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54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
// Copyright (c) 2020, The Garble Authors.
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// See LICENSE for licensing information.
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package literals
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import (
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"go/ast"
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"go/token"
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mathrand "math/rand"
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ah "mvdan.cc/garble/internal/asthelper"
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)
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type simple struct{}
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// check that the obfuscator interface is implemented
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var _ obfuscator = simple{}
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func (simple) obfuscate(obfRand *mathrand.Rand, data []byte) *ast.BlockStmt {
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key := make([]byte, len(data))
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obfRand.Read(key)
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op := randOperator(obfRand)
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for i, b := range key {
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data[i] = evalOperator(op, data[i], b)
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}
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return ah.BlockStmt(
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&ast.AssignStmt{
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Lhs: []ast.Expr{ast.NewIdent("key")},
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Tok: token.DEFINE,
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Rhs: []ast.Expr{ah.DataToByteSlice(key)},
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},
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&ast.AssignStmt{
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Lhs: []ast.Expr{ast.NewIdent("data")},
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Tok: token.DEFINE,
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Rhs: []ast.Expr{ah.DataToByteSlice(data)},
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},
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&ast.RangeStmt{
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Key: ast.NewIdent("i"),
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Value: ast.NewIdent("b"),
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Tok: token.DEFINE,
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X: ast.NewIdent("key"),
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Body: &ast.BlockStmt{List: []ast.Stmt{
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&ast.AssignStmt{
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Lhs: []ast.Expr{ah.IndexExpr("data", ast.NewIdent("i"))},
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Tok: token.ASSIGN,
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Rhs: []ast.Expr{operatorToReversedBinaryExpr(op, ah.IndexExpr("data", ast.NewIdent("i")), ast.NewIdent("b"))},
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},
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}},
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},
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)
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}
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