You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.7 KiB
96 lines
2.7 KiB
package multisig
|
|
|
|
import (
|
|
"github.com/tendermint/tendermint/crypto"
|
|
)
|
|
|
|
// PubKeyMultisigThreshold implements a K of N threshold multisig.
|
|
type PubKeyMultisigThreshold struct {
|
|
K uint `json:"threshold"`
|
|
PubKeys []crypto.PubKey `json:"pubkeys"`
|
|
}
|
|
|
|
var _ crypto.PubKey = PubKeyMultisigThreshold{}
|
|
|
|
// NewPubKeyMultisigThreshold returns a new PubKeyMultisigThreshold.
|
|
// Panics if len(pubkeys) < k or 0 >= k.
|
|
func NewPubKeyMultisigThreshold(k int, pubkeys []crypto.PubKey) crypto.PubKey {
|
|
if k <= 0 {
|
|
panic("threshold k of n multisignature: k <= 0")
|
|
}
|
|
if len(pubkeys) < k {
|
|
panic("threshold k of n multisignature: len(pubkeys) < k")
|
|
}
|
|
for _, pubkey := range pubkeys {
|
|
if pubkey == nil {
|
|
panic("nil pubkey")
|
|
}
|
|
}
|
|
return PubKeyMultisigThreshold{uint(k), pubkeys}
|
|
}
|
|
|
|
// VerifyBytes expects sig to be an amino encoded version of a MultiSignature.
|
|
// Returns true iff the multisignature contains k or more signatures
|
|
// for the correct corresponding keys,
|
|
// and all signatures are valid. (Not just k of the signatures)
|
|
// The multisig uses a bitarray, so multiple signatures for the same key is not
|
|
// a concern.
|
|
func (pk PubKeyMultisigThreshold) VerifyBytes(msg []byte, marshalledSig []byte) bool {
|
|
var sig Multisignature
|
|
err := cdc.UnmarshalBinaryBare(marshalledSig, &sig)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
size := sig.BitArray.Size()
|
|
// ensure bit array is the correct size
|
|
if len(pk.PubKeys) != size {
|
|
return false
|
|
}
|
|
// ensure size of signature list
|
|
if len(sig.Sigs) < int(pk.K) || len(sig.Sigs) > size {
|
|
return false
|
|
}
|
|
// ensure at least k signatures are set
|
|
if sig.BitArray.NumTrueBitsBefore(size) < int(pk.K) {
|
|
return false
|
|
}
|
|
// index in the list of signatures which we are concerned with.
|
|
sigIndex := 0
|
|
for i := 0; i < size; i++ {
|
|
if sig.BitArray.GetIndex(i) {
|
|
if !pk.PubKeys[i].VerifyBytes(msg, sig.Sigs[sigIndex]) {
|
|
return false
|
|
}
|
|
sigIndex++
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Bytes returns the amino encoded version of the PubKeyMultisigThreshold
|
|
func (pk PubKeyMultisigThreshold) Bytes() []byte {
|
|
return cdc.MustMarshalBinaryBare(pk)
|
|
}
|
|
|
|
// Address returns tmhash(PubKeyMultisigThreshold.Bytes())
|
|
func (pk PubKeyMultisigThreshold) Address() crypto.Address {
|
|
return crypto.AddressHash(pk.Bytes())
|
|
}
|
|
|
|
// Equals returns true iff pk and other both have the same number of keys, and
|
|
// all constituent keys are the same, and in the same order.
|
|
func (pk PubKeyMultisigThreshold) Equals(other crypto.PubKey) bool {
|
|
otherKey, sameType := other.(PubKeyMultisigThreshold)
|
|
if !sameType {
|
|
return false
|
|
}
|
|
if pk.K != otherKey.K || len(pk.PubKeys) != len(otherKey.PubKeys) {
|
|
return false
|
|
}
|
|
for i := 0; i < len(pk.PubKeys); i++ {
|
|
if !pk.PubKeys[i].Equals(otherKey.PubKeys[i]) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|