[Malleability C] flow.CertifiedBlock

[UlyanaAndrukhiv]

CertifiedBlock is a Block with acquired quorum. As ID() implementation is wrong, a byzantine consensus node can change the quorum certificate without being noticed by other nodes. The usage of this data structure should be reviewed to be proven safe.

type CertifiedBlock struct {
	Block        *Block
	CertifyingQC *QuorumCertificate
}

func (b *CertifiedBlock) ID() Identifier {
	return b.CertifyingQC.BlockID
}

type QuorumCertificate struct {
	View    uint64
	BlockID Identifier
	SignerIndices []byte
	SigData []byte
}