1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
// Copyright 2016, 2017 Thales e-Security, Inc
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package crypto11
import (
"io"
)
// NewRandomReader returns a reader for the random number generator on the token.
func (c *Context) NewRandomReader() (io.Reader, error) {
if c.closed.Get() {
return nil, errClosed
}
return pkcs11RandReader{c}, nil
}
// pkcs11RandReader is a random number reader that uses PKCS#11.
type pkcs11RandReader struct {
context *Context
}
// This implements the Reader interface for pkcs11RandReader.
func (r pkcs11RandReader) Read(data []byte) (n int, err error) {
var result []byte
if err = r.context.withSession(func(session *pkcs11Session) error {
result, err = r.context.ctx.GenerateRandom(session.handle, len(data))
return err
}); err != nil {
return 0, err
}
copy(data, result)
return len(result), err
}
|
