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MachObfuscator/SymbolMangling/ExportTrieMangler/ExportTrieMangler.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| import Foundation | ||
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| protocol ExportTrieMangling: AnyObject { | ||
| func mangle(trie: Trie, fillingRootLabelWith labelFill: UInt8) -> Trie | ||
| } | ||
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| final class ExportTrieMangler: ExportTrieMangling { | ||
| func mangle(trie: Trie, fillingRootLabelWith labelFill: UInt8) -> Trie { | ||
| var trieCopy = trie | ||
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| trieCopy.label = trieCopy.label.map { _ in | ||
| labelFill | ||
| } | ||
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| trieCopy.children = trieCopy.children.enumerated().map { (index, child) -> Trie in | ||
| guard let labelFill = UInt8(exactly: index + 1) else { | ||
| fatalError("Trie label values probably exhausted at \(child.labelRange)") | ||
| } | ||
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| return mangle(trie: child, fillingRootLabelWith: labelFill) | ||
| } | ||
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| return trieCopy | ||
| } | ||
| } |
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64
MachObfuscatorTests/SymbolManglingTests/ExportTrieMangler_Tests.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| import XCTest | ||
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| class ExportTrieMangler_Tests: XCTestCase { | ||
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| var sut: ExportTrieMangler! | ||
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| var rootTrie: Trie! | ||
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| override func setUp() { | ||
| sut = ExportTrieMangler() | ||
| var childrenLayer0 = trieChildren(number: 3) | ||
| var childrenLayer1 = trieChildren(number: 2) | ||
| var childrenLayer2 = trieChildren(number: 2) | ||
| let childrenLayer3 = trieChildren(number: 2) | ||
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| childrenLayer2 = assignChildren(childrenLayer3, to: childrenLayer2) | ||
| childrenLayer1 = assignChildren(childrenLayer2, to: childrenLayer1) | ||
| childrenLayer0 = assignChildren(childrenLayer1, to: childrenLayer0) | ||
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| rootTrie = Trie(exportsSymbol: false, | ||
| labelRange: 0..<0, | ||
| label: [], | ||
| children: childrenLayer0) | ||
| } | ||
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| override func tearDown() { | ||
| sut = nil | ||
| rootTrie = nil | ||
| } | ||
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| func test_exportTrieObfuscation() { | ||
| let obfuscatedTrie = sut.mangle(trie: rootTrie, fillingRootLabelWith: 0) | ||
| XCTAssertEqual(obfuscatedTrie.label, []) | ||
| XCTAssertEqual(obfuscatedTrie.children[0].label, [1, 1, 1]) | ||
| XCTAssertEqual(obfuscatedTrie.children[0].children[1].label, [2, 2]) | ||
| XCTAssertEqual(obfuscatedTrie.children[1].label, [2, 2, 2]) | ||
| XCTAssertEqual(obfuscatedTrie.children[2].label, [3, 3, 3]) | ||
| XCTAssertEqual(obfuscatedTrie.children[2].children[0].label, [1, 1]) | ||
| XCTAssertEqual(obfuscatedTrie.children[2].children[1].label, [2, 2]) | ||
| } | ||
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| private func trieChildren(number: Int) -> [Trie] { | ||
| return (1...number).map { index in | ||
| return Trie(exportsSymbol: index % 2 == 0, | ||
| labelRange: 0..<UInt64(number), | ||
| label: randomLabels(count: number), | ||
| children: []) | ||
| } | ||
| } | ||
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| private func randomLabels(count: Int) -> [UInt8] { | ||
| return (0..<count).map { _ in | ||
| return (UInt8.random(in: 1...UInt8.max)) | ||
| } | ||
| } | ||
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| private func assignChildren(_ children: [Trie], to parent: [Trie]) -> [Trie] { | ||
| return parent.map { (trie) in | ||
| var copy = trie | ||
| copy.children = children | ||
| return copy | ||
| } | ||
| } | ||
| } |