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decode.go
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decode.go
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package codec
import (
"encoding/asn1"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"github.com/btcsuite/btcd/btcec"
)
func PEMToECPrivKey(data []byte) (*btcec.PrivateKey, error) {
var block *pem.Block
remainder := data
for {
block, remainder = pem.Decode(remainder)
if block == nil {
message := "Cannot find label \"EC PRIVATE KEY\" in PEM data"
return nil, errors.New(message)
}
if block.Type == "EC PRIVATE KEY" {
break
}
}
var object ECPrivKey
_, err := asn1.Unmarshal(block.Bytes, &object)
if err != nil {
return nil, err
}
if !IsSecp256k1(object.NamedCurveOID) {
message := fmt.Sprintf(
"Invalid curve type: %v",
object.NamedCurveOID,
)
return nil, errors.New(message)
}
privKey, _ := btcec.PrivKeyFromBytes(btcec.S256(), object.PrivateKey)
return privKey, nil
}
func LoadECPrivKey(identityFile string) (*btcec.PrivateKey, error) {
contents, err := ioutil.ReadFile(identityFile)
if err != nil {
return nil, err
}
privKey, err := PEMToECPrivKey(contents)
if err != nil {
return nil, err
}
return privKey, nil
}