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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Pkcs
{
public class Pbkdf2Params
: Asn1Encodable
{
private static AlgorithmIdentifier algid_hmacWithSHA1 = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdHmacWithSha1, DerNull.Instance);
private readonly Asn1OctetString octStr;
private readonly DerInteger iterationCount, keyLength;
private readonly AlgorithmIdentifier prf;
public static Pbkdf2Params GetInstance(
object obj)
{
if (obj == null || obj is Pbkdf2Params)
return (Pbkdf2Params)obj;
if (obj is Asn1Sequence)
return new Pbkdf2Params((Asn1Sequence)obj);
throw new ArgumentException("Unknown object in factory: " + Platform.GetTypeName(obj), "obj");
}
public Pbkdf2Params(
Asn1Sequence seq)
{
if (seq.Count < 2 || seq.Count > 4)
throw new ArgumentException("Wrong number of elements in sequence", "seq");
this.octStr = (Asn1OctetString)seq[0];
this.iterationCount = (DerInteger)seq[1];
Asn1Encodable kl = null, d = null;
if (seq.Count > 3)
{
kl = seq[2];
d = seq[3];
}
else if (seq.Count > 2)
{
if (seq[2] is DerInteger)
{
kl = seq[2];
}
else
{
d = seq[2];
}
}
if (kl != null)
{
keyLength = (DerInteger)kl;
}
if (d != null)
{
prf = AlgorithmIdentifier.GetInstance(d);
}
}
public Pbkdf2Params(
byte[] salt,
int iterationCount)
{
this.octStr = new DerOctetString(salt);
this.iterationCount = new DerInteger(iterationCount);
}
public Pbkdf2Params(
byte[] salt,
int iterationCount,
int keyLength)
: this(salt, iterationCount)
{
this.keyLength = new DerInteger(keyLength);
}
public Pbkdf2Params(
byte[] salt,
int iterationCount,
int keyLength,
AlgorithmIdentifier prf)
: this(salt, iterationCount, keyLength)
{
this.prf = prf;
}
public Pbkdf2Params(
byte[] salt,
int iterationCount,
AlgorithmIdentifier prf)
: this(salt, iterationCount)
{
this.prf = prf;
}
public byte[] GetSalt()
{
return octStr.GetOctets();
}
public BigInteger IterationCount
{
get { return iterationCount.Value; }
}
public BigInteger KeyLength
{
get { return keyLength == null ? null : keyLength.Value; }
}
public bool IsDefaultPrf
{
get { return prf == null || prf.Equals(algid_hmacWithSHA1); }
}
public AlgorithmIdentifier Prf
{
get { return prf != null ? prf : algid_hmacWithSHA1; }
}
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(
octStr, iterationCount);
if (keyLength != null)
{
v.Add(keyLength);
}
if (!IsDefaultPrf)
{
v.Add(prf);
}
return new DerSequence(v);
}
}
}
|
