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lib/rand/securesource.go
62 строки
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deepsource-autofix[bot]
all: Remove unused method receivers (#8462)
28 июл 2022, 18:32
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28 июл 2022, 18:32
755d219
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// Copyright (C) 2016 The Syncthing Authors. // // This Source Code Form is subject to the terms of the Mozilla Public // License, v. 2.0. If a copy of the MPL was not distributed with this file, // You can obtain one at https://mozilla.org/MPL/2.0/. package rand import ( "bufio" "crypto/rand" "encoding/binary" "io" "sync" ) // The secureSource is a math/rand.Source + io.Reader that reads bytes from // crypto/rand.Reader. It means we can use the convenience functions // provided by math/rand.Rand on top of a secure source of numbers. It is // concurrency safe for ease of use. type secureSource struct { rd io.Reader mut sync.Mutex buf [8]byte } func newSecureSource() *secureSource { return &secureSource{ // Using buffering on top of the rand.Reader increases our // performance by about 20%, even though it means we must use // locking. rd: bufio.NewReader(rand.Reader), } } func (*secureSource) Seed(int64) { panic("SecureSource is not seedable") } func (s *secureSource) Int63() int64 { return int64(s.Uint64() & (1<<63 - 1)) } func (s *secureSource) Read(p []byte) (int, error) { s.mut.Lock() defer s.mut.Unlock() return s.rd.Read(p) } func (s *secureSource) Uint64() uint64 { // Read eight bytes of entropy from the buffered, secure random number // generator. The buffered reader isn't concurrency safe, so we lock // around that. s.mut.Lock() defer s.mut.Unlock() _, err := io.ReadFull(s.rd, s.buf[:]) if err != nil { panic("randomness failure: " + err.Error()) } return binary.LittleEndian.Uint64(s.buf[:]) }