/
signature.go
92 lines (74 loc) · 2.05 KB
/
signature.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package smartbft
import (
"encoding/asn1"
"math/big"
"github.com/SmartBFT-Go/consensus/pkg/types"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/common/util"
"github.com/hyperledger/fabric/protos/common"
"github.com/pkg/errors"
)
type Signature struct {
Nonce []byte
SignatureHeader []byte
BlockHeader []byte
OrdererBlockMetadata []byte
AuxiliaryInput []byte
}
func (sig *Signature) Unmarshal(bytes []byte) error {
_, err := asn1.Unmarshal(bytes, sig)
return err
}
func (sig *Signature) Marshal() []byte {
bytes, err := asn1.Marshal(*sig)
if err != nil {
panic(err)
}
return bytes
}
func (sig Signature) AsBytes() []byte {
msg2Sign := util.ConcatenateBytes(sig.OrdererBlockMetadata, sig.SignatureHeader, sig.BlockHeader, sig.AuxiliaryInput)
return msg2Sign
}
func ProposalToBlock(proposal types.Proposal) (*common.Block, error) {
// initialize block with empty fields
block := &common.Block{
Data: &common.BlockData{},
Metadata: &common.BlockMetadata{},
}
if len(proposal.Header) == 0 {
return nil, errors.New("proposal header cannot be nil")
}
hdr := &asn1Header{}
if _, err := asn1.Unmarshal(proposal.Header, hdr); err != nil {
return nil, errors.Wrap(err, "bad header")
}
block.Header = &common.BlockHeader{
Number: hdr.Number.Uint64(),
PreviousHash: hdr.PreviousHash,
DataHash: hdr.DataHash,
}
if len(proposal.Payload) == 0 {
return nil, errors.New("proposal payload cannot be nil")
}
tuple := &ByteBufferTuple{}
if err := tuple.FromBytes(proposal.Payload); err != nil {
return nil, errors.Wrap(err, "bad payload and metadata tuple")
}
if err := proto.Unmarshal(tuple.A, block.Data); err != nil {
return nil, errors.Wrap(err, "bad payload")
}
if err := proto.Unmarshal(tuple.B, block.Metadata); err != nil {
return nil, errors.Wrap(err, "bad metadata")
}
return block, nil
}
type asn1Header struct {
Number *big.Int
PreviousHash []byte
DataHash []byte
}