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
73
74
75
76
77
78
79
|
using System;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Utilities;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Pqc.Crypto.Lms
{
// TODO[api] Make internal
public sealed class SeedDerive
{
private readonly byte[] m_I;
private readonly byte[] m_masterSeed;
private readonly IDigest m_digest;
public SeedDerive(byte[] I, byte[] masterSeed, IDigest digest)
{
m_I = I;
m_masterSeed = masterSeed;
m_digest = digest;
}
public byte[] GetI() => Arrays.Clone(m_I);
public byte[] GetMasterSeed() => Arrays.Clone(m_masterSeed);
public int J { get; set; }
public int Q { get; set; }
public byte[] DeriveSeed(bool incJ, byte[] target, int offset)
{
if (target.Length - offset < m_digest.GetDigestSize())
throw new ArgumentException("target length is less than digest size.", nameof(target));
int q = Q, j = J;
#pragma warning disable CS0618 // Type or member is obsolete
m_digest.BlockUpdate(I, 0, I.Length);
#pragma warning restore CS0618 // Type or member is obsolete
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
Span<byte> qj = stackalloc byte[7];
Pack.UInt32_To_BE((uint)q, qj);
Pack.UInt16_To_BE((ushort)j, qj[4..]);
qj[6] = 0xFF;
m_digest.BlockUpdate(qj);
#else
m_digest.Update((byte)(q >> 24));
m_digest.Update((byte)(q >> 16));
m_digest.Update((byte)(q >> 8));
m_digest.Update((byte)(q));
m_digest.Update((byte)(j >> 8));
m_digest.Update((byte)(j));
m_digest.Update(0xFF);
#endif
#pragma warning disable CS0618 // Type or member is obsolete
m_digest.BlockUpdate(m_masterSeed, 0, m_masterSeed.Length);
#pragma warning restore CS0618 // Type or member is obsolete
m_digest.DoFinal(target, offset); // Digest resets here.
if (incJ)
{
++J;
}
return target;
}
[Obsolete("Use 'GetI' instead")]
public byte[] I => m_I;
[Obsolete("Use 'GetMasterSeed' instead")]
public byte[] MasterSeed => m_masterSeed;
}
}
|
