relocations.
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///
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/// mov rax, enc_MessageBoxA
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/// xor rax, 0x389284324
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/// add rax, 0x345332567
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/// ror rax, 0x5353
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/// </summary>
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class reloc_transform_pass_t : public pass_t {
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explicit reloc_transform_pass_t() : pass_t(decomp::sym_type_t::instruction){};
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public:
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static reloc_transform_pass_t* get();
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void run(decomp::symbol_t* sym);
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private:
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std::optional<recomp::reloc_t*> has_legit_reloc(decomp::symbol_t* sym);
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};
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} // namespace theo::obf
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