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60 lines
2 KiB
Go
60 lines
2 KiB
Go
package smartcontract
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import (
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"fmt"
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"sort"
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"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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)
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// CreateMultiSigRedeemScript creates an "m out of n" type verification script
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// where n is the length of publicKeys.
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func CreateMultiSigRedeemScript(m int, publicKeys keys.PublicKeys) ([]byte, error) {
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if m < 1 {
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return nil, fmt.Errorf("param m cannot be smaller or equal to 1 got %d", m)
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}
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if m > len(publicKeys) {
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return nil, fmt.Errorf("length of the signatures (%d) is higher then the number of public keys", m)
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}
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if m > 1024 {
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return nil, fmt.Errorf("public key count %d exceeds maximum of length 1024", len(publicKeys))
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}
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buf := io.NewBufBinWriter()
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emit.Int(buf.BinWriter, int64(m))
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sort.Sort(publicKeys)
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for _, pubKey := range publicKeys {
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emit.Bytes(buf.BinWriter, pubKey.Bytes())
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}
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emit.Int(buf.BinWriter, int64(len(publicKeys)))
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emit.Opcodes(buf.BinWriter, opcode.PUSHNULL)
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emit.Syscall(buf.BinWriter, interopnames.NeoCryptoCheckMultisigWithECDsaSecp256r1)
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return buf.Bytes(), nil
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}
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// CreateDefaultMultiSigRedeemScript creates an "m out of n" type verification script
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// using publicKeys length with the default BFT assumptions of (n - (n-1)/3) for m.
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func CreateDefaultMultiSigRedeemScript(publicKeys keys.PublicKeys) ([]byte, error) {
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n := len(publicKeys)
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m := GetDefaultHonestNodeCount(n)
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return CreateMultiSigRedeemScript(m, publicKeys)
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}
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// CreateMajorityMultiSigRedeemScript creates an "m out of n" type verification script
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// using publicKeys length with m set to majority.
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func CreateMajorityMultiSigRedeemScript(publicKeys keys.PublicKeys) ([]byte, error) {
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n := len(publicKeys)
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m := n - (n-1)/2
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return CreateMultiSigRedeemScript(m, publicKeys)
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}
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// GetDefaultHonestNodeCount returns minimum number of honest nodes
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// required for network of size n.
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func GetDefaultHonestNodeCount(n int) int {
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return n - (n-1)/3
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}
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