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43 lines
898 B
43 lines
898 B
3 years ago
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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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