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 }