summary refs log tree commit diff
path: root/crypto/src/cms/CMSAuthenticatedData.cs
blob: 5e234da2bb205cd972b0931da2cfe06b4a523eb8 (plain) (blame)
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
using System;
using System.Collections;
using System.IO;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Cms
{
	/**
	* containing class for an CMS Authenticated Data object
	*/
	public class CmsAuthenticatedData
	{
		internal RecipientInformationStore recipientInfoStore;
		internal ContentInfo contentInfo;

		private AlgorithmIdentifier macAlg;
		private Asn1Set authAttrs;
		private Asn1Set unauthAttrs;
		private byte[] mac;

		public CmsAuthenticatedData(
			byte[] authData)
			: this(CmsUtilities.ReadContentInfo(authData))
		{
		}

		public CmsAuthenticatedData(
			Stream authData)
			: this(CmsUtilities.ReadContentInfo(authData))
		{
		}

		public CmsAuthenticatedData(
			ContentInfo contentInfo)
		{
			this.contentInfo = contentInfo;

			AuthenticatedData authData = AuthenticatedData.GetInstance(contentInfo.Content);

			//
			// read the recipients
			//
			Asn1Set recipientInfos = authData.RecipientInfos;

			this.macAlg = authData.MacAlgorithm;

			//
			// read the authenticated content info
			//
			ContentInfo encInfo = authData.EncapsulatedContentInfo;
			CmsReadable readable = new CmsProcessableByteArray(
				Asn1OctetString.GetInstance(encInfo.Content).GetOctets());
			CmsSecureReadable secureReadable = new CmsEnvelopedHelper.CmsAuthenticatedSecureReadable(
				this.macAlg, readable);

			//
			// build the RecipientInformationStore
			//
			this.recipientInfoStore = CmsEnvelopedHelper.BuildRecipientInformationStore(
				recipientInfos, secureReadable);

			this.authAttrs = authData.AuthAttrs;
			this.mac = authData.Mac.GetOctets();
			this.unauthAttrs = authData.UnauthAttrs;
		}

		public byte[] GetMac()
		{
			return Arrays.Clone(mac);
		}

		public AlgorithmIdentifier MacAlgorithmID
		{
			get { return macAlg; }
		}

		/**
		* return the object identifier for the content MAC algorithm.
		*/
		public string MacAlgOid
		{
			get { return macAlg.ObjectID.Id; }
		}

		/**
		* return a store of the intended recipients for this message
		*/
		public RecipientInformationStore GetRecipientInfos()
		{
			return recipientInfoStore;
		}

		/**
		 * return the ContentInfo 
		 */
		public ContentInfo ContentInfo
		{
			get { return contentInfo; }
		}

		/**
		* return a table of the digested attributes indexed by
		* the OID of the attribute.
		*/
		public Asn1.Cms.AttributeTable GetAuthAttrs()
		{
			if (authAttrs == null)
				return null;

			return new Asn1.Cms.AttributeTable(authAttrs);
		}

		/**
		* return a table of the undigested attributes indexed by
		* the OID of the attribute.
		*/
		public Asn1.Cms.AttributeTable GetUnauthAttrs()
		{
			if (unauthAttrs == null)
				return null;

			return new Asn1.Cms.AttributeTable(unauthAttrs);
		}

		/**
		* return the ASN.1 encoded representation of this object.
		*/
		public byte[] GetEncoded()
		{
			return contentInfo.GetEncoded();
		}
	}
}