github.com/igggame/nebulas-go@v2.1.0+incompatible/crypto/utils/utils.go (about)

     1  // Copyright (C) 2017 go-nebulas authors
     2  //
     3  // This file is part of the go-nebulas library.
     4  //
     5  // the go-nebulas library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // the go-nebulas library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13  // GNU General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU General Public License
    16  // along with the go-nebulas library.  If not, see <http://www.gnu.org/licenses/>.
    17  //
    18  
    19  package utils
    20  
    21  import (
    22  	"crypto/rand"
    23  	"io"
    24  )
    25  
    26  // RandomCSPRNG a cryptographically secure pseudo-random number generator
    27  func RandomCSPRNG(n int) []byte {
    28  	buff := make([]byte, n)
    29  	_, err := io.ReadFull(rand.Reader, buff)
    30  	if err != nil {
    31  		panic("reading from crypto/rand failed: " + err.Error())
    32  	}
    33  	return buff
    34  }
    35  
    36  // ZeroBytes clears byte slice.
    37  func ZeroBytes(bytes []byte) {
    38  	for i := range bytes {
    39  		bytes[i] = 0
    40  	}
    41  }