accounts/keystore, crypto: enforce 256 bit keys on import

internal/ethapi/api.go

@@ -19,7 +19,6 @@ package ethapi
 import (
 	"bytes"
 	"context"
-	"encoding/hex"
 	"errors"
 	"fmt"
 	"math/big"
@@ -283,12 +282,11 @@ func fetchKeystore(am *accounts.Manager) *keystore.KeyStore {
 // ImportRawKey stores the given hex encoded ECDSA key into the key directory,
 // encrypting it with the passphrase.
 func (s *PrivateAccountAPI) ImportRawKey(privkey string, password string) (common.Address, error) {
-	hexkey, err := hex.DecodeString(privkey)
+	key, err := crypto.HexToECDSA(privkey)
 	if err != nil {
 		return common.Address{}, err
 	}
-
-	acc, err := fetchKeystore(s.am).ImportECDSA(crypto.ToECDSA(hexkey), password)
+	acc, err := fetchKeystore(s.am).ImportECDSA(key, password)
 	return acc.Address, err
 }