github.com/annchain/OG@v0.0.9/deprecated/ogcrypto/randentropy/rand_entropy.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  
     3  // This file is part of the go-ethereum library.
     4  //
     5  // The go-ethereum library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Lesser 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-ethereum 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 Lesser General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public License
    16  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package randentropy
    19  
    20  import (
    21  	crand "crypto/rand"
    22  	"io"
    23  )
    24  
    25  var Reader io.Reader = &randEntropy{}
    26  
    27  type randEntropy struct {
    28  }
    29  
    30  func (*randEntropy) Read(bytes []byte) (n int, err error) {
    31  	readBytes := GetEntropyCSPRNG(len(bytes))
    32  	copy(bytes, readBytes)
    33  	return len(bytes), nil
    34  }
    35  
    36  func GetEntropyCSPRNG(n int) []byte {
    37  	mainBuff := make([]byte, n)
    38  	_, err := io.ReadFull(crand.Reader, mainBuff)
    39  	if err != nil {
    40  		panic("reading from ogcrypto/rand failed: " + err.Error())
    41  	}
    42  	return mainBuff
    43  }