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signer.go
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signer.go
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package ecc
import (
"bytes"
"crypto/ecdsa"
"crypto/rand"
"github.com/dobyte/due/crypto"
)
type Signer struct {
err error
opts *signerOptions
privateKey *ecdsa.PrivateKey
}
var _ crypto.Signer = &Signer{}
func init() {
crypto.RegisterSigner(NewSigner())
}
func NewSigner(opts ...SignerOption) *Signer {
o := defaultSignerOptions()
for _, opt := range opts {
opt(o)
}
d := &Signer{opts: o}
d.privateKey, d.err = parseECDSAPrivateKey(d.opts.privateKey)
return d
}
// Name 名称
func (s *Signer) Name() string {
return Name
}
// Sign 签名
func (s *Signer) Sign(data []byte) ([]byte, error) {
if s.err != nil {
return nil, s.err
}
hashed := s.opts.hash.Sum(data)
rs, ss, err := ecdsa.Sign(rand.Reader, s.privateKey, hashed[:])
if err != nil {
return nil, err
}
rt, err := rs.MarshalText()
if err != nil {
return nil, err
}
st, err := ss.MarshalText()
if err != nil {
return nil, err
}
delimiter := []byte(s.opts.delimiter)
buffer := &bytes.Buffer{}
buffer.Grow(len(rt) + len(st) + len(delimiter))
buffer.Write(rt)
buffer.Write(delimiter)
buffer.Write(st)
return buffer.Bytes(), nil
}