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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
using System;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Pkcs
{
public class RsassaPssParameters
: Asn1Encodable
{
private AlgorithmIdentifier hashAlgorithm;
private AlgorithmIdentifier maskGenAlgorithm;
private DerInteger saltLength;
private DerInteger trailerField;
public readonly static AlgorithmIdentifier DefaultHashAlgorithm = new AlgorithmIdentifier(OiwObjectIdentifiers.IdSha1, DerNull.Instance);
public readonly static AlgorithmIdentifier DefaultMaskGenFunction = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, DefaultHashAlgorithm);
public readonly static DerInteger DefaultSaltLength = new DerInteger(20);
public readonly static DerInteger DefaultTrailerField = new DerInteger(1);
public static RsassaPssParameters GetInstance(
object obj)
{
if (obj == null || obj is RsassaPssParameters)
{
return (RsassaPssParameters)obj;
}
if (obj is Asn1Sequence)
{
return new RsassaPssParameters((Asn1Sequence)obj);
}
throw new ArgumentException("Unknown object in factory: " + Platform.GetTypeName(obj), "obj");
}
/**
* The default version
*/
public RsassaPssParameters()
{
hashAlgorithm = DefaultHashAlgorithm;
maskGenAlgorithm = DefaultMaskGenFunction;
saltLength = DefaultSaltLength;
trailerField = DefaultTrailerField;
}
public RsassaPssParameters(
AlgorithmIdentifier hashAlgorithm,
AlgorithmIdentifier maskGenAlgorithm,
DerInteger saltLength,
DerInteger trailerField)
{
this.hashAlgorithm = hashAlgorithm;
this.maskGenAlgorithm = maskGenAlgorithm;
this.saltLength = saltLength;
this.trailerField = trailerField;
}
public RsassaPssParameters(
Asn1Sequence seq)
{
hashAlgorithm = DefaultHashAlgorithm;
maskGenAlgorithm = DefaultMaskGenFunction;
saltLength = DefaultSaltLength;
trailerField = DefaultTrailerField;
for (int i = 0; i != seq.Count; i++)
{
Asn1TaggedObject o = (Asn1TaggedObject)seq[i];
switch (o.TagNo)
{
case 0:
hashAlgorithm = AlgorithmIdentifier.GetInstance(o, true);
break;
case 1:
maskGenAlgorithm = AlgorithmIdentifier.GetInstance(o, true);
break;
case 2:
saltLength = DerInteger.GetInstance(o, true);
break;
case 3:
trailerField = DerInteger.GetInstance(o, true);
break;
default:
throw new ArgumentException("unknown tag");
}
}
}
public AlgorithmIdentifier HashAlgorithm
{
get { return hashAlgorithm; }
}
public AlgorithmIdentifier MaskGenAlgorithm
{
get { return maskGenAlgorithm; }
}
public DerInteger SaltLength
{
get { return saltLength; }
}
public DerInteger TrailerField
{
get { return trailerField; }
}
/**
* <pre>
* RSASSA-PSS-params ::= SEQUENCE {
* hashAlgorithm [0] OAEP-PSSDigestAlgorithms DEFAULT sha1,
* maskGenAlgorithm [1] PKCS1MGFAlgorithms DEFAULT mgf1SHA1,
* saltLength [2] INTEGER DEFAULT 20,
* trailerField [3] TrailerField DEFAULT trailerFieldBC
* }
*
* OAEP-PSSDigestAlgorithms ALGORITHM-IDENTIFIER ::= {
* { OID id-sha1 PARAMETERS NULL }|
* { OID id-sha256 PARAMETERS NULL }|
* { OID id-sha384 PARAMETERS NULL }|
* { OID id-sha512 PARAMETERS NULL },
* ... -- Allows for future expansion --
* }
*
* PKCS1MGFAlgorithms ALGORITHM-IDENTIFIER ::= {
* { OID id-mgf1 PARAMETERS OAEP-PSSDigestAlgorithms },
* ... -- Allows for future expansion --
* }
*
* TrailerField ::= INTEGER { trailerFieldBC(1) }
* </pre>
* @return the asn1 primitive representing the parameters.
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector();
if (!hashAlgorithm.Equals(DefaultHashAlgorithm))
{
v.Add(new DerTaggedObject(true, 0, hashAlgorithm));
}
if (!maskGenAlgorithm.Equals(DefaultMaskGenFunction))
{
v.Add(new DerTaggedObject(true, 1, maskGenAlgorithm));
}
if (!saltLength.Equals(DefaultSaltLength))
{
v.Add(new DerTaggedObject(true, 2, saltLength));
}
if (!trailerField.Equals(DefaultTrailerField))
{
v.Add(new DerTaggedObject(true, 3, trailerField));
}
return new DerSequence(v);
}
}
}
|
