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Side by Side Diff: src/pkg/crypto/rand/rand_unix.go

Issue 4357052: code review 4357052: os: New Open API. (Closed)
Patch Set: diff -r dc1d5042801a https://go.googlecode.com/hg/ Created 12 years, 12 months ago
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1 // Copyright 2010 The Go Authors. All rights reserved. 1 // Copyright 2010 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style 2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file. 3 // license that can be found in the LICENSE file.
4 4
5 // Unix cryptographically secure pseudorandom number 5 // Unix cryptographically secure pseudorandom number
6 // generator. 6 // generator.
7 7
8 package rand 8 package rand
9 9
10 import ( 10 import (
(...skipping 14 matching lines...) Expand all
25 type devReader struct { 25 type devReader struct {
26 name string 26 name string
27 f io.Reader 27 f io.Reader
28 mu sync.Mutex 28 mu sync.Mutex
29 } 29 }
30 30
31 func (r *devReader) Read(b []byte) (n int, err os.Error) { 31 func (r *devReader) Read(b []byte) (n int, err os.Error) {
32 r.mu.Lock() 32 r.mu.Lock()
33 defer r.mu.Unlock() 33 defer r.mu.Unlock()
34 if r.f == nil { 34 if r.f == nil {
35 » » f, err := os.Open(r.name, os.O_RDONLY, 0) 35 » » f, err := os.Open(r.name)
36 if f == nil { 36 if f == nil {
37 return 0, err 37 return 0, err
38 } 38 }
39 r.f = bufio.NewReader(f) 39 r.f = bufio.NewReader(f)
40 } 40 }
41 return r.f.Read(b) 41 return r.f.Read(b)
42 } 42 }
43 43
44 // Alternate pseudo-random implementation for use on 44 // Alternate pseudo-random implementation for use on
45 // systems without a reliable /dev/urandom. So far we 45 // systems without a reliable /dev/urandom. So far we
(...skipping 70 matching lines...) Expand 10 before | Expand all | Expand 10 after
116 r.seed[i] = r.time[i] ^ r.dst[i] 116 r.seed[i] = r.time[i] ^ r.dst[i]
117 } 117 }
118 r.cipher.Encrypt(r.seed[0:], r.seed[0:]) 118 r.cipher.Encrypt(r.seed[0:], r.seed[0:])
119 119
120 m := copy(b, r.dst[0:]) 120 m := copy(b, r.dst[0:])
121 b = b[m:] 121 b = b[m:]
122 } 122 }
123 123
124 return n, nil 124 return n, nil
125 } 125 }
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