/
secp256k1.go
127 lines (102 loc) · 3.52 KB
/
secp256k1.go
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package crypto
import (
"fmt"
"io"
pb "github.com/libp2p/go-libp2p/core/crypto/pb"
"github.com/libp2p/go-libp2p/core/internal/catch"
"github.com/decred/dcrd/dcrec/secp256k1/v4"
"github.com/decred/dcrd/dcrec/secp256k1/v4/ecdsa"
"github.com/minio/sha256-simd"
)
// Secp256k1PrivateKey is an Secp256k1 private key
type Secp256k1PrivateKey secp256k1.PrivateKey
// Secp256k1PublicKey is an Secp256k1 public key
type Secp256k1PublicKey secp256k1.PublicKey
// GenerateSecp256k1Key generates a new Secp256k1 private and public key pair
func GenerateSecp256k1Key(src io.Reader) (PrivKey, PubKey, error) {
privk, err := secp256k1.GeneratePrivateKey()
if err != nil {
return nil, nil, err
}
k := (*Secp256k1PrivateKey)(privk)
return k, k.GetPublic(), nil
}
// UnmarshalSecp256k1PrivateKey returns a private key from bytes
func UnmarshalSecp256k1PrivateKey(data []byte) (k PrivKey, err error) {
if len(data) != secp256k1.PrivKeyBytesLen {
return nil, fmt.Errorf("expected secp256k1 data size to be %d", secp256k1.PrivKeyBytesLen)
}
defer func() { catch.HandlePanic(recover(), &err, "secp256k1 private-key unmarshal") }()
privk := secp256k1.PrivKeyFromBytes(data)
return (*Secp256k1PrivateKey)(privk), nil
}
// UnmarshalSecp256k1PublicKey returns a public key from bytes
func UnmarshalSecp256k1PublicKey(data []byte) (_k PubKey, err error) {
defer func() { catch.HandlePanic(recover(), &err, "secp256k1 public-key unmarshal") }()
k, err := secp256k1.ParsePubKey(data)
if err != nil {
return nil, err
}
return (*Secp256k1PublicKey)(k), nil
}
// Type returns the private key type
func (k *Secp256k1PrivateKey) Type() pb.KeyType {
return pb.KeyType_Secp256k1
}
// Raw returns the bytes of the key
func (k *Secp256k1PrivateKey) Raw() ([]byte, error) {
return (*secp256k1.PrivateKey)(k).Serialize(), nil
}
// Equals compares two private keys
func (k *Secp256k1PrivateKey) Equals(o Key) bool {
sk, ok := o.(*Secp256k1PrivateKey)
if !ok {
return basicEquals(k, o)
}
return k.GetPublic().Equals(sk.GetPublic())
}
// Sign returns a signature from input data
func (k *Secp256k1PrivateKey) Sign(data []byte) (_sig []byte, err error) {
defer func() { catch.HandlePanic(recover(), &err, "secp256k1 signing") }()
key := (*secp256k1.PrivateKey)(k)
hash := sha256.Sum256(data)
sig := ecdsa.Sign(key, hash[:])
return sig.Serialize(), nil
}
// GetPublic returns a public key
func (k *Secp256k1PrivateKey) GetPublic() PubKey {
return (*Secp256k1PublicKey)((*secp256k1.PrivateKey)(k).PubKey())
}
// Type returns the public key type
func (k *Secp256k1PublicKey) Type() pb.KeyType {
return pb.KeyType_Secp256k1
}
// Raw returns the bytes of the key
func (k *Secp256k1PublicKey) Raw() (res []byte, err error) {
defer func() { catch.HandlePanic(recover(), &err, "secp256k1 public key marshaling") }()
return (*secp256k1.PublicKey)(k).SerializeCompressed(), nil
}
// Equals compares two public keys
func (k *Secp256k1PublicKey) Equals(o Key) bool {
sk, ok := o.(*Secp256k1PublicKey)
if !ok {
return basicEquals(k, o)
}
return (*secp256k1.PublicKey)(k).IsEqual((*secp256k1.PublicKey)(sk))
}
// Verify compares a signature against the input data
func (k *Secp256k1PublicKey) Verify(data []byte, sigStr []byte) (success bool, err error) {
defer func() {
catch.HandlePanic(recover(), &err, "secp256k1 signature verification")
// To be extra safe.
if err != nil {
success = false
}
}()
sig, err := ecdsa.ParseDERSignature(sigStr)
if err != nil {
return false, err
}
hash := sha256.Sum256(data)
return sig.Verify(hash[:], (*secp256k1.PublicKey)(k)), nil
}