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Check file size before reading it into memory

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This commit is contained in:
Adam Schmideg 2020-03-03 10:34:52 +01:00
parent 745f0fd521
commit ae3c77b82b
1 changed files with 9 additions and 3 deletions
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12
crypto/crypto.go
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@ -25,6 +25,7 @@ import (
"fmt"
"io/ioutil"
"math/big"
"os"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
@ -164,12 +165,17 @@ func HexToECDSA(hexkey string) (*ecdsa.PrivateKey, error) {
// LoadECDSA loads a secp256k1 private key from the given file.
func LoadECDSA(file string) (*ecdsa.PrivateKey, error) {
buf, err := ioutil.ReadFile(file)
stat, err := os.Stat(file)
if err != nil {
return nil, err
}
if len(buf) != 64 {
return nil, fmt.Errorf("expected 64 hexa characters, got %v", len(buf))
size := stat.Size()
if size != 64 {
return nil, fmt.Errorf("expected 64 hexa characters, got %v", size)
}
buf, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
key, err := hex.DecodeString(string(buf))