blob: a87bf1567bd0421420ac7a470b511d51476ffac2 (
plain) (
blame)
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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
using System;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Crypto.Prng
{
public class X931SecureRandom
: SecureRandom
{
private readonly bool mPredictionResistant;
private readonly SecureRandom mRandomSource;
private readonly X931Rng mDrbg;
internal X931SecureRandom(SecureRandom randomSource, X931Rng drbg, bool predictionResistant)
: base((IRandomGenerator)null)
{
this.mRandomSource = randomSource;
this.mDrbg = drbg;
this.mPredictionResistant = predictionResistant;
}
public override void SetSeed(byte[] seed)
{
lock (this)
{
if (mRandomSource != null)
{
this.mRandomSource.SetSeed(seed);
}
}
}
public override void SetSeed(long seed)
{
lock (this)
{
// this will happen when SecureRandom() is created
if (mRandomSource != null)
{
this.mRandomSource.SetSeed(seed);
}
}
}
public override void NextBytes(byte[] bytes)
{
lock (this)
{
// check if a reseed is required...
if (mDrbg.Generate(bytes, mPredictionResistant) < 0)
{
mDrbg.Reseed();
mDrbg.Generate(bytes, mPredictionResistant);
}
}
}
public override void NextBytes(byte[] buf, int off, int len)
{
byte[] bytes = new byte[len];
NextBytes(bytes);
Array.Copy(bytes, 0, buf, off, len);
}
public override byte[] GenerateSeed(int numBytes)
{
byte[] bytes = new byte[numBytes];
NextBytes(bytes);
return bytes;
}
}
}
|