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66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
package literals
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import (
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cryptrand "crypto/rand"
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"fmt"
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"go/ast"
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"go/token"
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mathrand "math/rand"
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"os"
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"strings"
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)
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// obfuscator takes a byte slice and converts it to a ast.BlockStmt
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type obfuscator interface {
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obfuscate(data []byte) *ast.BlockStmt
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}
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var (
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// obfuscators contains all types which implement the obfuscator Interface
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obfuscators = []obfuscator{
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xor{},
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swap{},
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}
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envGarbleSeed = os.Getenv("GARBLE_SEED")
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)
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// dataToByteSlice turns a byte slice like []byte{1, 2, 3} into an AST
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// expression
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func dataToByteSlice(data []byte) *ast.CallExpr {
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return &ast.CallExpr{
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Fun: &ast.ArrayType{
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Elt: &ast.Ident{Name: "byte"},
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},
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Args: []ast.Expr{&ast.BasicLit{
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Kind: token.STRING,
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Value: fmt.Sprintf("%q", data),
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}},
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}
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}
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// If math/rand.Seed() is not called, the generator behaves as if seeded by rand.Seed(1),
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// so the generator is deterministic.
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// genRandBytes return a random []byte with the length of size.
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func genRandBytes(buffer []byte) {
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if strings.HasPrefix(envGarbleSeed, "random;") {
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_, err := cryptrand.Read(buffer)
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if err != nil {
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panic(fmt.Sprintf("couldn't generate random key: %v", err))
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}
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} else {
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_, err := mathrand.Read(buffer)
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if err != nil {
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panic(fmt.Sprintf("couldn't generate random key: %v", err))
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}
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}
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}
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func genRandIntSlice(max, count int) []int {
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indexes := make([]int, count)
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for i := 0; i < count; i++ {
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indexes[i] = mathrand.Intn(max)
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}
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return indexes
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}
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