KeyAgreeRecipientInfo.cs
4.13 KB
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
using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Cms
{
public class KeyAgreeRecipientInfo
: Asn1Encodable
{
private DerInteger version;
private OriginatorIdentifierOrKey originator;
private Asn1OctetString ukm;
private AlgorithmIdentifier keyEncryptionAlgorithm;
private Asn1Sequence recipientEncryptedKeys;
public KeyAgreeRecipientInfo(
OriginatorIdentifierOrKey originator,
Asn1OctetString ukm,
AlgorithmIdentifier keyEncryptionAlgorithm,
Asn1Sequence recipientEncryptedKeys)
{
this.version = new DerInteger(3);
this.originator = originator;
this.ukm = ukm;
this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
this.recipientEncryptedKeys = recipientEncryptedKeys;
}
public KeyAgreeRecipientInfo(
Asn1Sequence seq)
{
int index = 0;
version = (DerInteger) seq[index++];
originator = OriginatorIdentifierOrKey.GetInstance(
(Asn1TaggedObject) seq[index++], true);
if (seq[index] is Asn1TaggedObject)
{
ukm = Asn1OctetString.GetInstance(
(Asn1TaggedObject) seq[index++], true);
}
keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(
seq[index++]);
recipientEncryptedKeys = (Asn1Sequence) seq[index++];
}
/**
* return a KeyAgreeRecipientInfo object from a tagged object.
*
* @param obj the tagged object holding the object we want.
* @param explicitly true if the object is meant to be explicitly
* tagged false otherwise.
* @exception ArgumentException if the object held by the
* tagged object cannot be converted.
*/
public static KeyAgreeRecipientInfo GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
/**
* return a KeyAgreeRecipientInfo object from the given object.
*
* @param obj the object we want converted.
* @exception ArgumentException if the object cannot be converted.
*/
public static KeyAgreeRecipientInfo GetInstance(
object obj)
{
if (obj == null || obj is KeyAgreeRecipientInfo)
return (KeyAgreeRecipientInfo)obj;
if (obj is Asn1Sequence)
return new KeyAgreeRecipientInfo((Asn1Sequence)obj);
throw new ArgumentException(
"Illegal object in KeyAgreeRecipientInfo: " + Platform.GetTypeName(obj));
}
public DerInteger Version
{
get { return version; }
}
public OriginatorIdentifierOrKey Originator
{
get { return originator; }
}
public Asn1OctetString UserKeyingMaterial
{
get { return ukm; }
}
public AlgorithmIdentifier KeyEncryptionAlgorithm
{
get { return keyEncryptionAlgorithm; }
}
public Asn1Sequence RecipientEncryptedKeys
{
get { return recipientEncryptedKeys; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* KeyAgreeRecipientInfo ::= Sequence {
* version CMSVersion, -- always set to 3
* originator [0] EXPLICIT OriginatorIdentifierOrKey,
* ukm [1] EXPLICIT UserKeyingMaterial OPTIONAL,
* keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
* recipientEncryptedKeys RecipientEncryptedKeys
* }
*
* UserKeyingMaterial ::= OCTET STRING
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(
version, new DerTaggedObject(true, 0, originator));
if (ukm != null)
{
v.Add(new DerTaggedObject(true, 1, ukm));
}
v.Add(keyEncryptionAlgorithm, recipientEncryptedKeys);
return new DerSequence(v);
}
}
}