mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-25 13:47:19 +00:00
32e3310205
It was always like that, but this important aspect was never documented. Signed-off-by: Roman Khimov <roman@nspcc.ru>
65 lines
2.1 KiB
Go
65 lines
2.1 KiB
Go
package smartcontract
|
|
|
|
import (
|
|
"fmt"
|
|
"sort"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
|
|
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
|
|
"github.com/nspcc-dev/neo-go/pkg/io"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
|
|
)
|
|
|
|
// CreateMultiSigRedeemScript creates an "m out of n" type verification script
|
|
// where n is the length of publicKeys. It modifies passed publicKeys by
|
|
// sorting them.
|
|
func CreateMultiSigRedeemScript(m int, publicKeys keys.PublicKeys) ([]byte, error) {
|
|
if m < 1 {
|
|
return nil, fmt.Errorf("param m cannot be smaller than 1, got %d", m)
|
|
}
|
|
if m > len(publicKeys) {
|
|
return nil, fmt.Errorf("length of the signatures (%d) is higher then the number of public keys", m)
|
|
}
|
|
if m > 1024 {
|
|
return nil, fmt.Errorf("public key count %d exceeds maximum of length 1024", len(publicKeys))
|
|
}
|
|
|
|
buf := io.NewBufBinWriter()
|
|
emit.Int(buf.BinWriter, int64(m))
|
|
sort.Sort(publicKeys)
|
|
for _, pubKey := range publicKeys {
|
|
emit.Bytes(buf.BinWriter, pubKey.Bytes())
|
|
}
|
|
emit.Int(buf.BinWriter, int64(len(publicKeys)))
|
|
emit.Syscall(buf.BinWriter, interopnames.SystemCryptoCheckMultisig)
|
|
|
|
return buf.Bytes(), nil
|
|
}
|
|
|
|
// CreateDefaultMultiSigRedeemScript creates an "m out of n" type verification script
|
|
// using publicKeys length with the default BFT assumptions of (n - (n-1)/3) for m.
|
|
func CreateDefaultMultiSigRedeemScript(publicKeys keys.PublicKeys) ([]byte, error) {
|
|
n := len(publicKeys)
|
|
m := GetDefaultHonestNodeCount(n)
|
|
return CreateMultiSigRedeemScript(m, publicKeys)
|
|
}
|
|
|
|
// CreateMajorityMultiSigRedeemScript creates an "m out of n" type verification script
|
|
// using publicKeys length with m set to majority.
|
|
func CreateMajorityMultiSigRedeemScript(publicKeys keys.PublicKeys) ([]byte, error) {
|
|
n := len(publicKeys)
|
|
m := GetMajorityHonestNodeCount(n)
|
|
return CreateMultiSigRedeemScript(m, publicKeys)
|
|
}
|
|
|
|
// GetDefaultHonestNodeCount returns minimum number of honest nodes
|
|
// required for network of size n.
|
|
func GetDefaultHonestNodeCount(n int) int {
|
|
return n - (n-1)/3
|
|
}
|
|
|
|
// GetMajorityHonestNodeCount returns minimum number of honest nodes
|
|
// required for majority-style agreement.
|
|
func GetMajorityHonestNodeCount(n int) int {
|
|
return n - (n-1)/2
|
|
}
|