mirror of https://github.com/mautrix/go.git
45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
package message
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import (
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"encoding/binary"
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"fmt"
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"maunium.net/go/mautrix/crypto/goolm/crypto"
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"maunium.net/go/mautrix/crypto/olm"
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)
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const (
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sessionExportVersion = 0x01
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)
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// MegolmSessionExport represents a message in the session export format.
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type MegolmSessionExport struct {
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Counter uint32 `json:"counter"`
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RatchetData [128]byte `json:"data"`
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PublicKey crypto.Ed25519PublicKey `json:"public_key"`
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}
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// Encode returns the encoded message in the correct format.
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func (s MegolmSessionExport) Encode() []byte {
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output := make([]byte, 165)
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output[0] = sessionExportVersion
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binary.BigEndian.PutUint32(output[1:], s.Counter)
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copy(output[5:], s.RatchetData[:])
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copy(output[133:], s.PublicKey)
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return output
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}
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// Decode populates the struct with the data encoded in input.
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func (s *MegolmSessionExport) Decode(input []byte) error {
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if len(input) != 165 {
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return fmt.Errorf("decrypt: %w", olm.ErrBadInput)
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}
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if input[0] != sessionExportVersion {
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return fmt.Errorf("decrypt: %w", olm.ErrBadVersion)
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}
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s.Counter = binary.BigEndian.Uint32(input[1:5])
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copy(s.RatchetData[:], input[5:133])
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s.PublicKey = input[133:]
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return nil
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}
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