mirror of
https://github.com/Mezeporta/Erupe.git
synced 2026-03-22 15:43:49 +01:00
0e84377e21
Copy MHBridge into the Erupe module as cmd/protbot/ so it can be built, tested, and maintained alongside the server. The bot implements the full sign → entrance → channel login flow and supports lobby entry, chat, session setup, and quest enumeration. The conn/ package keeps its own Blowfish crypto primitives to avoid importing erupe-ce/config (which requires a config file at init).
38 lines
1022 B
Go
38 lines
1022 B
Go
package conn
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import "encoding/binary"
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var (
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bin8Key = []byte{0x01, 0x23, 0x34, 0x45, 0x56, 0xAB, 0xCD, 0xEF}
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sum32Table0 = []byte{0x35, 0x7A, 0xAA, 0x97, 0x53, 0x66, 0x12}
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sum32Table1 = []byte{0x7A, 0xAA, 0x97, 0x53, 0x66, 0x12, 0xDE, 0xDE, 0x35}
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)
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// CalcSum32 calculates the custom MHF "sum32" checksum.
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func CalcSum32(data []byte) uint32 {
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tableIdx0 := (len(data) + 1) & 0xFF
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tableIdx1 := int((data[len(data)>>1] + 1) & 0xFF)
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out := make([]byte, 4)
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for i := 0; i < len(data); i++ {
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key := data[i] ^ sum32Table0[(tableIdx0+i)%7] ^ sum32Table1[(tableIdx1+i)%9]
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out[i&3] = (out[i&3] + key) & 0xFF
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}
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return binary.BigEndian.Uint32(out)
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}
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func rotate(k *uint32) {
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*k = uint32(((54323 * uint(*k)) + 1) & 0xFFFFFFFF)
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}
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// DecryptBin8 decrypts MHF "binary8" data.
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func DecryptBin8(data []byte, key byte) []byte {
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k := uint32(key)
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output := make([]byte, len(data))
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for i := 0; i < len(data); i++ {
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rotate(&k)
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tmp := data[i] ^ byte((k>>13)&0xFF)
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output[i] = tmp ^ bin8Key[i&7]
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}
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return output
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}
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