[SHEHZADE//ABDULLAH ANSARI]
Red Team Consultant @ Google | MS in Cybersecurity @ NYU
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PUBLIC MIRRORGo v1.0
Multi-protocol network egress assessment and DLP verification framework featuring automated L4 sweeps, corporate proxy traversal, and covert protocol smuggling across 20+ channels.
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| 1 | package evasion |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "compress/gzip" |
| 6 | "compress/zlib" |
| 7 | "fmt" |
| 8 | "io" |
| 9 | |
| 10 | "github.com/klauspost/compress/zstd" |
| 11 | ) |
| 12 | |
| 13 | func Compress(data []byte, method CompressionMethod, level int) ([]byte, error) { |
| 14 | switch method { |
| 15 | case CompressNone, "": |
| 16 | return data, nil |
| 17 | case CompressZlib: |
| 18 | var buf bytes.Buffer |
| 19 | if level < zlib.DefaultCompression || level > zlib.BestCompression { |
| 20 | level = zlib.DefaultCompression |
| 21 | } |
| 22 | w, err := zlib.NewWriterLevel(&buf, level) |
| 23 | if err != nil { |
| 24 | return nil, err |
| 25 | } |
| 26 | if _, err := w.Write(data); err != nil { |
| 27 | return nil, err |
| 28 | } |
| 29 | if err := w.Close(); err != nil { |
| 30 | return nil, err |
| 31 | } |
| 32 | return buf.Bytes(), nil |
| 33 | case CompressGzip: |
| 34 | var buf bytes.Buffer |
| 35 | if level < gzip.DefaultCompression || level > gzip.BestCompression { |
| 36 | level = gzip.DefaultCompression |
| 37 | } |
| 38 | w, err := gzip.NewWriterLevel(&buf, level) |
| 39 | if err != nil { |
| 40 | return nil, err |
| 41 | } |
| 42 | if _, err := w.Write(data); err != nil { |
| 43 | return nil, err |
| 44 | } |
| 45 | if err := w.Close(); err != nil { |
| 46 | return nil, err |
| 47 | } |
| 48 | return buf.Bytes(), nil |
| 49 | case CompressZstd: |
| 50 | var buf bytes.Buffer |
| 51 | enc, err := zstd.NewWriter(&buf) |
| 52 | if err != nil { |
| 53 | return nil, err |
| 54 | } |
| 55 | if _, err := enc.Write(data); err != nil { |
| 56 | _ = enc.Close() |
| 57 | return nil, err |
| 58 | } |
| 59 | if err := enc.Close(); err != nil { |
| 60 | return nil, err |
| 61 | } |
| 62 | return buf.Bytes(), nil |
| 63 | default: |
| 64 | return nil, fmt.Errorf("unsupported compression method: %s", method) |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | func Decompress(data []byte, method CompressionMethod) ([]byte, error) { |
| 69 | switch method { |
| 70 | case CompressNone, "": |
| 71 | return data, nil |
| 72 | case CompressZlib: |
| 73 | r, err := zlib.NewReader(bytes.NewReader(data)) |
| 74 | if err != nil { |
| 75 | return nil, err |
| 76 | } |
| 77 | defer r.Close() |
| 78 | return io.ReadAll(r) |
| 79 | case CompressGzip: |
| 80 | r, err := gzip.NewReader(bytes.NewReader(data)) |
| 81 | if err != nil { |
| 82 | return nil, err |
| 83 | } |
| 84 | defer r.Close() |
| 85 | return io.ReadAll(r) |
| 86 | case CompressZstd: |
| 87 | dec, err := zstd.NewReader(bytes.NewReader(data)) |
| 88 | if err != nil { |
| 89 | return nil, err |
| 90 | } |
| 91 | defer dec.Close() |
| 92 | return io.ReadAll(dec) |
| 93 | default: |
| 94 | return nil, fmt.Errorf("unsupported decompression method: %s", method) |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | // CompressBytes compresses data using the specified compression method. |
| 99 | func CompressBytes(data []byte, method CompressionMethod) ([]byte, error) { |
| 100 | return Compress(data, method, 0) |
| 101 | } |
| 102 | |
| 103 | // DecompressBytes decompresses data using the specified compression method. |
| 104 | func DecompressBytes(data []byte, method CompressionMethod) ([]byte, error) { |
| 105 | return Decompress(data, method) |
| 106 | } |