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
|
package org.spongycastle.cms;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Map;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.DERSet;
import org.spongycastle.asn1.cms.Attribute;
import org.spongycastle.asn1.cms.AttributeTable;
import org.spongycastle.asn1.cms.CMSAttributes;
import org.spongycastle.asn1.cms.Time;
/**
* Default signed attributes generator.
*/
public class DefaultSignedAttributeTableGenerator
implements CMSAttributeTableGenerator
{
private final Hashtable table;
/**
* Initialise to use all defaults
*/
public DefaultSignedAttributeTableGenerator()
{
table = new Hashtable();
}
/**
* Initialise with some extra attributes or overrides.
*
* @param attributeTable initial attribute table to use.
*/
public DefaultSignedAttributeTableGenerator(
AttributeTable attributeTable)
{
if (attributeTable != null)
{
table = attributeTable.toHashtable();
}
else
{
table = new Hashtable();
}
}
/**
* Create a standard attribute table from the passed in parameters - this will
* normally include contentType, signingTime, and messageDigest. If the constructor
* using an AttributeTable was used, entries in it for contentType, signingTime, and
* messageDigest will override the generated ones.
*
* @param parameters source parameters for table generation.
*
* @return a filled in Hashtable of attributes.
*/
protected Hashtable createStandardAttributeTable(
Map parameters)
{
Hashtable std = copyHashTable(table);
if (!std.containsKey(CMSAttributes.contentType))
{
ASN1ObjectIdentifier contentType = ASN1ObjectIdentifier.getInstance(
parameters.get(CMSAttributeTableGenerator.CONTENT_TYPE));
// contentType will be null if we're trying to generate a counter signature.
if (contentType != null)
{
Attribute attr = new Attribute(CMSAttributes.contentType,
new DERSet(contentType));
std.put(attr.getAttrType(), attr);
}
}
if (!std.containsKey(CMSAttributes.signingTime))
{
Date signingTime = new Date();
Attribute attr = new Attribute(CMSAttributes.signingTime,
new DERSet(new Time(signingTime)));
std.put(attr.getAttrType(), attr);
}
if (!std.containsKey(CMSAttributes.messageDigest))
{
byte[] messageDigest = (byte[])parameters.get(
CMSAttributeTableGenerator.DIGEST);
Attribute attr = new Attribute(CMSAttributes.messageDigest,
new DERSet(new DEROctetString(messageDigest)));
std.put(attr.getAttrType(), attr);
}
return std;
}
/**
* @param parameters source parameters
* @return the populated attribute table
*/
public AttributeTable getAttributes(Map parameters)
{
return new AttributeTable(createStandardAttributeTable(parameters));
}
private static Hashtable copyHashTable(Hashtable paramsMap)
{
Hashtable newTable = new Hashtable();
Enumeration keys = paramsMap.keys();
while (keys.hasMoreElements())
{
Object key = keys.nextElement();
newTable.put(key, paramsMap.get(key));
}
return newTable;
}
}
|
