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59 lines
2.5 KiB
59 lines
2.5 KiB
#pragma once
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#include <obf/transform/transform.hpp>
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#include <recomp/reloc.hpp>
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namespace theo::obf::transform {
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/// <summary>
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/// generate a sequence of transformations given an instruction that has a
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/// relocation in it.
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/// </summary>
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/// <param name="inst">instruction that has a relocation in it.</param>
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/// <param name="reloc">meta data relocation object for the instruction.</param>
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/// <param name="low">lowest number of transformations to generate.</param>
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/// <param name="high">highest number of transformations to generate.</param>
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/// <returns></returns>
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inline std::vector<std::uint8_t> generate(xed_decoded_inst_t* inst,
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recomp::reloc_t* reloc,
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std::uint8_t low,
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std::uint8_t high) {
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auto num_transforms = transform::operation_t::random(low, high);
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auto num_ops = transform::operations.size();
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std::vector<std::uint8_t> new_inst_bytes;
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std::uint32_t inst_len = {};
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std::uint8_t inst_buff[XED_MAX_INSTRUCTION_BYTES];
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xed_encoder_request_t req;
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xed_state_t istate{XED_MACHINE_MODE_LONG_64, XED_ADDRESS_WIDTH_64b};
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xed_encoder_request_zero_set_mode(&req, &istate);
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xed_encoder_request_set_effective_operand_width(&req, 64);
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xed_encoder_request_set_iclass(&req, XED_ICLASS_PUSHFQ);
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xed_encode(&req, inst_buff, sizeof(inst_buff), &inst_len);
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new_inst_bytes.insert(new_inst_bytes.end(), inst_buff, inst_buff + inst_len);
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for (auto cnt = 0u; cnt < num_transforms; ++cnt) {
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std::uint32_t imm = transform::operation_t::random(
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0, std::numeric_limits<std::int32_t>::max());
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auto itr = transform::operations.begin();
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std::advance(itr, transform::operation_t::random(0, num_ops - 1));
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auto transform_bytes = itr->second->native(inst, imm);
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new_inst_bytes.insert(new_inst_bytes.end(), transform_bytes.begin(),
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transform_bytes.end());
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reloc->add_transform(
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{transform::operations[itr->second->inverse()]->get_transform(), imm});
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}
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xed_encoder_request_zero_set_mode(&req, &istate);
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xed_encoder_request_set_effective_operand_width(&req, 64);
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xed_encoder_request_set_iclass(&req, XED_ICLASS_POPFQ);
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xed_encode(&req, inst_buff, sizeof(inst_buff), &inst_len);
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new_inst_bytes.insert(new_inst_bytes.end(), inst_buff, inst_buff + inst_len);
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// inverse the order in which the transformations are executed...
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//
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std::reverse(reloc->get_transforms().begin(), reloc->get_transforms().end());
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return new_inst_bytes;
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}
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} // namespace theo::obf::transform
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