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package types
import (
"encoding/binary"
"fmt"
)
const (
// MessageSize is the number of bytes in a Trunnel-encoded leaf message
MessageSize = 8 + HashSize
// LeafSize is the number of bytes in a Trunnel-encoded leaf
LeafSize = MessageSize + SignatureSize + HashSize
// TreeHeadSize is the number of bytes in a Trunnel-encoded tree head
TreeHeadSize = 8 + 8 + HashSize + HashSize
)
// Marshal returns a Trunnel-encoded message
func (m *Message) Marshal() []byte {
buf := make([]byte, MessageSize)
binary.BigEndian.PutUint64(buf, m.ShardHint)
copy(buf[8:], m.Checksum[:])
return buf
}
// Marshal returns a Trunnel-encoded leaf
func (l *Leaf) Marshal() []byte {
buf := l.Message.Marshal()
buf = append(buf, l.SigIdent.Signature[:]...)
buf = append(buf, l.SigIdent.KeyHash[:]...)
return buf
}
// Marshal returns a Trunnel-encoded tree head
func (th *TreeHead) Marshal() []byte {
buf := make([]byte, TreeHeadSize)
binary.BigEndian.PutUint64(buf[0:8], th.Timestamp)
binary.BigEndian.PutUint64(buf[8:16], th.TreeSize)
copy(buf[16:16+HashSize], th.RootHash[:])
copy(buf[16+HashSize:], th.KeyHash[:])
return buf
}
// Unmarshal parses the Trunnel-encoded buffer as a leaf
func (l *Leaf) Unmarshal(buf []byte) error {
if len(buf) != LeafSize {
return fmt.Errorf("invalid leaf size: %v", len(buf))
}
// Shard hint
l.ShardHint = binary.BigEndian.Uint64(buf)
offset := 8
// Checksum
l.Checksum = &[HashSize]byte{}
copy(l.Checksum[:], buf[offset:offset+HashSize])
offset += HashSize
// Signature
l.Signature = &[SignatureSize]byte{}
copy(l.Signature[:], buf[offset:offset+SignatureSize])
offset += SignatureSize
// KeyHash
l.KeyHash = &[HashSize]byte{}
copy(l.KeyHash[:], buf[offset:])
return nil
}
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