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package org.spongycastle.cms;
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;
/**
* Default authenticated attributes generator.
*/
public class DefaultAuthenticatedAttributeTableGenerator
implements CMSAttributeTableGenerator
{
private final Hashtable table;
/**
* Initialise to use all defaults
*/
public DefaultAuthenticatedAttributeTableGenerator()
{
table = new Hashtable();
}
/**
* Initialise with some extra attributes or overrides.
*
* @param attributeTable initial attribute table to use.
*/
public DefaultAuthenticatedAttributeTableGenerator(
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 and messageDigest. If the constructor
* using an AttributeTable was used, entries in it for contentType 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 = (Hashtable)table.clone();
if (!std.containsKey(CMSAttributes.contentType))
{
ASN1ObjectIdentifier contentType = ASN1ObjectIdentifier.getInstance(
parameters.get(CMSAttributeTableGenerator.CONTENT_TYPE));
Attribute attr = new Attribute(CMSAttributes.contentType,
new DERSet(contentType));
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));
}
}
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