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author | Wei-Ning Huang <w@byzantine-lab.io> | 2019-06-12 17:31:08 +0800 |
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committer | Wei-Ning Huang <w@byzantine-lab.io> | 2019-09-17 16:57:29 +0800 |
commit | ac088de6322fc16ebe75c2e5554be73754bf1fe2 (patch) | |
tree | 086b7827d46a4d07b834cd94be73beaabb77b734 /vendor/github.com/byzantine-lab/dexon-consensus/core/crypto/dkg/utils.go | |
parent | 67d565f3f0e398e99bef96827f729e3e4b0edf31 (diff) | |
download | go-tangerine-ac088de6322fc16ebe75c2e5554be73754bf1fe2.tar.gz go-tangerine-ac088de6322fc16ebe75c2e5554be73754bf1fe2.tar.zst go-tangerine-ac088de6322fc16ebe75c2e5554be73754bf1fe2.zip |
Rebrand as tangerine-network/go-tangerine
Diffstat (limited to 'vendor/github.com/byzantine-lab/dexon-consensus/core/crypto/dkg/utils.go')
-rw-r--r-- | vendor/github.com/byzantine-lab/dexon-consensus/core/crypto/dkg/utils.go | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/vendor/github.com/byzantine-lab/dexon-consensus/core/crypto/dkg/utils.go b/vendor/github.com/byzantine-lab/dexon-consensus/core/crypto/dkg/utils.go new file mode 100644 index 000000000..589480a3b --- /dev/null +++ b/vendor/github.com/byzantine-lab/dexon-consensus/core/crypto/dkg/utils.go @@ -0,0 +1,92 @@ +// Copyright 2018 The dexon-consensus Authors +// This file is part of the dexon-consensus library. +// +// The dexon-consensus library is free software: you can redistribute it +// and/or modify it under the terms of the GNU Lesser General Public License as +// published by the Free Software Foundation, either version 3 of the License, +// or (at your option) any later version. +// +// The dexon-consensus library is distributed in the hope that it will be +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser +// General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the dexon-consensus library. If not, see +// <http://www.gnu.org/licenses/>. + +package dkg + +import ( + "encoding/binary" + "fmt" + "math/rand" + + "github.com/byzantine-lab/bls/ffi/go/bls" + + "github.com/byzantine-lab/dexon-consensus/core/crypto" +) + +// PartialSignature is a partial signature in DKG+TSIG protocol. +type PartialSignature crypto.Signature + +var ( + // ErrEmptySignature is reported if the signature is empty. + ErrEmptySignature = fmt.Errorf("invalid empty signature") +) + +// RecoverSignature recovers TSIG signature. +func RecoverSignature(sigs []PartialSignature, signerIDs IDs) ( + crypto.Signature, error) { + blsSigs := make([]bls.Sign, len(sigs)) + for i, sig := range sigs { + if len(sig.Signature) == 0 { + return crypto.Signature{}, ErrEmptySignature + } + if err := blsSigs[i].Deserialize([]byte(sig.Signature)); err != nil { + return crypto.Signature{}, err + } + } + var recoverSig bls.Sign + if err := recoverSig.Recover(blsSigs, []bls.ID(signerIDs)); err != nil { + return crypto.Signature{}, err + } + return crypto.Signature{ + Type: cryptoType, + Signature: recoverSig.Serialize()}, nil +} + +// RecoverGroupPublicKey recovers group public key. +func RecoverGroupPublicKey(pubShares []*PublicKeyShares) *PublicKey { + var pub *PublicKey + for _, pubShare := range pubShares { + pk0 := pubShare.masterPublicKey[0] + if pub == nil { + pub = &PublicKey{ + publicKey: pk0, + } + } else { + pub.publicKey.Add(&pk0) + } + } + return pub +} + +// NewRandomPrivateKeyShares constructs a private key shares randomly. +func NewRandomPrivateKeyShares() *PrivateKeyShares { + // Generate IDs. + rndIDs := make(IDs, 0, 10) + for i := range rndIDs { + id := make([]byte, 8) + binary.LittleEndian.PutUint64(id, rand.Uint64()) + rndIDs[i] = NewID(id) + } + prvShares := NewEmptyPrivateKeyShares() + prvShares.SetParticipants(rndIDs) + for _, id := range rndIDs { + if err := prvShares.AddShare(id, NewPrivateKey()); err != nil { + panic(err) + } + } + return prvShares +} |