internal KeyTransRecipientInformation(
KeyTransRecipientInfo info,
CmsSecureReadable secureReadable)
: base(info.KeyEncryptionAlgorithm, secureReadable)
{
this.info = info;
this.rid = new RecipientID();
RecipientIdentifier r = info.RecipientIdentifier;
try
{
if (r.IsTagged)
{
Asn1OctetString octs = Asn1OctetString.GetInstance(r.ID);
rid.SubjectKeyIdentifier = octs.GetOctets();
}
else
{
IssuerAndSerialNumber iAnds = IssuerAndSerialNumber.GetInstance(r.ID);
rid.Issuer = iAnds.Name;
rid.SerialNumber = iAnds.SerialNumber.Value;
}
}
catch (IOException)
{
throw new ArgumentException("invalid rid in KeyTransRecipientInformation");
}
}
// private new AlgorithmIdentifier _encAlg;
public KeyTransRecipientInformation(
KeyTransRecipientInfo info,
AlgorithmIdentifier encAlg,
Stream data)
: base(encAlg, AlgorithmIdentifier.GetInstance(info.KeyEncryptionAlgorithm), data)
{
this._info = info;
// this._encAlg = encAlg;
this._rid = new RecipientID();
RecipientIdentifier r = info.RecipientIdentifier;
try
{
if (r.IsTagged)
{
Asn1OctetString octs = Asn1OctetString.GetInstance(r.ID);
_rid.SubjectKeyIdentifier = octs.GetOctets();
}
else
{
IssuerAndSerialNumber iAnds = IssuerAndSerialNumber.GetInstance(r.ID);
_rid.Issuer = iAnds.Name;
_rid.SerialNumber = iAnds.SerialNumber.Value;
}
}
catch (IOException)
{
throw new ArgumentException("invalid rid in KeyTransRecipientInformation");
}
}
public RecipientInfo(
KeyTransRecipientInfo info)
{
this.info = info;
}
public RecipientInfo(
KeyTransRecipientInfo info)
{
this.info = info;
}
private ITestResult EnvelopedTest()
{
try
{
// Key trans
ContentInfo info = ContentInfo.GetInstance(
Asn1Object.FromByteArray(envDataKeyTrns));
EnvelopedData envData = EnvelopedData.GetInstance(info.Content);
Asn1Set s = envData.RecipientInfos;
if (s.Count != 1)
{
return new SimpleTestResult(false, Name + ": CMS KeyTrans enveloped, wrong number of recipients");
}
RecipientInfo recip = RecipientInfo.GetInstance(s[0]);
if (recip.Info is KeyTransRecipientInfo)
{
KeyTransRecipientInfo inf = KeyTransRecipientInfo.GetInstance(recip.Info);
inf = new KeyTransRecipientInfo(inf.RecipientIdentifier, inf.KeyEncryptionAlgorithm, inf.EncryptedKey);
s = new DerSet(new RecipientInfo(inf));
}
else
{
return new SimpleTestResult(false, Name + ": CMS KeyTrans enveloped, wrong recipient type");
}
envData = new EnvelopedData(envData.OriginatorInfo, s, envData.EncryptedContentInfo, envData.UnprotectedAttrs);
info = new ContentInfo(CmsObjectIdentifiers.EnvelopedData, envData);
if (!Arrays.AreEqual(info.GetEncoded(), envDataKeyTrns))
{
return new SimpleTestResult(false, Name + ": CMS KeyTrans enveloped failed to re-encode");
}
// KEK
info = ContentInfo.GetInstance(
Asn1Object.FromByteArray(envDataKEK));
envData = EnvelopedData.GetInstance(info.Content);
s = envData.RecipientInfos;
if (s.Count != 1)
{
return new SimpleTestResult(false, Name + ": CMS KEK enveloped, wrong number of recipients");
}
recip = RecipientInfo.GetInstance(s[0]);
if (recip.Info is KekRecipientInfo)
{
KekRecipientInfo inf = KekRecipientInfo.GetInstance(recip.Info);
inf = new KekRecipientInfo(inf.KekID, inf.KeyEncryptionAlgorithm, inf.EncryptedKey);
s = new DerSet(new RecipientInfo(inf));
}
else
{
return new SimpleTestResult(false, Name + ": CMS KEK enveloped, wrong recipient type");
}
envData = new EnvelopedData(envData.OriginatorInfo, s, envData.EncryptedContentInfo, envData.UnprotectedAttrs);
