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42 lines
898 B
42 lines
898 B
package obfuscated2 |
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import ( |
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"encoding/binary" |
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"io" |
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) |
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// Metadata represents metadata received from header. |
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type Metadata struct { |
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Protocol [4]byte |
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DC uint16 |
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} |
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// Accept creates new io.ReadWriter for server-side deobfuscation. |
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func Accept(conn io.ReadWriter, secret []byte) (io.ReadWriter, Metadata, error) { |
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var ( |
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buf = make([]byte, 64) |
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meta Metadata |
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) |
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if _, err := io.ReadFull(conn, buf); err != nil { |
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return nil, meta, err |
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} |
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var k keys |
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if err := k.createStreams(buf, secret); err != nil { |
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return nil, meta, err |
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} |
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// Swap to match client's streams. |
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k.encrypt, k.decrypt = k.decrypt, k.encrypt |
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var decrypted [64]byte |
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k.decrypt.XORKeyStream(decrypted[:], buf) |
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copy(meta.Protocol[:], decrypted[56:60]) |
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meta.DC = binary.LittleEndian.Uint16(decrypted[60:62]) |
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return &Obfuscated2{ |
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rand: nil, // Used only in Handshake. |
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conn: conn, |
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keys: k, |
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}, meta, nil |
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}
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