74 lines
2.2 KiB
Go
74 lines
2.2 KiB
Go
// Copyright (c) 2013-2016 The btcsuite developers
|
|
// Use of this source code is governed by an ISC
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package btcec
|
|
|
|
import (
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
"crypto/rand"
|
|
"math/big"
|
|
)
|
|
|
|
// PrivateKey wraps an ecdsa.PrivateKey as a convenience mainly for signing
|
|
// things with the the private key without having to directly import the ecdsa
|
|
// package.
|
|
type PrivateKey ecdsa.PrivateKey
|
|
|
|
// PrivKeyFromBytes returns a private and public key for `curve' based on the
|
|
// private key passed as an argument as a byte slice.
|
|
func PrivKeyFromBytes(curve elliptic.Curve, pk []byte) (*PrivateKey,
|
|
*PublicKey) {
|
|
x, y := curve.ScalarBaseMult(pk)
|
|
|
|
priv := &ecdsa.PrivateKey{
|
|
PublicKey: ecdsa.PublicKey{
|
|
Curve: curve,
|
|
X: x,
|
|
Y: y,
|
|
},
|
|
D: new(big.Int).SetBytes(pk),
|
|
}
|
|
|
|
return (*PrivateKey)(priv), (*PublicKey)(&priv.PublicKey)
|
|
}
|
|
|
|
// NewPrivateKey is a wrapper for ecdsa.GenerateKey that returns a PrivateKey
|
|
// instead of the normal ecdsa.PrivateKey.
|
|
func NewPrivateKey(curve elliptic.Curve) (*PrivateKey, error) {
|
|
key, err := ecdsa.GenerateKey(curve, rand.Reader)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return (*PrivateKey)(key), nil
|
|
}
|
|
|
|
// PubKey returns the PublicKey corresponding to this private key.
|
|
func (p *PrivateKey) PubKey() *PublicKey {
|
|
return (*PublicKey)(&p.PublicKey)
|
|
}
|
|
|
|
// ToECDSA returns the private key as a *ecdsa.PrivateKey.
|
|
func (p *PrivateKey) ToECDSA() *ecdsa.PrivateKey {
|
|
return (*ecdsa.PrivateKey)(p)
|
|
}
|
|
|
|
// Sign generates an ECDSA signature for the provided hash (which should be the result
|
|
// of hashing a larger message) using the private key. Produced signature
|
|
// is deterministic (same message and same key yield the same signature) and canonical
|
|
// in accordance with RFC6979 and BIP0062.
|
|
func (p *PrivateKey) Sign(hash []byte) (*Signature, error) {
|
|
return signRFC6979(p, hash)
|
|
}
|
|
|
|
// PrivKeyBytesLen defines the length in bytes of a serialized private key.
|
|
const PrivKeyBytesLen = 32
|
|
|
|
// Serialize returns the private key number d as a big-endian binary-encoded
|
|
// number, padded to a length of 32 bytes.
|
|
func (p *PrivateKey) Serialize() []byte {
|
|
b := make([]byte, 0, PrivKeyBytesLen)
|
|
return paddedAppend(PrivKeyBytesLen, b, p.ToECDSA().D.Bytes())
|
|
}
|