105 lines
2.5 KiB
C#
105 lines
2.5 KiB
C#
using System;
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using System.Collections;
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using Org.BouncyCastle.Asn1;
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using Org.BouncyCastle.Asn1.Cms;
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namespace Org.BouncyCastle.Cms
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{
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/**
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* Default signed attributes generator.
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*/
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public class DefaultSignedAttributeTableGenerator
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: CmsAttributeTableGenerator
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{
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private readonly Hashtable table;
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/**
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* Initialise to use all defaults
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*/
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public DefaultSignedAttributeTableGenerator()
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{
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table = new Hashtable();
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}
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/**
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* Initialise with some extra attributes or overrides.
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*
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* @param attributeTable initial attribute table to use.
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*/
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public DefaultSignedAttributeTableGenerator(
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AttributeTable attributeTable)
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{
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if (attributeTable != null)
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{
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table = attributeTable.ToHashtable();
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}
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else
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{
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table = new Hashtable();
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}
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}
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/**
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* Create a standard attribute table from the passed in parameters - this will
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* normally include contentType, signingTime, and messageDigest. If the constructor
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* using an AttributeTable was used, entries in it for contentType, signingTime, and
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* messageDigest will override the generated ones.
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*
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* @param parameters source parameters for table generation.
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*
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* @return a filled in Hashtable of attributes.
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*/
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protected virtual Hashtable createStandardAttributeTable(
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IDictionary parameters)
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{
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Hashtable std = (Hashtable)table.Clone();
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if (!std.ContainsKey(CmsAttributes.ContentType))
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{
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Asn1.Cms.Attribute attr = new Asn1.Cms.Attribute(CmsAttributes.ContentType,
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new DerSet((DerObjectIdentifier)parameters[CmsAttributeTableParameter.ContentType]));
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std[attr.AttrType] = attr;
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}
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if (!std.ContainsKey(CmsAttributes.SigningTime))
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{
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Asn1.Cms.Attribute attr = new Asn1.Cms.Attribute(
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CmsAttributes.SigningTime, new DerSet(new Time(DateTime.UtcNow)));
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std[attr.AttrType] = attr;
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}
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if (!std.ContainsKey(CmsAttributes.MessageDigest))
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{
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byte[] hash = (byte[])parameters[CmsAttributeTableParameter.Digest];
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Asn1.Cms.Attribute attr;
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if (hash != null)
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{
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attr = new Asn1.Cms.Attribute(
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CmsAttributes.MessageDigest, new DerSet(new DerOctetString(hash)));
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}
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else
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{
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attr = new Asn1.Cms.Attribute(
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CmsAttributes.MessageDigest, new DerSet(DerNull.Instance));
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}
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std[attr.AttrType] = attr;
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}
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return std;
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}
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/**
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* @param parameters source parameters
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* @return the populated attribute table
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*/
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public virtual AttributeTable GetAttributes(
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IDictionary parameters)
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{
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return new AttributeTable(createStandardAttributeTable(parameters));
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}
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}
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}
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