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// Copyright (C) 2019-2023 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/>.
// dsign creates keys for signing data in LogicSig scripts.
//
// dsign creates signatures on data that will verify under
// the LogicSig ed25519verify opcode.
package main
import (
"encoding/base64"
"fmt"
"io"
"os"
"github.com/algorand/go-algorand/crypto"
"github.com/algorand/go-algorand/data/transactions"
"github.com/algorand/go-algorand/data/transactions/logic"
"github.com/algorand/go-algorand/protocol"
)
func failFast(err error) {
if err != nil {
panic(err)
}
}
func main() {
if len(os.Args) != 3 && len(os.Args) != 4 {
fmt.Fprintf(os.Stderr, "usage: %s <key-file> <lsig-file> <optional-data-file>\n", os.Args[0])
os.Exit(-1)
}
keyfname := os.Args[1]
lsigfname := os.Args[2]
kdata, err := os.ReadFile(keyfname)
failFast(err)
var seed crypto.Seed
copy(seed[:], kdata)
sec := crypto.GenerateSignatureSecrets(seed)
if len(os.Args) == 4 {
// In this mode, interpret lsig-file as raw program bytes and produce a signature
// over the data file
pdata, err := os.ReadFile(lsigfname)
failFast(err)
ddata, err := os.ReadFile(os.Args[3])
failFast(err)
dsig := sec.Sign(logic.Msg{
ProgramHash: crypto.HashObj(logic.Program(pdata)),
Data: ddata,
})
fmt.Fprintf(os.Stdout, "%s", base64.StdEncoding.EncodeToString(dsig[:]))
} else {
// In this mode, interpret lsig-file as a LogicSig struct and sign the
// txid of the transaction passed over stdin
pdata, err := os.ReadFile(lsigfname)
failFast(err)
var lsig transactions.LogicSig
err = protocol.Decode(pdata, &lsig)
failFast(err)
txdata, err := io.ReadAll(os.Stdin)
failFast(err)
var txn transactions.SignedTxn
err = protocol.Decode(txdata, &txn)
failFast(err)
txID := txn.ID()
dsig := sec.Sign(logic.Msg{
ProgramHash: crypto.HashObj(logic.Program(lsig.Logic)),
Data: txID[:],
})
lsig.Args = [][]byte{dsig[:]}
var out transactions.SignedTxn
out.Txn = txn.Txn
out.Lsig = lsig
protocol.EncodeStream(os.Stdout, out)
}
}
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