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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package stateproof
import (
"fmt"
"strconv"
"strings"
"github.com/algorand/go-algorand/crypto"
"github.com/algorand/go-algorand/crypto/merklearray"
"github.com/algorand/go-algorand/crypto/merklesignature"
"github.com/algorand/go-algorand/data/basics"
)
// MessageHash represents the message that a state proof will attest to.
type MessageHash [32]byte
//msgp:ignore sigslot
type sigslot struct {
// Weight is the weight of the participant signing this message.
// This information is tracked here for convenience, but it does
// not appear in the commitment to the sigs array; it comes from
// the Weight field of the corresponding participant.
Weight uint64
// Include the parts of the sigslot that form the commitment to
// the sigs array.
sigslotCommit
}
// A sigslotCommit is a single slot in the sigs array that forms the state proof.
type sigslotCommit struct {
_struct struct{} `codec:",omitempty,omitemptyarray"`
// Sig is a signature by the participant on the expected message.
Sig merklesignature.Signature `codec:"s"`
// L is the total weight of signatures in lower-numbered slots.
// This is initialized once the builder has collected a sufficient
// number of signatures.
L uint64 `codec:"l"`
}
// Reveal is a single array position revealed as part of a state
// proof. It reveals an element of the signature array and
// the corresponding element of the participants array.
type Reveal struct {
_struct struct{} `codec:",omitempty,omitemptyarray"`
SigSlot sigslotCommit `codec:"s"`
Part basics.Participant `codec:"p"`
}
// StateProof represents a proof on Algorand's state.
type StateProof struct {
_struct struct{} `codec:",omitempty,omitemptyarray"`
SigCommit crypto.GenericDigest `codec:"c"`
SignedWeight uint64 `codec:"w"`
SigProofs merklearray.Proof `codec:"S,maxtotalbytes=SigPartProofMaxSize"`
PartProofs merklearray.Proof `codec:"P,maxtotalbytes=SigPartProofMaxSize"`
MerkleSignatureSaltVersion byte `codec:"v"`
// Reveals is a sparse map from the position being revealed
// to the corresponding elements from the sigs and participants
// arrays.
Reveals map[uint64]Reveal `codec:"r,allocbound=MaxReveals"`
PositionsToReveal []uint64 `codec:"pr,allocbound=MaxReveals"`
}
// SigPartProofMaxSize is the maximum valid size of SigProofs and PartProofs elements of the Stateproof struct in bytes.
// It is equal to merklearray.ProofMaxSizeByElements(config.StateProofTopVoters/2)
// See merklearray.Proof comment for explanation on the bound calculation
const SigPartProofMaxSize = 35353
func (s StateProof) stringBuild() (b strings.Builder) {
b.WriteString("StateProof: {")
defer b.WriteRune('}')
if s.MsgIsZero() {
return
}
b.WriteString(fmt.Sprintf("%v", s.SigCommit))
b.WriteString(", ")
b.WriteString(strconv.FormatUint(s.SignedWeight, 10))
b.WriteString(", ")
b.WriteString(strconv.Itoa(len(s.PositionsToReveal)))
return
}
func (s StateProof) String() string {
b := s.stringBuild()
return b.String()
}
// SortUint64 implements sorting by uint64 keys for
// canonical encoding of maps in msgpack format.
type SortUint64 = basics.SortUint64
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