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Diffstat (limited to 'common/csrand/csrand.go')
-rw-r--r-- | common/csrand/csrand.go | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/common/csrand/csrand.go b/common/csrand/csrand.go deleted file mode 100644 index 45849d3..0000000 --- a/common/csrand/csrand.go +++ /dev/null @@ -1,101 +0,0 @@ -/* - * Copyright (c) 2014, Yawning Angel <yawning at torproject dot org> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * * Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * - * * Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ - -// Package csrand implements the math/rand interface over crypto/rand, along -// with some utility functions for common random number/byte related tasks. -// -// Not all of the convinience routines are replicated, only those that are -// immediately useful. The Rand variable provides access to the full math/rand -// API. -package csrand - -import ( - cryptRand "crypto/rand" - "encoding/binary" - "fmt" - "io" - "math/rand" -) - -var ( - csRandSourceInstance csRandSource - - // Rand is a math/rand instance backed by crypto/rand CSPRNG. - Rand = rand.New(csRandSourceInstance) -) - -type csRandSource struct { - // This does not keep any state as it is backed by crypto/rand. -} - -func (r csRandSource) Int63() int64 { - var src [8]byte - if err := Bytes(src[:]); err != nil { - panic(err) - } - val := binary.BigEndian.Uint64(src[:]) - val &= (1<<63 - 1) - - return int64(val) -} - -func (r csRandSource) Seed(seed int64) { - // No-op. -} - -// Intn returns, as a int, a pseudo random number in [0, n). -func Intn(n int) int { - return Rand.Intn(n) -} - -// Float64 returns, as a float64, a pesudo random number in [0.0,1.0). -func Float64() float64 { - return Rand.Float64() -} - -// IntRange returns a uniformly distributed int [min, max]. -func IntRange(min, max int) int { - if max < min { - panic(fmt.Sprintf("IntRange: min > max (%d, %d)", min, max)) - } - - r := (max + 1) - min - ret := Rand.Intn(r) - return ret + min -} - -// Bytes fills the slice with random data. -func Bytes(buf []byte) error { - if _, err := io.ReadFull(cryptRand.Reader, buf); err != nil { - return err - } - - return nil -} - -// Reader is a alias of rand.Reader. -var Reader = cryptRand.Reader |