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package types
import (
"crypto/ed25519"
"crypto/sha256"
)
const (
HashSize = sha256.Size
SignatureSize = ed25519.SignatureSize
)
// Leaf is the log's Merkle tree leaf.
//
// Ref: https://github.com/system-transparency/stfe/blob/design/doc/api.md#merkle-tree-leaf
type Leaf struct {
Message
SigIdent
}
// Message is composed of a shard hint and a checksum. The submitter selects
// these values to fit the log's shard interval and the opaque data in question.
type Message struct {
ShardHint uint64
Checksum [HashSize]byte
}
// SigIdent is composed of a signature-signer pair. The signature is computed
// over the Trunnel-serialized leaf message. KeyHash identifies the signer.
type SigIdent struct {
Signature [SignatureSize]byte
KeyHash [HashSize]byte
}
// SignedTreeHead is composed of a tree head and a list of signature-signer
// pairs. Each signature is computed over the Trunnel-serialized tree head.
//
// Ref: https://github.com/system-transparency/stfe/blob/design/doc/api.md#get-tree-head-cosigned
// Ref: https://github.com/system-transparency/stfe/blob/design/doc/api.md#get-tree-head-to-sign
// Ref: https://github.com/system-transparency/stfe/blob/design/doc/api.md#get-tree-head-latest
type SignedTreeHead struct {
TreeHead
SigIdent []SigIdent
}
// TreeHead is the log's tree head.
//
// Ref: https://github.com/system-transparency/stfe/blob/design/doc/api.md#merkle-tree-head
type TreeHead struct {
Timestamp uint64
TreeSize uint64
RootHash [HashSize]byte
}
// ConsistencyProof is a consistency proof that proves the log's append-only
// property.
//
// Ref: https://github.com/system-transparency/stfe/blob/design/doc/api.md#get-consistency-proof
type ConsistencyProof struct {
NewSize uint64
OldSize uint64
Path [][HashSize]byte
}
// InclusionProof is an inclusion proof that proves a leaf is included in the
// log.
//
// Ref: https://github.com/system-transparency/stfe/blob/design/doc/api.md#get-proof-by-hash
type InclusionProof struct {
TreeSize uint64
LeafIndex uint64
Path [][HashSize]byte
}
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