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https://github.com/sot-tech/mochi.git
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64b27c2df6
* add multiple addresses in request structures and frontend parsers * move per-ip peer fetch/store from storage to internal hooks * fetch/store both v1 and v2 info hashes
20 lines
611 B
Go
20 lines
611 B
Go
package random
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import (
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"encoding/binary"
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"github.com/sot-tech/mochi/bittorrent"
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)
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// DeriveEntropyFromRequest generates 2*64 bits of pseudo random state from an
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// AnnounceRequest.
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//
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// Calling DeriveEntropyFromRequest multiple times yields the same values.
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func DeriveEntropyFromRequest(req *bittorrent.AnnounceRequest) (v0 uint64, v1 uint64) {
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if len(req.InfoHash) >= bittorrent.InfoHashV1Len {
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v0 = binary.BigEndian.Uint64([]byte(req.InfoHash[:8])) + binary.BigEndian.Uint64([]byte(req.InfoHash[8:16]))
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}
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v1 = binary.BigEndian.Uint64(req.ID[:8]) + binary.BigEndian.Uint64(req.ID[8:16])
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return
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}
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