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73 lines
2.2 KiB
73 lines
2.2 KiB
9 years ago
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// Copyright (c) 2013-2014 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package btcec
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import (
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"crypto/ecdsa"
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"crypto/rand"
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"math/big"
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)
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// PrivateKey wraps an ecdsa.PrivateKey as a convenience mainly for signing
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// things with the the private key without having to directly import the ecdsa
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// package.
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type PrivateKey ecdsa.PrivateKey
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// PrivKeyFromBytes returns a private and public key for `curve' based on the
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// private key passed as an argument as a byte slice.
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func PrivKeyFromBytes(curve *KoblitzCurve, pk []byte) (*PrivateKey,
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*PublicKey) {
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x, y := curve.ScalarBaseMult(pk)
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priv := &ecdsa.PrivateKey{
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PublicKey: ecdsa.PublicKey{
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Curve: curve,
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X: x,
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Y: y,
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},
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D: new(big.Int).SetBytes(pk),
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}
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return (*PrivateKey)(priv), (*PublicKey)(&priv.PublicKey)
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}
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// NewPrivateKey is a wrapper for ecdsa.GenerateKey that returns a PrivateKey
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// instead of the normal ecdsa.PrivateKey.
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func NewPrivateKey(curve *KoblitzCurve) (*PrivateKey, error) {
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key, err := ecdsa.GenerateKey(curve, rand.Reader)
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if err != nil {
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return nil, err
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}
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return (*PrivateKey)(key), nil
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}
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// PubKey returns the PublicKey corresponding to this private key.
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func (p *PrivateKey) PubKey() *PublicKey {
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return (*PublicKey)(&p.PublicKey)
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}
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// ToECDSA returns the private key as a *ecdsa.PrivateKey.
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func (p *PrivateKey) ToECDSA() *ecdsa.PrivateKey {
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return (*ecdsa.PrivateKey)(p)
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}
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// Sign generates an ECDSA signature for the provided hash (which should be the result
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// of hashing a larger message) using the private key. Produced signature
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// is deterministic (same message and same key yield the same signature) and canonical
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// in accordance with RFC6979 and BIP0062.
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func (p *PrivateKey) Sign(hash []byte) (*Signature, error) {
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return signRFC6979(p, hash)
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}
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// PrivKeyBytesLen defines the length in bytes of a serialized private key.
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const PrivKeyBytesLen = 32
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// Serialize returns the private key number d as a big-endian binary-encoded
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// number, padded to a length of 32 bytes.
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func (p *PrivateKey) Serialize() []byte {
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b := make([]byte, 0, PrivKeyBytesLen)
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return paddedAppend(PrivKeyBytesLen, b, p.ToECDSA().D.Bytes())
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}
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