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50 lines
1.1 KiB
Go
50 lines
1.1 KiB
Go
package literals
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import (
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"go/ast"
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"go/token"
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ah "mvdan.cc/garble/internal/asthelper"
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)
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type xor struct{}
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// check that the obfuscator interface is implemented
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var _ obfuscator = xor{}
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func (x xor) obfuscate(data []byte) *ast.BlockStmt {
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key := make([]byte, len(data))
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genRandBytes(key)
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op := genRandOperator()
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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 &ast.BlockStmt{List: []ast.Stmt{
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&ast.AssignStmt{
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Lhs: []ast.Expr{ah.Ident("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{ah.Ident("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: ah.Ident("i"),
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Value: ah.Ident("b"),
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Tok: token.DEFINE,
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X: ah.Ident("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", ah.Ident("i"))},
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Tok: token.ASSIGN,
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Rhs: []ast.Expr{getReversedOperator(op, ah.IndexExpr("data", ah.Ident("i")), ah.Ident("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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