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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/>.
package transactions
import (
"bytes"
"github.com/algorand/go-algorand/crypto"
)
// EvalMaxArgs is the maximum number of arguments to an LSig
const EvalMaxArgs = 255
// LogicSig contains logic for validating a transaction.
// LogicSig is signed by an account, allowing delegation of operations.
// OR
// LogicSig defines a contract account.
type LogicSig struct {
_struct struct{} `codec:",omitempty,omitemptyarray"`
// Logic signed by Sig or Msig, OR hashed to be the Address of an account.
Logic []byte `codec:"l,allocbound=config.MaxLogicSigMaxSize"`
Sig crypto.Signature `codec:"sig"`
Msig crypto.MultisigSig `codec:"msig"`
// Args are not signed, but checked by Logic
Args [][]byte `codec:"arg,allocbound=EvalMaxArgs,allocbound=config.MaxLogicSigMaxSize"`
}
// Blank returns true if there is no content in this LogicSig
func (lsig *LogicSig) Blank() bool {
return len(lsig.Logic) == 0
}
// Len returns the length of Logic plus the length of the Args
// This is limited by config.ConsensusParams.LogicSigMaxSize
func (lsig *LogicSig) Len() int {
lsiglen := len(lsig.Logic)
for _, arg := range lsig.Args {
lsiglen += len(arg)
}
return lsiglen
}
// Equal returns true if both LogicSig are equivalent.
//
// Out of paranoia, Equal distinguishes zero-length byte slices
// from byte slice-typed nil values as they may have subtly
// different behaviors within the evaluation of a LogicSig,
// due to differences in msgpack encoding behavior.
func (lsig *LogicSig) Equal(b *LogicSig) bool {
sigs := lsig.Sig == b.Sig && lsig.Msig.Equal(b.Msig)
if !sigs {
return false
}
if !safeSliceCheck(lsig.Logic, b.Logic) {
return false
}
if len(lsig.Args) != len(b.Args) {
return false
}
for i := range lsig.Args {
if !safeSliceCheck(lsig.Args[i], b.Args[i]) {
return false
}
}
return true
}
func safeSliceCheck(a, b []byte) bool {
if a != nil && b != nil {
return bytes.Equal(a, b)
}
return a == nil && b == nil
}
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