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78 lines
2.5 KiB
78 lines
2.5 KiB
package types
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import (
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"bytes"
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"fmt"
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"github.com/tendermint/go-crypto"
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)
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// ErrEvidenceInvalid wraps a piece of evidence and the error denoting how or why it is invalid.
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type ErrEvidenceInvalid struct {
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Evidence Evidence
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ErrorValue error
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}
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func NewEvidenceInvalidErr(ev Evidence, err error) *ErrEvidenceInvalid {
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return &ErrEvidenceInvalid{ev, err}
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}
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// Error returns a string representation of the error.
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func (err *ErrEvidenceInvalid) Error() string {
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return fmt.Sprintf("Invalid evidence: %v. Evidence: %v", err.ErrorValue, err.Evidence)
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}
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// Evidence represents any provable malicious activity by a validator
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type Evidence interface {
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Verify(chainID string) error
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Address() []byte
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}
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//-------------------------------------------
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// DuplicateVoteEvidence contains evidence a validator signed two conflicting votes.
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type DuplicateVoteEvidence struct {
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PubKey crypto.PubKey
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VoteA *Vote
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VoteB *Vote
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}
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// Address returns the address of the validator.
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func (dve *DuplicateVoteEvidence) Address() []byte {
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return dve.PubKey.Address()
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}
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// Verify returns an error if the two votes aren't conflicting.
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// To be conflicting, they must be from the same validator, for the same H/R/S, but for different blocks.
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func (dve *DuplicateVoteEvidence) Verify(chainID string) error {
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// H/R/S must be the same
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if dve.VoteA.Height != dve.VoteB.Height ||
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dve.VoteA.Round != dve.VoteB.Round ||
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dve.VoteA.Type != dve.VoteB.Type {
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return fmt.Errorf("DuplicateVoteEvidence Error: H/R/S does not match. Got %v and %v", dve.VoteA, dve.VoteB)
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}
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// Address must be the same
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if !bytes.Equal(dve.VoteA.ValidatorAddress, dve.VoteB.ValidatorAddress) {
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return fmt.Errorf("DuplicateVoteEvidence Error: Validator addresses do not match. Got %X and %X", dve.VoteA.ValidatorAddress, dve.VoteB.ValidatorAddress)
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}
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// XXX: Should we enforce index is the same ?
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if dve.VoteA.ValidatorIndex != dve.VoteB.ValidatorIndex {
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return fmt.Errorf("DuplicateVoteEvidence Error: Validator indices do not match. Got %d and %d", dve.VoteA.ValidatorIndex, dve.VoteB.ValidatorIndex)
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}
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// BlockIDs must be different
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if dve.VoteA.BlockID.Equals(dve.VoteB.BlockID) {
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return fmt.Errorf("DuplicateVoteEvidence Error: BlockIDs are the same (%v) - not a real duplicate vote!", dve.VoteA.BlockID)
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}
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// Signatures must be valid
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if !dve.PubKey.VerifyBytes(SignBytes(chainID, dve.VoteA), dve.VoteA.Signature) {
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return ErrVoteInvalidSignature
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}
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if !dve.PubKey.VerifyBytes(SignBytes(chainID, dve.VoteB), dve.VoteB.Signature) {
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return ErrVoteInvalidSignature
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}
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return nil
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}
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