/
utils.go
47 lines (40 loc) · 1.31 KB
/
utils.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package utils
import (
"crypto/ecdsa"
"math/big"
"regexp"
"github.com/ethereum/go-ethereum/common/math"
)
// ZeroKey removes the key from memory
func ZeroKey(k *ecdsa.PrivateKey) {
b := k.D.Bits()
for i := range b {
b[i] = 0
}
}
// ValidNumber returns a valid positive integer
func ValidNumber(input string) *big.Int {
if input == "" {
return big.NewInt(0)
}
matched, err := regexp.MatchString("([0-9])", input)
if !matched || err != nil {
return nil
}
amount := math.MustParseBig256(input)
return amount.Abs(amount)
}