info = new ContentInfo(CmsObjectIdentifiers.EnvelopedData, envData);
if (!Arrays.AreEqual(info.GetEncoded(), envDataKEK))
{
return new SimpleTestResult(false, Name + ": CMS KEK enveloped failed to re-encode");
}
// Nested NDEF problem
Asn1StreamParser asn1In = new Asn1StreamParser(new MemoryStream(envDataNestedNDEF, false));
ContentInfoParser ci = new ContentInfoParser((Asn1SequenceParser)asn1In.ReadObject());
EnvelopedDataParser ed = new EnvelopedDataParser((Asn1SequenceParser)ci
.GetContent(Asn1Tags.Sequence));
Touch(ed.Version);
ed.GetOriginatorInfo();
ed.GetRecipientInfos().ToAsn1Object();
EncryptedContentInfoParser eci = ed.GetEncryptedContentInfo();
Touch(eci.ContentType);
Touch(eci.ContentEncryptionAlgorithm);
Stream dataIn = ((Asn1OctetStringParser)eci.GetEncryptedContent(Asn1Tags.OctetString))
.GetOctetStream();
Streams.Drain(dataIn);
dataIn.Close();
// Test data doesn't have unprotected attrs, bug was being thrown by this call
Asn1SetParser upa = ed.GetUnprotectedAttrs();
if (upa != null)
{
upa.ToAsn1Object();
}
return new SimpleTestResult(true, Name + ": Okay");
}
catch (Exception e)
{
return new SimpleTestResult(false, Name + ": CMS enveloped failed - " + e.ToString(), e);
}
}
public MimeEntity DecryptEntity(byte[] encryptedBytes, X509Certificate2 decryptingCertificate)
{
try
{
if (decryptingCertificate == null)
{
throw new EncryptionException(EncryptionError.NoCertificates);
}
// TODO: introduce buffering if you are using large files
// CMSEnvelopeData is a PKCS# structure rfc4134
var envelopedData = new CmsEnvelopedData(encryptedBytes);
var envData = EnvelopedData.GetInstance(envelopedData.ContentInfo.Content);
using (var session = GetSession())
{
if (session == null)
{
return(null);
}
foreach (Asn1Sequence asn1Set in envData.RecipientInfos)
{
var recip = RecipientInfo.GetInstance(asn1Set);
var keyTransRecipientInfo = KeyTransRecipientInfo.GetInstance(recip.Info);
var sessionKey = Pkcs11Util.Decrypt(session, keyTransRecipientInfo, decryptingCertificate);
#if DEBUG
Console.WriteLine(Asn1Dump.DumpAsString(envData));
#endif
if (sessionKey == null)
{
continue;
}
var recipientId = new RecipientID();
var issuerAndSerialNumber = (IssuerAndSerialNumber)keyTransRecipientInfo.RecipientIdentifier.ID;
recipientId.Issuer = issuerAndSerialNumber.Name;
recipientId.SerialNumber = issuerAndSerialNumber.SerialNumber.Value;
var recipientInformation = envelopedData.GetRecipientInfos().GetRecipients(recipientId);
var recipients = new ArrayList(recipientInformation);
//
// read the encrypted content info
//
var encInfo = envData.EncryptedContentInfo;
var encAlg = encInfo.ContentEncryptionAlgorithm;
var readable = new CmsProcessableByteArray(encInfo.EncryptedContent.GetOctets());
var keyParameter = ParameterUtilities.CreateKeyParameter(encAlg.Algorithm.Id, sessionKey);
// Todo: does this work with multi recipient?
foreach (RecipientInformation recipient in recipients)
{
var cmsReadable = GetReadable(keyParameter, encAlg, readable);
var cmsTypedStream = new CmsTypedStream(cmsReadable.GetInputStream());
var contentBytes = StreamToByteArray(cmsTypedStream.ContentStream);
var mimeEntity = MimeSerializer.Default.Deserialize <MimeEntity>(contentBytes);
return(mimeEntity);
}
}
}
}
catch (Exception ex)
{
Error.NotifyEvent(this, ex);
}
return(null);
}
