diff options
author | Javier Peletier <jm@epiclabs.io> | 2018-10-03 15:15:17 +0800 |
---|---|---|
committer | Javier Peletier <jm@epiclabs.io> | 2018-10-03 15:15:28 +0800 |
commit | de01178c18766b9f744acc94fe2b96804f998e40 (patch) | |
tree | b572a263ff660bd5ded343a5253f86f1f1145e46 /swarm/storage/feed/sign.go | |
parent | 696bc9b01ce0ed3347fa1bd64460ccc08091e90a (diff) | |
download | dexon-de01178c18766b9f744acc94fe2b96804f998e40.tar dexon-de01178c18766b9f744acc94fe2b96804f998e40.tar.gz dexon-de01178c18766b9f744acc94fe2b96804f998e40.tar.bz2 dexon-de01178c18766b9f744acc94fe2b96804f998e40.tar.lz dexon-de01178c18766b9f744acc94fe2b96804f998e40.tar.xz dexon-de01178c18766b9f744acc94fe2b96804f998e40.tar.zst dexon-de01178c18766b9f744acc94fe2b96804f998e40.zip |
swarm/storage/feed: Renamed package
Diffstat (limited to 'swarm/storage/feed/sign.go')
-rw-r--r-- | swarm/storage/feed/sign.go | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/swarm/storage/feed/sign.go b/swarm/storage/feed/sign.go new file mode 100644 index 000000000..5f0ea0b33 --- /dev/null +++ b/swarm/storage/feed/sign.go @@ -0,0 +1,75 @@ +// Copyright 2018 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package feed + +import ( + "crypto/ecdsa" + + "github.com/ethereum/go-ethereum/common" + "github.com/ethereum/go-ethereum/crypto" +) + +const signatureLength = 65 + +// Signature is an alias for a static byte array with the size of a signature +type Signature [signatureLength]byte + +// Signer signs feed update payloads +type Signer interface { + Sign(common.Hash) (Signature, error) + Address() common.Address +} + +// GenericSigner implements the Signer interface +// It is the vanilla signer that probably should be used in most cases +type GenericSigner struct { + PrivKey *ecdsa.PrivateKey + address common.Address +} + +// NewGenericSigner builds a signer that will sign everything with the provided private key +func NewGenericSigner(privKey *ecdsa.PrivateKey) *GenericSigner { + return &GenericSigner{ + PrivKey: privKey, + address: crypto.PubkeyToAddress(privKey.PublicKey), + } +} + +// Sign signs the supplied data +// It wraps the ethereum crypto.Sign() method +func (s *GenericSigner) Sign(data common.Hash) (signature Signature, err error) { + signaturebytes, err := crypto.Sign(data.Bytes(), s.PrivKey) + if err != nil { + return + } + copy(signature[:], signaturebytes) + return +} + +// Address returns the public key of the signer's private key +func (s *GenericSigner) Address() common.Address { + return s.address +} + +// getUserAddr extracts the address of the feed update signer +func getUserAddr(digest common.Hash, signature Signature) (common.Address, error) { + pub, err := crypto.SigToPub(digest.Bytes(), signature[:]) + if err != nil { + return common.Address{}, err + } + return crypto.PubkeyToAddress(*pub), nil +} |