forked from cosmos/cosmos-sdk
/
sigs.go
151 lines (127 loc) · 3.97 KB
/
sigs.go
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package tx
import (
"fmt"
"github.com/cosmos/cosmos-sdk/codec"
codectypes "github.com/cosmos/cosmos-sdk/codec/types"
cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
"github.com/cosmos/cosmos-sdk/types/tx"
"github.com/cosmos/cosmos-sdk/types/tx/signing"
)
// SignatureDataToModeInfoAndSig converts a SignatureData to a ModeInfo and raw bytes signature
func SignatureDataToModeInfoAndSig(data signing.SignatureData) (*tx.ModeInfo, []byte) {
if data == nil {
return nil, nil
}
switch data := data.(type) {
case *signing.SingleSignatureData:
return &tx.ModeInfo{
Sum: &tx.ModeInfo_Single_{
Single: &tx.ModeInfo_Single{Mode: data.SignMode},
},
}, data.Signature
case *signing.MultiSignatureData:
n := len(data.Signatures)
modeInfos := make([]*tx.ModeInfo, n)
sigs := make([][]byte, n)
for i, d := range data.Signatures {
modeInfos[i], sigs[i] = SignatureDataToModeInfoAndSig(d)
}
multisig := cryptotypes.MultiSignature{
Signatures: sigs,
}
sig, err := multisig.Marshal()
if err != nil {
panic(err)
}
return &tx.ModeInfo{
Sum: &tx.ModeInfo_Multi_{
Multi: &tx.ModeInfo_Multi{
Bitarray: data.BitArray,
ModeInfos: modeInfos,
},
},
}, sig
default:
panic(fmt.Sprintf("unexpected signature data type %T", data))
}
}
// ModeInfoAndSigToSignatureData converts a ModeInfo and raw bytes signature to a SignatureData or returns
// an error
func ModeInfoAndSigToSignatureData(modeInfo *tx.ModeInfo, sig []byte) (signing.SignatureData, error) {
switch modeInfo := modeInfo.Sum.(type) {
case *tx.ModeInfo_Single_:
return &signing.SingleSignatureData{
SignMode: modeInfo.Single.Mode,
Signature: sig,
}, nil
case *tx.ModeInfo_Multi_:
multi := modeInfo.Multi
sigs, err := decodeMultisignatures(sig)
if err != nil {
return nil, err
}
sigv2s := make([]signing.SignatureData, len(sigs))
for i, mi := range multi.ModeInfos {
sigv2s[i], err = ModeInfoAndSigToSignatureData(mi, sigs[i])
if err != nil {
return nil, err
}
}
return &signing.MultiSignatureData{
BitArray: multi.Bitarray,
Signatures: sigv2s,
}, nil
default:
panic(fmt.Errorf("unexpected ModeInfo data type %T", modeInfo))
}
}
// decodeMultisignatures safely decodes the raw bytes as a MultiSignature protobuf message
func decodeMultisignatures(bz []byte) ([][]byte, error) {
multisig := cryptotypes.MultiSignature{}
err := multisig.Unmarshal(bz)
if err != nil {
return nil, err
}
// NOTE: it is import to reject multi-signatures that contain unrecognized fields because this is an exploitable
// malleability in the protobuf message. Basically an attacker could bloat a MultiSignature message with unknown
// fields, thus bloating the transaction and causing it to fail.
if len(multisig.XXX_unrecognized) > 0 {
return nil, fmt.Errorf("rejecting unrecognized fields found in MultiSignature")
}
return multisig.Signatures, nil
}
func (g config) MarshalSignatureJSON(sigs []signing.SignatureV2) ([]byte, error) {
descs := make([]*signing.SignatureDescriptor, len(sigs))
for i, sig := range sigs {
descData := signing.SignatureDataToProto(sig.Data)
any, err := codectypes.NewAnyWithValue(sig.PubKey)
if err != nil {
return nil, err
}
descs[i] = &signing.SignatureDescriptor{
PublicKey: any,
Data: descData,
Sequence: sig.Sequence,
}
}
toJSON := &signing.SignatureDescriptors{Signatures: descs}
return codec.ProtoMarshalJSON(toJSON, nil)
}
func (g config) UnmarshalSignatureJSON(bz []byte) ([]signing.SignatureV2, error) {
var sigDescs signing.SignatureDescriptors
err := g.protoCodec.UnmarshalJSON(bz, &sigDescs)
if err != nil {
return nil, err
}
sigs := make([]signing.SignatureV2, len(sigDescs.Signatures))
for i, desc := range sigDescs.Signatures {
pubKey, _ := desc.PublicKey.GetCachedValue().(cryptotypes.PubKey)
data := signing.SignatureDataFromProto(desc.Data)
sigs[i] = signing.SignatureV2{
PubKey: pubKey,
Data: data,
Sequence: desc.Sequence,
}
}
return sigs, nil
}